/*
 #
 #  File            : CImg.h
 #                    ( C++ header file )
 #
 #  Description     : The C++ Template Image Processing Toolkit.
 #                    This file is the main component of the CImg Library project.
 #                    ( http://cimg.sourceforge.net )
 #
 #  Project manager : David Tschumperle.
 #                    ( http://www.greyc.ensicaen.fr/~dtschump/ )
 #
 #                    The complete list of contributors is available in file 'README.txt'
 #                    distributed within the CImg package.
 #
 #  Licenses        : This file is 'dual-licensed', you have to choose one
 #                    of the two licenses below to apply.
 #
 #                    CeCILL-C
 #                    The CeCILL-C license is close to the GNU LGPL.
 #                    ( http://www.cecill.info/licences/Licence_CeCILL-C_V1-en.html )
 #
 #                or  CeCILL v2.0
 #                    The CeCILL license is compatible with the GNU GPL.
 #                    ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
 #
 #  This software is governed either by the CeCILL or the CeCILL-C license
 #  under French law and abiding by the rules of distribution of free software.
 #  You can  use, modify and or redistribute the software under the terms of
 #  the CeCILL or CeCILL-C licenses as circulated by CEA, CNRS and INRIA
 #  at the following URL : "http://www.cecill.info".
 #
 #  As a counterpart to the access to the source code and  rights to copy,
 #  modify and redistribute granted by the license, users are provided only
 #  with a limited warranty  and the software's author,  the holder of the
 #  economic rights,  and the successive licensors  have only  limited
 #  liability.
 #
 #  In this respect, the user's attention is drawn to the risks associated
 #  with loading,  using,  modifying and/or developing or reproducing the
 #  software by the user in light of its specific status of free software,
 #  that may mean  that it is complicated to manipulate,  and  that  also
 #  therefore means  that it is reserved for developers  and  experienced
 #  professionals having in-depth computer knowledge. Users are therefore
 #  encouraged to load and test the software's suitability as regards their
 #  requirements in conditions enabling the security of their systems and/or
 #  data to be ensured and,  more generally, to use and operate it in the
 #  same conditions as regards security.
 #
 #  The fact that you are presently reading this means that you have had
 #  knowledge of the CeCILL and CeCILL-C licenses and that you accept its terms.
 #
*/

// Define version number of the library file.
#ifndef cimg_version
#define cimg_version 148

/*-----------------------------------------------------------
 #
 # Test and auto-set CImg configuration variables
 # and include required headers.
 #
 # If you find that default configuration variables are
 # not adapted to your case, you can override their values
 # before including the header file "CImg.h"
 # (use the #define directive).
 #
 ------------------------------------------------------------*/

// Include required standard C++ headers.
#include <cstdio>
#include <cstdlib>
#include <cstdarg>
#include <cstring>
#include <cmath>
#include <ctime>
#include <exception>

// Operating system configuration.
//
// Define 'cimg_OS' to : '0' for an unknown OS (will try to minize library dependancies).
//                       '1' for a Unix-like OS (Linux, Solaris, BSD, MacOSX, Irix, ...).
//                       '2' for Microsoft Windows.
//                       (autodetection is done by default).
#ifndef cimg_OS
#if defined(unix)        || defined(__unix)      || defined(__unix__) \
 || defined(linux)       || defined(__linux)     || defined(__linux__) \
 || defined(sun)         || defined(__sun) \
 || defined(BSD)         || defined(__OpenBSD__) || defined(__NetBSD__) \
 || defined(__FreeBSD__) || defined __DragonFly__ \
 || defined(sgi)         || defined(__sgi) \
 || defined(__MACOSX__)  || defined(__APPLE__) \
 || defined(__CYGWIN__)
#define cimg_OS 1
#elif defined(_MSC_VER) || defined(WIN32)  || defined(_WIN32) || defined(__WIN32__) \
   || defined(WIN64)    || defined(_WIN64) || defined(__WIN64__)
#define cimg_OS 2
#else
#define cimg_OS 0
#endif
#elif !(cimg_OS==0 || cimg_OS==1 || cimg_OS==2)
#error CImg Library : Configuration variable 'cimg_OS' is badly defined.
#error (valid values are '0 = unknown OS', '1 = Unix-like OS', '2 = Microsoft Windows').
#endif

// Disable silly warnings on Microsoft VC++ compilers.
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4311)
#pragma warning(disable:4312)
#pragma warning(disable:4800)
#pragma warning(disable:4804)
#pragma warning(disable:4996)
#define _CRT_SECURE_NO_DEPRECATE 1
#define _CRT_NONSTDC_NO_DEPRECATE 1
#endif

// Include OS-specific headers for system management.
#if cimg_OS==1
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#elif cimg_OS==2
#include <windows.h>
#ifndef _WIN32_IE
#define _WIN32_IE 0x0400
#endif
#include <shlobj.h>
#include <io.h>
#define cimg_snprintf _snprintf
#define cimg_vsnprintf _vsnprintf
#endif
#ifndef cimg_snprintf
#include <stdio.h>
#define cimg_snprintf snprintf
#define cimg_vsnprintf vsnprintf
#endif

// Filename separator configuration.
//
// Default separator is '/' for Unix-based OS, and '\' or Windows.
#ifndef cimg_file_separator
#if cimg_OS==2
#define cimg_file_separator '\\'
#else
#define cimg_file_separator '/'
#endif
#endif

// Output messages verbosity configuration.
//
// Define 'cimg_verbosity' to : '0' to hide library messages (quiet mode).
//                              '1' to print library messages on the console.
//                              '2' to display library messages on a dialog window (default behavior).
//                              '3' to do as '1' + add extra warnings (may slow down the code !).
//                              '4' to do as '2' + add extra warnings (may slow down the code !).
//
// Define 'cimg_strict_warnings' to replace warning messages by exception throwns.
//
// Define 'cimg_use_vt100' to allow output of color messages (require VT100-compatible terminal).
#ifndef cimg_verbosity
#define cimg_verbosity 2
#elif !(cimg_verbosity==0 || cimg_verbosity==1 || cimg_verbosity==2 || cimg_verbosity==3 || cimg_verbosity==4)
#error CImg Library : Configuration variable 'cimg_verbosity' is badly defined.
#error (should be { 0=quiet | 1=console | 2=dialog | 3=console+warnings | 4=dialog+warnings }).
#endif

// Display framework configuration.
//
// Define 'cimg_display' to : '0' to disable display capabilities.
//                            '1' to use X-Window framework (X11).
//                            '2' to use Microsoft GDI32 framework.
#ifndef cimg_display
#if cimg_OS==0
#define cimg_display 0
#elif cimg_OS==1
#if defined(__MACOSX__) || defined(__APPLE__)
#define cimg_display 1
#else
#define cimg_display 1
#endif
#elif cimg_OS==2
#define cimg_display 2
#endif
#elif !(cimg_display==0 || cimg_display==1 || cimg_display==2)
#error CImg Library : Configuration variable 'cimg_display' is badly defined.
#error (should be { 0=none | 1=X-Window (X11) | 2=Microsoft GDI32 }).
#endif

// Include display-specific headers.
#if cimg_display==1
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>
#include <pthread.h>
#ifdef cimg_use_xshm
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
#endif
#ifdef cimg_use_xrandr
#include <X11/extensions/Xrandr.h>
#endif
#ifndef cimg_display_classname
#define cimg_display_classname "CImg"
#endif
#endif

// OpenMP configuration.
// (http://www.openmp.org)
//
// Define 'cimg_use_openmp' to enable OpenMP support.
//
// OpenMP directives can be used in few CImg functions to get
// advantages of multi-core CPUs. Using OpenMP is not mandatory.
#ifdef cimg_use_openmp
#include "omp.h"
#define _cimg_static
#else
#define _cimg_static static
#endif

// OpenCV configuration
// (http://opencv.willowgarage.com/wiki/)
//
// Define 'cimg_use_opencv' to enable OpenCV support.
//
// OpenCV can be used to retrieve images from cameras
// (with function 'CImg<T>::load_camera()'.
// Using OpenCV is not mandatory.
#ifdef cimg_use_opencv
#include "cv.h"
#include "highgui.h"
#endif

// LibPNG configuration.
// (http://www.libpng.org)
//
// Define 'cimg_use_png' to enable LibPNG support.
//
// LibPNG can be used in functions 'CImg<T>::{load,save}_png()'
// to get a builtin support of PNG files. Using LibPNG is not mandatory.
#ifdef cimg_use_png
extern "C" {
#include "png.h"
}
#endif

// LibJPEG configuration.
// (http://en.wikipedia.org/wiki/Libjpeg)
//
// Define 'cimg_use_jpeg' to enable LibJPEG support.
//
// LibJPEG can be used in functions 'CImg<T>::{load,save}_jpeg()'
// to get a builtin support of JPEG files. Using LibJPEG is not mandatory.
#ifdef cimg_use_jpeg
extern "C" {
#include "jpeglib.h"
#include "setjmp.h"
}
#endif

// LibTIFF configuration.
// (http://www.libtiff.org)
//
// Define 'cimg_use_tiff' to enable LibTIFF support.
//
// LibTIFF can be used in functions 'CImg[List]<T>::{load,save}_tiff()'
// to get a builtin support of TIFF files. Using LibTIFF is not mandatory.
#ifdef cimg_use_tiff
extern "C" {
#include "tiffio.h"
}
#endif

// LibMINC2 configuration.
// (http://en.wikibooks.org/wiki/MINC/Reference/MINC2.0_File_Format_Reference)
//
// Define 'cimg_use_minc2' to enable LibMINC2 support.
//
// LibMINC2 can be used in functions 'CImg<T>::{load,save}_minc2()'
// to get a builtin support of MINC2 files. Using LibMINC2 is not mandatory.
#ifdef cimg_use_minc2
extern "C" {
#include "minc2.h"
}
#endif

// FFMPEG Avcodec and Avformat libraries configuration.
// (http://www.ffmpeg.org)
//
// Define 'cimg_use_ffmpeg' to enable FFMPEG lib support.
//
// Avcodec and Avformat libraries can be used in functions
// 'CImg[List]<T>::load_ffmpeg()' to get a builtin
// support of various image sequences files.
// Using FFMPEG libraries is not mandatory.
#ifdef cimg_use_ffmpeg
#if (defined(_STDINT_H) || defined(_STDINT_H_)) && !defined(UINT64_C)
#warning "__STDC_CONSTANT_MACROS has to be defined before including <stdint.h>, this file will probably not compile."
#endif
#ifndef __STDC_CONSTANT_MACROS
#define __STDC_CONSTANT_MACROS // ...or stdint.h doesn't define UINT64_C, needed for libavutil
#endif
extern "C" {
#include "avformat.h"
#include "avcodec.h"
#include "swscale.h"
}
#endif

// Zlib configuration
// (http://www.zlib.net)
//
// Define 'cimg_use_zlib' to enable Zlib support.
//
// Zlib can be used in functions 'CImg[List]<T>::{load,save}_cimg()'
// to allow compressed data in '.cimg' files. Using Zlib is not mandatory.
#ifdef cimg_use_zlib
extern "C" {
#include "zlib.h"
}
#endif

// Magick++ configuration.
// (http://www.imagemagick.org/Magick++)
//
// Define 'cimg_use_magick' to enable Magick++ support.
//
// Magick++ library can be used in functions 'CImg<T>::{load,save}()'
// to get a builtin support of various image formats (PNG,JPEG,TIFF,...).
// Using Magick++ is not mandatory.
#ifdef cimg_use_magick
#include "Magick++.h"
#endif

// FFTW3 configuration.
// (http://www.fftw.org)
//
// Define 'cimg_use_fftw3' to enable libFFTW3 support.
//
// FFTW3 library can be used in functions 'CImg[List]<T>::FFT()' to
// efficiently compute the Fast Fourier Transform of image data.
#ifdef cimg_use_fftw3
extern "C" {
#include "fftw3.h"
}
#endif

// Board configuration
// (http://libboard.sourceforge.net/)
//
// Define 'cimg_use_board' to enable Board support.
//
// Board library can be used in functions 'CImg<T>::draw_object3d()'
// to draw objects 3d in vector-graphics canvas that can be saved
// as .PS or .SVG files afterwards.
#ifdef cimg_use_board
#ifdef None
#undef None
#define _cimg_redefine_None
#endif
#include "Board.h"
#endif

// OpenEXR configuration
// (http://www.openexr.com/)
//
// Define 'cimg_use_openexr' to enable OpenEXR support.
//
// OpenEXR can be used to read/write .exr file formats.
#ifdef cimg_use_openexr
#include "ImfRgbaFile.h"
#include "ImfInputFile.h"
#include "ImfChannelList.h"
#include "ImfMatrixAttribute.h"
#include "ImfArray.h"
#endif

// Lapack configuration.
// (http://www.netlib.org/lapack)
//
// Define 'cimg_use_lapack' to enable LAPACK support.
//
// Lapack can be used in various CImg functions dealing with
// matrix computation and algorithms (eigenvalues, inverse, ...).
// Using Lapack is not mandatory.
#ifdef cimg_use_lapack
extern "C" {
  extern void sgetrf_(int*, int*, float*, int*, int*, int*);
  extern void sgetri_(int*, float*, int*, int*, float*, int*, int*);
  extern void sgetrs_(char*, int*, int*, float*, int*, int*, float*, int*, int*);
  extern void sgesvd_(char*, char*, int*, int*, float*, int*, float*, float*, int*, float*, int*, float*, int*, int*);
  extern void ssyev_(char*, char*, int*, float*, int*, float*, float*, int*, int*);
  extern void dgetrf_(int*, int*, double*, int*, int*, int*);
  extern void dgetri_(int*, double*, int*, int*, double*, int*, int*);
  extern void dgetrs_(char*, int*, int*, double*, int*, int*, double*, int*, int*);
  extern void dgesvd_(char*, char*, int*, int*, double*, int*, double*, double*, int*, double*, int*, double*, int*, int*);
  extern void dsyev_(char*, char*, int*, double*, int*, double*, double*, int*, int*);
}
#endif

// Check if min/max/PI macros are defined.
//
// CImg does not compile if macros 'min', 'max' or 'PI' are defined,
// because min(), max() and PI labels are defined and used in the cimg:: namespace.
// so it '#undef' these macros if necessary, and restore them to reasonable
// values at the end of the file.
#ifdef min
#undef min
#define _cimg_redefine_min
#endif
#ifdef max
#undef max
#define _cimg_redefine_max
#endif
#ifdef PI
#undef PI
#define _cimg_redefine_PI
#endif

/*------------------------------------------------------------------------------
  #
  # Define user-friendly macros.
  #
  # User macros are prefixed by 'cimg_' and can be used in your own code.
  # They are particularly useful for option parsing, and image loops creation.
  #
  ------------------------------------------------------------------------------*/

// Define the program usage, and retrieve command line arguments.
#define cimg_usage(usage) cimg_library::cimg::option((char*)0,argc,argv,(char*)0,usage,false)
#define cimg_help(str) cimg_library::cimg::option((char*)0,argc,argv,str,(char*)0)
#define cimg_option(name,defaut,usage) cimg_library::cimg::option(name,argc,argv,defaut,usage)
#define cimg_argument(pos) cimg_library::cimg::argument(pos,argc,argv)
#define cimg_argument1(pos,s0) cimg_library::cimg::argument(pos,argc,argv,1,s0)
#define cimg_argument2(pos,s0,s1) cimg_library::cimg::argument(pos,argc,argv,2,s0,s1)
#define cimg_argument3(pos,s0,s1,s2) cimg_library::cimg::argument(pos,argc,argv,3,s0,s1,s2)
#define cimg_argument4(pos,s0,s1,s2,s3) cimg_library::cimg::argument(pos,argc,argv,4,s0,s1,s2,s3)
#define cimg_argument5(pos,s0,s1,s2,s3,s4) cimg_library::cimg::argument(pos,argc,argv,5,s0,s1,s2,s3,s4)
#define cimg_argument6(pos,s0,s1,s2,s3,s4,s5) cimg_library::cimg::argument(pos,argc,argv,6,s0,s1,s2,s3,s4,s5)
#define cimg_argument7(pos,s0,s1,s2,s3,s4,s5,s6) cimg_library::cimg::argument(pos,argc,argv,7,s0,s1,s2,s3,s4,s5,s6)
#define cimg_argument8(pos,s0,s1,s2,s3,s4,s5,s6,s7) cimg_library::cimg::argument(pos,argc,argv,8,s0,s1,s2,s3,s4,s5,s6,s7)
#define cimg_argument9(pos,s0,s1,s2,s3,s4,s5,s6,s7,s8) cimg_library::cimg::argument(pos,argc,argv,9,s0,s1,s2,s3,s4,s5,s6,s7,s8)

// Define and manipulate local neighborhoods.
#define CImg_2x2(I,T) T I[4]; \
                      T& I##cc = I[0]; T& I##nc = I[1]; \
                      T& I##cn = I[2]; T& I##nn = I[3]; \
                      I##cc = I##nc = \
                      I##cn = I##nn = 0

#define CImg_3x3(I,T) T I[9]; \
                      T& I##pp = I[0]; T& I##cp = I[1]; T& I##np = I[2]; \
                      T& I##pc = I[3]; T& I##cc = I[4]; T& I##nc = I[5]; \
                      T& I##pn = I[6]; T& I##cn = I[7]; T& I##nn = I[8]; \
                      I##pp = I##cp = I##np = \
                      I##pc = I##cc = I##nc = \
                      I##pn = I##cn = I##nn = 0

#define CImg_4x4(I,T) T I[16]; \
                      T& I##pp = I[0]; T& I##cp = I[1]; T& I##np = I[2]; T& I##ap = I[3]; \
                      T& I##pc = I[4]; T& I##cc = I[5]; T& I##nc = I[6]; T& I##ac = I[7]; \
                      T& I##pn = I[8]; T& I##cn = I[9]; T& I##nn = I[10]; T& I##an = I[11]; \
                      T& I##pa = I[12]; T& I##ca = I[13]; T& I##na = I[14]; T& I##aa = I[15]; \
                      I##pp = I##cp = I##np = I##ap = \
                      I##pc = I##cc = I##nc = I##ac = \
                      I##pn = I##cn = I##nn = I##an = \
                      I##pa = I##ca = I##na = I##aa = 0

#define CImg_5x5(I,T) T I[25]; \
                      T& I##bb = I[0]; T& I##pb = I[1]; T& I##cb = I[2]; T& I##nb = I[3]; T& I##ab = I[4]; \
                      T& I##bp = I[5]; T& I##pp = I[6]; T& I##cp = I[7]; T& I##np = I[8]; T& I##ap = I[9]; \
                      T& I##bc = I[10]; T& I##pc = I[11]; T& I##cc = I[12]; T& I##nc = I[13]; T& I##ac = I[14]; \
                      T& I##bn = I[15]; T& I##pn = I[16]; T& I##cn = I[17]; T& I##nn = I[18]; T& I##an = I[19]; \
                      T& I##ba = I[20]; T& I##pa = I[21]; T& I##ca = I[22]; T& I##na = I[23]; T& I##aa = I[24]; \
                      I##bb = I##pb = I##cb = I##nb = I##ab = \
                      I##bp = I##pp = I##cp = I##np = I##ap = \
                      I##bc = I##pc = I##cc = I##nc = I##ac = \
                      I##bn = I##pn = I##cn = I##nn = I##an = \
                      I##ba = I##pa = I##ca = I##na = I##aa = 0

#define CImg_2x2x2(I,T) T I[8]; \
                      T& I##ccc = I[0]; T& I##ncc = I[1]; \
                      T& I##cnc = I[2]; T& I##nnc = I[3]; \
                      T& I##ccn = I[4]; T& I##ncn = I[5]; \
                      T& I##cnn = I[6]; T& I##nnn = I[7]; \
                      I##ccc = I##ncc = \
                      I##cnc = I##nnc = \
                      I##ccn = I##ncn = \
                      I##cnn = I##nnn = 0

#define CImg_3x3x3(I,T) T I[27]; \
                      T& I##ppp = I[0]; T& I##cpp = I[1]; T& I##npp = I[2]; \
                      T& I##pcp = I[3]; T& I##ccp = I[4]; T& I##ncp = I[5]; \
                      T& I##pnp = I[6]; T& I##cnp = I[7]; T& I##nnp = I[8]; \
                      T& I##ppc = I[9]; T& I##cpc = I[10]; T& I##npc = I[11]; \
                      T& I##pcc = I[12]; T& I##ccc = I[13]; T& I##ncc = I[14]; \
                      T& I##pnc = I[15]; T& I##cnc = I[16]; T& I##nnc = I[17]; \
                      T& I##ppn = I[18]; T& I##cpn = I[19]; T& I##npn = I[20]; \
                      T& I##pcn = I[21]; T& I##ccn = I[22]; T& I##ncn = I[23]; \
                      T& I##pnn = I[24]; T& I##cnn = I[25]; T& I##nnn = I[26]; \
                      I##ppp = I##cpp = I##npp = \
                      I##pcp = I##ccp = I##ncp = \
                      I##pnp = I##cnp = I##nnp = \
                      I##ppc = I##cpc = I##npc = \
                      I##pcc = I##ccc = I##ncc = \
                      I##pnc = I##cnc = I##nnc = \
                      I##ppn = I##cpn = I##npn = \
                      I##pcn = I##ccn = I##ncn = \
                      I##pnn = I##cnn = I##nnn = 0

#define cimg_get2x2(img,x,y,z,c,I,T) \
  I[0] = (T)(img)(x,y,z,c), I[1] = (T)(img)(_n1##x,y,z,c), I[2] = (T)(img)(x,_n1##y,z,c), I[3] = (T)(img)(_n1##x,_n1##y,z,c)

#define cimg_get3x3(img,x,y,z,c,I,T) \
  I[0] = (T)(img)(_p1##x,_p1##y,z,c), I[1] = (T)(img)(x,_p1##y,z,c), I[2] = (T)(img)(_n1##x,_p1##y,z,c), I[3] = (T)(img)(_p1##x,y,z,c), \
  I[4] = (T)(img)(x,y,z,c), I[5] = (T)(img)(_n1##x,y,z,c), I[6] = (T)(img)(_p1##x,_n1##y,z,c), I[7] = (T)(img)(x,_n1##y,z,c), \
  I[8] = (T)(img)(_n1##x,_n1##y,z,c)

#define cimg_get4x4(img,x,y,z,c,I,T) \
  I[0] = (T)(img)(_p1##x,_p1##y,z,c), I[1] = (T)(img)(x,_p1##y,z,c), I[2] = (T)(img)(_n1##x,_p1##y,z,c), I[3] = (T)(img)(_n2##x,_p1##y,z,c), \
  I[4] = (T)(img)(_p1##x,y,z,c), I[5] = (T)(img)(x,y,z,c), I[6] = (T)(img)(_n1##x,y,z,c), I[7] = (T)(img)(_n2##x,y,z,c), \
  I[8] = (T)(img)(_p1##x,_n1##y,z,c), I[9] = (T)(img)(x,_n1##y,z,c), I[10] = (T)(img)(_n1##x,_n1##y,z,c), I[11] = (T)(img)(_n2##x,_n1##y,z,c), \
  I[12] = (T)(img)(_p1##x,_n2##y,z,c), I[13] = (T)(img)(x,_n2##y,z,c), I[14] = (T)(img)(_n1##x,_n2##y,z,c), I[15] = (T)(img)(_n2##x,_n2##y,z,c)

#define cimg_get5x5(img,x,y,z,c,I,T) \
  I[0] = (T)(img)(_p2##x,_p2##y,z,c), I[1] = (T)(img)(_p1##x,_p2##y,z,c), I[2] = (T)(img)(x,_p2##y,z,c), I[3] = (T)(img)(_n1##x,_p2##y,z,c), \
  I[4] = (T)(img)(_n2##x,_p2##y,z,c), I[5] = (T)(img)(_p2##x,_p1##y,z,c), I[6] = (T)(img)(_p1##x,_p1##y,z,c), I[7] = (T)(img)(x,_p1##y,z,c), \
  I[8] = (T)(img)(_n1##x,_p1##y,z,c), I[9] = (T)(img)(_n2##x,_p1##y,z,c), I[10] = (T)(img)(_p2##x,y,z,c), I[11] = (T)(img)(_p1##x,y,z,c), \
  I[12] = (T)(img)(x,y,z,c), I[13] = (T)(img)(_n1##x,y,z,c), I[14] = (T)(img)(_n2##x,y,z,c), I[15] = (T)(img)(_p2##x,_n1##y,z,c), \
  I[16] = (T)(img)(_p1##x,_n1##y,z,c), I[17] = (T)(img)(x,_n1##y,z,c), I[18] = (T)(img)(_n1##x,_n1##y,z,c), I[19] = (T)(img)(_n2##x,_n1##y,z,c), \
  I[20] = (T)(img)(_p2##x,_n2##y,z,c), I[21] = (T)(img)(_p1##x,_n2##y,z,c), I[22] = (T)(img)(x,_n2##y,z,c), I[23] = (T)(img)(_n1##x,_n2##y,z,c), \
  I[24] = (T)(img)(_n2##x,_n2##y,z,c)

#define cimg_get6x6(img,x,y,z,c,I,T) \
 I[0] = (T)(img)(_p2##x,_p2##y,z,c), I[1] = (T)(img)(_p1##x,_p2##y,z,c), I[2] = (T)(img)(x,_p2##y,z,c), I[3] = (T)(img)(_n1##x,_p2##y,z,c), \
 I[4] = (T)(img)(_n2##x,_p2##y,z,c), I[5] = (T)(img)(_n3##x,_p2##y,z,c), I[6] = (T)(img)(_p2##x,_p1##y,z,c), I[7] = (T)(img)(_p1##x,_p1##y,z,c), \
 I[8] = (T)(img)(x,_p1##y,z,c), I[9] = (T)(img)(_n1##x,_p1##y,z,c), I[10] = (T)(img)(_n2##x,_p1##y,z,c), I[11] = (T)(img)(_n3##x,_p1##y,z,c), \
 I[12] = (T)(img)(_p2##x,y,z,c), I[13] = (T)(img)(_p1##x,y,z,c), I[14] = (T)(img)(x,y,z,c), I[15] = (T)(img)(_n1##x,y,z,c), \
 I[16] = (T)(img)(_n2##x,y,z,c), I[17] = (T)(img)(_n3##x,y,z,c), I[18] = (T)(img)(_p2##x,_n1##y,z,c), I[19] = (T)(img)(_p1##x,_n1##y,z,c), \
 I[20] = (T)(img)(x,_n1##y,z,c), I[21] = (T)(img)(_n1##x,_n1##y,z,c), I[22] = (T)(img)(_n2##x,_n1##y,z,c), I[23] = (T)(img)(_n3##x,_n1##y,z,c), \
 I[24] = (T)(img)(_p2##x,_n2##y,z,c), I[25] = (T)(img)(_p1##x,_n2##y,z,c), I[26] = (T)(img)(x,_n2##y,z,c), I[27] = (T)(img)(_n1##x,_n2##y,z,c), \
 I[28] = (T)(img)(_n2##x,_n2##y,z,c), I[29] = (T)(img)(_n3##x,_n2##y,z,c), I[30] = (T)(img)(_p2##x,_n3##y,z,c), I[31] = (T)(img)(_p1##x,_n3##y,z,c), \
 I[32] = (T)(img)(x,_n3##y,z,c), I[33] = (T)(img)(_n1##x,_n3##y,z,c), I[34] = (T)(img)(_n2##x,_n3##y,z,c), I[35] = (T)(img)(_n3##x,_n3##y,z,c)

#define cimg_get7x7(img,x,y,z,c,I,T) \
 I[0] = (T)(img)(_p3##x,_p3##y,z,c), I[1] = (T)(img)(_p2##x,_p3##y,z,c), I[2] = (T)(img)(_p1##x,_p3##y,z,c), I[3] = (T)(img)(x,_p3##y,z,c), \
 I[4] = (T)(img)(_n1##x,_p3##y,z,c), I[5] = (T)(img)(_n2##x,_p3##y,z,c), I[6] = (T)(img)(_n3##x,_p3##y,z,c), I[7] = (T)(img)(_p3##x,_p2##y,z,c), \
 I[8] = (T)(img)(_p2##x,_p2##y,z,c), I[9] = (T)(img)(_p1##x,_p2##y,z,c), I[10] = (T)(img)(x,_p2##y,z,c), I[11] = (T)(img)(_n1##x,_p2##y,z,c), \
 I[12] = (T)(img)(_n2##x,_p2##y,z,c), I[13] = (T)(img)(_n3##x,_p2##y,z,c), I[14] = (T)(img)(_p3##x,_p1##y,z,c), I[15] = (T)(img)(_p2##x,_p1##y,z,c), \
 I[16] = (T)(img)(_p1##x,_p1##y,z,c), I[17] = (T)(img)(x,_p1##y,z,c), I[18] = (T)(img)(_n1##x,_p1##y,z,c), I[19] = (T)(img)(_n2##x,_p1##y,z,c), \
 I[20] = (T)(img)(_n3##x,_p1##y,z,c), I[21] = (T)(img)(_p3##x,y,z,c), I[22] = (T)(img)(_p2##x,y,z,c), I[23] = (T)(img)(_p1##x,y,z,c), \
 I[24] = (T)(img)(x,y,z,c), I[25] = (T)(img)(_n1##x,y,z,c), I[26] = (T)(img)(_n2##x,y,z,c), I[27] = (T)(img)(_n3##x,y,z,c), \
 I[28] = (T)(img)(_p3##x,_n1##y,z,c), I[29] = (T)(img)(_p2##x,_n1##y,z,c), I[30] = (T)(img)(_p1##x,_n1##y,z,c), I[31] = (T)(img)(x,_n1##y,z,c), \
 I[32] = (T)(img)(_n1##x,_n1##y,z,c), I[33] = (T)(img)(_n2##x,_n1##y,z,c), I[34] = (T)(img)(_n3##x,_n1##y,z,c), I[35] = (T)(img)(_p3##x,_n2##y,z,c), \
 I[36] = (T)(img)(_p2##x,_n2##y,z,c), I[37] = (T)(img)(_p1##x,_n2##y,z,c), I[38] = (T)(img)(x,_n2##y,z,c), I[39] = (T)(img)(_n1##x,_n2##y,z,c), \
 I[40] = (T)(img)(_n2##x,_n2##y,z,c), I[41] = (T)(img)(_n3##x,_n2##y,z,c), I[42] = (T)(img)(_p3##x,_n3##y,z,c), I[43] = (T)(img)(_p2##x,_n3##y,z,c), \
 I[44] = (T)(img)(_p1##x,_n3##y,z,c), I[45] = (T)(img)(x,_n3##y,z,c), I[46] = (T)(img)(_n1##x,_n3##y,z,c), I[47] = (T)(img)(_n2##x,_n3##y,z,c), \
 I[48] = (T)(img)(_n3##x,_n3##y,z,c)

#define cimg_get8x8(img,x,y,z,c,I,T) \
 I[0] = (T)(img)(_p3##x,_p3##y,z,c), I[1] = (T)(img)(_p2##x,_p3##y,z,c), I[2] = (T)(img)(_p1##x,_p3##y,z,c), I[3] = (T)(img)(x,_p3##y,z,c), \
 I[4] = (T)(img)(_n1##x,_p3##y,z,c), I[5] = (T)(img)(_n2##x,_p3##y,z,c), I[6] = (T)(img)(_n3##x,_p3##y,z,c), I[7] = (T)(img)(_n4##x,_p3##y,z,c), \
 I[8] = (T)(img)(_p3##x,_p2##y,z,c), I[9] = (T)(img)(_p2##x,_p2##y,z,c), I[10] = (T)(img)(_p1##x,_p2##y,z,c), I[11] = (T)(img)(x,_p2##y,z,c), \
 I[12] = (T)(img)(_n1##x,_p2##y,z,c), I[13] = (T)(img)(_n2##x,_p2##y,z,c), I[14] = (T)(img)(_n3##x,_p2##y,z,c), I[15] = (T)(img)(_n4##x,_p2##y,z,c), \
 I[16] = (T)(img)(_p3##x,_p1##y,z,c), I[17] = (T)(img)(_p2##x,_p1##y,z,c), I[18] = (T)(img)(_p1##x,_p1##y,z,c), I[19] = (T)(img)(x,_p1##y,z,c), \
 I[20] = (T)(img)(_n1##x,_p1##y,z,c), I[21] = (T)(img)(_n2##x,_p1##y,z,c), I[22] = (T)(img)(_n3##x,_p1##y,z,c), I[23] = (T)(img)(_n4##x,_p1##y,z,c), \
 I[24] = (T)(img)(_p3##x,y,z,c), I[25] = (T)(img)(_p2##x,y,z,c), I[26] = (T)(img)(_p1##x,y,z,c), I[27] = (T)(img)(x,y,z,c), \
 I[28] = (T)(img)(_n1##x,y,z,c), I[29] = (T)(img)(_n2##x,y,z,c), I[30] = (T)(img)(_n3##x,y,z,c), I[31] = (T)(img)(_n4##x,y,z,c), \
 I[32] = (T)(img)(_p3##x,_n1##y,z,c), I[33] = (T)(img)(_p2##x,_n1##y,z,c), I[34] = (T)(img)(_p1##x,_n1##y,z,c), I[35] = (T)(img)(x,_n1##y,z,c), \
 I[36] = (T)(img)(_n1##x,_n1##y,z,c), I[37] = (T)(img)(_n2##x,_n1##y,z,c), I[38] = (T)(img)(_n3##x,_n1##y,z,c), I[39] = (T)(img)(_n4##x,_n1##y,z,c), \
 I[40] = (T)(img)(_p3##x,_n2##y,z,c), I[41] = (T)(img)(_p2##x,_n2##y,z,c), I[42] = (T)(img)(_p1##x,_n2##y,z,c), I[43] = (T)(img)(x,_n2##y,z,c), \
 I[44] = (T)(img)(_n1##x,_n2##y,z,c), I[45] = (T)(img)(_n2##x,_n2##y,z,c), I[46] = (T)(img)(_n3##x,_n2##y,z,c), I[47] = (T)(img)(_n4##x,_n2##y,z,c), \
 I[48] = (T)(img)(_p3##x,_n3##y,z,c), I[49] = (T)(img)(_p2##x,_n3##y,z,c), I[50] = (T)(img)(_p1##x,_n3##y,z,c), I[51] = (T)(img)(x,_n3##y,z,c), \
 I[52] = (T)(img)(_n1##x,_n3##y,z,c), I[53] = (T)(img)(_n2##x,_n3##y,z,c), I[54] = (T)(img)(_n3##x,_n3##y,z,c), I[55] = (T)(img)(_n4##x,_n3##y,z,c), \
 I[56] = (T)(img)(_p3##x,_n4##y,z,c), I[57] = (T)(img)(_p2##x,_n4##y,z,c), I[58] = (T)(img)(_p1##x,_n4##y,z,c), I[59] = (T)(img)(x,_n4##y,z,c), \
 I[60] = (T)(img)(_n1##x,_n4##y,z,c), I[61] = (T)(img)(_n2##x,_n4##y,z,c), I[62] = (T)(img)(_n3##x,_n4##y,z,c), I[63] = (T)(img)(_n4##x,_n4##y,z,c);

#define cimg_get9x9(img,x,y,z,c,I,T) \
 I[0] = (T)(img)(_p4##x,_p4##y,z,c), I[1] = (T)(img)(_p3##x,_p4##y,z,c), I[2] = (T)(img)(_p2##x,_p4##y,z,c), I[3] = (T)(img)(_p1##x,_p4##y,z,c), \
 I[4] = (T)(img)(x,_p4##y,z,c), I[5] = (T)(img)(_n1##x,_p4##y,z,c), I[6] = (T)(img)(_n2##x,_p4##y,z,c), I[7] = (T)(img)(_n3##x,_p4##y,z,c), \
 I[8] = (T)(img)(_n4##x,_p4##y,z,c), I[9] = (T)(img)(_p4##x,_p3##y,z,c), I[10] = (T)(img)(_p3##x,_p3##y,z,c), I[11] = (T)(img)(_p2##x,_p3##y,z,c), \
 I[12] = (T)(img)(_p1##x,_p3##y,z,c), I[13] = (T)(img)(x,_p3##y,z,c), I[14] = (T)(img)(_n1##x,_p3##y,z,c), I[15] = (T)(img)(_n2##x,_p3##y,z,c), \
 I[16] = (T)(img)(_n3##x,_p3##y,z,c), I[17] = (T)(img)(_n4##x,_p3##y,z,c), I[18] = (T)(img)(_p4##x,_p2##y,z,c), I[19] = (T)(img)(_p3##x,_p2##y,z,c), \
 I[20] = (T)(img)(_p2##x,_p2##y,z,c), I[21] = (T)(img)(_p1##x,_p2##y,z,c), I[22] = (T)(img)(x,_p2##y,z,c), I[23] = (T)(img)(_n1##x,_p2##y,z,c), \
 I[24] = (T)(img)(_n2##x,_p2##y,z,c), I[25] = (T)(img)(_n3##x,_p2##y,z,c), I[26] = (T)(img)(_n4##x,_p2##y,z,c), I[27] = (T)(img)(_p4##x,_p1##y,z,c), \
 I[28] = (T)(img)(_p3##x,_p1##y,z,c), I[29] = (T)(img)(_p2##x,_p1##y,z,c), I[30] = (T)(img)(_p1##x,_p1##y,z,c), I[31] = (T)(img)(x,_p1##y,z,c), \
 I[32] = (T)(img)(_n1##x,_p1##y,z,c), I[33] = (T)(img)(_n2##x,_p1##y,z,c), I[34] = (T)(img)(_n3##x,_p1##y,z,c), I[35] = (T)(img)(_n4##x,_p1##y,z,c), \
 I[36] = (T)(img)(_p4##x,y,z,c), I[37] = (T)(img)(_p3##x,y,z,c), I[38] = (T)(img)(_p2##x,y,z,c), I[39] = (T)(img)(_p1##x,y,z,c), \
 I[40] = (T)(img)(x,y,z,c), I[41] = (T)(img)(_n1##x,y,z,c), I[42] = (T)(img)(_n2##x,y,z,c), I[43] = (T)(img)(_n3##x,y,z,c), \
 I[44] = (T)(img)(_n4##x,y,z,c), I[45] = (T)(img)(_p4##x,_n1##y,z,c), I[46] = (T)(img)(_p3##x,_n1##y,z,c), I[47] = (T)(img)(_p2##x,_n1##y,z,c), \
 I[48] = (T)(img)(_p1##x,_n1##y,z,c), I[49] = (T)(img)(x,_n1##y,z,c), I[50] = (T)(img)(_n1##x,_n1##y,z,c), I[51] = (T)(img)(_n2##x,_n1##y,z,c), \
 I[52] = (T)(img)(_n3##x,_n1##y,z,c), I[53] = (T)(img)(_n4##x,_n1##y,z,c), I[54] = (T)(img)(_p4##x,_n2##y,z,c), I[55] = (T)(img)(_p3##x,_n2##y,z,c), \
 I[56] = (T)(img)(_p2##x,_n2##y,z,c), I[57] = (T)(img)(_p1##x,_n2##y,z,c), I[58] = (T)(img)(x,_n2##y,z,c), I[59] = (T)(img)(_n1##x,_n2##y,z,c), \
 I[60] = (T)(img)(_n2##x,_n2##y,z,c), I[61] = (T)(img)(_n3##x,_n2##y,z,c), I[62] = (T)(img)(_n4##x,_n2##y,z,c), I[63] = (T)(img)(_p4##x,_n3##y,z,c), \
 I[64] = (T)(img)(_p3##x,_n3##y,z,c), I[65] = (T)(img)(_p2##x,_n3##y,z,c), I[66] = (T)(img)(_p1##x,_n3##y,z,c), I[67] = (T)(img)(x,_n3##y,z,c), \
 I[68] = (T)(img)(_n1##x,_n3##y,z,c), I[69] = (T)(img)(_n2##x,_n3##y,z,c), I[70] = (T)(img)(_n3##x,_n3##y,z,c), I[71] = (T)(img)(_n4##x,_n3##y,z,c), \
 I[72] = (T)(img)(_p4##x,_n4##y,z,c), I[73] = (T)(img)(_p3##x,_n4##y,z,c), I[74] = (T)(img)(_p2##x,_n4##y,z,c), I[75] = (T)(img)(_p1##x,_n4##y,z,c), \
 I[76] = (T)(img)(x,_n4##y,z,c), I[77] = (T)(img)(_n1##x,_n4##y,z,c), I[78] = (T)(img)(_n2##x,_n4##y,z,c), I[79] = (T)(img)(_n3##x,_n4##y,z,c), \
 I[80] = (T)(img)(_n4##x,_n4##y,z,c)

#define cimg_get2x2x2(img,x,y,z,c,I,T) \
  I[0] = (T)(img)(x,y,z,c), I[1] = (T)(img)(_n1##x,y,z,c), I[2] = (T)(img)(x,_n1##y,z,c), I[3] = (T)(img)(_n1##x,_n1##y,z,c), \
  I[4] = (T)(img)(x,y,_n1##z,c), I[5] = (T)(img)(_n1##x,y,_n1##z,c), I[6] = (T)(img)(x,_n1##y,_n1##z,c), I[7] = (T)(img)(_n1##x,_n1##y,_n1##z,c)

#define cimg_get3x3x3(img,x,y,z,c,I,T) \
  I[0] = (T)(img)(_p1##x,_p1##y,_p1##z,c), I[1] = (T)(img)(x,_p1##y,_p1##z,c), I[2] = (T)(img)(_n1##x,_p1##y,_p1##z,c), \
  I[3] = (T)(img)(_p1##x,y,_p1##z,c), I[4] = (T)(img)(x,y,_p1##z,c), I[5] = (T)(img)(_n1##x,y,_p1##z,c), \
  I[6] = (T)(img)(_p1##x,_n1##y,_p1##z,c), I[7] = (T)(img)(x,_n1##y,_p1##z,c), I[8] = (T)(img)(_n1##x,_n1##y,_p1##z,c), \
  I[9] = (T)(img)(_p1##x,_p1##y,z,c), I[10] = (T)(img)(x,_p1##y,z,c), I[11] = (T)(img)(_n1##x,_p1##y,z,c), \
  I[12] = (T)(img)(_p1##x,y,z,c), I[13] = (T)(img)(x,y,z,c), I[14] = (T)(img)(_n1##x,y,z,c), \
  I[15] = (T)(img)(_p1##x,_n1##y,z,c), I[16] = (T)(img)(x,_n1##y,z,c), I[17] = (T)(img)(_n1##x,_n1##y,z,c), \
  I[18] = (T)(img)(_p1##x,_p1##y,_n1##z,c), I[19] = (T)(img)(x,_p1##y,_n1##z,c), I[20] = (T)(img)(_n1##x,_p1##y,_n1##z,c), \
  I[21] = (T)(img)(_p1##x,y,_n1##z,c), I[22] = (T)(img)(x,y,_n1##z,c), I[23] = (T)(img)(_n1##x,y,_n1##z,c), \
  I[24] = (T)(img)(_p1##x,_n1##y,_n1##z,c), I[25] = (T)(img)(x,_n1##y,_n1##z,c), I[26] = (T)(img)(_n1##x,_n1##y,_n1##z,c)

// Define various image loops.
//
// These macros generally avoid the use of iterators, but you are not forced to used them !
#define cimg_for(img,ptrs,T_ptrs) for (T_ptrs *ptrs = (img)._data + (img).size(); (ptrs--)>(img)._data; )
#define cimg_foroff(img,off) for (unsigned int off = 0, _max##off = (unsigned int)(img).size(); off<_max##off; ++off)

#define cimg_for1(bound,i) for (int i = 0; i<(int)(bound); ++i)
#define cimg_forX(img,x) cimg_for1((img)._width,x)
#define cimg_forY(img,y) cimg_for1((img)._height,y)
#define cimg_forZ(img,z) cimg_for1((img)._depth,z)
#define cimg_forC(img,c) cimg_for1((img)._spectrum,c)
#define cimg_forXY(img,x,y) cimg_forY(img,y) cimg_forX(img,x)
#define cimg_forXZ(img,x,z) cimg_forZ(img,z) cimg_forX(img,x)
#define cimg_forYZ(img,y,z) cimg_forZ(img,z) cimg_forY(img,y)
#define cimg_forXC(img,x,c) cimg_forC(img,c) cimg_forX(img,x)
#define cimg_forYC(img,y,c) cimg_forC(img,c) cimg_forY(img,y)
#define cimg_forZC(img,z,c) cimg_forC(img,c) cimg_forZ(img,z)
#define cimg_forXYZ(img,x,y,z) cimg_forZ(img,z) cimg_forXY(img,x,y)
#define cimg_forXYC(img,x,y,c) cimg_forC(img,c) cimg_forXY(img,x,y)
#define cimg_forXZC(img,x,z,c) cimg_forC(img,c) cimg_forXZ(img,x,z)
#define cimg_forYZC(img,y,z,c) cimg_forC(img,c) cimg_forYZ(img,y,z)
#define cimg_forXYZC(img,x,y,z,c) cimg_forC(img,c) cimg_forXYZ(img,x,y,z)

#define cimg_for_in1(bound,i0,i1,i) \
 for (int i = (int)(i0)<0?0:(int)(i0), _max##i = (int)(i1)<(int)(bound)?(int)(i1):(int)(bound)-1; i<=_max##i; ++i)
#define cimg_for_inX(img,x0,x1,x) cimg_for_in1((img)._width,x0,x1,x)
#define cimg_for_inY(img,y0,y1,y) cimg_for_in1((img)._height,y0,y1,y)
#define cimg_for_inZ(img,z0,z1,z) cimg_for_in1((img)._depth,z0,z1,z)
#define cimg_for_inC(img,c0,c1,c) cimg_for_in1((img)._spectrum,c0,c1,c)
#define cimg_for_inXY(img,x0,y0,x1,y1,x,y) cimg_for_inY(img,y0,y1,y) cimg_for_inX(img,x0,x1,x)
#define cimg_for_inXZ(img,x0,z0,x1,z1,x,z) cimg_for_inZ(img,z0,z1,z) cimg_for_inX(img,x0,x1,x)
#define cimg_for_inXC(img,x0,c0,x1,c1,x,c) cimg_for_inC(img,c0,c1,c) cimg_for_inX(img,x0,x1,x)
#define cimg_for_inYZ(img,y0,z0,y1,z1,y,z) cimg_for_inZ(img,x0,z1,z) cimg_for_inY(img,y0,y1,y)
#define cimg_for_inYC(img,y0,c0,y1,c1,y,c) cimg_for_inC(img,c0,c1,c) cimg_for_inY(img,y0,y1,y)
#define cimg_for_inZC(img,z0,c0,z1,c1,z,c) cimg_for_inC(img,c0,c1,c) cimg_for_inZ(img,z0,z1,z)
#define cimg_for_inXYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_inZ(img,z0,z1,z) cimg_for_inXY(img,x0,y0,x1,y1,x,y)
#define cimg_for_inXYC(img,x0,y0,c0,x1,y1,c1,x,y,c) cimg_for_inC(img,c0,c1,c) cimg_for_inXY(img,x0,y0,x1,y1,x,y)
#define cimg_for_inXZC(img,x0,z0,c0,x1,z1,c1,x,z,c) cimg_for_inC(img,c0,c1,c) cimg_for_inXZ(img,x0,z0,x1,z1,x,z)
#define cimg_for_inYZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_inC(img,c0,c1,c) cimg_for_inYZ(img,y0,z0,y1,z1,y,z)
#define cimg_for_inXYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) cimg_for_inC(img,c0,c1,c) cimg_for_inXYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)
#define cimg_for_insideX(img,x,n) cimg_for_inX(img,n,(img)._width-1-(n),x)
#define cimg_for_insideY(img,y,n) cimg_for_inY(img,n,(img)._height-1-(n),y)
#define cimg_for_insideZ(img,z,n) cimg_for_inZ(img,n,(img)._depth-1-(n),z)
#define cimg_for_insideC(img,c,n) cimg_for_inC(img,n,(img)._spectrum-1-(n),c)
#define cimg_for_insideXY(img,x,y,n) cimg_for_inXY(img,n,n,(img)._width-1-(n),(img)._height-1-(n),x,y)
#define cimg_for_insideXYZ(img,x,y,z,n) cimg_for_inXYZ(img,n,n,n,(img)._width-1-(n),(img)._height-1-(n),(img)._depth-1-(n),x,y,z)
#define cimg_for_insideXYZC(img,x,y,z,c,n) cimg_for_inXYZ(img,n,n,n,(img)._width-1-(n),(img)._height-1-(n),(img)._depth-1-(n),x,y,z)

#define cimg_for_out1(boundi,i0,i1,i) \
 for (int i = (int)(i0)>0?0:(int)(i1)+1; i<(int)(boundi); ++i, i = i==(int)(i0)?(int)(i1)+1:i)
#define cimg_for_out2(boundi,boundj,i0,j0,i1,j1,i,j) \
 for (int j = 0; j<(int)(boundj); ++j) \
 for (int _n1j = (int)(j<(int)(j0) || j>(int)(j1)), i = _n1j?0:(int)(i0)>0?0:(int)(i1)+1; i<(int)(boundi); \
  ++i, i = _n1j?i:(i==(int)(i0)?(int)(i1)+1:i))
#define cimg_for_out3(boundi,boundj,boundk,i0,j0,k0,i1,j1,k1,i,j,k) \
 for (int k = 0; k<(int)(boundk); ++k) \
 for (int _n1k = (int)(k<(int)(k0) || k>(int)(k1)), j = 0; j<(int)(boundj); ++j) \
 for (int _n1j = (int)(j<(int)(j0) || j>(int)(j1)), i = _n1j || _n1k?0:(int)(i0)>0?0:(int)(i1)+1; i<(int)(boundi); \
  ++i, i = _n1j || _n1k?i:(i==(int)(i0)?(int)(i1)+1:i))
#define cimg_for_out4(boundi,boundj,boundk,boundl,i0,j0,k0,l0,i1,j1,k1,l1,i,j,k,l) \
 for (int l = 0; l<(int)(boundl); ++l) \
 for (int _n1l = (int)(l<(int)(l0) || l>(int)(l1)), k = 0; k<(int)(boundk); ++k) \
 for (int _n1k = (int)(k<(int)(k0) || k>(int)(k1)), j = 0; j<(int)(boundj); ++j) \
 for (int _n1j = (int)(j<(int)(j0) || j>(int)(j1)), i = _n1j || _n1k || _n1l?0:(int)(i0)>0?0:(int)(i1)+1; i<(int)(boundi); \
  ++i, i = _n1j || _n1k || _n1l?i:(i==(int)(i0)?(int)(i1)+1:i))
#define cimg_for_outX(img,x0,x1,x) cimg_for_out1((img)._width,x0,x1,x)
#define cimg_for_outY(img,y0,y1,y) cimg_for_out1((img)._height,y0,y1,y)
#define cimg_for_outZ(img,z0,z1,z) cimg_for_out1((img)._depth,z0,z1,z)
#define cimg_for_outC(img,c0,c1,c) cimg_for_out1((img)._spectrum,c0,c1,c)
#define cimg_for_outXY(img,x0,y0,x1,y1,x,y) cimg_for_out2((img)._width,(img)._height,x0,y0,x1,y1,x,y)
#define cimg_for_outXZ(img,x0,z0,x1,z1,x,z) cimg_for_out2((img)._width,(img)._depth,x0,z0,x1,z1,x,z)
#define cimg_for_outXC(img,x0,c0,x1,c1,x,c) cimg_for_out2((img)._width,(img)._spectrum,x0,c0,x1,c1,x,c)
#define cimg_for_outYZ(img,y0,z0,y1,z1,y,z) cimg_for_out2((img)._height,(img)._depth,y0,z0,y1,z1,y,z)
#define cimg_for_outYC(img,y0,c0,y1,c1,y,c) cimg_for_out2((img)._height,(img)._spectrum,y0,c0,y1,c1,y,c)
#define cimg_for_outZC(img,z0,c0,z1,c1,z,c) cimg_for_out2((img)._depth,(img)._spectrum,z0,c0,z1,c1,z,c)
#define cimg_for_outXYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_out3((img)._width,(img)._height,(img)._depth,x0,y0,z0,x1,y1,z1,x,y,z)
#define cimg_for_outXYC(img,x0,y0,c0,x1,y1,c1,x,y,c) cimg_for_out3((img)._width,(img)._height,(img)._spectrum,x0,y0,c0,x1,y1,c1,x,y,c)
#define cimg_for_outXZC(img,x0,z0,c0,x1,z1,c1,x,z,c) cimg_for_out3((img)._width,(img)._depth,(img)._spectrum,x0,z0,c0,x1,z1,c1,x,z,c)
#define cimg_for_outYZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_out3((img)._height,(img)._depth,(img)._spectrum,y0,z0,c0,y1,z1,c1,y,z,c)
#define cimg_for_outXYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) \
 cimg_for_out4((img)._width,(img)._height,(img)._depth,(img)._spectrum,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c)
#define cimg_for_borderX(img,x,n) cimg_for_outX(img,n,(img)._width-1-(n),x)
#define cimg_for_borderY(img,y,n) cimg_for_outY(img,n,(img)._height-1-(n),y)
#define cimg_for_borderZ(img,z,n) cimg_for_outZ(img,n,(img)._depth-1-(n),z)
#define cimg_for_borderC(img,c,n) cimg_for_outC(img,n,(img)._spectrum-1-(n),c)
#define cimg_for_borderXY(img,x,y,n) cimg_for_outXY(img,n,n,(img)._width-1-(n),(img)._height-1-(n),x,y)
#define cimg_for_borderXYZ(img,x,y,z,n) cimg_for_outXYZ(img,n,n,n,(img)._width-1-(n),(img)._height-1-(n),(img)._depth-1-(n),x,y,z)
#define cimg_for_borderXYZC(img,x,y,z,c,n) \
 cimg_for_outXYZC(img,n,n,n,n,(img)._width-1-(n),(img)._height-1-(n),(img)._depth-1-(n),(img)._spectrum-1-(n),x,y,z,c)

#define cimg_for_spiralXY(img,x,y) \
 for (int x = 0, y = 0, _n1##x = 1, _n1##y = (img).width()*(img).height(); _n1##y; \
      --_n1##y, _n1##x+=(_n1##x>>2)-((!(_n1##x&3)?--y:((_n1##x&3)==1?(img)._width-1-++x:((_n1##x&3)==2?(img)._height-1-++y:--x))))?0:1)

#define cimg_for_lineXY(x,y,x0,y0,x1,y1) \
 for (int x = (int)(x0), y = (int)(y0), _sx = 1, _sy = 1, _steep = 0, \
      _dx=(x1)>(x0)?(int)(x1)-(int)(x0):(_sx=-1,(int)(x0)-(int)(x1)), \
      _dy=(y1)>(y0)?(int)(y1)-(int)(y0):(_sy=-1,(int)(y0)-(int)(y1)), \
      _counter = _dx, \
      _err = _dx>_dy?(_dy>>1):((_steep=1),(_counter=_dy),(_dx>>1)); \
      _counter>=0; \
      --_counter, x+=_steep? \
      (y+=_sy,(_err-=_dx)<0?_err+=_dy,_sx:0): \
      (y+=(_err-=_dy)<0?_err+=_dx,_sy:0,_sx))

#define cimg_for2(bound,i) \
 for (int i = 0, _n1##i = 1>=(bound)?(int)(bound)-1:1; \
      _n1##i<(int)(bound) || i==--_n1##i; \
      ++i, ++_n1##i)
#define cimg_for2X(img,x) cimg_for2((img)._width,x)
#define cimg_for2Y(img,y) cimg_for2((img)._height,y)
#define cimg_for2Z(img,z) cimg_for2((img)._depth,z)
#define cimg_for2C(img,c) cimg_for2((img)._spectrum,c)
#define cimg_for2XY(img,x,y) cimg_for2Y(img,y) cimg_for2X(img,x)
#define cimg_for2XZ(img,x,z) cimg_for2Z(img,z) cimg_for2X(img,x)
#define cimg_for2XC(img,x,c) cimg_for2C(img,c) cimg_for2X(img,x)
#define cimg_for2YZ(img,y,z) cimg_for2Z(img,z) cimg_for2Y(img,y)
#define cimg_for2YC(img,y,c) cimg_for2C(img,c) cimg_for2Y(img,y)
#define cimg_for2ZC(img,z,c) cimg_for2C(img,c) cimg_for2Z(img,z)
#define cimg_for2XYZ(img,x,y,z) cimg_for2Z(img,z) cimg_for2XY(img,x,y)
#define cimg_for2XZC(img,x,z,c) cimg_for2C(img,c) cimg_for2XZ(img,x,z)
#define cimg_for2YZC(img,y,z,c) cimg_for2C(img,c) cimg_for2YZ(img,y,z)
#define cimg_for2XYZC(img,x,y,z,c) cimg_for2C(img,c) cimg_for2XYZ(img,x,y,z)

#define cimg_for_in2(bound,i0,i1,i) \
 for (int i = (int)(i0)<0?0:(int)(i0), \
      _n1##i = i+1>=(int)(bound)?(int)(bound)-1:i+1; \
      i<=(int)(i1) && (_n1##i<(int)(bound) || i==--_n1##i); \
      ++i, ++_n1##i)
#define cimg_for_in2X(img,x0,x1,x) cimg_for_in2((img)._width,x0,x1,x)
#define cimg_for_in2Y(img,y0,y1,y) cimg_for_in2((img)._height,y0,y1,y)
#define cimg_for_in2Z(img,z0,z1,z) cimg_for_in2((img)._depth,z0,z1,z)
#define cimg_for_in2C(img,c0,c1,c) cimg_for_in2((img)._spectrum,c0,c1,c)
#define cimg_for_in2XY(img,x0,y0,x1,y1,x,y) cimg_for_in2Y(img,y0,y1,y) cimg_for_in2X(img,x0,x1,x)
#define cimg_for_in2XZ(img,x0,z0,x1,z1,x,z) cimg_for_in2Z(img,z0,z1,z) cimg_for_in2X(img,x0,x1,x)
#define cimg_for_in2XC(img,x0,c0,x1,c1,x,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2X(img,x0,x1,x)
#define cimg_for_in2YZ(img,y0,z0,y1,z1,y,z) cimg_for_in2Z(img,z0,z1,z) cimg_for_in2Y(img,y0,y1,y)
#define cimg_for_in2YC(img,y0,c0,y1,c1,y,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2Y(img,y0,y1,y)
#define cimg_for_in2ZC(img,z0,c0,z1,c1,z,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2Z(img,z0,z1,z)
#define cimg_for_in2XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in2Z(img,z0,z1,z) cimg_for_in2XY(img,x0,y0,x1,y1,x,y)
#define cimg_for_in2XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2XZ(img,x0,y0,x1,y1,x,z)
#define cimg_for_in2YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2YZ(img,y0,z0,y1,z1,y,z)
#define cimg_for_in2XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) cimg_for_in2C(img,c0,c1,c) cimg_for_in2XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)

#define cimg_for3(bound,i) \
 for (int i = 0, _p1##i = 0, \
      _n1##i = 1>=(bound)?(int)(bound)-1:1; \
      _n1##i<(int)(bound) || i==--_n1##i; \
      _p1##i = i++, ++_n1##i)
#define cimg_for3X(img,x) cimg_for3((img)._width,x)
#define cimg_for3Y(img,y) cimg_for3((img)._height,y)
#define cimg_for3Z(img,z) cimg_for3((img)._depth,z)
#define cimg_for3C(img,c) cimg_for3((img)._spectrum,c)
#define cimg_for3XY(img,x,y) cimg_for3Y(img,y) cimg_for3X(img,x)
#define cimg_for3XZ(img,x,z) cimg_for3Z(img,z) cimg_for3X(img,x)
#define cimg_for3XC(img,x,c) cimg_for3C(img,c) cimg_for3X(img,x)
#define cimg_for3YZ(img,y,z) cimg_for3Z(img,z) cimg_for3Y(img,y)
#define cimg_for3YC(img,y,c) cimg_for3C(img,c) cimg_for3Y(img,y)
#define cimg_for3ZC(img,z,c) cimg_for3C(img,c) cimg_for3Z(img,z)
#define cimg_for3XYZ(img,x,y,z) cimg_for3Z(img,z) cimg_for3XY(img,x,y)
#define cimg_for3XZC(img,x,z,c) cimg_for3C(img,c) cimg_for3XZ(img,x,z)
#define cimg_for3YZC(img,y,z,c) cimg_for3C(img,c) cimg_for3YZ(img,y,z)
#define cimg_for3XYZC(img,x,y,z,c) cimg_for3C(img,c) cimg_for3XYZ(img,x,y,z)

#define cimg_for_in3(bound,i0,i1,i) \
 for (int i = (int)(i0)<0?0:(int)(i0), \
      _p1##i = i-1<0?0:i-1, \
      _n1##i = i+1>=(int)(bound)?(int)(bound)-1:i+1; \
      i<=(int)(i1) && (_n1##i<(int)(bound) || i==--_n1##i); \
      _p1##i = i++, ++_n1##i)
#define cimg_for_in3X(img,x0,x1,x) cimg_for_in3((img)._width,x0,x1,x)
#define cimg_for_in3Y(img,y0,y1,y) cimg_for_in3((img)._height,y0,y1,y)
#define cimg_for_in3Z(img,z0,z1,z) cimg_for_in3((img)._depth,z0,z1,z)
#define cimg_for_in3C(img,c0,c1,c) cimg_for_in3((img)._spectrum,c0,c1,c)
#define cimg_for_in3XY(img,x0,y0,x1,y1,x,y) cimg_for_in3Y(img,y0,y1,y) cimg_for_in3X(img,x0,x1,x)
#define cimg_for_in3XZ(img,x0,z0,x1,z1,x,z) cimg_for_in3Z(img,z0,z1,z) cimg_for_in3X(img,x0,x1,x)
#define cimg_for_in3XC(img,x0,c0,x1,c1,x,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3X(img,x0,x1,x)
#define cimg_for_in3YZ(img,y0,z0,y1,z1,y,z) cimg_for_in3Z(img,z0,z1,z) cimg_for_in3Y(img,y0,y1,y)
#define cimg_for_in3YC(img,y0,c0,y1,c1,y,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3Y(img,y0,y1,y)
#define cimg_for_in3ZC(img,z0,c0,z1,c1,z,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3Z(img,z0,z1,z)
#define cimg_for_in3XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in3Z(img,z0,z1,z) cimg_for_in3XY(img,x0,y0,x1,y1,x,y)
#define cimg_for_in3XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3XZ(img,x0,y0,x1,y1,x,z)
#define cimg_for_in3YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3YZ(img,y0,z0,y1,z1,y,z)
#define cimg_for_in3XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) cimg_for_in3C(img,c0,c1,c) cimg_for_in3XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)

#define cimg_for4(bound,i) \
 for (int i = 0, _p1##i = 0, _n1##i = 1>=(bound)?(int)(bound)-1:1, \
      _n2##i = 2>=(bound)?(int)(bound)-1:2; \
      _n2##i<(int)(bound) || _n1##i==--_n2##i || i==(_n2##i = --_n1##i); \
      _p1##i = i++, ++_n1##i, ++_n2##i)
#define cimg_for4X(img,x) cimg_for4((img)._width,x)
#define cimg_for4Y(img,y) cimg_for4((img)._height,y)
#define cimg_for4Z(img,z) cimg_for4((img)._depth,z)
#define cimg_for4C(img,c) cimg_for4((img)._spectrum,c)
#define cimg_for4XY(img,x,y) cimg_for4Y(img,y) cimg_for4X(img,x)
#define cimg_for4XZ(img,x,z) cimg_for4Z(img,z) cimg_for4X(img,x)
#define cimg_for4XC(img,x,c) cimg_for4C(img,c) cimg_for4X(img,x)
#define cimg_for4YZ(img,y,z) cimg_for4Z(img,z) cimg_for4Y(img,y)
#define cimg_for4YC(img,y,c) cimg_for4C(img,c) cimg_for4Y(img,y)
#define cimg_for4ZC(img,z,c) cimg_for4C(img,c) cimg_for4Z(img,z)
#define cimg_for4XYZ(img,x,y,z) cimg_for4Z(img,z) cimg_for4XY(img,x,y)
#define cimg_for4XZC(img,x,z,c) cimg_for4C(img,c) cimg_for4XZ(img,x,z)
#define cimg_for4YZC(img,y,z,c) cimg_for4C(img,c) cimg_for4YZ(img,y,z)
#define cimg_for4XYZC(img,x,y,z,c) cimg_for4C(img,c) cimg_for4XYZ(img,x,y,z)

#define cimg_for_in4(bound,i0,i1,i) \
 for (int i = (int)(i0)<0?0:(int)(i0), \
      _p1##i = i-1<0?0:i-1, \
      _n1##i = i+1>=(int)(bound)?(int)(bound)-1:i+1, \
      _n2##i = i+2>=(int)(bound)?(int)(bound)-1:i+2; \
      i<=(int)(i1) && (_n2##i<(int)(bound) || _n1##i==--_n2##i || i==(_n2##i = --_n1##i)); \
      _p1##i = i++, ++_n1##i, ++_n2##i)
#define cimg_for_in4X(img,x0,x1,x) cimg_for_in4((img)._width,x0,x1,x)
#define cimg_for_in4Y(img,y0,y1,y) cimg_for_in4((img)._height,y0,y1,y)
#define cimg_for_in4Z(img,z0,z1,z) cimg_for_in4((img)._depth,z0,z1,z)
#define cimg_for_in4C(img,c0,c1,c) cimg_for_in4((img)._spectrum,c0,c1,c)
#define cimg_for_in4XY(img,x0,y0,x1,y1,x,y) cimg_for_in4Y(img,y0,y1,y) cimg_for_in4X(img,x0,x1,x)
#define cimg_for_in4XZ(img,x0,z0,x1,z1,x,z) cimg_for_in4Z(img,z0,z1,z) cimg_for_in4X(img,x0,x1,x)
#define cimg_for_in4XC(img,x0,c0,x1,c1,x,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4X(img,x0,x1,x)
#define cimg_for_in4YZ(img,y0,z0,y1,z1,y,z) cimg_for_in4Z(img,z0,z1,z) cimg_for_in4Y(img,y0,y1,y)
#define cimg_for_in4YC(img,y0,c0,y1,c1,y,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4Y(img,y0,y1,y)
#define cimg_for_in4ZC(img,z0,c0,z1,c1,z,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4Z(img,z0,z1,z)
#define cimg_for_in4XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in4Z(img,z0,z1,z) cimg_for_in4XY(img,x0,y0,x1,y1,x,y)
#define cimg_for_in4XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4XZ(img,x0,y0,x1,y1,x,z)
#define cimg_for_in4YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4YZ(img,y0,z0,y1,z1,y,z)
#define cimg_for_in4XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) cimg_for_in4C(img,c0,c1,c) cimg_for_in4XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)

#define cimg_for5(bound,i) \
 for (int i = 0, _p2##i = 0, _p1##i = 0, \
      _n1##i = 1>=(bound)?(int)(bound)-1:1, \
      _n2##i = 2>=(bound)?(int)(bound)-1:2; \
      _n2##i<(int)(bound) || _n1##i==--_n2##i || i==(_n2##i = --_n1##i); \
      _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i)
#define cimg_for5X(img,x) cimg_for5((img)._width,x)
#define cimg_for5Y(img,y) cimg_for5((img)._height,y)
#define cimg_for5Z(img,z) cimg_for5((img)._depth,z)
#define cimg_for5C(img,c) cimg_for5((img)._spectrum,c)
#define cimg_for5XY(img,x,y) cimg_for5Y(img,y) cimg_for5X(img,x)
#define cimg_for5XZ(img,x,z) cimg_for5Z(img,z) cimg_for5X(img,x)
#define cimg_for5XC(img,x,c) cimg_for5C(img,c) cimg_for5X(img,x)
#define cimg_for5YZ(img,y,z) cimg_for5Z(img,z) cimg_for5Y(img,y)
#define cimg_for5YC(img,y,c) cimg_for5C(img,c) cimg_for5Y(img,y)
#define cimg_for5ZC(img,z,c) cimg_for5C(img,c) cimg_for5Z(img,z)
#define cimg_for5XYZ(img,x,y,z) cimg_for5Z(img,z) cimg_for5XY(img,x,y)
#define cimg_for5XZC(img,x,z,c) cimg_for5C(img,c) cimg_for5XZ(img,x,z)
#define cimg_for5YZC(img,y,z,c) cimg_for5C(img,c) cimg_for5YZ(img,y,z)
#define cimg_for5XYZC(img,x,y,z,c) cimg_for5C(img,c) cimg_for5XYZ(img,x,y,z)

#define cimg_for_in5(bound,i0,i1,i) \
 for (int i = (int)(i0)<0?0:(int)(i0), \
      _p2##i = i-2<0?0:i-2, \
      _p1##i = i-1<0?0:i-1, \
      _n1##i = i+1>=(int)(bound)?(int)(bound)-1:i+1, \
      _n2##i = i+2>=(int)(bound)?(int)(bound)-1:i+2; \
      i<=(int)(i1) && (_n2##i<(int)(bound) || _n1##i==--_n2##i || i==(_n2##i = --_n1##i)); \
      _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i)
#define cimg_for_in5X(img,x0,x1,x) cimg_for_in5((img)._width,x0,x1,x)
#define cimg_for_in5Y(img,y0,y1,y) cimg_for_in5((img)._height,y0,y1,y)
#define cimg_for_in5Z(img,z0,z1,z) cimg_for_in5((img)._depth,z0,z1,z)
#define cimg_for_in5C(img,c0,c1,c) cimg_for_in5((img)._spectrum,c0,c1,c)
#define cimg_for_in5XY(img,x0,y0,x1,y1,x,y) cimg_for_in5Y(img,y0,y1,y) cimg_for_in5X(img,x0,x1,x)
#define cimg_for_in5XZ(img,x0,z0,x1,z1,x,z) cimg_for_in5Z(img,z0,z1,z) cimg_for_in5X(img,x0,x1,x)
#define cimg_for_in5XC(img,x0,c0,x1,c1,x,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5X(img,x0,x1,x)
#define cimg_for_in5YZ(img,y0,z0,y1,z1,y,z) cimg_for_in5Z(img,z0,z1,z) cimg_for_in5Y(img,y0,y1,y)
#define cimg_for_in5YC(img,y0,c0,y1,c1,y,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5Y(img,y0,y1,y)
#define cimg_for_in5ZC(img,z0,c0,z1,c1,z,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5Z(img,z0,z1,z)
#define cimg_for_in5XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in5Z(img,z0,z1,z) cimg_for_in5XY(img,x0,y0,x1,y1,x,y)
#define cimg_for_in5XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5XZ(img,x0,y0,x1,y1,x,z)
#define cimg_for_in5YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5YZ(img,y0,z0,y1,z1,y,z)
#define cimg_for_in5XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) cimg_for_in5C(img,c0,c1,c) cimg_for_in5XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)

#define cimg_for6(bound,i) \
 for (int i = 0, _p2##i = 0, _p1##i = 0, \
      _n1##i = 1>=(bound)?(int)(bound)-1:1, \
      _n2##i = 2>=(bound)?(int)(bound)-1:2, \
      _n3##i = 3>=(bound)?(int)(bound)-1:3; \
      _n3##i<(int)(bound) || _n2##i==--_n3##i || _n1##i==--_n2##i || i==(_n3##i = _n2##i = --_n1##i); \
      _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i)
#define cimg_for6X(img,x) cimg_for6((img)._width,x)
#define cimg_for6Y(img,y) cimg_for6((img)._height,y)
#define cimg_for6Z(img,z) cimg_for6((img)._depth,z)
#define cimg_for6C(img,c) cimg_for6((img)._spectrum,c)
#define cimg_for6XY(img,x,y) cimg_for6Y(img,y) cimg_for6X(img,x)
#define cimg_for6XZ(img,x,z) cimg_for6Z(img,z) cimg_for6X(img,x)
#define cimg_for6XC(img,x,c) cimg_for6C(img,c) cimg_for6X(img,x)
#define cimg_for6YZ(img,y,z) cimg_for6Z(img,z) cimg_for6Y(img,y)
#define cimg_for6YC(img,y,c) cimg_for6C(img,c) cimg_for6Y(img,y)
#define cimg_for6ZC(img,z,c) cimg_for6C(img,c) cimg_for6Z(img,z)
#define cimg_for6XYZ(img,x,y,z) cimg_for6Z(img,z) cimg_for6XY(img,x,y)
#define cimg_for6XZC(img,x,z,c) cimg_for6C(img,c) cimg_for6XZ(img,x,z)
#define cimg_for6YZC(img,y,z,c) cimg_for6C(img,c) cimg_for6YZ(img,y,z)
#define cimg_for6XYZC(img,x,y,z,c) cimg_for6C(img,c) cimg_for6XYZ(img,x,y,z)

#define cimg_for_in6(bound,i0,i1,i) \
 for (int i = (int)(i0)<0?0:(int)(i0), \
      _p2##i = i-2<0?0:i-2, \
      _p1##i = i-1<0?0:i-1, \
      _n1##i = i+1>=(int)(bound)?(int)(bound)-1:i+1, \
      _n2##i = i+2>=(int)(bound)?(int)(bound)-1:i+2, \
      _n3##i = i+3>=(int)(bound)?(int)(bound)-1:i+3; \
      i<=(int)(i1) && (_n3##i<(int)(bound) || _n2##i==--_n3##i || _n1##i==--_n2##i || i==(_n3##i = _n2##i = --_n1##i)); \
      _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i)
#define cimg_for_in6X(img,x0,x1,x) cimg_for_in6((img)._width,x0,x1,x)
#define cimg_for_in6Y(img,y0,y1,y) cimg_for_in6((img)._height,y0,y1,y)
#define cimg_for_in6Z(img,z0,z1,z) cimg_for_in6((img)._depth,z0,z1,z)
#define cimg_for_in6C(img,c0,c1,c) cimg_for_in6((img)._spectrum,c0,c1,c)
#define cimg_for_in6XY(img,x0,y0,x1,y1,x,y) cimg_for_in6Y(img,y0,y1,y) cimg_for_in6X(img,x0,x1,x)
#define cimg_for_in6XZ(img,x0,z0,x1,z1,x,z) cimg_for_in6Z(img,z0,z1,z) cimg_for_in6X(img,x0,x1,x)
#define cimg_for_in6XC(img,x0,c0,x1,c1,x,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6X(img,x0,x1,x)
#define cimg_for_in6YZ(img,y0,z0,y1,z1,y,z) cimg_for_in6Z(img,z0,z1,z) cimg_for_in6Y(img,y0,y1,y)
#define cimg_for_in6YC(img,y0,c0,y1,c1,y,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6Y(img,y0,y1,y)
#define cimg_for_in6ZC(img,z0,c0,z1,c1,z,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6Z(img,z0,z1,z)
#define cimg_for_in6XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in6Z(img,z0,z1,z) cimg_for_in6XY(img,x0,y0,x1,y1,x,y)
#define cimg_for_in6XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6XZ(img,x0,y0,x1,y1,x,z)
#define cimg_for_in6YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6YZ(img,y0,z0,y1,z1,y,z)
#define cimg_for_in6XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) cimg_for_in6C(img,c0,c1,c) cimg_for_in6XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)

#define cimg_for7(bound,i) \
 for (int i = 0, _p3##i = 0, _p2##i = 0, _p1##i = 0, \
      _n1##i = 1>=(bound)?(int)(bound)-1:1, \
      _n2##i = 2>=(bound)?(int)(bound)-1:2, \
      _n3##i = 3>=(bound)?(int)(bound)-1:3; \
      _n3##i<(int)(bound) || _n2##i==--_n3##i || _n1##i==--_n2##i || i==(_n3##i = _n2##i = --_n1##i); \
      _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i)
#define cimg_for7X(img,x) cimg_for7((img)._width,x)
#define cimg_for7Y(img,y) cimg_for7((img)._height,y)
#define cimg_for7Z(img,z) cimg_for7((img)._depth,z)
#define cimg_for7C(img,c) cimg_for7((img)._spectrum,c)
#define cimg_for7XY(img,x,y) cimg_for7Y(img,y) cimg_for7X(img,x)
#define cimg_for7XZ(img,x,z) cimg_for7Z(img,z) cimg_for7X(img,x)
#define cimg_for7XC(img,x,c) cimg_for7C(img,c) cimg_for7X(img,x)
#define cimg_for7YZ(img,y,z) cimg_for7Z(img,z) cimg_for7Y(img,y)
#define cimg_for7YC(img,y,c) cimg_for7C(img,c) cimg_for7Y(img,y)
#define cimg_for7ZC(img,z,c) cimg_for7C(img,c) cimg_for7Z(img,z)
#define cimg_for7XYZ(img,x,y,z) cimg_for7Z(img,z) cimg_for7XY(img,x,y)
#define cimg_for7XZC(img,x,z,c) cimg_for7C(img,c) cimg_for7XZ(img,x,z)
#define cimg_for7YZC(img,y,z,c) cimg_for7C(img,c) cimg_for7YZ(img,y,z)
#define cimg_for7XYZC(img,x,y,z,c) cimg_for7C(img,c) cimg_for7XYZ(img,x,y,z)

#define cimg_for_in7(bound,i0,i1,i) \
 for (int i = (int)(i0)<0?0:(int)(i0), \
      _p3##i = i-3<0?0:i-3, \
      _p2##i = i-2<0?0:i-2, \
      _p1##i = i-1<0?0:i-1, \
      _n1##i = i+1>=(int)(bound)?(int)(bound)-1:i+1, \
      _n2##i = i+2>=(int)(bound)?(int)(bound)-1:i+2, \
      _n3##i = i+3>=(int)(bound)?(int)(bound)-1:i+3; \
      i<=(int)(i1) && (_n3##i<(int)(bound) || _n2##i==--_n3##i || _n1##i==--_n2##i || i==(_n3##i = _n2##i = --_n1##i)); \
      _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i)
#define cimg_for_in7X(img,x0,x1,x) cimg_for_in7((img)._width,x0,x1,x)
#define cimg_for_in7Y(img,y0,y1,y) cimg_for_in7((img)._height,y0,y1,y)
#define cimg_for_in7Z(img,z0,z1,z) cimg_for_in7((img)._depth,z0,z1,z)
#define cimg_for_in7C(img,c0,c1,c) cimg_for_in7((img)._spectrum,c0,c1,c)
#define cimg_for_in7XY(img,x0,y0,x1,y1,x,y) cimg_for_in7Y(img,y0,y1,y) cimg_for_in7X(img,x0,x1,x)
#define cimg_for_in7XZ(img,x0,z0,x1,z1,x,z) cimg_for_in7Z(img,z0,z1,z) cimg_for_in7X(img,x0,x1,x)
#define cimg_for_in7XC(img,x0,c0,x1,c1,x,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7X(img,x0,x1,x)
#define cimg_for_in7YZ(img,y0,z0,y1,z1,y,z) cimg_for_in7Z(img,z0,z1,z) cimg_for_in7Y(img,y0,y1,y)
#define cimg_for_in7YC(img,y0,c0,y1,c1,y,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7Y(img,y0,y1,y)
#define cimg_for_in7ZC(img,z0,c0,z1,c1,z,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7Z(img,z0,z1,z)
#define cimg_for_in7XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in7Z(img,z0,z1,z) cimg_for_in7XY(img,x0,y0,x1,y1,x,y)
#define cimg_for_in7XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7XZ(img,x0,y0,x1,y1,x,z)
#define cimg_for_in7YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7YZ(img,y0,z0,y1,z1,y,z)
#define cimg_for_in7XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) cimg_for_in7C(img,c0,c1,c) cimg_for_in7XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)

#define cimg_for8(bound,i) \
 for (int i = 0, _p3##i = 0, _p2##i = 0, _p1##i = 0, \
      _n1##i = 1>=(bound)?(int)(bound)-1:1, \
      _n2##i = 2>=(bound)?(int)(bound)-1:2, \
      _n3##i = 3>=(bound)?(int)(bound)-1:3, \
      _n4##i = 4>=(bound)?(int)(bound)-1:4; \
      _n4##i<(int)(bound) || _n3##i==--_n4##i || _n2##i==--_n3##i || _n1##i==--_n2##i || \
      i==(_n4##i = _n3##i = _n2##i = --_n1##i); \
      _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i, ++_n4##i)
#define cimg_for8X(img,x) cimg_for8((img)._width,x)
#define cimg_for8Y(img,y) cimg_for8((img)._height,y)
#define cimg_for8Z(img,z) cimg_for8((img)._depth,z)
#define cimg_for8C(img,c) cimg_for8((img)._spectrum,c)
#define cimg_for8XY(img,x,y) cimg_for8Y(img,y) cimg_for8X(img,x)
#define cimg_for8XZ(img,x,z) cimg_for8Z(img,z) cimg_for8X(img,x)
#define cimg_for8XC(img,x,c) cimg_for8C(img,c) cimg_for8X(img,x)
#define cimg_for8YZ(img,y,z) cimg_for8Z(img,z) cimg_for8Y(img,y)
#define cimg_for8YC(img,y,c) cimg_for8C(img,c) cimg_for8Y(img,y)
#define cimg_for8ZC(img,z,c) cimg_for8C(img,c) cimg_for8Z(img,z)
#define cimg_for8XYZ(img,x,y,z) cimg_for8Z(img,z) cimg_for8XY(img,x,y)
#define cimg_for8XZC(img,x,z,c) cimg_for8C(img,c) cimg_for8XZ(img,x,z)
#define cimg_for8YZC(img,y,z,c) cimg_for8C(img,c) cimg_for8YZ(img,y,z)
#define cimg_for8XYZC(img,x,y,z,c) cimg_for8C(img,c) cimg_for8XYZ(img,x,y,z)

#define cimg_for_in8(bound,i0,i1,i) \
 for (int i = (int)(i0)<0?0:(int)(i0), \
      _p3##i = i-3<0?0:i-3, \
      _p2##i = i-2<0?0:i-2, \
      _p1##i = i-1<0?0:i-1, \
      _n1##i = i+1>=(int)(bound)?(int)(bound)-1:i+1, \
      _n2##i = i+2>=(int)(bound)?(int)(bound)-1:i+2, \
      _n3##i = i+3>=(int)(bound)?(int)(bound)-1:i+3, \
      _n4##i = i+4>=(int)(bound)?(int)(bound)-1:i+4; \
      i<=(int)(i1) && (_n4##i<(int)(bound) || _n3##i==--_n4##i || _n2##i==--_n3##i || _n1##i==--_n2##i || \
      i==(_n4##i = _n3##i = _n2##i = --_n1##i)); \
      _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i, ++_n4##i)
#define cimg_for_in8X(img,x0,x1,x) cimg_for_in8((img)._width,x0,x1,x)
#define cimg_for_in8Y(img,y0,y1,y) cimg_for_in8((img)._height,y0,y1,y)
#define cimg_for_in8Z(img,z0,z1,z) cimg_for_in8((img)._depth,z0,z1,z)
#define cimg_for_in8C(img,c0,c1,c) cimg_for_in8((img)._spectrum,c0,c1,c)
#define cimg_for_in8XY(img,x0,y0,x1,y1,x,y) cimg_for_in8Y(img,y0,y1,y) cimg_for_in8X(img,x0,x1,x)
#define cimg_for_in8XZ(img,x0,z0,x1,z1,x,z) cimg_for_in8Z(img,z0,z1,z) cimg_for_in8X(img,x0,x1,x)
#define cimg_for_in8XC(img,x0,c0,x1,c1,x,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8X(img,x0,x1,x)
#define cimg_for_in8YZ(img,y0,z0,y1,z1,y,z) cimg_for_in8Z(img,z0,z1,z) cimg_for_in8Y(img,y0,y1,y)
#define cimg_for_in8YC(img,y0,c0,y1,c1,y,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8Y(img,y0,y1,y)
#define cimg_for_in8ZC(img,z0,c0,z1,c1,z,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8Z(img,z0,z1,z)
#define cimg_for_in8XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in8Z(img,z0,z1,z) cimg_for_in8XY(img,x0,y0,x1,y1,x,y)
#define cimg_for_in8XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8XZ(img,x0,y0,x1,y1,x,z)
#define cimg_for_in8YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8YZ(img,y0,z0,y1,z1,y,z)
#define cimg_for_in8XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) cimg_for_in8C(img,c0,c1,c) cimg_for_in8XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)

#define cimg_for9(bound,i) \
  for (int i = 0, _p4##i = 0, _p3##i = 0, _p2##i = 0, _p1##i = 0, \
       _n1##i = 1>=(int)(bound)?(int)(bound)-1:1, \
       _n2##i = 2>=(int)(bound)?(int)(bound)-1:2, \
       _n3##i = 3>=(int)(bound)?(int)(bound)-1:3, \
       _n4##i = 4>=(int)(bound)?(int)(bound)-1:4; \
       _n4##i<(int)(bound) || _n3##i==--_n4##i || _n2##i==--_n3##i || _n1##i==--_n2##i || \
       i==(_n4##i = _n3##i = _n2##i = --_n1##i); \
       _p4##i = _p3##i, _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i, ++_n4##i)
#define cimg_for9X(img,x) cimg_for9((img)._width,x)
#define cimg_for9Y(img,y) cimg_for9((img)._height,y)
#define cimg_for9Z(img,z) cimg_for9((img)._depth,z)
#define cimg_for9C(img,c) cimg_for9((img)._spectrum,c)
#define cimg_for9XY(img,x,y) cimg_for9Y(img,y) cimg_for9X(img,x)
#define cimg_for9XZ(img,x,z) cimg_for9Z(img,z) cimg_for9X(img,x)
#define cimg_for9XC(img,x,c) cimg_for9C(img,c) cimg_for9X(img,x)
#define cimg_for9YZ(img,y,z) cimg_for9Z(img,z) cimg_for9Y(img,y)
#define cimg_for9YC(img,y,c) cimg_for9C(img,c) cimg_for9Y(img,y)
#define cimg_for9ZC(img,z,c) cimg_for9C(img,c) cimg_for9Z(img,z)
#define cimg_for9XYZ(img,x,y,z) cimg_for9Z(img,z) cimg_for9XY(img,x,y)
#define cimg_for9XZC(img,x,z,c) cimg_for9C(img,c) cimg_for9XZ(img,x,z)
#define cimg_for9YZC(img,y,z,c) cimg_for9C(img,c) cimg_for9YZ(img,y,z)
#define cimg_for9XYZC(img,x,y,z,c) cimg_for9C(img,c) cimg_for9XYZ(img,x,y,z)

#define cimg_for_in9(bound,i0,i1,i) \
  for (int i = (int)(i0)<0?0:(int)(i0), \
       _p4##i = i-4<0?0:i-4, \
       _p3##i = i-3<0?0:i-3, \
       _p2##i = i-2<0?0:i-2, \
       _p1##i = i-1<0?0:i-1, \
       _n1##i = i+1>=(int)(bound)?(int)(bound)-1:i+1, \
       _n2##i = i+2>=(int)(bound)?(int)(bound)-1:i+2, \
       _n3##i = i+3>=(int)(bound)?(int)(bound)-1:i+3, \
       _n4##i = i+4>=(int)(bound)?(int)(bound)-1:i+4; \
       i<=(int)(i1) && (_n4##i<(int)(bound) || _n3##i==--_n4##i || _n2##i==--_n3##i || _n1##i==--_n2##i || \
       i==(_n4##i = _n3##i = _n2##i = --_n1##i)); \
       _p4##i = _p3##i, _p3##i = _p2##i, _p2##i = _p1##i, _p1##i = i++, ++_n1##i, ++_n2##i, ++_n3##i, ++_n4##i)
#define cimg_for_in9X(img,x0,x1,x) cimg_for_in9((img)._width,x0,x1,x)
#define cimg_for_in9Y(img,y0,y1,y) cimg_for_in9((img)._height,y0,y1,y)
#define cimg_for_in9Z(img,z0,z1,z) cimg_for_in9((img)._depth,z0,z1,z)
#define cimg_for_in9C(img,c0,c1,c) cimg_for_in9((img)._spectrum,c0,c1,c)
#define cimg_for_in9XY(img,x0,y0,x1,y1,x,y) cimg_for_in9Y(img,y0,y1,y) cimg_for_in9X(img,x0,x1,x)
#define cimg_for_in9XZ(img,x0,z0,x1,z1,x,z) cimg_for_in9Z(img,z0,z1,z) cimg_for_in9X(img,x0,x1,x)
#define cimg_for_in9XC(img,x0,c0,x1,c1,x,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9X(img,x0,x1,x)
#define cimg_for_in9YZ(img,y0,z0,y1,z1,y,z) cimg_for_in9Z(img,z0,z1,z) cimg_for_in9Y(img,y0,y1,y)
#define cimg_for_in9YC(img,y0,c0,y1,c1,y,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9Y(img,y0,y1,y)
#define cimg_for_in9ZC(img,z0,c0,z1,c1,z,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9Z(img,z0,z1,z)
#define cimg_for_in9XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z) cimg_for_in9Z(img,z0,z1,z) cimg_for_in9XY(img,x0,y0,x1,y1,x,y)
#define cimg_for_in9XZC(img,x0,z0,c0,x1,y1,c1,x,z,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9XZ(img,x0,y0,x1,y1,x,z)
#define cimg_for_in9YZC(img,y0,z0,c0,y1,z1,c1,y,z,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9YZ(img,y0,z0,y1,z1,y,z)
#define cimg_for_in9XYZC(img,x0,y0,z0,c0,x1,y1,z1,c1,x,y,z,c) cimg_for_in9C(img,c0,c1,c) cimg_for_in9XYZ(img,x0,y0,z0,x1,y1,z1,x,y,z)

#define cimg_for2x2(img,x,y,z,c,I,T) \
  cimg_for2((img)._height,y) for (int x = 0, \
   _n1##x = (int)( \
   (I[0] = (T)(img)(0,y,z,c)), \
   (I[2] = (T)(img)(0,_n1##y,z,c)), \
   1>=(img)._width?(img).width()-1:1);  \
   (_n1##x<(img).width() && ( \
   (I[1] = (T)(img)(_n1##x,y,z,c)), \
   (I[3] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
   x==--_n1##x; \
   I[0] = I[1], \
   I[2] = I[3], \
   ++x, ++_n1##x)

#define cimg_for_in2x2(img,x0,y0,x1,y1,x,y,z,c,I,T) \
  cimg_for_in2((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
   _n1##x = (int)( \
   (I[0] = (T)(img)(x,y,z,c)), \
   (I[2] = (T)(img)(x,_n1##y,z,c)), \
   x+1>=(int)(img)._width?(img).width()-1:x+1); \
   x<=(int)(x1) && ((_n1##x<(img).width() && (  \
   (I[1] = (T)(img)(_n1##x,y,z,c)), \
   (I[3] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
   x==--_n1##x); \
   I[0] = I[1], \
   I[2] = I[3], \
   ++x, ++_n1##x)

#define cimg_for3x3(img,x,y,z,c,I,T) \
  cimg_for3((img)._height,y) for (int x = 0, \
   _p1##x = 0, \
   _n1##x = (int)( \
   (I[0] = I[1] = (T)(img)(0,_p1##y,z,c)), \
   (I[3] = I[4] = (T)(img)(0,y,z,c)), \
   (I[6] = I[7] = (T)(img)(0,_n1##y,z,c)),      \
   1>=(img)._width?(img).width()-1:1); \
   (_n1##x<(img).width() && ( \
   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[5] = (T)(img)(_n1##x,y,z,c)), \
   (I[8] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
   x==--_n1##x; \
   I[0] = I[1], I[1] = I[2], \
   I[3] = I[4], I[4] = I[5], \
   I[6] = I[7], I[7] = I[8], \
   _p1##x = x++, ++_n1##x)

#define cimg_for_in3x3(img,x0,y0,x1,y1,x,y,z,c,I,T) \
  cimg_for_in3((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
   _p1##x = x-1<0?0:x-1, \
   _n1##x = (int)( \
   (I[0] = (T)(img)(_p1##x,_p1##y,z,c)), \
   (I[3] = (T)(img)(_p1##x,y,z,c)), \
   (I[6] = (T)(img)(_p1##x,_n1##y,z,c)), \
   (I[1] = (T)(img)(x,_p1##y,z,c)), \
   (I[4] = (T)(img)(x,y,z,c)), \
   (I[7] = (T)(img)(x,_n1##y,z,c)), \
   x+1>=(int)(img)._width?(img).width()-1:x+1); \
   x<=(int)(x1) && ((_n1##x<(img).width() && ( \
   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[5] = (T)(img)(_n1##x,y,z,c)), \
   (I[8] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
   x==--_n1##x);            \
   I[0] = I[1], I[1] = I[2], \
   I[3] = I[4], I[4] = I[5], \
   I[6] = I[7], I[7] = I[8], \
   _p1##x = x++, ++_n1##x)

#define cimg_for4x4(img,x,y,z,c,I,T) \
  cimg_for4((img)._height,y) for (int x = 0, \
   _p1##x = 0, \
   _n1##x = 1>=(img)._width?(img).width()-1:1, \
   _n2##x = (int)( \
   (I[0] = I[1] = (T)(img)(0,_p1##y,z,c)), \
   (I[4] = I[5] = (T)(img)(0,y,z,c)), \
   (I[8] = I[9] = (T)(img)(0,_n1##y,z,c)), \
   (I[12] = I[13] = (T)(img)(0,_n2##y,z,c)), \
   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[6] = (T)(img)(_n1##x,y,z,c)), \
   (I[10] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[14] = (T)(img)(_n1##x,_n2##y,z,c)), \
   2>=(img)._width?(img).width()-1:2); \
   (_n2##x<(img).width() && ( \
   (I[3] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[7] = (T)(img)(_n2##x,y,z,c)), \
   (I[11] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[15] = (T)(img)(_n2##x,_n2##y,z,c)),1)) || \
   _n1##x==--_n2##x || x==(_n2##x = --_n1##x); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], \
   I[4] = I[5], I[5] = I[6], I[6] = I[7], \
   I[8] = I[9], I[9] = I[10], I[10] = I[11], \
   I[12] = I[13], I[13] = I[14], I[14] = I[15], \
   _p1##x = x++, ++_n1##x, ++_n2##x)

#define cimg_for_in4x4(img,x0,y0,x1,y1,x,y,z,c,I,T) \
  cimg_for_in4((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
   _p1##x = x-1<0?0:x-1, \
   _n1##x = x+1>=(int)(img)._width?(img).width()-1:x+1, \
   _n2##x = (int)( \
   (I[0] = (T)(img)(_p1##x,_p1##y,z,c)), \
   (I[4] = (T)(img)(_p1##x,y,z,c)), \
   (I[8] = (T)(img)(_p1##x,_n1##y,z,c)), \
   (I[12] = (T)(img)(_p1##x,_n2##y,z,c)), \
   (I[1] = (T)(img)(x,_p1##y,z,c)), \
   (I[5] = (T)(img)(x,y,z,c)), \
   (I[9] = (T)(img)(x,_n1##y,z,c)), \
   (I[13] = (T)(img)(x,_n2##y,z,c)), \
   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[6] = (T)(img)(_n1##x,y,z,c)), \
   (I[10] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[14] = (T)(img)(_n1##x,_n2##y,z,c)), \
   x+2>=(int)(img)._width?(img).width()-1:x+2); \
   x<=(int)(x1) && ((_n2##x<(img).width() && ( \
   (I[3] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[7] = (T)(img)(_n2##x,y,z,c)), \
   (I[11] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[15] = (T)(img)(_n2##x,_n2##y,z,c)),1)) || \
   _n1##x==--_n2##x || x==(_n2##x = --_n1##x)); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], \
   I[4] = I[5], I[5] = I[6], I[6] = I[7], \
   I[8] = I[9], I[9] = I[10], I[10] = I[11], \
   I[12] = I[13], I[13] = I[14], I[14] = I[15], \
   _p1##x = x++, ++_n1##x, ++_n2##x)

#define cimg_for5x5(img,x,y,z,c,I,T) \
 cimg_for5((img)._height,y) for (int x = 0, \
   _p2##x = 0, _p1##x = 0, \
   _n1##x = 1>=(img)._width?(img).width()-1:1, \
   _n2##x = (int)( \
   (I[0] = I[1] = I[2] = (T)(img)(0,_p2##y,z,c)), \
   (I[5] = I[6] = I[7] = (T)(img)(0,_p1##y,z,c)), \
   (I[10] = I[11] = I[12] = (T)(img)(0,y,z,c)), \
   (I[15] = I[16] = I[17] = (T)(img)(0,_n1##y,z,c)), \
   (I[20] = I[21] = I[22] = (T)(img)(0,_n2##y,z,c)), \
   (I[3] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[8] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[13] = (T)(img)(_n1##x,y,z,c)), \
   (I[18] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[23] = (T)(img)(_n1##x,_n2##y,z,c)),  \
   2>=(img)._width?(img).width()-1:2); \
   (_n2##x<(img).width() && ( \
   (I[4] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[9] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[14] = (T)(img)(_n2##x,y,z,c)), \
   (I[19] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[24] = (T)(img)(_n2##x,_n2##y,z,c)),1)) || \
   _n1##x==--_n2##x || x==(_n2##x = --_n1##x); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], \
   I[5] = I[6], I[6] = I[7], I[7] = I[8], I[8] = I[9], \
   I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], \
   I[15] = I[16], I[16] = I[17], I[17] = I[18], I[18] = I[19], \
   I[20] = I[21], I[21] = I[22], I[22] = I[23], I[23] = I[24], \
   _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x)

#define cimg_for_in5x5(img,x0,y0,x1,y1,x,y,z,c,I,T) \
 cimg_for_in5((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
   _p2##x = x-2<0?0:x-2, \
   _p1##x = x-1<0?0:x-1, \
   _n1##x = x+1>=(int)(img)._width?(img).width()-1:x+1, \
   _n2##x = (int)( \
   (I[0] = (T)(img)(_p2##x,_p2##y,z,c)), \
   (I[5] = (T)(img)(_p2##x,_p1##y,z,c)), \
   (I[10] = (T)(img)(_p2##x,y,z,c)), \
   (I[15] = (T)(img)(_p2##x,_n1##y,z,c)), \
   (I[20] = (T)(img)(_p2##x,_n2##y,z,c)), \
   (I[1] = (T)(img)(_p1##x,_p2##y,z,c)), \
   (I[6] = (T)(img)(_p1##x,_p1##y,z,c)), \
   (I[11] = (T)(img)(_p1##x,y,z,c)), \
   (I[16] = (T)(img)(_p1##x,_n1##y,z,c)), \
   (I[21] = (T)(img)(_p1##x,_n2##y,z,c)), \
   (I[2] = (T)(img)(x,_p2##y,z,c)), \
   (I[7] = (T)(img)(x,_p1##y,z,c)), \
   (I[12] = (T)(img)(x,y,z,c)), \
   (I[17] = (T)(img)(x,_n1##y,z,c)), \
   (I[22] = (T)(img)(x,_n2##y,z,c)), \
   (I[3] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[8] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[13] = (T)(img)(_n1##x,y,z,c)), \
   (I[18] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[23] = (T)(img)(_n1##x,_n2##y,z,c)), \
   x+2>=(int)(img)._width?(img).width()-1:x+2); \
   x<=(int)(x1) && ((_n2##x<(img).width() && ( \
   (I[4] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[9] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[14] = (T)(img)(_n2##x,y,z,c)), \
   (I[19] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[24] = (T)(img)(_n2##x,_n2##y,z,c)),1)) || \
   _n1##x==--_n2##x || x==(_n2##x = --_n1##x)); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], \
   I[5] = I[6], I[6] = I[7], I[7] = I[8], I[8] = I[9], \
   I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], \
   I[15] = I[16], I[16] = I[17], I[17] = I[18], I[18] = I[19], \
   I[20] = I[21], I[21] = I[22], I[22] = I[23], I[23] = I[24], \
   _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x)

#define cimg_for6x6(img,x,y,z,c,I,T) \
 cimg_for6((img)._height,y) for (int x = 0, \
   _p2##x = 0, _p1##x = 0, \
   _n1##x = 1>=(img)._width?(img).width()-1:1, \
   _n2##x = 2>=(img)._width?(img).width()-1:2, \
   _n3##x = (int)( \
   (I[0] = I[1] = I[2] = (T)(img)(0,_p2##y,z,c)), \
   (I[6] = I[7] = I[8] = (T)(img)(0,_p1##y,z,c)), \
   (I[12] = I[13] = I[14] = (T)(img)(0,y,z,c)), \
   (I[18] = I[19] = I[20] = (T)(img)(0,_n1##y,z,c)), \
   (I[24] = I[25] = I[26] = (T)(img)(0,_n2##y,z,c)), \
   (I[30] = I[31] = I[32] = (T)(img)(0,_n3##y,z,c)), \
   (I[3] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[9] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[15] = (T)(img)(_n1##x,y,z,c)), \
   (I[21] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[27] = (T)(img)(_n1##x,_n2##y,z,c)), \
   (I[33] = (T)(img)(_n1##x,_n3##y,z,c)), \
   (I[4] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[10] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[16] = (T)(img)(_n2##x,y,z,c)), \
   (I[22] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[28] = (T)(img)(_n2##x,_n2##y,z,c)), \
   (I[34] = (T)(img)(_n2##x,_n3##y,z,c)), \
   3>=(img)._width?(img).width()-1:3); \
   (_n3##x<(img).width() && ( \
   (I[5] = (T)(img)(_n3##x,_p2##y,z,c)), \
   (I[11] = (T)(img)(_n3##x,_p1##y,z,c)), \
   (I[17] = (T)(img)(_n3##x,y,z,c)), \
   (I[23] = (T)(img)(_n3##x,_n1##y,z,c)), \
   (I[29] = (T)(img)(_n3##x,_n2##y,z,c)), \
   (I[35] = (T)(img)(_n3##x,_n3##y,z,c)),1)) || \
   _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n3## x = _n2##x = --_n1##x); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], \
   I[6] = I[7], I[7] = I[8], I[8] = I[9], I[9] = I[10], I[10] = I[11], \
   I[12] = I[13], I[13] = I[14], I[14] = I[15], I[15] = I[16], I[16] = I[17], \
   I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], \
   I[24] = I[25], I[25] = I[26], I[26] = I[27], I[27] = I[28], I[28] = I[29], \
   I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], I[34] = I[35], \
   _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x)

#define cimg_for_in6x6(img,x0,y0,x1,y1,x,y,z,c,I,T) \
  cimg_for_in6((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)x0, \
   _p2##x = x-2<0?0:x-2, \
   _p1##x = x-1<0?0:x-1, \
   _n1##x = x+1>=(int)(img)._width?(img).width()-1:x+1, \
   _n2##x = x+2>=(int)(img)._width?(img).width()-1:x+2, \
   _n3##x = (int)( \
   (I[0] = (T)(img)(_p2##x,_p2##y,z,c)), \
   (I[6] = (T)(img)(_p2##x,_p1##y,z,c)), \
   (I[12] = (T)(img)(_p2##x,y,z,c)), \
   (I[18] = (T)(img)(_p2##x,_n1##y,z,c)), \
   (I[24] = (T)(img)(_p2##x,_n2##y,z,c)), \
   (I[30] = (T)(img)(_p2##x,_n3##y,z,c)), \
   (I[1] = (T)(img)(_p1##x,_p2##y,z,c)), \
   (I[7] = (T)(img)(_p1##x,_p1##y,z,c)), \
   (I[13] = (T)(img)(_p1##x,y,z,c)), \
   (I[19] = (T)(img)(_p1##x,_n1##y,z,c)), \
   (I[25] = (T)(img)(_p1##x,_n2##y,z,c)), \
   (I[31] = (T)(img)(_p1##x,_n3##y,z,c)), \
   (I[2] = (T)(img)(x,_p2##y,z,c)), \
   (I[8] = (T)(img)(x,_p1##y,z,c)), \
   (I[14] = (T)(img)(x,y,z,c)), \
   (I[20] = (T)(img)(x,_n1##y,z,c)), \
   (I[26] = (T)(img)(x,_n2##y,z,c)), \
   (I[32] = (T)(img)(x,_n3##y,z,c)), \
   (I[3] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[9] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[15] = (T)(img)(_n1##x,y,z,c)), \
   (I[21] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[27] = (T)(img)(_n1##x,_n2##y,z,c)), \
   (I[33] = (T)(img)(_n1##x,_n3##y,z,c)), \
   (I[4] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[10] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[16] = (T)(img)(_n2##x,y,z,c)), \
   (I[22] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[28] = (T)(img)(_n2##x,_n2##y,z,c)), \
   (I[34] = (T)(img)(_n2##x,_n3##y,z,c)), \
   x+3>=(int)(img)._width?(img).width()-1:x+3); \
   x<=(int)(x1) && ((_n3##x<(img).width() && ( \
   (I[5] = (T)(img)(_n3##x,_p2##y,z,c)), \
   (I[11] = (T)(img)(_n3##x,_p1##y,z,c)), \
   (I[17] = (T)(img)(_n3##x,y,z,c)), \
   (I[23] = (T)(img)(_n3##x,_n1##y,z,c)), \
   (I[29] = (T)(img)(_n3##x,_n2##y,z,c)), \
   (I[35] = (T)(img)(_n3##x,_n3##y,z,c)),1)) || \
   _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n3## x = _n2##x = --_n1##x)); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], \
   I[6] = I[7], I[7] = I[8], I[8] = I[9], I[9] = I[10], I[10] = I[11], \
   I[12] = I[13], I[13] = I[14], I[14] = I[15], I[15] = I[16], I[16] = I[17], \
   I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], \
   I[24] = I[25], I[25] = I[26], I[26] = I[27], I[27] = I[28], I[28] = I[29], \
   I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], I[34] = I[35], \
   _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x)

#define cimg_for7x7(img,x,y,z,c,I,T) \
  cimg_for7((img)._height,y) for (int x = 0, \
   _p3##x = 0, _p2##x = 0, _p1##x = 0, \
   _n1##x = 1>=(img)._width?(img).width()-1:1, \
   _n2##x = 2>=(img)._width?(img).width()-1:2, \
   _n3##x = (int)( \
   (I[0] = I[1] = I[2] = I[3] = (T)(img)(0,_p3##y,z,c)), \
   (I[7] = I[8] = I[9] = I[10] = (T)(img)(0,_p2##y,z,c)), \
   (I[14] = I[15] = I[16] = I[17] = (T)(img)(0,_p1##y,z,c)), \
   (I[21] = I[22] = I[23] = I[24] = (T)(img)(0,y,z,c)), \
   (I[28] = I[29] = I[30] = I[31] = (T)(img)(0,_n1##y,z,c)), \
   (I[35] = I[36] = I[37] = I[38] = (T)(img)(0,_n2##y,z,c)), \
   (I[42] = I[43] = I[44] = I[45] = (T)(img)(0,_n3##y,z,c)), \
   (I[4] = (T)(img)(_n1##x,_p3##y,z,c)), \
   (I[11] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[18] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[25] = (T)(img)(_n1##x,y,z,c)), \
   (I[32] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[39] = (T)(img)(_n1##x,_n2##y,z,c)), \
   (I[46] = (T)(img)(_n1##x,_n3##y,z,c)), \
   (I[5] = (T)(img)(_n2##x,_p3##y,z,c)), \
   (I[12] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[19] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[26] = (T)(img)(_n2##x,y,z,c)), \
   (I[33] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[40] = (T)(img)(_n2##x,_n2##y,z,c)), \
   (I[47] = (T)(img)(_n2##x,_n3##y,z,c)), \
   3>=(img)._width?(img).width()-1:3); \
   (_n3##x<(img).width() && ( \
   (I[6] = (T)(img)(_n3##x,_p3##y,z,c)), \
   (I[13] = (T)(img)(_n3##x,_p2##y,z,c)), \
   (I[20] = (T)(img)(_n3##x,_p1##y,z,c)), \
   (I[27] = (T)(img)(_n3##x,y,z,c)), \
   (I[34] = (T)(img)(_n3##x,_n1##y,z,c)), \
   (I[41] = (T)(img)(_n3##x,_n2##y,z,c)), \
   (I[48] = (T)(img)(_n3##x,_n3##y,z,c)),1)) || \
   _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n3##x = _n2##x = --_n1##x); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], \
   I[7] = I[8], I[8] = I[9], I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], \
   I[14] = I[15], I[15] = I[16], I[16] = I[17], I[17] = I[18], I[18] = I[19], I[19] = I[20], \
   I[21] = I[22], I[22] = I[23], I[23] = I[24], I[24] = I[25], I[25] = I[26], I[26] = I[27], \
   I[28] = I[29], I[29] = I[30], I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], \
   I[35] = I[36], I[36] = I[37], I[37] = I[38], I[38] = I[39], I[39] = I[40], I[40] = I[41], \
   I[42] = I[43], I[43] = I[44], I[44] = I[45], I[45] = I[46], I[46] = I[47], I[47] = I[48], \
   _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x)

#define cimg_for_in7x7(img,x0,y0,x1,y1,x,y,z,c,I,T) \
  cimg_for_in7((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
   _p3##x = x-3<0?0:x-3, \
   _p2##x = x-2<0?0:x-2, \
   _p1##x = x-1<0?0:x-1, \
   _n1##x = x+1>=(int)(img)._width?(img).width()-1:x+1, \
   _n2##x = x+2>=(int)(img)._width?(img).width()-1:x+2, \
   _n3##x = (int)( \
   (I[0] = (T)(img)(_p3##x,_p3##y,z,c)), \
   (I[7] = (T)(img)(_p3##x,_p2##y,z,c)), \
   (I[14] = (T)(img)(_p3##x,_p1##y,z,c)), \
   (I[21] = (T)(img)(_p3##x,y,z,c)), \
   (I[28] = (T)(img)(_p3##x,_n1##y,z,c)), \
   (I[35] = (T)(img)(_p3##x,_n2##y,z,c)), \
   (I[42] = (T)(img)(_p3##x,_n3##y,z,c)), \
   (I[1] = (T)(img)(_p2##x,_p3##y,z,c)), \
   (I[8] = (T)(img)(_p2##x,_p2##y,z,c)), \
   (I[15] = (T)(img)(_p2##x,_p1##y,z,c)), \
   (I[22] = (T)(img)(_p2##x,y,z,c)), \
   (I[29] = (T)(img)(_p2##x,_n1##y,z,c)), \
   (I[36] = (T)(img)(_p2##x,_n2##y,z,c)), \
   (I[43] = (T)(img)(_p2##x,_n3##y,z,c)), \
   (I[2] = (T)(img)(_p1##x,_p3##y,z,c)), \
   (I[9] = (T)(img)(_p1##x,_p2##y,z,c)), \
   (I[16] = (T)(img)(_p1##x,_p1##y,z,c)), \
   (I[23] = (T)(img)(_p1##x,y,z,c)), \
   (I[30] = (T)(img)(_p1##x,_n1##y,z,c)), \
   (I[37] = (T)(img)(_p1##x,_n2##y,z,c)), \
   (I[44] = (T)(img)(_p1##x,_n3##y,z,c)), \
   (I[3] = (T)(img)(x,_p3##y,z,c)), \
   (I[10] = (T)(img)(x,_p2##y,z,c)), \
   (I[17] = (T)(img)(x,_p1##y,z,c)), \
   (I[24] = (T)(img)(x,y,z,c)), \
   (I[31] = (T)(img)(x,_n1##y,z,c)), \
   (I[38] = (T)(img)(x,_n2##y,z,c)), \
   (I[45] = (T)(img)(x,_n3##y,z,c)), \
   (I[4] = (T)(img)(_n1##x,_p3##y,z,c)), \
   (I[11] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[18] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[25] = (T)(img)(_n1##x,y,z,c)), \
   (I[32] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[39] = (T)(img)(_n1##x,_n2##y,z,c)), \
   (I[46] = (T)(img)(_n1##x,_n3##y,z,c)), \
   (I[5] = (T)(img)(_n2##x,_p3##y,z,c)), \
   (I[12] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[19] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[26] = (T)(img)(_n2##x,y,z,c)), \
   (I[33] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[40] = (T)(img)(_n2##x,_n2##y,z,c)), \
   (I[47] = (T)(img)(_n2##x,_n3##y,z,c)), \
   x+3>=(int)(img)._width?(img).width()-1:x+3); \
   x<=(int)(x1) && ((_n3##x<(img).width() && ( \
   (I[6] = (T)(img)(_n3##x,_p3##y,z,c)), \
   (I[13] = (T)(img)(_n3##x,_p2##y,z,c)), \
   (I[20] = (T)(img)(_n3##x,_p1##y,z,c)), \
   (I[27] = (T)(img)(_n3##x,y,z,c)), \
   (I[34] = (T)(img)(_n3##x,_n1##y,z,c)), \
   (I[41] = (T)(img)(_n3##x,_n2##y,z,c)), \
   (I[48] = (T)(img)(_n3##x,_n3##y,z,c)),1)) || \
   _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n3##x = _n2##x = --_n1##x)); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], \
   I[7] = I[8], I[8] = I[9], I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], \
   I[14] = I[15], I[15] = I[16], I[16] = I[17], I[17] = I[18], I[18] = I[19], I[19] = I[20], \
   I[21] = I[22], I[22] = I[23], I[23] = I[24], I[24] = I[25], I[25] = I[26], I[26] = I[27], \
   I[28] = I[29], I[29] = I[30], I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], \
   I[35] = I[36], I[36] = I[37], I[37] = I[38], I[38] = I[39], I[39] = I[40], I[40] = I[41], \
   I[42] = I[43], I[43] = I[44], I[44] = I[45], I[45] = I[46], I[46] = I[47], I[47] = I[48], \
   _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x)

#define cimg_for8x8(img,x,y,z,c,I,T) \
  cimg_for8((img)._height,y) for (int x = 0, \
   _p3##x = 0, _p2##x = 0, _p1##x = 0, \
   _n1##x = 1>=((img)._width)?(img).width()-1:1, \
   _n2##x = 2>=((img)._width)?(img).width()-1:2, \
   _n3##x = 3>=((img)._width)?(img).width()-1:3, \
   _n4##x = (int)( \
   (I[0] = I[1] = I[2] = I[3] = (T)(img)(0,_p3##y,z,c)), \
   (I[8] = I[9] = I[10] = I[11] = (T)(img)(0,_p2##y,z,c)), \
   (I[16] = I[17] = I[18] = I[19] = (T)(img)(0,_p1##y,z,c)), \
   (I[24] = I[25] = I[26] = I[27] = (T)(img)(0,y,z,c)), \
   (I[32] = I[33] = I[34] = I[35] = (T)(img)(0,_n1##y,z,c)), \
   (I[40] = I[41] = I[42] = I[43] = (T)(img)(0,_n2##y,z,c)), \
   (I[48] = I[49] = I[50] = I[51] = (T)(img)(0,_n3##y,z,c)), \
   (I[56] = I[57] = I[58] = I[59] = (T)(img)(0,_n4##y,z,c)), \
   (I[4] = (T)(img)(_n1##x,_p3##y,z,c)), \
   (I[12] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[20] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[28] = (T)(img)(_n1##x,y,z,c)), \
   (I[36] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[44] = (T)(img)(_n1##x,_n2##y,z,c)), \
   (I[52] = (T)(img)(_n1##x,_n3##y,z,c)), \
   (I[60] = (T)(img)(_n1##x,_n4##y,z,c)), \
   (I[5] = (T)(img)(_n2##x,_p3##y,z,c)), \
   (I[13] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[21] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[29] = (T)(img)(_n2##x,y,z,c)), \
   (I[37] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[45] = (T)(img)(_n2##x,_n2##y,z,c)), \
   (I[53] = (T)(img)(_n2##x,_n3##y,z,c)), \
   (I[61] = (T)(img)(_n2##x,_n4##y,z,c)), \
   (I[6] = (T)(img)(_n3##x,_p3##y,z,c)), \
   (I[14] = (T)(img)(_n3##x,_p2##y,z,c)), \
   (I[22] = (T)(img)(_n3##x,_p1##y,z,c)), \
   (I[30] = (T)(img)(_n3##x,y,z,c)), \
   (I[38] = (T)(img)(_n3##x,_n1##y,z,c)), \
   (I[46] = (T)(img)(_n3##x,_n2##y,z,c)), \
   (I[54] = (T)(img)(_n3##x,_n3##y,z,c)), \
   (I[62] = (T)(img)(_n3##x,_n4##y,z,c)), \
   4>=((img)._width)?(img).width()-1:4); \
   (_n4##x<(img).width() && ( \
   (I[7] = (T)(img)(_n4##x,_p3##y,z,c)), \
   (I[15] = (T)(img)(_n4##x,_p2##y,z,c)), \
   (I[23] = (T)(img)(_n4##x,_p1##y,z,c)), \
   (I[31] = (T)(img)(_n4##x,y,z,c)), \
   (I[39] = (T)(img)(_n4##x,_n1##y,z,c)), \
   (I[47] = (T)(img)(_n4##x,_n2##y,z,c)), \
   (I[55] = (T)(img)(_n4##x,_n3##y,z,c)), \
   (I[63] = (T)(img)(_n4##x,_n4##y,z,c)),1)) || \
   _n3##x==--_n4##x || _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n4##x = _n3##x = _n2##x = --_n1##x); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], I[6] = I[7], \
   I[8] = I[9], I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], I[14] = I[15], \
   I[16] = I[17], I[17] = I[18], I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], \
   I[24] = I[25], I[25] = I[26], I[26] = I[27], I[27] = I[28], I[28] = I[29], I[29] = I[30], I[30] = I[31], \
   I[32] = I[33], I[33] = I[34], I[34] = I[35], I[35] = I[36], I[36] = I[37], I[37] = I[38], I[38] = I[39], \
   I[40] = I[41], I[41] = I[42], I[42] = I[43], I[43] = I[44], I[44] = I[45], I[45] = I[46], I[46] = I[47], \
   I[48] = I[49], I[49] = I[50], I[50] = I[51], I[51] = I[52], I[52] = I[53], I[53] = I[54], I[54] = I[55], \
   I[56] = I[57], I[57] = I[58], I[58] = I[59], I[59] = I[60], I[60] = I[61], I[61] = I[62], I[62] = I[63], \
   _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x, ++_n4##x)

#define cimg_for_in8x8(img,x0,y0,x1,y1,x,y,z,c,I,T) \
  cimg_for_in8((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
   _p3##x = x-3<0?0:x-3, \
   _p2##x = x-2<0?0:x-2, \
   _p1##x = x-1<0?0:x-1, \
   _n1##x = x+1>=(img).width()?(img).width()-1:x+1, \
   _n2##x = x+2>=(img).width()?(img).width()-1:x+2, \
   _n3##x = x+3>=(img).width()?(img).width()-1:x+3, \
   _n4##x = (int)( \
   (I[0] = (T)(img)(_p3##x,_p3##y,z,c)), \
   (I[8] = (T)(img)(_p3##x,_p2##y,z,c)), \
   (I[16] = (T)(img)(_p3##x,_p1##y,z,c)), \
   (I[24] = (T)(img)(_p3##x,y,z,c)), \
   (I[32] = (T)(img)(_p3##x,_n1##y,z,c)), \
   (I[40] = (T)(img)(_p3##x,_n2##y,z,c)), \
   (I[48] = (T)(img)(_p3##x,_n3##y,z,c)), \
   (I[56] = (T)(img)(_p3##x,_n4##y,z,c)), \
   (I[1] = (T)(img)(_p2##x,_p3##y,z,c)), \
   (I[9] = (T)(img)(_p2##x,_p2##y,z,c)), \
   (I[17] = (T)(img)(_p2##x,_p1##y,z,c)), \
   (I[25] = (T)(img)(_p2##x,y,z,c)), \
   (I[33] = (T)(img)(_p2##x,_n1##y,z,c)), \
   (I[41] = (T)(img)(_p2##x,_n2##y,z,c)), \
   (I[49] = (T)(img)(_p2##x,_n3##y,z,c)), \
   (I[57] = (T)(img)(_p2##x,_n4##y,z,c)), \
   (I[2] = (T)(img)(_p1##x,_p3##y,z,c)), \
   (I[10] = (T)(img)(_p1##x,_p2##y,z,c)), \
   (I[18] = (T)(img)(_p1##x,_p1##y,z,c)), \
   (I[26] = (T)(img)(_p1##x,y,z,c)), \
   (I[34] = (T)(img)(_p1##x,_n1##y,z,c)), \
   (I[42] = (T)(img)(_p1##x,_n2##y,z,c)), \
   (I[50] = (T)(img)(_p1##x,_n3##y,z,c)), \
   (I[58] = (T)(img)(_p1##x,_n4##y,z,c)), \
   (I[3] = (T)(img)(x,_p3##y,z,c)), \
   (I[11] = (T)(img)(x,_p2##y,z,c)), \
   (I[19] = (T)(img)(x,_p1##y,z,c)), \
   (I[27] = (T)(img)(x,y,z,c)), \
   (I[35] = (T)(img)(x,_n1##y,z,c)), \
   (I[43] = (T)(img)(x,_n2##y,z,c)), \
   (I[51] = (T)(img)(x,_n3##y,z,c)), \
   (I[59] = (T)(img)(x,_n4##y,z,c)), \
   (I[4] = (T)(img)(_n1##x,_p3##y,z,c)), \
   (I[12] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[20] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[28] = (T)(img)(_n1##x,y,z,c)), \
   (I[36] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[44] = (T)(img)(_n1##x,_n2##y,z,c)), \
   (I[52] = (T)(img)(_n1##x,_n3##y,z,c)), \
   (I[60] = (T)(img)(_n1##x,_n4##y,z,c)), \
   (I[5] = (T)(img)(_n2##x,_p3##y,z,c)), \
   (I[13] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[21] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[29] = (T)(img)(_n2##x,y,z,c)), \
   (I[37] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[45] = (T)(img)(_n2##x,_n2##y,z,c)), \
   (I[53] = (T)(img)(_n2##x,_n3##y,z,c)), \
   (I[61] = (T)(img)(_n2##x,_n4##y,z,c)), \
   (I[6] = (T)(img)(_n3##x,_p3##y,z,c)), \
   (I[14] = (T)(img)(_n3##x,_p2##y,z,c)), \
   (I[22] = (T)(img)(_n3##x,_p1##y,z,c)), \
   (I[30] = (T)(img)(_n3##x,y,z,c)), \
   (I[38] = (T)(img)(_n3##x,_n1##y,z,c)), \
   (I[46] = (T)(img)(_n3##x,_n2##y,z,c)), \
   (I[54] = (T)(img)(_n3##x,_n3##y,z,c)), \
   (I[62] = (T)(img)(_n3##x,_n4##y,z,c)), \
   x+4>=(img).width()?(img).width()-1:x+4); \
   x<=(int)(x1) && ((_n4##x<(img).width() && ( \
   (I[7] = (T)(img)(_n4##x,_p3##y,z,c)), \
   (I[15] = (T)(img)(_n4##x,_p2##y,z,c)), \
   (I[23] = (T)(img)(_n4##x,_p1##y,z,c)), \
   (I[31] = (T)(img)(_n4##x,y,z,c)), \
   (I[39] = (T)(img)(_n4##x,_n1##y,z,c)), \
   (I[47] = (T)(img)(_n4##x,_n2##y,z,c)), \
   (I[55] = (T)(img)(_n4##x,_n3##y,z,c)), \
   (I[63] = (T)(img)(_n4##x,_n4##y,z,c)),1)) || \
   _n3##x==--_n4##x || _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n4##x = _n3##x = _n2##x = --_n1##x)); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], I[6] = I[7], \
   I[8] = I[9], I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], I[14] = I[15], \
   I[16] = I[17], I[17] = I[18], I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], \
   I[24] = I[25], I[25] = I[26], I[26] = I[27], I[27] = I[28], I[28] = I[29], I[29] = I[30], I[30] = I[31], \
   I[32] = I[33], I[33] = I[34], I[34] = I[35], I[35] = I[36], I[36] = I[37], I[37] = I[38], I[38] = I[39], \
   I[40] = I[41], I[41] = I[42], I[42] = I[43], I[43] = I[44], I[44] = I[45], I[45] = I[46], I[46] = I[47], \
   I[48] = I[49], I[49] = I[50], I[50] = I[51], I[51] = I[52], I[52] = I[53], I[53] = I[54], I[54] = I[55], \
   I[56] = I[57], I[57] = I[58], I[58] = I[59], I[59] = I[60], I[60] = I[61], I[61] = I[62], I[62] = I[63], \
   _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x, ++_n4##x)

#define cimg_for9x9(img,x,y,z,c,I,T) \
  cimg_for9((img)._height,y) for (int x = 0, \
   _p4##x = 0, _p3##x = 0, _p2##x = 0, _p1##x = 0, \
   _n1##x = 1>=((img)._width)?(img).width()-1:1, \
   _n2##x = 2>=((img)._width)?(img).width()-1:2, \
   _n3##x = 3>=((img)._width)?(img).width()-1:3, \
   _n4##x = (int)( \
   (I[0] = I[1] = I[2] = I[3] = I[4] = (T)(img)(0,_p4##y,z,c)), \
   (I[9] = I[10] = I[11] = I[12] = I[13] = (T)(img)(0,_p3##y,z,c)), \
   (I[18] = I[19] = I[20] = I[21] = I[22] = (T)(img)(0,_p2##y,z,c)), \
   (I[27] = I[28] = I[29] = I[30] = I[31] = (T)(img)(0,_p1##y,z,c)), \
   (I[36] = I[37] = I[38] = I[39] = I[40] = (T)(img)(0,y,z,c)), \
   (I[45] = I[46] = I[47] = I[48] = I[49] = (T)(img)(0,_n1##y,z,c)), \
   (I[54] = I[55] = I[56] = I[57] = I[58] = (T)(img)(0,_n2##y,z,c)), \
   (I[63] = I[64] = I[65] = I[66] = I[67] = (T)(img)(0,_n3##y,z,c)), \
   (I[72] = I[73] = I[74] = I[75] = I[76] = (T)(img)(0,_n4##y,z,c)), \
   (I[5] = (T)(img)(_n1##x,_p4##y,z,c)), \
   (I[14] = (T)(img)(_n1##x,_p3##y,z,c)), \
   (I[23] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[32] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[41] = (T)(img)(_n1##x,y,z,c)), \
   (I[50] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[59] = (T)(img)(_n1##x,_n2##y,z,c)), \
   (I[68] = (T)(img)(_n1##x,_n3##y,z,c)), \
   (I[77] = (T)(img)(_n1##x,_n4##y,z,c)), \
   (I[6] = (T)(img)(_n2##x,_p4##y,z,c)), \
   (I[15] = (T)(img)(_n2##x,_p3##y,z,c)), \
   (I[24] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[33] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[42] = (T)(img)(_n2##x,y,z,c)), \
   (I[51] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[60] = (T)(img)(_n2##x,_n2##y,z,c)), \
   (I[69] = (T)(img)(_n2##x,_n3##y,z,c)), \
   (I[78] = (T)(img)(_n2##x,_n4##y,z,c)), \
   (I[7] = (T)(img)(_n3##x,_p4##y,z,c)), \
   (I[16] = (T)(img)(_n3##x,_p3##y,z,c)), \
   (I[25] = (T)(img)(_n3##x,_p2##y,z,c)), \
   (I[34] = (T)(img)(_n3##x,_p1##y,z,c)), \
   (I[43] = (T)(img)(_n3##x,y,z,c)), \
   (I[52] = (T)(img)(_n3##x,_n1##y,z,c)), \
   (I[61] = (T)(img)(_n3##x,_n2##y,z,c)), \
   (I[70] = (T)(img)(_n3##x,_n3##y,z,c)), \
   (I[79] = (T)(img)(_n3##x,_n4##y,z,c)), \
   4>=((img)._width)?(img).width()-1:4); \
   (_n4##x<(img).width() && ( \
   (I[8] = (T)(img)(_n4##x,_p4##y,z,c)), \
   (I[17] = (T)(img)(_n4##x,_p3##y,z,c)), \
   (I[26] = (T)(img)(_n4##x,_p2##y,z,c)), \
   (I[35] = (T)(img)(_n4##x,_p1##y,z,c)), \
   (I[44] = (T)(img)(_n4##x,y,z,c)), \
   (I[53] = (T)(img)(_n4##x,_n1##y,z,c)), \
   (I[62] = (T)(img)(_n4##x,_n2##y,z,c)), \
   (I[71] = (T)(img)(_n4##x,_n3##y,z,c)), \
   (I[80] = (T)(img)(_n4##x,_n4##y,z,c)),1)) || \
   _n3##x==--_n4##x || _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n4##x = _n3##x = _n2##x = --_n1##x); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], I[6] = I[7], I[7] = I[8], \
   I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], I[14] = I[15], I[15] = I[16], I[16] = I[17], \
   I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], I[23] = I[24], I[24] = I[25], I[25] = I[26], \
   I[27] = I[28], I[28] = I[29], I[29] = I[30], I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], I[34] = I[35], \
   I[36] = I[37], I[37] = I[38], I[38] = I[39], I[39] = I[40], I[40] = I[41], I[41] = I[42], I[42] = I[43], I[43] = I[44], \
   I[45] = I[46], I[46] = I[47], I[47] = I[48], I[48] = I[49], I[49] = I[50], I[50] = I[51], I[51] = I[52], I[52] = I[53], \
   I[54] = I[55], I[55] = I[56], I[56] = I[57], I[57] = I[58], I[58] = I[59], I[59] = I[60], I[60] = I[61], I[61] = I[62], \
   I[63] = I[64], I[64] = I[65], I[65] = I[66], I[66] = I[67], I[67] = I[68], I[68] = I[69], I[69] = I[70], I[70] = I[71], \
   I[72] = I[73], I[73] = I[74], I[74] = I[75], I[75] = I[76], I[76] = I[77], I[77] = I[78], I[78] = I[79], I[79] = I[80], \
   _p4##x = _p3##x, _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x, ++_n4##x)

#define cimg_for_in9x9(img,x0,y0,x1,y1,x,y,z,c,I,T) \
  cimg_for_in9((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
   _p4##x = x-4<0?0:x-4, \
   _p3##x = x-3<0?0:x-3, \
   _p2##x = x-2<0?0:x-2, \
   _p1##x = x-1<0?0:x-1, \
   _n1##x = x+1>=(img).width()?(img).width()-1:x+1, \
   _n2##x = x+2>=(img).width()?(img).width()-1:x+2, \
   _n3##x = x+3>=(img).width()?(img).width()-1:x+3, \
   _n4##x = (int)( \
   (I[0] = (T)(img)(_p4##x,_p4##y,z,c)), \
   (I[9] = (T)(img)(_p4##x,_p3##y,z,c)), \
   (I[18] = (T)(img)(_p4##x,_p2##y,z,c)), \
   (I[27] = (T)(img)(_p4##x,_p1##y,z,c)), \
   (I[36] = (T)(img)(_p4##x,y,z,c)), \
   (I[45] = (T)(img)(_p4##x,_n1##y,z,c)), \
   (I[54] = (T)(img)(_p4##x,_n2##y,z,c)), \
   (I[63] = (T)(img)(_p4##x,_n3##y,z,c)), \
   (I[72] = (T)(img)(_p4##x,_n4##y,z,c)), \
   (I[1] = (T)(img)(_p3##x,_p4##y,z,c)), \
   (I[10] = (T)(img)(_p3##x,_p3##y,z,c)), \
   (I[19] = (T)(img)(_p3##x,_p2##y,z,c)), \
   (I[28] = (T)(img)(_p3##x,_p1##y,z,c)), \
   (I[37] = (T)(img)(_p3##x,y,z,c)), \
   (I[46] = (T)(img)(_p3##x,_n1##y,z,c)), \
   (I[55] = (T)(img)(_p3##x,_n2##y,z,c)), \
   (I[64] = (T)(img)(_p3##x,_n3##y,z,c)), \
   (I[73] = (T)(img)(_p3##x,_n4##y,z,c)), \
   (I[2] = (T)(img)(_p2##x,_p4##y,z,c)), \
   (I[11] = (T)(img)(_p2##x,_p3##y,z,c)), \
   (I[20] = (T)(img)(_p2##x,_p2##y,z,c)), \
   (I[29] = (T)(img)(_p2##x,_p1##y,z,c)), \
   (I[38] = (T)(img)(_p2##x,y,z,c)), \
   (I[47] = (T)(img)(_p2##x,_n1##y,z,c)), \
   (I[56] = (T)(img)(_p2##x,_n2##y,z,c)), \
   (I[65] = (T)(img)(_p2##x,_n3##y,z,c)), \
   (I[74] = (T)(img)(_p2##x,_n4##y,z,c)), \
   (I[3] = (T)(img)(_p1##x,_p4##y,z,c)), \
   (I[12] = (T)(img)(_p1##x,_p3##y,z,c)), \
   (I[21] = (T)(img)(_p1##x,_p2##y,z,c)), \
   (I[30] = (T)(img)(_p1##x,_p1##y,z,c)), \
   (I[39] = (T)(img)(_p1##x,y,z,c)), \
   (I[48] = (T)(img)(_p1##x,_n1##y,z,c)), \
   (I[57] = (T)(img)(_p1##x,_n2##y,z,c)), \
   (I[66] = (T)(img)(_p1##x,_n3##y,z,c)), \
   (I[75] = (T)(img)(_p1##x,_n4##y,z,c)), \
   (I[4] = (T)(img)(x,_p4##y,z,c)), \
   (I[13] = (T)(img)(x,_p3##y,z,c)), \
   (I[22] = (T)(img)(x,_p2##y,z,c)), \
   (I[31] = (T)(img)(x,_p1##y,z,c)), \
   (I[40] = (T)(img)(x,y,z,c)), \
   (I[49] = (T)(img)(x,_n1##y,z,c)), \
   (I[58] = (T)(img)(x,_n2##y,z,c)), \
   (I[67] = (T)(img)(x,_n3##y,z,c)), \
   (I[76] = (T)(img)(x,_n4##y,z,c)), \
   (I[5] = (T)(img)(_n1##x,_p4##y,z,c)), \
   (I[14] = (T)(img)(_n1##x,_p3##y,z,c)), \
   (I[23] = (T)(img)(_n1##x,_p2##y,z,c)), \
   (I[32] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[41] = (T)(img)(_n1##x,y,z,c)), \
   (I[50] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[59] = (T)(img)(_n1##x,_n2##y,z,c)), \
   (I[68] = (T)(img)(_n1##x,_n3##y,z,c)), \
   (I[77] = (T)(img)(_n1##x,_n4##y,z,c)), \
   (I[6] = (T)(img)(_n2##x,_p4##y,z,c)), \
   (I[15] = (T)(img)(_n2##x,_p3##y,z,c)), \
   (I[24] = (T)(img)(_n2##x,_p2##y,z,c)), \
   (I[33] = (T)(img)(_n2##x,_p1##y,z,c)), \
   (I[42] = (T)(img)(_n2##x,y,z,c)), \
   (I[51] = (T)(img)(_n2##x,_n1##y,z,c)), \
   (I[60] = (T)(img)(_n2##x,_n2##y,z,c)), \
   (I[69] = (T)(img)(_n2##x,_n3##y,z,c)), \
   (I[78] = (T)(img)(_n2##x,_n4##y,z,c)), \
   (I[7] = (T)(img)(_n3##x,_p4##y,z,c)), \
   (I[16] = (T)(img)(_n3##x,_p3##y,z,c)), \
   (I[25] = (T)(img)(_n3##x,_p2##y,z,c)), \
   (I[34] = (T)(img)(_n3##x,_p1##y,z,c)), \
   (I[43] = (T)(img)(_n3##x,y,z,c)), \
   (I[52] = (T)(img)(_n3##x,_n1##y,z,c)), \
   (I[61] = (T)(img)(_n3##x,_n2##y,z,c)), \
   (I[70] = (T)(img)(_n3##x,_n3##y,z,c)), \
   (I[79] = (T)(img)(_n3##x,_n4##y,z,c)), \
   x+4>=(img).width()?(img).width()-1:x+4); \
   x<=(int)(x1) && ((_n4##x<(img).width() && ( \
   (I[8] = (T)(img)(_n4##x,_p4##y,z,c)), \
   (I[17] = (T)(img)(_n4##x,_p3##y,z,c)), \
   (I[26] = (T)(img)(_n4##x,_p2##y,z,c)), \
   (I[35] = (T)(img)(_n4##x,_p1##y,z,c)), \
   (I[44] = (T)(img)(_n4##x,y,z,c)), \
   (I[53] = (T)(img)(_n4##x,_n1##y,z,c)), \
   (I[62] = (T)(img)(_n4##x,_n2##y,z,c)), \
   (I[71] = (T)(img)(_n4##x,_n3##y,z,c)), \
   (I[80] = (T)(img)(_n4##x,_n4##y,z,c)),1)) || \
   _n3##x==--_n4##x || _n2##x==--_n3##x || _n1##x==--_n2##x || x==(_n4##x = _n3##x = _n2##x = --_n1##x)); \
   I[0] = I[1], I[1] = I[2], I[2] = I[3], I[3] = I[4], I[4] = I[5], I[5] = I[6], I[6] = I[7], I[7] = I[8], \
   I[9] = I[10], I[10] = I[11], I[11] = I[12], I[12] = I[13], I[13] = I[14], I[14] = I[15], I[15] = I[16], I[16] = I[17], \
   I[18] = I[19], I[19] = I[20], I[20] = I[21], I[21] = I[22], I[22] = I[23], I[23] = I[24], I[24] = I[25], I[25] = I[26], \
   I[27] = I[28], I[28] = I[29], I[29] = I[30], I[30] = I[31], I[31] = I[32], I[32] = I[33], I[33] = I[34], I[34] = I[35], \
   I[36] = I[37], I[37] = I[38], I[38] = I[39], I[39] = I[40], I[40] = I[41], I[41] = I[42], I[42] = I[43], I[43] = I[44], \
   I[45] = I[46], I[46] = I[47], I[47] = I[48], I[48] = I[49], I[49] = I[50], I[50] = I[51], I[51] = I[52], I[52] = I[53], \
   I[54] = I[55], I[55] = I[56], I[56] = I[57], I[57] = I[58], I[58] = I[59], I[59] = I[60], I[60] = I[61], I[61] = I[62], \
   I[63] = I[64], I[64] = I[65], I[65] = I[66], I[66] = I[67], I[67] = I[68], I[68] = I[69], I[69] = I[70], I[70] = I[71], \
   I[72] = I[73], I[73] = I[74], I[74] = I[75], I[75] = I[76], I[76] = I[77], I[77] = I[78], I[78] = I[79], I[79] = I[80], \
   _p4##x = _p3##x, _p3##x = _p2##x, _p2##x = _p1##x, _p1##x = x++, ++_n1##x, ++_n2##x, ++_n3##x, ++_n4##x)

#define cimg_for2x2x2(img,x,y,z,c,I,T) \
 cimg_for2((img)._depth,z) cimg_for2((img)._height,y) for (int x = 0, \
   _n1##x = (int)( \
   (I[0] = (T)(img)(0,y,z,c)), \
   (I[2] = (T)(img)(0,_n1##y,z,c)), \
   (I[4] = (T)(img)(0,y,_n1##z,c)), \
   (I[6] = (T)(img)(0,_n1##y,_n1##z,c)), \
   1>=(img)._width?(img).width()-1:1); \
   (_n1##x<(img).width() && ( \
   (I[1] = (T)(img)(_n1##x,y,z,c)), \
   (I[3] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[5] = (T)(img)(_n1##x,y,_n1##z,c)), \
   (I[7] = (T)(img)(_n1##x,_n1##y,_n1##z,c)),1)) || \
   x==--_n1##x; \
   I[0] = I[1], I[2] = I[3], I[4] = I[5], I[6] = I[7], \
   ++x, ++_n1##x)

#define cimg_for_in2x2x2(img,x0,y0,z0,x1,y1,z1,x,y,z,c,I,T) \
 cimg_for_in2((img)._depth,z0,z1,z) cimg_for_in2((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
   _n1##x = (int)( \
   (I[0] = (T)(img)(x,y,z,c)), \
   (I[2] = (T)(img)(x,_n1##y,z,c)), \
   (I[4] = (T)(img)(x,y,_n1##z,c)), \
   (I[6] = (T)(img)(x,_n1##y,_n1##z,c)), \
   x+1>=(int)(img)._width?(img).width()-1:x+1); \
   x<=(int)(x1) && ((_n1##x<(img).width() && ( \
   (I[1] = (T)(img)(_n1##x,y,z,c)), \
   (I[3] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[5] = (T)(img)(_n1##x,y,_n1##z,c)), \
   (I[7] = (T)(img)(_n1##x,_n1##y,_n1##z,c)),1)) || \
   x==--_n1##x); \
   I[0] = I[1], I[2] = I[3], I[4] = I[5], I[6] = I[7], \
   ++x, ++_n1##x)

#define cimg_for3x3x3(img,x,y,z,c,I,T) \
 cimg_for3((img)._depth,z) cimg_for3((img)._height,y) for (int x = 0, \
   _p1##x = 0, \
   _n1##x = (int)( \
   (I[0] = I[1] = (T)(img)(0,_p1##y,_p1##z,c)), \
   (I[3] = I[4] = (T)(img)(0,y,_p1##z,c)),  \
   (I[6] = I[7] = (T)(img)(0,_n1##y,_p1##z,c)), \
   (I[9] = I[10] = (T)(img)(0,_p1##y,z,c)), \
   (I[12] = I[13] = (T)(img)(0,y,z,c)), \
   (I[15] = I[16] = (T)(img)(0,_n1##y,z,c)), \
   (I[18] = I[19] = (T)(img)(0,_p1##y,_n1##z,c)), \
   (I[21] = I[22] = (T)(img)(0,y,_n1##z,c)), \
   (I[24] = I[25] = (T)(img)(0,_n1##y,_n1##z,c)), \
   1>=(img)._width?(img).width()-1:1); \
   (_n1##x<(img).width() && ( \
   (I[2] = (T)(img)(_n1##x,_p1##y,_p1##z,c)), \
   (I[5] = (T)(img)(_n1##x,y,_p1##z,c)), \
   (I[8] = (T)(img)(_n1##x,_n1##y,_p1##z,c)), \
   (I[11] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[14] = (T)(img)(_n1##x,y,z,c)), \
   (I[17] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[20] = (T)(img)(_n1##x,_p1##y,_n1##z,c)), \
   (I[23] = (T)(img)(_n1##x,y,_n1##z,c)), \
   (I[26] = (T)(img)(_n1##x,_n1##y,_n1##z,c)),1)) || \
   x==--_n1##x; \
   I[0] = I[1], I[1] = I[2], I[3] = I[4], I[4] = I[5], I[6] = I[7], I[7] = I[8], \
   I[9] = I[10], I[10] = I[11], I[12] = I[13], I[13] = I[14], I[15] = I[16], I[16] = I[17], \
   I[18] = I[19], I[19] = I[20], I[21] = I[22], I[22] = I[23], I[24] = I[25], I[25] = I[26], \
   _p1##x = x++, ++_n1##x)

#define cimg_for_in3x3x3(img,x0,y0,z0,x1,y1,z1,x,y,z,c,I,T) \
 cimg_for_in3((img)._depth,z0,z1,z) cimg_for_in3((img)._height,y0,y1,y) for (int x = (int)(x0)<0?0:(int)(x0), \
   _p1##x = x-1<0?0:x-1, \
   _n1##x = (int)( \
   (I[0] = (T)(img)(_p1##x,_p1##y,_p1##z,c)), \
   (I[3] = (T)(img)(_p1##x,y,_p1##z,c)),  \
   (I[6] = (T)(img)(_p1##x,_n1##y,_p1##z,c)), \
   (I[9] = (T)(img)(_p1##x,_p1##y,z,c)), \
   (I[12] = (T)(img)(_p1##x,y,z,c)), \
   (I[15] = (T)(img)(_p1##x,_n1##y,z,c)), \
   (I[18] = (T)(img)(_p1##x,_p1##y,_n1##z,c)), \
   (I[21] = (T)(img)(_p1##x,y,_n1##z,c)), \
   (I[24] = (T)(img)(_p1##x,_n1##y,_n1##z,c)), \
   (I[1] = (T)(img)(x,_p1##y,_p1##z,c)), \
   (I[4] = (T)(img)(x,y,_p1##z,c)),  \
   (I[7] = (T)(img)(x,_n1##y,_p1##z,c)), \
   (I[10] = (T)(img)(x,_p1##y,z,c)), \
   (I[13] = (T)(img)(x,y,z,c)), \
   (I[16] = (T)(img)(x,_n1##y,z,c)), \
   (I[19] = (T)(img)(x,_p1##y,_n1##z,c)), \
   (I[22] = (T)(img)(x,y,_n1##z,c)), \
   (I[25] = (T)(img)(x,_n1##y,_n1##z,c)), \
   x+1>=(int)(img)._width?(img).width()-1:x+1); \
   x<=(int)(x1) && ((_n1##x<(img).width() && ( \
   (I[2] = (T)(img)(_n1##x,_p1##y,_p1##z,c)), \
   (I[5] = (T)(img)(_n1##x,y,_p1##z,c)), \
   (I[8] = (T)(img)(_n1##x,_n1##y,_p1##z,c)), \
   (I[11] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[14] = (T)(img)(_n1##x,y,z,c)), \
   (I[17] = (T)(img)(_n1##x,_n1##y,z,c)), \
   (I[20] = (T)(img)(_n1##x,_p1##y,_n1##z,c)), \
   (I[23] = (T)(img)(_n1##x,y,_n1##z,c)), \
   (I[26] = (T)(img)(_n1##x,_n1##y,_n1##z,c)),1)) || \
   x==--_n1##x); \
   I[0] = I[1], I[1] = I[2], I[3] = I[4], I[4] = I[5], I[6] = I[7], I[7] = I[8], \
   I[9] = I[10], I[10] = I[11], I[12] = I[13], I[13] = I[14], I[15] = I[16], I[16] = I[17], \
   I[18] = I[19], I[19] = I[20], I[21] = I[22], I[22] = I[23], I[24] = I[25], I[25] = I[26], \
   _p1##x = x++, ++_n1##x)

#define cimglist_for(list,l) for (int l = 0; l<(int)(list)._width; ++l)
#define cimglist_for_in(list,l0,l1,l) \
  for (int l = (int)(l0)<0?0:(int)(l0), _max##l = (unsigned int)l1<(list)._width?(int)(l1):(int)(list)._width-1; l<=_max##l; ++l)

#define cimglist_apply(list,fn) cimglist_for(list,__##fn) (list)[__##fn].fn

// Define macros used when exceptions are thrown.
#define _cimgdisplay_instance "[instance(%u,%u,%u,%c%s%c)] CImgDisplay::"
#define cimgdisplay_instance _width,_height,_normalization,_title?'\"':'[',_title?_title:"untitled",_title?'\"':']'
#define _cimg_instance "[instance(%u,%u,%u,%u,%p,%sshared)] CImg<%s>::"
#define cimg_instance _width,_height,_depth,_spectrum,_data,_is_shared?"":"non-",pixel_type()
#define _cimglist_instance "[instance(%u,%u,%p)] CImgList<%s>::"
#define cimglist_instance _width,_allocated_width,_data,pixel_type()

/*------------------------------------------------
 #
 #
 #  Definition of the cimg_library:: namespace
 #
 #
 -------------------------------------------------*/
//! This namespace encompasses all classes and functions of the %CImg library.
/**
   This namespace is defined to avoid functions and class names collisions
   that could happen with the include of other C++ header files.
   Anyway, it should not happen often and you should reasonnably start most of your
   %CImg-based programs with
   \code
   #include "CImg.h"
   using namespace cimg_library;
   \endcode
   to simplify the declaration of %CImg Library variables afterwards.
**/
namespace cimg_library {

  // Declare the only four classes of the CImg Library.
  template<typename T=float> struct CImg;
  template<typename T=float> struct CImgList;
  struct CImgDisplay;
  struct CImgException;

  // (Pre)declare the cimg namespace.
  // This is not the complete namespace declaration. It only contains some
  // necessary stuffs to ensure a correct declaration order of classes and functions
  // defined afterwards.
  namespace cimg {

#ifdef cimg_use_vt100
    const char t_normal[] = { 0x1b, '[', '0', ';', '0', ';', '0', 'm', 0 };
    const char t_red[] = { 0x1b, '[', '4', ';', '3', '1', ';', '5', '9', 'm', 0 };
    const char t_bold[] = { 0x1b, '[', '1', 'm', 0 };
    const char t_purple[] = { 0x1b, '[', '0', ';', '3', '5', ';', '5', '9', 'm', 0 };
    const char t_green[] = { 0x1b, '[', '0', ';', '3', '2', ';', '5', '9', 'm', 0 };
#else
    const char t_normal[] = { 0 };
    const char *const t_red = cimg::t_normal, *const t_bold = cimg::t_normal,
      *const t_purple = cimg::t_normal, *const t_green = cimg::t_normal;
#endif

    inline std::FILE* output(std::FILE *file=0);
    inline void info();

    // Function used to avoid warning messages due to unused parameters.
    template<typename T>
    inline void unused(const T&, ...) {}

    //! Get/set the current CImg exception mode.
    /**
       The way error messages are handled by CImg can be changed dynamically, using this function.
       Possible values are :
       - '0' to hide library messages (quiet mode).
       - '1' to print library messages on the console.
       - '2' to display library messages on a dialog window (default behavior).
       - '3' to do as '1' + add extra warnings (may slow down the code !).
       - '4' to do as '2' + add extra warnings (may slow down the code !).
     **/
    inline unsigned int& _exception_mode(const unsigned int value, const bool is_set) {
      static unsigned int mode = cimg_verbosity;
      if (is_set) mode = value;
      return mode;
    }
    inline unsigned int& exception_mode() {
      return _exception_mode(0,false);
    }
    inline unsigned int& exception_mode(const unsigned int mode) {
      return _exception_mode(mode,true);
    }

    inline int dialog(const char *const title, const char *const msg, const char *const button1_label="OK",
                      const char *const button2_label=0, const char *const button3_label=0,
                      const char *const button4_label=0, const char *const button5_label=0,
                      const char *const button6_label=0, const bool centering=false);

    //! Evaluate math expression.
    inline double eval(const char *const expression, const double x=0, const double y=0, const double z=0, const double v=0);
  }

  /*----------------------------------------------
   #
   # Definition of the CImgException structures
   #
   ----------------------------------------------*/
  //! Instances of this class are thrown when errors occur during a %CImg library function call.
  /**
     \section ex1 Overview

      CImgException is the base class of %CImg exceptions.
      Exceptions are thrown by the %CImg Library when an error occured in a %CImg library function call.
      CImgException is seldom thrown itself. Children classes that specify the kind of error encountered
      are generally used instead. These sub-classes are :

      - \b CImgInstanceException : Thrown when the instance associated to the called %CImg function is not
      correctly defined. Generally, this exception is thrown when one tries to process \a empty images. The example
      below will throw a \a CImgInstanceException.
      \code
      CImg<float> img;        // Construct an empty image.
      img.blur(10);           // Try to blur the image.
      \endcode

      - \b CImgArgumentException : Thrown when one of the arguments given to the called %CImg function is not correct.
      Generally, this exception is thrown when arguments passed to the function are outside an admissible range of values.
      The example below will throw a \a CImgArgumentException.
      \code
      CImg<float> img(100,100,1,3);   // Define a 100x100 color image with float pixels.
      img = 0;                     // Try to fill pixels from the 0 pointer (invalid argument to operator=() ).
      \endcode

      - \b CImgIOException : Thrown when an error occured when trying to load or save image files.
      The example below will throw a \a CImgIOException.
      \code
      CImg<float> img("file_doesnt_exist.jpg");    // Try to load a file that doesn't exist.
      \endcode

      The parent class CImgException may be thrown itself when errors that cannot be classified in one of
      the above type occur. It is recommended not to throw CImgExceptions yourself, since there are normally
      reserved to %CImg Library functions.
      \b CImgInstanceException, \b CImgArgumentException and \b CImgIOException are simple
      subclasses of CImgException and are thus not detailled more in this reference documentation.

      \section ex2 Exception handling

      When an error occurs, the %CImg Library first displays the error in a modal window.
      Then, it throws an instance of the corresponding exception class, generally leading the program to stop
      (this is the default behavior).
      You can bypass this default behavior by handling the exceptions yourself,
      using a code block <tt>try { ... } catch () { ... }</tt>.
      In this case, you can avoid the apparition of the modal window, by
      defining the environment variable <tt>cimg_verbosity</tt> to 0 before including the %CImg header file.
      The example below shows how to cleanly handle %CImg Library exceptions :
      \code
      #define cimg_verbosity 0     // Disable modal window in CImg exceptions.
      #define "CImg.h"
      int main() {
        try {
          ...; // Here, do what you want.
        }
        catch (CImgInstanceException &e) {
          std::fprintf(stderr,"CImg Library Error : %s",e.what());  // Display your own error message
          ...                                                       // Do what you want now.
        }
      }
      \endcode
  **/
  struct CImgException : public std::exception {
#define _cimg_exception_err(etype,disp_flag) \
  std::va_list ap; va_start(ap,format); cimg_vsnprintf(_message,sizeof(_message),format,ap); va_end(ap); \
  if (cimg::exception_mode()) { \
    std::fprintf(cimg::output(),"\n%s[CImg] *** %s ***%s %s\n",cimg::t_red,etype,cimg::t_normal,_message); \
    if (cimg_display && !(cimg::exception_mode()%2)) try { cimg::dialog(etype,_message,"Abort"); } catch (CImgException&) {} \
    if (cimg::exception_mode()>=3) cimg_library::cimg::info(); \
  }

    char _message[16384];
    CImgException() { *_message = 0; }
    CImgException(const char *const format, ...) { _cimg_exception_err("CImgException",true); }
    const char *what() const throw() { return _message; }
  };

  // The \ref CImgInstanceException class is used to throw an exception related
  // to a non suitable instance encountered in a library function call.
  struct CImgInstanceException : public CImgException {
    CImgInstanceException(const char *const format, ...) { _cimg_exception_err("CImgInstanceException",true); }
  };

  // The \ref CImgArgumentException class is used to throw an exception related
  // to invalid arguments encountered in a library function call.
  struct CImgArgumentException : public CImgException {
    CImgArgumentException(const char *const format, ...) { _cimg_exception_err("CImgArgumentException",true); }
  };

  // The \ref CImgIOException class is used to throw an exception related
  // to Input/Output file problems encountered in a library function call.
  struct CImgIOException : public CImgException {
    CImgIOException(const char *const format, ...) { _cimg_exception_err("CImgIOException",true); }
  };

  // The CImgWarningException class is used to throw an exception for warnings
  // encountered in a library function call.
  struct CImgWarningException : public CImgException {
    CImgWarningException(const char *const format, ...) { _cimg_exception_err("CImgWarningException",false); }
  };

  /*-------------------------------------
   #
   # Definition of the namespace 'cimg'
   #
   --------------------------------------*/
  //! Namespace that encompasses \a low-level functions and variables of the %CImg Library.
  /**
     Most of the functions and variables within this namespace are used by the library for low-level processing.
     Nevertheless, documented variables and functions of this namespace may be used safely in your own source code.

     \warning Never write <tt>using namespace cimg_library::cimg;</tt> in your source code, since a lot of functions of the
     <tt>cimg::</tt> namespace have prototypes similar to standard C functions that could defined in the global namespace <tt>::</tt>.
  **/
  namespace cimg {

    // Define the traits that will be used to determine the best data type to work with.
    //
    template<typename T> struct type {
      static const char* string() {
        static const char* s[] = { "unknown",   "unknown8",   "unknown16",  "unknown24",
                                   "unknown32", "unknown40",  "unknown48",  "unknown56",
                                   "unknown64", "unknown72",  "unknown80",  "unknown88",
                                   "unknown96", "unknown104", "unknown112", "unknown120",
                                   "unknown128" };
        return s[(sizeof(T)<17)?sizeof(T):0];
      }
      static unsigned int id() { return 0U; }
      static bool is_float() { return false; }
      static T min() { return (T)-1>0?(T)0:(T)-1<<(8*sizeof(T)-1); }
      static T max() { return (T)-1>0?(T)-1:~((T)-1<<(8*sizeof(T)-1)); }
      static T cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(T)val; }
      static const char* format() { return "%s"; }
      static const char* format(const T val) { static const char *const s = "unknown"; return s; }
    };

    template<> struct type<bool> {
      static const char* string() { static const char *const s = "bool"; return s; }
      static unsigned int id() { return 1U; }
      static bool is_float() { return false; }
      static bool min() { return false; }
      static bool max() { return true; }
      static bool cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(bool)val; }
      static const char* format() { return "%s"; }
      static const char* format(const bool val) { static const char* s[] = { "false", "true" }; return s[val?1:0]; }
    };

    template<> struct type<unsigned char> {
      static const char* string() { static const char *const s = "unsigned char"; return s; }
      static unsigned int id() { return 2U; }
      static bool is_float() { return false; }
      static unsigned char min() { return 0; }
      static unsigned char max() { return (unsigned char)~0U; }
      static unsigned char cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(unsigned char)val; }
      static const char* format() { return "%u"; }
      static unsigned int format(const unsigned char val) { return (unsigned int)val; }
    };

    template<> struct type<char> {
      static const char* string() { static const char *const s = "char"; return s; }
      static unsigned int id() { return 3U; }
      static bool is_float() { return false; }
      static char min() { return (char)(-1L<<(8*sizeof(char)-1)); }
      static char max() { return ~((char)(-1L<<(8*sizeof(char)-1))); }
      static char cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(char)val; }
      static const char* format() { return "%d"; }
      static int format(const char val) { return (int)val; }
    };

    template<> struct type<signed char> {
      static const char* string() { static const char *const s = "signed char"; return s; }
      static unsigned int id() { return 4U; }
      static bool is_float() { return false; }
      static signed char min() { return (signed char)(-1L<<(8*sizeof(signed char)-1)); }
      static signed char max() { return ~((signed char)(-1L<<(8*sizeof(signed char)-1))); }
      static signed char cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(signed char)val; }
      static const char* format() { return "%d"; }
      static unsigned int format(const signed char val) { return (int)val; }
    };

    template<> struct type<unsigned short> {
      static const char* string() { static const char *const s = "unsigned short"; return s; }
      static unsigned int id() { return 5U; }
      static bool is_float() { return false; }
      static unsigned short min() { return 0; }
      static unsigned short max() { return (unsigned short)~0U; }
      static unsigned short cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(unsigned short)val; }
      static const char* format() { return "%u"; }
      static unsigned int format(const unsigned short val) { return (unsigned int)val; }
    };

    template<> struct type<short> {
      static const char* string() { static const char *const s = "short"; return s; }
      static unsigned int id() { return 6U; }
      static bool is_float() { return false; }
      static short min() { return (short)(-1L<<(8*sizeof(short)-1)); }
      static short max() { return ~((short)(-1L<<(8*sizeof(short)-1))); }
      static short cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(short)val; }
      static const char* format() { return "%d"; }
      static int format(const short val) { return (int)val; }
    };

    template<> struct type<unsigned int> {
      static const char* string() { static const char *const s = "unsigned int"; return s; }
      static unsigned int id() { return 7U; }
      static bool is_float() { return false; }
      static unsigned int min() { return 0; }
      static unsigned int max() { return (unsigned int)~0U; }
      static unsigned int cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(unsigned int)val; }
      static const char* format() { return "%u"; }
      static unsigned int format(const unsigned int val) { return val; }
    };

    template<> struct type<int> {
      static const char* string() { static const char *const s = "int"; return s; }
      static unsigned int id() { return 8U; }
      static bool is_float() { return false; }
      static int min() { return (int)(-1L<<(8*sizeof(int)-1)); }
      static int max() { return ~((int)(-1L<<(8*sizeof(int)-1))); }
      static int cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(int)val; }
      static const char* format() { return "%d"; }
      static int format(const int val) { return val; }
    };

    template<> struct type<unsigned long> {
      static const char* string() { static const char *const s = "unsigned long"; return s; }
      static unsigned int id() { return 9U; }
      static bool is_float() { return false; }
      static unsigned long min() { return 0; }
      static unsigned long max() { return (unsigned long)~0UL; }
      static unsigned long cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(unsigned long)val; }
      static const char* format() { return "%lu"; }
      static unsigned long format(const unsigned long val) { return val; }
    };

    template<> struct type<long> {
      static const char* string() { static const char *const s = "long"; return s; }
      static unsigned int id() { return 10U; }
      static bool is_float() { return false; }
      static long min() { return (long)(-1L<<(8*sizeof(long)-1)); }
      static long max() { return ~((long)(-1L<<(8*sizeof(long)-1))); }
      static long cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(long)val; }
      static const char* format() { return "%ld"; }
      static long format(const long val) { return val; }
    };

    template<> struct type<double> {
      static const char* string() { static const char *const s = "double"; return s; }
      static unsigned int id() { return 11U; }
      static bool is_float() { return true; }
      static double min() { return -1.7E308; }
      static double max() { return  1.7E308; }
      static double cut(const double val) { return val<min()?min():val>max()?max():val; }
      static double inf() { return max()*max(); }
      static double nan() { static const double v_nan = std::sqrt(-1.0); return v_nan; }
      static const char* format() { return "%g"; }
      static double format(const double val) { return val; }
    };

    template<> struct type<float> {
      static const char* string() { static const char *const s = "float"; return s; }
      static unsigned int id() { return 12U; }
      static bool is_float() { return true; }
      static float min() { return -3.4E38f; }
      static float max() { return  3.4E38f; }
      static float cut(const double val) { return val<(double)min()?min():val>(double)max()?max():(float)val; }
      static float inf() { return (float)cimg::type<double>::inf(); }
      static float nan() { return (float)cimg::type<double>::nan(); }
      static const char* format() { return "%g"; }
      static double format(const float val) { return (double)val; }
    };

    template<typename T, typename t> struct superset { typedef T type; };
    template<> struct superset<bool,unsigned char> { typedef unsigned char type; };
    template<> struct superset<bool,char> { typedef char type; };
    template<> struct superset<bool,signed char> { typedef signed char type; };
    template<> struct superset<bool,unsigned short> { typedef unsigned short type; };
    template<> struct superset<bool,short> { typedef short type; };
    template<> struct superset<bool,unsigned int> { typedef unsigned int type; };
    template<> struct superset<bool,int> { typedef int type; };
    template<> struct superset<bool,unsigned long> { typedef unsigned long type; };
    template<> struct superset<bool,long> { typedef long type; };
    template<> struct superset<bool,float> { typedef float type; };
    template<> struct superset<bool,double> { typedef double type; };
    template<> struct superset<unsigned char,char> { typedef short type; };
    template<> struct superset<unsigned char,signed char> { typedef short type; };
    template<> struct superset<unsigned char,unsigned short> { typedef unsigned short type; };
    template<> struct superset<unsigned char,short> { typedef short type; };
    template<> struct superset<unsigned char,unsigned int> { typedef unsigned int type; };
    template<> struct superset<unsigned char,int> { typedef int type; };
    template<> struct superset<unsigned char,unsigned long> { typedef unsigned long type; };
    template<> struct superset<unsigned char,long> { typedef long type; };
    template<> struct superset<unsigned char,float> { typedef float type; };
    template<> struct superset<unsigned char,double> { typedef double type; };
    template<> struct superset<signed char,unsigned char> { typedef short type; };
    template<> struct superset<signed char,char> { typedef short type; };
    template<> struct superset<signed char,unsigned short> { typedef int type; };
    template<> struct superset<signed char,short> { typedef short type; };
    template<> struct superset<signed char,unsigned int> { typedef long type; };
    template<> struct superset<signed char,int> { typedef int type; };
    template<> struct superset<signed char,unsigned long> { typedef long type; };
    template<> struct superset<signed char,long> { typedef long type; };
    template<> struct superset<signed char,float> { typedef float type; };
    template<> struct superset<signed char,double> { typedef double type; };
    template<> struct superset<char,unsigned char> { typedef short type; };
    template<> struct superset<char,signed char> { typedef short type; };
    template<> struct superset<char,unsigned short> { typedef int type; };
    template<> struct superset<char,short> { typedef short type; };
    template<> struct superset<char,unsigned int> { typedef long type; };
    template<> struct superset<char,int> { typedef int type; };
    template<> struct superset<char,unsigned long> { typedef long type; };
    template<> struct superset<char,long> { typedef long type; };
    template<> struct superset<char,float> { typedef float type; };
    template<> struct superset<char,double> { typedef double type; };
    template<> struct superset<unsigned short,char> { typedef int type; };
    template<> struct superset<unsigned short,signed char> { typedef int type; };
    template<> struct superset<unsigned short,short> { typedef int type; };
    template<> struct superset<unsigned short,unsigned int> { typedef unsigned int type; };
    template<> struct superset<unsigned short,int> { typedef int type; };
    template<> struct superset<unsigned short,unsigned long> { typedef unsigned long type; };
    template<> struct superset<unsigned short,long> { typedef long type; };
    template<> struct superset<unsigned short,float> { typedef float type; };
    template<> struct superset<unsigned short,double> { typedef double type; };
    template<> struct superset<short,unsigned short> { typedef int type; };
    template<> struct superset<short,unsigned int> { typedef long type; };
    template<> struct superset<short,int> { typedef int type; };
    template<> struct superset<short,unsigned long> { typedef long type; };
    template<> struct superset<short,long> { typedef long type; };
    template<> struct superset<short,float> { typedef float type; };
    template<> struct superset<short,double> { typedef double type; };
    template<> struct superset<unsigned int,char> { typedef long type; };
    template<> struct superset<unsigned int,signed char> { typedef long type; };
    template<> struct superset<unsigned int,short> { typedef long type; };
    template<> struct superset<unsigned int,int> { typedef long type; };
    template<> struct superset<unsigned int,unsigned long> { typedef unsigned long type; };
    template<> struct superset<unsigned int,long> { typedef long type; };
    template<> struct superset<unsigned int,float> { typedef float type; };
    template<> struct superset<unsigned int,double> { typedef double type; };
    template<> struct superset<int,unsigned int> { typedef long type; };
    template<> struct superset<int,unsigned long> { typedef long type; };
    template<> struct superset<int,long> { typedef long type; };
    template<> struct superset<int,float> { typedef float type; };
    template<> struct superset<int,double> { typedef double type; };
    template<> struct superset<unsigned long,char> { typedef long type; };
    template<> struct superset<unsigned long,signed char> { typedef long type; };
    template<> struct superset<unsigned long,short> { typedef long type; };
    template<> struct superset<unsigned long,int> { typedef long type; };
    template<> struct superset<unsigned long,long> { typedef long type; };
    template<> struct superset<unsigned long,float> { typedef float type; };
    template<> struct superset<unsigned long,double> { typedef double type; };
    template<> struct superset<long,float> { typedef float type; };
    template<> struct superset<long,double> { typedef double type; };
    template<> struct superset<float,double> { typedef double type; };

    template<typename t1, typename t2, typename t3> struct superset2 {
      typedef typename superset<t1, typename superset<t2,t3>::type>::type type;
    };

    template<typename t1, typename t2, typename t3, typename t4> struct superset3 {
      typedef typename superset<t1, typename superset2<t2,t3,t4>::type>::type type;
    };

    template<typename t1, typename t2> struct last { typedef t2 type; };

#define _cimg_Tt      typename cimg::superset<T,t>::type
#define _cimg_Tfloat  typename cimg::superset<T,float>::type
#define _cimg_Ttfloat typename cimg::superset2<T,t,float>::type

    // Define internal library variables.
#if cimg_display==1
    struct X11_info {
      volatile unsigned int nb_wins;
      pthread_t*       event_thread;
      CImgDisplay*     wins[1024];
      Display*         display;
      unsigned int     nb_bits;
      bool             is_blue_first;
      bool             is_shm_enabled;
      bool             byte_order;
#ifdef cimg_use_xrandr
      XRRScreenSize *resolutions;
      Rotation curr_rotation;
      unsigned int curr_resolution;
      unsigned int nb_resolutions;
#endif
      X11_info():nb_wins(0),event_thread(0),display(0),
                 nb_bits(0),is_blue_first(false),is_shm_enabled(false),byte_order(false) {
#ifdef cimg_use_xrandr
        resolutions = 0;
        curr_rotation = 0;
        curr_resolution = nb_resolutions = 0;
#endif
      }
    };
#if defined(cimg_module)
    X11_info& X11_attr();
#elif defined(cimg_main)
    X11_info& X11_attr() { static X11_info val; return val; }
#else
    inline X11_info& X11_attr() { static X11_info val; return val; }
#endif

#elif cimg_display==2
    struct Win32_info {
      HANDLE wait_event;
      Win32_info() { wait_event = CreateEvent(0,FALSE,FALSE,0); }
    };
#if defined(cimg_module)
    Win32_info& Win32_attr();
#elif defined(cimg_main)
    Win32_info& Win32_attr() { static Win32_info val; return val; }
#else
    inline Win32_info& Win32_attr() { static Win32_info val; return val; }
#endif
#endif

#if defined(cimg_use_magick)
    static struct Magick_info {
      Magick_info() {
        Magick::InitializeMagick("");
      }
    } _Magick_info;
#endif

#if cimg_display==1
    // Keycodes for X11-based graphical systems.
    const unsigned int keyESC        = XK_Escape;
    const unsigned int keyF1         = XK_F1;
    const unsigned int keyF2         = XK_F2;
    const unsigned int keyF3         = XK_F3;
    const unsigned int keyF4         = XK_F4;
    const unsigned int keyF5         = XK_F5;
    const unsigned int keyF6         = XK_F6;
    const unsigned int keyF7         = XK_F7;
    const unsigned int keyF8         = XK_F8;
    const unsigned int keyF9         = XK_F9;
    const unsigned int keyF10        = XK_F10;
    const unsigned int keyF11        = XK_F11;
    const unsigned int keyF12        = XK_F12;
    const unsigned int keyPAUSE      = XK_Pause;
    const unsigned int key1          = XK_1;
    const unsigned int key2          = XK_2;
    const unsigned int key3          = XK_3;
    const unsigned int key4          = XK_4;
    const unsigned int key5          = XK_5;
    const unsigned int key6          = XK_6;
    const unsigned int key7          = XK_7;
    const unsigned int key8          = XK_8;
    const unsigned int key9          = XK_9;
    const unsigned int key0          = XK_0;
    const unsigned int keyBACKSPACE  = XK_BackSpace;
    const unsigned int keyINSERT     = XK_Insert;
    const unsigned int keyHOME       = XK_Home;
    const unsigned int keyPAGEUP     = XK_Page_Up;
    const unsigned int keyTAB        = XK_Tab;
    const unsigned int keyQ          = XK_q;
    const unsigned int keyW          = XK_w;
    const unsigned int keyE          = XK_e;
    const unsigned int keyR          = XK_r;
    const unsigned int keyT          = XK_t;
    const unsigned int keyY          = XK_y;
    const unsigned int keyU          = XK_u;
    const unsigned int keyI          = XK_i;
    const unsigned int keyO          = XK_o;
    const unsigned int keyP          = XK_p;
    const unsigned int keyDELETE     = XK_Delete;
    const unsigned int keyEND        = XK_End;
    const unsigned int keyPAGEDOWN   = XK_Page_Down;
    const unsigned int keyCAPSLOCK   = XK_Caps_Lock;
    const unsigned int keyA          = XK_a;
    const unsigned int keyS          = XK_s;
    const unsigned int keyD          = XK_d;
    const unsigned int keyF          = XK_f;
    const unsigned int keyG          = XK_g;
    const unsigned int keyH          = XK_h;
    const unsigned int keyJ          = XK_j;
    const unsigned int keyK          = XK_k;
    const unsigned int keyL          = XK_l;
    const unsigned int keyENTER      = XK_Return;
    const unsigned int keySHIFTLEFT  = XK_Shift_L;
    const unsigned int keyZ          = XK_z;
    const unsigned int keyX          = XK_x;
    const unsigned int keyC          = XK_c;
    const unsigned int keyV          = XK_v;
    const unsigned int keyB          = XK_b;
    const unsigned int keyN          = XK_n;
    const unsigned int keyM          = XK_m;
    const unsigned int keySHIFTRIGHT = XK_Shift_R;
    const unsigned int keyARROWUP    = XK_Up;
    const unsigned int keyCTRLLEFT   = XK_Control_L;
    const unsigned int keyAPPLEFT    = XK_Super_L;
    const unsigned int keyALT        = XK_Alt_L;
    const unsigned int keySPACE      = XK_space;
    const unsigned int keyALTGR      = XK_Alt_R;
    const unsigned int keyAPPRIGHT   = XK_Super_R;
    const unsigned int keyMENU       = XK_Menu;
    const unsigned int keyCTRLRIGHT  = XK_Control_R;
    const unsigned int keyARROWLEFT  = XK_Left;
    const unsigned int keyARROWDOWN  = XK_Down;
    const unsigned int keyARROWRIGHT = XK_Right;
    const unsigned int keyPAD0       = XK_KP_0;
    const unsigned int keyPAD1       = XK_KP_1;
    const unsigned int keyPAD2       = XK_KP_2;
    const unsigned int keyPAD3       = XK_KP_3;
    const unsigned int keyPAD4       = XK_KP_4;
    const unsigned int keyPAD5       = XK_KP_5;
    const unsigned int keyPAD6       = XK_KP_6;
    const unsigned int keyPAD7       = XK_KP_7;
    const unsigned int keyPAD8       = XK_KP_8;
    const unsigned int keyPAD9       = XK_KP_9;
    const unsigned int keyPADADD     = XK_KP_Add;
    const unsigned int keyPADSUB     = XK_KP_Subtract;
    const unsigned int keyPADMUL     = XK_KP_Multiply;
    const unsigned int keyPADDIV     = XK_KP_Divide;

#elif cimg_display==2
    // Keycodes for Windows.
    const unsigned int keyESC        = VK_ESCAPE;
    const unsigned int keyF1         = VK_F1;
    const unsigned int keyF2         = VK_F2;
    const unsigned int keyF3         = VK_F3;
    const unsigned int keyF4         = VK_F4;
    const unsigned int keyF5         = VK_F5;
    const unsigned int keyF6         = VK_F6;
    const unsigned int keyF7         = VK_F7;
    const unsigned int keyF8         = VK_F8;
    const unsigned int keyF9         = VK_F9;
    const unsigned int keyF10        = VK_F10;
    const unsigned int keyF11        = VK_F11;
    const unsigned int keyF12        = VK_F12;
    const unsigned int keyPAUSE      = VK_PAUSE;
    const unsigned int key1          = '1';
    const unsigned int key2          = '2';
    const unsigned int key3          = '3';
    const unsigned int key4          = '4';
    const unsigned int key5          = '5';
    const unsigned int key6          = '6';
    const unsigned int key7          = '7';
    const unsigned int key8          = '8';
    const unsigned int key9          = '9';
    const unsigned int key0          = '0';
    const unsigned int keyBACKSPACE  = VK_BACK;
    const unsigned int keyINSERT     = VK_INSERT;
    const unsigned int keyHOME       = VK_HOME;
    const unsigned int keyPAGEUP     = VK_PRIOR;
    const unsigned int keyTAB        = VK_TAB;
    const unsigned int keyQ          = 'Q';
    const unsigned int keyW          = 'W';
    const unsigned int keyE          = 'E';
    const unsigned int keyR          = 'R';
    const unsigned int keyT          = 'T';
    const unsigned int keyY          = 'Y';
    const unsigned int keyU          = 'U';
    const unsigned int keyI          = 'I';
    const unsigned int keyO          = 'O';
    const unsigned int keyP          = 'P';
    const unsigned int keyDELETE     = VK_DELETE;
    const unsigned int keyEND        = VK_END;
    const unsigned int keyPAGEDOWN   = VK_NEXT;
    const unsigned int keyCAPSLOCK   = VK_CAPITAL;
    const unsigned int keyA          = 'A';
    const unsigned int keyS          = 'S';
    const unsigned int keyD          = 'D';
    const unsigned int keyF          = 'F';
    const unsigned int keyG          = 'G';
    const unsigned int keyH          = 'H';
    const unsigned int keyJ          = 'J';
    const unsigned int keyK          = 'K';
    const unsigned int keyL          = 'L';
    const unsigned int keyENTER      = VK_RETURN;
    const unsigned int keySHIFTLEFT  = VK_SHIFT;
    const unsigned int keyZ          = 'Z';
    const unsigned int keyX          = 'X';
    const unsigned int keyC          = 'C';
    const unsigned int keyV          = 'V';
    const unsigned int keyB          = 'B';
    const unsigned int keyN          = 'N';
    const unsigned int keyM          = 'M';
    const unsigned int keySHIFTRIGHT = VK_SHIFT;
    const unsigned int keyARROWUP    = VK_UP;
    const unsigned int keyCTRLLEFT   = VK_CONTROL;
    const unsigned int keyAPPLEFT    = VK_LWIN;
    const unsigned int keyALT        = VK_LMENU;
    const unsigned int keySPACE      = VK_SPACE;
    const unsigned int keyALTGR      = VK_CONTROL;
    const unsigned int keyAPPRIGHT   = VK_RWIN;
    const unsigned int keyMENU       = VK_APPS;
    const unsigned int keyCTRLRIGHT  = VK_CONTROL;
    const unsigned int keyARROWLEFT  = VK_LEFT;
    const unsigned int keyARROWDOWN  = VK_DOWN;
    const unsigned int keyARROWRIGHT = VK_RIGHT;
    const unsigned int keyPAD0       = 0x60;
    const unsigned int keyPAD1       = 0x61;
    const unsigned int keyPAD2       = 0x62;
    const unsigned int keyPAD3       = 0x63;
    const unsigned int keyPAD4       = 0x64;
    const unsigned int keyPAD5       = 0x65;
    const unsigned int keyPAD6       = 0x66;
    const unsigned int keyPAD7       = 0x67;
    const unsigned int keyPAD8       = 0x68;
    const unsigned int keyPAD9       = 0x69;
    const unsigned int keyPADADD     = VK_ADD;
    const unsigned int keyPADSUB     = VK_SUBTRACT;
    const unsigned int keyPADMUL     = VK_MULTIPLY;
    const unsigned int keyPADDIV     = VK_DIVIDE;

#else
    // Define unknow keycodes when no display are available.
    // (should rarely be used then !).
    const unsigned int keyESC        = 1U;
    const unsigned int keyF1         = 2U;
    const unsigned int keyF2         = 3U;
    const unsigned int keyF3         = 4U;
    const unsigned int keyF4         = 5U;
    const unsigned int keyF5         = 6U;
    const unsigned int keyF6         = 7U;
    const unsigned int keyF7         = 8U;
    const unsigned int keyF8         = 9U;
    const unsigned int keyF9         = 10U;
    const unsigned int keyF10        = 11U;
    const unsigned int keyF11        = 12U;
    const unsigned int keyF12        = 13U;
    const unsigned int keyPAUSE      = 14U;
    const unsigned int key1          = 15U;
    const unsigned int key2          = 16U;
    const unsigned int key3          = 17U;
    const unsigned int key4          = 18U;
    const unsigned int key5          = 19U;
    const unsigned int key6          = 20U;
    const unsigned int key7          = 21U;
    const unsigned int key8          = 22U;
    const unsigned int key9          = 23U;
    const unsigned int key0          = 24U;
    const unsigned int keyBACKSPACE  = 25U;
    const unsigned int keyINSERT     = 26U;
    const unsigned int keyHOME       = 27U;
    const unsigned int keyPAGEUP     = 28U;
    const unsigned int keyTAB        = 29U;
    const unsigned int keyQ          = 30U;
    const unsigned int keyW          = 31U;
    const unsigned int keyE          = 32U;
    const unsigned int keyR          = 33U;
    const unsigned int keyT          = 34U;
    const unsigned int keyY          = 35U;
    const unsigned int keyU          = 36U;
    const unsigned int keyI          = 37U;
    const unsigned int keyO          = 38U;
    const unsigned int keyP          = 39U;
    const unsigned int keyDELETE     = 40U;
    const unsigned int keyEND        = 41U;
    const unsigned int keyPAGEDOWN   = 42U;
    const unsigned int keyCAPSLOCK   = 43U;
    const unsigned int keyA          = 44U;
    const unsigned int keyS          = 45U;
    const unsigned int keyD          = 46U;
    const unsigned int keyF          = 47U;
    const unsigned int keyG          = 48U;
    const unsigned int keyH          = 49U;
    const unsigned int keyJ          = 50U;
    const unsigned int keyK          = 51U;
    const unsigned int keyL          = 52U;
    const unsigned int keyENTER      = 53U;
    const unsigned int keySHIFTLEFT  = 54U;
    const unsigned int keyZ          = 55U;
    const unsigned int keyX          = 56U;
    const unsigned int keyC          = 57U;
    const unsigned int keyV          = 58U;
    const unsigned int keyB          = 59U;
    const unsigned int keyN          = 60U;
    const unsigned int keyM          = 61U;
    const unsigned int keySHIFTRIGHT = 62U;
    const unsigned int keyARROWUP    = 63U;
    const unsigned int keyCTRLLEFT   = 64U;
    const unsigned int keyAPPLEFT    = 65U;
    const unsigned int keyALT        = 66U;
    const unsigned int keySPACE      = 67U;
    const unsigned int keyALTGR      = 68U;
    const unsigned int keyAPPRIGHT   = 69U;
    const unsigned int keyMENU       = 70U;
    const unsigned int keyCTRLRIGHT  = 71U;
    const unsigned int keyARROWLEFT  = 72U;
    const unsigned int keyARROWDOWN  = 73U;
    const unsigned int keyARROWRIGHT = 74U;
    const unsigned int keyPAD0       = 75U;
    const unsigned int keyPAD1       = 76U;
    const unsigned int keyPAD2       = 77U;
    const unsigned int keyPAD3       = 78U;
    const unsigned int keyPAD4       = 79U;
    const unsigned int keyPAD5       = 80U;
    const unsigned int keyPAD6       = 81U;
    const unsigned int keyPAD7       = 82U;
    const unsigned int keyPAD8       = 83U;
    const unsigned int keyPAD9       = 84U;
    const unsigned int keyPADADD     = 85U;
    const unsigned int keyPADSUB     = 86U;
    const unsigned int keyPADMUL     = 87U;
    const unsigned int keyPADDIV     = 88U;
#endif

    const double PI = 3.14159265358979323846;   //!< Definition of the mathematical constant PI

    // Definition of a 10x13 font (small size).
    const unsigned int font10x13[256*10*13/32] = {
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x80100c0,
      0x68000300,0x801,0xc00010,0x100c000,0x68100,0x100c0680,0x2,0x403000,0x1000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xfc,0x0,0x0,0x0,0x0,0x0,0x4020120,
      0x58120480,0x402,0x1205008,0x2012050,0x58080,0x20120581,0x40000001,0x804812,0x2000000,0x0,0x300,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x140,0x80000,0x200402,0x800000,0x10,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x7010,0x7000000,0x8000200,0x20000,0xc0002000,0x8008,0x0,0x0,0x0,0x0,0x808,0x4000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x80000000,0x0,0x0,0x0,0x40000,0x0,0x0,0x0,0x0,0x480,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x70,0x80100c0,0x68000480,0x1001,
      0xc00010,0x1018000,0x68100,0x100c0680,0x4,0x403000,0x1020000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20140,0x28081883,0x200801,
      0x2a00000,0x10,0x1c0201c0,0x70040f80,0xc0f81c07,0x0,0x70,0x3e0303c0,0x3c3c0f83,0xe03c2107,0xe08810,0x18c31070,0x3c0703c0,
      0x783e0842,0x22222208,0x83e04010,0x1008000,0x4000200,0x20001,0x2002,0x408008,0x0,0x0,0x100000,0x0,0x1008,0x2000000,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20080,0x38000880,0x8078140f,0x81c00000,0x3e000,0xc020180,0x60080001,0xe0000002,0xc00042,0x108e2010,
      0xc0300c0,0x300c0303,0xf83c3e0f,0x83e0f81c,0x701c070,0x3c0c41c0,0x701c0701,0xc0001d08,0x42108421,0x8820088,0x4020120,0x58140480,
      0x802,0x1205008,0x3014050,0xc058080,0x20120581,0x40000002,0x804814,0x2020050,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20140,
      0x281e2484,0x80200801,0x1c02000,0x10,0x22060220,0x880c0801,0x82208,0x80000001,0x20008,0x41030220,0x40220802,0x402102,0x209010,
      0x18c31088,0x22088220,0x80080842,0x22222208,0x80204010,0x1014000,0x200,0x20001,0x2000,0x8008,0x0,0x0,0x100000,0x0,0x1008,
      0x2000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x80,0x40000500,0x80800010,0x40200000,0x41000,0x12020040,0x10000003,0xa0000006,
      0x12000c4,0x31014000,0xc0300c0,0x300c0302,0x80402008,0x2008008,0x2008020,0x220c4220,0x88220882,0x20002208,0x42108421,0x8820088,
      0x0,0x300,0x0,0x0,0x0,0x14000000,0x0,0x200200,0x0,0x20000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20000,0xfc282504,0x80001000,
      0x82a02000,0x20,0x22020020,0x8140802,0x102208,0x80801006,0x18008,0x9c848220,0x80210802,0x802102,0x20a010,0x15429104,0x22104220,
      0x80080842,0x22221405,0x404008,0x1022000,0x703c0,0x381e0701,0xc0783c02,0xc09008,0x1d83c070,0x3c078140,0x381c0882,0x21242208,
      0x81e01008,0x2000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x201e0,0x40220500,0x80800027,0x20e02800,0x9c800,0x12020040,
      0x20000883,0xa0200002,0x120a044,0x11064010,0x12048120,0x48120484,0x80802008,0x2008008,0x2008020,0x210a4411,0x4411044,0x10884508,
      0x42108421,0x503c0b0,0x1c0701c0,0x701c0707,0x70381c07,0x1c07008,0x2008020,0x20f01c0,0x701c0701,0xc0201c08,0x82208822,0x883c088,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20000,0x50281903,0x20001000,0x80802000,0x20,0x22020040,0x30240f03,0xc0101c08,0x80801018,
      0x1fc06010,0xa48483c0,0x80210f03,0xe0803f02,0x20c010,0x15429104,0x22104220,0x70080841,0x41540805,0x804008,0x1041000,0x8220,
      0x40220881,0x882202,0x40a008,0x12422088,0x22088180,0x40100882,0x21241408,0x80201008,0x2031000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x20280,0x401c0200,0x700028,0x21205000,0x92800,0xc1fc080,0x10000883,0xa0200002,0x1205049,0x12c19010,0x12048120,0x48120484,
      0xf0803c0f,0x3c0f008,0x2008020,0x790a4411,0x4411044,0x10504908,0x42108421,0x5022088,0x2008020,0x8020080,0x88402208,0x82208808,
      0x2008020,0x1e088220,0x88220882,0x20002608,0x82208822,0x8822088,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20000,0x501c0264,
      0xa0001000,0x8001fc00,0x7000020,0x22020080,0x83e0082,0x20202207,0x80000020,0x1020,0xa4848220,0x80210802,0x9c2102,0x20c010,
      0x12425104,0x3c1043c0,0x8080841,0x41540802,0x804008,0x1000000,0x78220,0x40220f81,0x882202,0x40c008,0x12422088,0x22088100,
      0x60100881,0x41540805,0x406008,0x1849000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20280,0xf0140200,0x880028,0x20e0a03f,0x709c800,
      0x201c0,0x60000881,0xa0000007,0xc0284b,0x122eb020,0x12048120,0x48120487,0x80802008,0x2008008,0x2008020,0x21094411,0x4411044,
      0x10204908,0x42108421,0x2022088,0x1e0781e0,0x781e0787,0xf8403e0f,0x83e0f808,0x2008020,0x22088220,0x88220882,0x21fc2a08,0x82208822,
      0x5022050,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20001,0xf80a0294,0x40001000,0x80002000,0x20,0x22020100,0x8040082,0x20202200,
      0x80000018,0x1fc06020,0xa48fc220,0x80210802,0x842102,0x20a010,0x12425104,0x20104240,0x8080841,0x41541402,0x1004008,0x1000000,
      0x88220,0x40220801,0x882202,0x40a008,0x12422088,0x22088100,0x18100881,0x41540805,0x801008,0x2046000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x20280,0x401c0f80,0x80880028,0x20005001,0x94800,0x20000,0x880,0xa0000000,0x5015,0x4215040,0x3f0fc3f0,0xfc3f0fc8,
      0x80802008,0x2008008,0x2008020,0x21094411,0x4411044,0x10505108,0x42108421,0x203c088,0x22088220,0x88220888,0x80402008,0x2008008,
      0x2008020,0x22088220,0x88220882,0x20002a08,0x82208822,0x5022050,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xa00a0494,0x60001000,
      0x80002004,0x8020,0x22020200,0x88040882,0x20402201,0x801006,0x18000,0x9f084220,0x40220802,0x442102,0x209010,0x10423088,0x20088220,
      0x8080840,0x80882202,0x2004008,0x1000000,0x88220,0x40220881,0x882202,0x409008,0x12422088,0x22088100,0x8100880,0x80881402,
      0x1001008,0x2000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20280,0x40220200,0x80700027,0x20002801,0x92800,0x1fc000,0x980,
      0xa0000000,0xa017,0x84417840,0x21084210,0x84210848,0x80402008,0x2008008,0x2008020,0x2208c220,0x88220882,0x20882208,0x42108421,
      0x2020088,0x22088220,0x88220888,0xc8402208,0x82208808,0x2008020,0x22088220,0x88220882,0x20203208,0x82208822,0x2022020,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20000,0xa03c0463,0x90000801,0x2004,0x8040,0x1c0703e0,0x70040701,0xc0401c06,0x801001,0x20020,
      0x400843c0,0x3c3c0f82,0x3c2107,0x1c0881e,0x10423070,0x20070210,0xf0080780,0x80882202,0x3e04004,0x1000000,0x783c0,0x381e0701,
      0x782202,0x408808,0x12422070,0x3c078100,0x700c0780,0x80882202,0x1e01008,0x2000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x201e0,
      0xf8000200,0x80080010,0x40000001,0x41000,0x0,0xe80,0xa0000000,0x21,0x8e21038,0x21084210,0x84210848,0xf83c3e0f,0x83e0f81c,
      0x701c070,0x3c08c1c0,0x701c0701,0xc0005c07,0x81e0781e,0x20200b0,0x1e0781e0,0x781e0787,0x30381c07,0x1c07008,0x2008020,0x1c0881c0,
      0x701c0701,0xc0201c07,0x81e0781e,0x203c020,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x80000,0x801,0x4,0x40,0x0,0x0,0x0,0x1000,
      0x0,0x3c000000,0x0,0x0,0x0,0x0,0x10000,0x0,0x0,0x4004,0x1000000,0x0,0x0,0x80000,0x400000,0x0,0x20008000,0x0,0x4,0x1008,0x2000000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x80,0x0,0x8008000f,0x80000000,0x3e000,0x0,0x800,0xa0000400,0x0,0x0,0x0,0x0,0x80000,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x100000,0x0,0x0,0x0,0x0,0x2000,0x0,0x4020040,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x80000,
      0x402,0x8,0x40,0x0,0x0,0x0,0x2000,0x0,0x0,0x0,0x0,0x0,0x0,0xc000,0x0,0x0,0x7004,0x70000fc,0x0,0x0,0x700000,0x800000,0x0,0x20008000,
      0x0,0x4,0x808,0x4000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x80,0x0,0x80f00000,0x0,0x0,0x0,0x800,0xa0001800,0x0,0x0,0x0,0x0,
      0x300000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x600000,0x0,0x0,0x0,0x0,0x0,0x0,0x4020040
    };

    // Definition of a 12x24 font (normal size).
    const unsigned int font12x24[12*24*256/32] = {
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x19,0x80000000,0x198000,0x0,0x0,0x0,0x0,
      0x0,0x198,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xc001806,0xc81980,0x60000000,0xc001806,0x1980c00,0x18060198,0xc80c,
      0x180600,0xc8198000,0xc001,0x80601980,0x18000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf,0x0,0xf0000,0x0,0x0,0x0,0x0,0x0,0x198,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x600300f,0x1301980,0x90000000,0x600300f,0x1980600,0x300f0198,0x13006,0x300f01,0x30198000,0x6003,
      0xf01980,0x30000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x6,0x0,0x60000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7007,0x3c0000,0x3006019,
      0x80000000,0x90000000,0x3006019,0x80000300,0x60198000,0x3,0x601980,0x0,0x3006,0x1980000,0x60000000,0x0,0x0,0xe0000000,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x18000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6000000,
      0x0,0x0,0x0,0x0,0x0,0xc800019,0x80000000,0x198000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xc0,0x0,0x0,0x1001,0x420000,0x0,0x0,0x90000000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x18000c06,0xc80001,0x10000000,0x18000c06,0x1800,0xc060000,0xc818,0xc0600,0xc8000000,
      0x18000,0xc0600000,0xc000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6019,0x80660207,0x800f8060,0x300c004,0x0,0x6,
      0xe00703f,0x3f00383,0xf80f07fc,0x1f01f000,0x0,0xf8,0x607f,0x7c7e07,0xfe7fe0f8,0x6063fc1f,0x86066007,0xe7060f0,0x7f80f07f,
      0x81f8fff6,0x6606c03,0x70ee077f,0xe0786000,0xf0070000,0xc000060,0xc0,0x3e000,0x60006003,0x600fc00,0x0,0x0,0x0,0x0,0x0,0x3c0603,
      0xc0000000,0x7800000,0xf0000,0x0,0xf00001f,0x80001fe0,0x7fe000,0x0,0x0,0x0,0x168fe609,0x0,0x90e07,0x6000,0x3c000e,0x70000f8,
      0x1980001f,0x0,0x1f8,0xf00000f,0xf00180,0xfe000,0xe00e,0x1001,0x20060,0x6006006,0x600600,0x600fe07c,0x7fe7fe7f,0xe7fe3fc3,
      0xfc3fc3fc,0x7e07060f,0xf00f00,0xf00f0000,0xf360660,0x6606606e,0x76001e0,0xc00180f,0x1681981,0x10000000,0xc00180f,0x1980c00,
      0x180f0198,0x3801680c,0x180f01,0x68198000,0xc001,0x80f01980,0x18600198,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6019,
      0x8044020c,0xc01f8060,0x2004004,0x0,0xc,0x3f81f07f,0x87f80383,0xf81f87fc,0x3f83f800,0x0,0x1fc,0x780607f,0x81fe7f87,0xfe7fe1fc,
      0x6063fc1f,0x860c6007,0xe7061f8,0x7fc1f87f,0xc3fcfff6,0x6606c03,0x30c6067f,0xe0783000,0xf00d8000,0x6000060,0xc0,0x7e000,0x60006003,
      0x600fc00,0x0,0x0,0xc00,0x0,0x0,0x7c0603,0xe0000000,0xfc00000,0x1f0000,0x0,0x900003f,0xc0003fe0,0x7fe000,0x0,0x0,0x0,0x1302660f,
      0x0,0xf0606,0x6004,0x7e0006,0x60601f8,0x19800001,0x80000000,0x1f8,0x19800010,0x81080300,0x3f2000,0x2011,0x1001,0x1c0060,0x6006006,
      0x600600,0x601fe1fe,0x7fe7fe7f,0xe7fe3fc3,0xfc3fc3fc,0x7f87061f,0x81f81f81,0xf81f8000,0x3fa60660,0x66066066,0x66003f0,0x6003009,
      0x1301981,0x10000000,0x6003009,0x1980600,0x30090198,0x1f013006,0x300901,0x30198000,0x6003,0x901980,0x30600198,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6019,0x80cc0f8c,0xc0180060,0x6006044,0x40000000,0xc,0x3181b041,0xc41c0783,0x388018,
      0x71c71800,0x0,0x106,0x18c0f061,0xc38261c6,0x600384,0x60606001,0x86186007,0xe78630c,0x60e30c60,0xe7040606,0x630cc03,0x39c30c00,
      0xc0603000,0x3018c000,0x3000060,0xc0,0x60000,0x60000000,0x6000c00,0x0,0x0,0xc00,0x0,0x0,0x600600,0x60000000,0x18400000,0x180000,
      0x0,0x19800070,0x40003600,0xc000,0x0,0x0,0x0,0x25a06,0x0,0x6030c,0x4,0xe20007,0xe060180,0xf000,0x80000000,0xf0000,0x10800000,
      0x80080600,0x7f2000,0x2020,0x80001001,0x20000,0xf00f00f,0xf00f00,0x601b0382,0x60060060,0x6000600,0x60060060,0x61c78630,0xc30c30c3,
      0xc30c000,0x30e60660,0x66066063,0xc600738,0x3006019,0x80000000,0xe0000000,0x3006019,0x80000300,0x60198000,0x3e000003,0x601980,
      0x0,0x3006,0x1980000,0x60600000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6019,0x80cc1fcc,0xc0180060,0x6006035,0x80000000,
      0x18,0x71c03000,0xc00c0583,0x300018,0x60c60c00,0x0,0x6,0x3060f060,0xc30060c6,0x600300,0x60606001,0x86306007,0x9e78670e,0x60670e60,
      0x66000606,0x630c606,0x19830c01,0xc0601800,0x30306000,0x60,0xc0,0x60000,0x60000000,0x6000c00,0x0,0x0,0xc00,0x0,0x0,0x600600,
      0x60000000,0x18000000,0x300000,0x0,0x78060,0x6600,0x1c000,0x300c,0x39819c0,0x0,0x25a00,0x0,0x30c,0x4,0xc00003,0xc060180,0x30c1f,
      0x80000000,0x30c000,0x10800001,0x80700000,0x7f2000,0x2020,0x80001001,0x20060,0xf00f00f,0xf00f00,0xf01b0300,0x60060060,0x6000600,
      0x60060060,0x60c78670,0xe70e70e7,0xe70e000,0x70c60660,0x66066063,0xc7f8618,0x0,0x0,0x0,0x0,0x0,0x0,0x7000000,0x0,0x0,0x0,
      0x0,0x600000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6019,0x87ff3a4c,0xc0180060,0x400600e,0x600000,0x18,0x60c03000,
      0xc00c0d83,0x700018,0x60c60c00,0x20,0x400006,0x3060f060,0xc6006066,0x600600,0x60606001,0x86606006,0x966c6606,0x60660660,0x66000606,
      0x630c666,0xf019801,0x80601800,0x30603000,0x1f06f,0xf01ec0,0xf03fe1ec,0x6703e01f,0x61c0c06,0xdc6701f0,0x6f01ec0c,0xe1f87fc6,
      0xc60cc03,0x71c60c7f,0xc0600600,0x60000000,0x30000000,0x300000,0x40040,0x88060,0x6600,0x18000,0x300c,0x1981980,0x0,0x2421f,
      0x80003ce0,0x7fc198,0x601f,0xc02021,0x980600c0,0x40230,0x80000000,0x402000,0x19806003,0x80006,0xc7f2000,0x2020,0x80001001,
      0x420060,0xf00f00f,0xf00f00,0xf01b0600,0x60060060,0x6000600,0x60060060,0x6066c660,0x66066066,0x6606208,0x60e60660,0x66066061,
      0x987fc670,0x1f01f01f,0x1f01f01,0xf039c0f0,0xf00f00f,0xf03e03,0xe03e03e0,0x1f06701f,0x1f01f01,0xf01f0060,0x1e660c60,0xc60c60c6,
      0xc6f060c,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6000,0x7ff3207,0x8c0c0000,0xc00300e,0x600000,0x30,0x60c03000,
      0xc01c0983,0xf0600030,0x31860c06,0x6001e0,0x78000e,0x23e1f861,0xc6006066,0x600600,0x60606001,0x86c06006,0x966c6606,0x60660660,
      0xe7000606,0x630c666,0xf01f803,0x600c00,0x30000000,0x3f87f,0x83f83fc3,0xf83fe3fc,0x7f83e01f,0x6380c07,0xfe7f83f8,0x7f83fc0d,
      0xf3fc7fc6,0xc71cc03,0x3183187f,0xc0600600,0x60000000,0xff806000,0x300000,0x40040,0x88070,0x6600,0x60030060,0x6001818,0x1883180,
      0x0,0x2423f,0xc0007ff0,0x607fc1f8,0x603f,0x80c01fc1,0xf80601e0,0x5f220,0x80420000,0x5f2000,0xf006006,0x80006,0xc7f2000,0x2020,
      0x82107c07,0xc03c0060,0x1f81f81f,0x81f81f80,0xf03b0600,0x60060060,0x6000600,0x60060060,0x6066c660,0x66066066,0x660671c,0x61660660,
      0x66066061,0xf860e6c0,0x3f83f83f,0x83f83f83,0xf87fe3f8,0x3f83f83f,0x83f83e03,0xe03e03e0,0x3f87f83f,0x83f83f83,0xf83f8060,
      0x3fc60c60,0xc60c60c3,0x187f8318,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6000,0x883200,0x300c0000,0xc003035,0x80600000,
      0x30,0x66c03001,0xc0f81983,0xf86f0030,0x1f071c06,0x600787,0xfe1e001c,0x6261987f,0x86006067,0xfe7fc600,0x7fe06001,0x87c06006,
      0xf6646606,0x60e6067f,0xc3e00606,0x61986f6,0x600f007,0x600c00,0x30000000,0x21c71,0x830831c3,0x1c06031c,0x71c06003,0x6700c06,
      0x6671c318,0x71831c0f,0x16040c06,0xc318606,0x1b031803,0x80600600,0x60000000,0x30009000,0x300000,0x40040,0x7003e,0x67e0,0x90070090,
      0x9001818,0x8c3100,0x0,0x60,0x4000e730,0x900380f0,0x6034,0x80c018c7,0xfe060338,0xb0121,0x80c60000,0x909000,0x6008,0x1080006,
      0xc3f2000,0x2011,0x3180060,0x60060e0,0x19819819,0x81981981,0x9833c600,0x7fe7fe7f,0xe7fe0600,0x60060060,0x60664660,0x66066066,
      0x66063b8,0x62660660,0x66066060,0xf06066c0,0x21c21c21,0xc21c21c2,0x1c466308,0x31c31c31,0xc31c0600,0x60060060,0x31871c31,0x83183183,
      0x18318000,0x71860c60,0xc60c60c3,0x18718318,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6000,0x1981a00,0xe03e0000,0xc003044,
      0x40600000,0x60,0x66c03001,0x80f03182,0x1c7f8030,0x3f83fc06,0x601e07,0xfe078038,0x6661987f,0x86006067,0xfe7fc61e,0x7fe06001,
      0x87e06006,0x66666606,0x7fc6067f,0x81f80606,0x61986f6,0x6006006,0x600600,0x30000000,0xc60,0xc60060c6,0xc06060c,0x60c06003,
      0x6e00c06,0x6660c60c,0x60c60c0e,0x6000c06,0xc318666,0x1f031803,0x600600,0x603c2000,0x30016800,0x1fe0000,0x1f81f8,0x1c1f,0x804067e1,
      0x68060168,0x16800810,0xc42300,0x0,0x60,0x20c331,0x68030060,0x6064,0x3fc1040,0xf006031c,0xa011e,0x818c7fe0,0x909000,0x7fe1f,
      0x80f00006,0xc0f2060,0xf80e,0x18c0780,0x780781c0,0x19819819,0x81981981,0x9833c600,0x7fe7fe7f,0xe7fe0600,0x60060060,0xfc666660,
      0x66066066,0x66061f0,0x66660660,0x66066060,0x606066e0,0xc00c00,0xc00c00c0,0xc066600,0x60c60c60,0xc60c0600,0x60060060,0x60c60c60,
      0xc60c60c6,0xc60c000,0x61c60c60,0xc60c60c3,0x1860c318,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6000,0x1980f81,0x80373000,
      0xc003004,0x7fe0001,0xf0000060,0x60c03003,0x183180,0xc71c060,0x3181ec00,0x7000,0xe070,0x66619860,0xc6006066,0x60061e,0x60606001,
      0x87606006,0x66626606,0x7f860661,0xc01c0606,0x6198696,0xf00600e,0x600600,0x30000000,0x1fc60,0xc60060c7,0xfc06060c,0x60c06003,
      0x7c00c06,0x6660c60c,0x60c60c0c,0x7f00c06,0xc3b8666,0xe01b007,0x3c00600,0x3c7fe000,0xff03ec00,0x1fe0000,0x40040,0xe001,0xc0806603,
      0xec0e03ec,0x3ec00010,0x0,0x60000000,0x7f,0x10c3f3,0xec070060,0x6064,0x3fc1040,0x6000030c,0xa0100,0x3187fe1,0xf09f1000,0x7fe00,
      0x6,0xc012060,0x0,0xc63c03,0xc03c0380,0x19819819,0x81981981,0x98330600,0x60060060,0x6000600,0x60060060,0xfc662660,0x66066066,
      0x66060e0,0x6c660660,0x66066060,0x6060e630,0x1fc1fc1f,0xc1fc1fc1,0xfc3fe600,0x7fc7fc7f,0xc7fc0600,0x60060060,0x60c60c60,0xc60c60c6,
      0xc60c7fe,0x62c60c60,0xc60c60c1,0xb060c1b0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6000,0xffe02c6,0x3c633000,0xc003004,
      0x7fe0001,0xf00000c0,0x60c03006,0xc6180,0xc60c060,0x60c00c00,0x7000,0xe060,0x66639c60,0x66006066,0x600606,0x60606001,0x86306006,
      0x66636606,0x60060660,0xc0060606,0x61f8696,0xf00600c,0x600300,0x30000000,0x3fc60,0xc60060c7,0xfc06060c,0x60c06003,0x7c00c06,
      0x6660c60c,0x60c60c0c,0x1f80c06,0xc1b0666,0xe01b00e,0x3c00600,0x3c43c000,0x3007de00,0x600000,0x40040,0x30000,0x61006607,0xde0c07de,
      0x7de00000,0x0,0xf07fefff,0x1f,0x8008c3f7,0xde0e0060,0x6064,0xc01047,0xfe00018c,0xb013f,0x86300061,0xf0911000,0x6000,0x6,
      0xc012060,0x3f,0x8063c0cc,0x3cc0c700,0x39c39c39,0xc39c39c1,0x98630600,0x60060060,0x6000600,0x60060060,0x60663660,0x66066066,
      0x66061f0,0x78660660,0x66066060,0x607fc618,0x3fc3fc3f,0xc3fc3fc3,0xfc7fe600,0x7fc7fc7f,0xc7fc0600,0x60060060,0x60c60c60,0xc60c60c6,
      0xc60c7fe,0x64c60c60,0xc60c60c1,0xb060c1b0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6000,0xffe0260,0x6661b000,0xc003000,
      0x600000,0xc0,0x60c0300c,0xc7fe0,0xc60c060,0x60c01c00,0x1e07,0xfe078060,0x6663fc60,0x66006066,0x600606,0x60606001,0x86386006,
      0x6636606,0x60060660,0xe0060606,0x60f039c,0x1b806018,0x600300,0x30000000,0x70c60,0xc60060c6,0x6060c,0x60c06003,0x7600c06,
      0x6660c60c,0x60c60c0c,0x1c0c06,0xc1b03fc,0xe01f01c,0xe00600,0x70000000,0x3007fc00,0x600000,0x40040,0x0,0x62006607,0xfc1807fc,
      0x7fc00000,0x0,0xf0000000,0x1,0xc004c307,0xfc1c0060,0x6064,0xc018c0,0x600000d8,0x5f200,0x3180060,0x50a000,0x6000,0x6,0xc012000,
      0x0,0xc601c0,0x4201c600,0x3fc3fc3f,0xc3fc3fc3,0xfc7f0600,0x60060060,0x6000600,0x60060060,0x60663660,0x66066066,0x66063b8,
      0x70660660,0x66066060,0x607f860c,0x70c70c70,0xc70c70c7,0xcc60600,0x60060060,0x6000600,0x60060060,0x60c60c60,0xc60c60c6,0xc60c000,
      0x68c60c60,0xc60c60c1,0xf060c1f0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3300260,0x6661e000,0xc003000,0x600000,
      0x180,0x71c03018,0xc7fe0,0xc60c0c0,0x60c01800,0x787,0xfe1e0060,0x6663fc60,0x630060c6,0x600306,0x60606001,0x86186006,0x661e70e,
      0x60070c60,0x60060606,0x60f039c,0x19806038,0x600180,0x30000000,0x60c60,0xc60060c6,0x6060c,0x60c06003,0x6700c06,0x6660c60c,
      0x60c60c0c,0xc0c06,0xc1b039c,0x1f00e018,0x600600,0x60000000,0x1803f800,0x600000,0x40040,0x39e00,0x63006603,0xf83803f8,0x3f800000,
      0x0,0x60000000,0x0,0xc00cc303,0xf8180060,0x6064,0xc01fc0,0x60060070,0x40200,0x18c0060,0x402000,0x6000,0x6,0xc012000,0x0,0x18c0140,
      0x2014600,0x3fc3fc3f,0xc3fc3fc3,0xfc7f0300,0x60060060,0x6000600,0x60060060,0x60c61e70,0xe70e70e7,0xe70e71c,0x60e60660,0x66066060,
      0x6060060c,0x60c60c60,0xc60c60c6,0xcc60600,0x60060060,0x6000600,0x60060060,0x60c60c60,0xc60c60c6,0xc60c000,0x70c60c60,0xc60c60c0,
      0xe060c0e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x33022e0,0x6670c000,0xc003000,0x600600,0x60180,0x31803030,
      0x41c0184,0x1831c0c0,0x71c23806,0x6001e0,0x780000,0x62630c60,0xe38261c6,0x600386,0x60606043,0x860c6006,0x661e30c,0x60030c60,
      0x740e0607,0xe0f039c,0x31c06030,0x600180,0x30000000,0x61c71,0x830831c3,0x406031c,0x60c06003,0x6300c06,0x6660c318,0x71831c0c,
      0x41c0c07,0x1c0e039c,0x1b00e030,0x600600,0x60000000,0x1c41b00e,0x601cc0,0x401f8,0x45240,0xe1803601,0xb03001b0,0x1b000000,
      0x0,0x0,0x41,0xc008e711,0xb0300060,0x6034,0x80c02020,0x60060030,0x30c00,0xc60000,0x30c000,0x0,0x7,0x1c012000,0x0,0x3180240,
      0x6024608,0x30c30c30,0xc30c30c3,0xc630382,0x60060060,0x6000600,0x60060060,0x61c61e30,0xc30c30c3,0xc30c208,0x70c70e70,0xe70e70e0,
      0x6060068c,0x61c61c61,0xc61c61c6,0x1cc62308,0x30430430,0x43040600,0x60060060,0x31860c31,0x83183183,0x18318060,0x31c71c71,
      0xc71c71c0,0xe07180e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6000,0x2203fc0,0x663f6000,0x6006000,0x600600,0x60300,
      0x3f81fe7f,0xc7f80187,0xf83f80c0,0x3f83f006,0x600020,0x400060,0x33e6067f,0xc1fe7f87,0xfe6001fe,0x6063fc7f,0x60e7fe6,0x660e3f8,
      0x6001f860,0x37fc0603,0xfc06030c,0x30c0607f,0xe06000c0,0x30000000,0x7fc7f,0x83f83fc3,0xfc0603fc,0x60c7fe03,0x61807c6,0x6660c3f8,
      0x7f83fc0c,0x7f80fc3,0xfc0e039c,0x3180607f,0xc0600600,0x60000000,0xfc0e00c,0x601986,0x66040040,0x4527f,0xc0803fe0,0xe07fe0e0,
      0xe000000,0x0,0x0,0x7f,0x80107ff0,0xe07fc060,0x603f,0x83fe0000,0x60060018,0xf000,0x420000,0xf0000,0x7fe00,0x7,0xfe012000,
      0x0,0x2100640,0xc0643f8,0x60660660,0x66066067,0xec3e1fe,0x7fe7fe7f,0xe7fe3fc3,0xfc3fc3fc,0x7f860e3f,0x83f83f83,0xf83f8000,
      0x5fc3fc3f,0xc3fc3fc0,0x606006fc,0x7fc7fc7f,0xc7fc7fc7,0xfcffe3f8,0x3fc3fc3f,0xc3fc7fe7,0xfe7fe7fe,0x3f860c3f,0x83f83f83,
      0xf83f8060,0x7f83fc3f,0xc3fc3fc0,0x607f8060,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x6000,0x2201f80,0x3c1e7000,0x6006000,
      0x600,0x60300,0xe01fe7f,0xc3f00183,0xe01f0180,0x1f01e006,0x600000,0x60,0x3006067f,0x807c7e07,0xfe6000f8,0x6063fc3e,0x6067fe6,
      0x660e0f0,0x6000f060,0x3bf80601,0xf806030c,0x60e0607f,0xe06000c0,0x30000000,0x1ec6f,0xf01ec0,0xf80601ec,0x60c7fe03,0x61c03c6,
      0x6660c1f0,0x6f01ec0c,0x3f007c1,0xcc0e030c,0x71c0c07f,0xc0600600,0x60000000,0x7804018,0xe01186,0x66040040,0x39e3f,0x80401fe0,
      0x407fe040,0x4000000,0x0,0x0,0x3f,0x203ce0,0x407fc060,0x601f,0x3fe0000,0x60060018,0x0,0x0,0x0,0x7fe00,0x6,0xe6012000,0x0,
      0x7e0,0x1807e1f0,0x60660660,0x66066066,0x6c3e07c,0x7fe7fe7f,0xe7fe3fc3,0xfc3fc3fc,0x7e060e0f,0xf00f00,0xf00f0000,0x8f01f81f,
      0x81f81f80,0x60600670,0x1ec1ec1e,0xc1ec1ec1,0xec79c0f0,0xf80f80f,0x80f87fe7,0xfe7fe7fe,0x1f060c1f,0x1f01f01,0xf01f0000,0x4f01cc1c,
      0xc1cc1cc0,0xc06f00c0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x200,0x0,0x6006000,0x600,0x600,0x0,0x0,0x0,0x0,
      0x600000,0x0,0x18000000,0x0,0x0,0x0,0x0,0x0,0x1800,0x0,0x0,0x0,0x600060,0x30000000,0x0,0x0,0xc,0x3,0x0,0x0,0x60000c00,0x0,
      0x0,0xc000,0x600600,0x60000000,0x18,0xc03100,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x4,0x0,0x601f8,0x0,0x0,0x0,0x0,0x6,
      0x12000,0x2000000,0x40,0x20004000,0x0,0x0,0x10,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x10,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0xc06000c0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x200,0x0,0x2004000,0xc00,0x0,0x0,0x0,0x0,0x0,0xc00000,
      0x0,0x1c000000,0x0,0x0,0x0,0x0,0x0,0xc00,0x0,0x0,0x0,0x780000,0xf0000000,0x0,0x0,0x21c,0x3,0x0,0x0,0x60000c00,0x0,0x0,0xc000,
      0x7c0603,0xe0000000,0x10,0xc02300,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x4,0x0,0x601f0,0x0,0x0,0x0,0x0,0x6,0x12000,0x1000000,
      0x40,0x7e004000,0x0,0x0,0x8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xc06000c0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x200,0x0,0x300c000,0xc00,0x0,0x0,0x0,0x0,0x0,0xc00000,0x0,0x7800000,0x0,
      0x0,0x0,0x0,0x0,0x800,0x0,0x0,0x0,0x780000,0xf0000000,0x0,0x0,0x3f8,0x3e,0x0,0x0,0x60000c00,0x0,0x0,0x38000,0x3c0603,0xc0000000,
      0x10,0xfc00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x4,0x0,0x60000,0x0,0x0,0x0,0x0,0x6,0x0,0x1000000,0x0,0x0,0x0,0x0,
      0x8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3,0x80600380,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xffc,0x0,
      0x0,0x1f0,0x3c,0x0,0x0,0x60000c00,0x0,0x0,0x38000,0x600,0x0,0x0,0xf000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x6,0x0,0xe000000,0x0,0x0,0x0,0x0,0x70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x70,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x3,0x80600380,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xffc,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x600,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0 };

    // Definition of a 16x32 font (large size).
    const unsigned int font16x32[16*32*256/32] = {
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xc300000,0x0,0xc300000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xe70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x70000e0,0x3c00730,0xe7001c0,0x0,0x70000e0,0x3c00e70,0x70000e0,0x3c00e70,0x730,0x70000e0,0x3c00730,
      0xe700000,0x700,0xe003c0,0xe7000e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x6600000,0x0,0x6600000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xe70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x18001c0,0x6600ff0,0xe7003e0,0x0,0x18001c0,0x6600e70,0x18001c0,0x6600e70,0xff0,0x18001c0,0x6600ff0,0xe700000,0x180,
      0x1c00660,0xe7001c0,0x0,0x0,0x0,0x380,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c00000,
      0x0,0x3c00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xe70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c00380,
      0xc300ce0,0xe700630,0x0,0x1c00380,0xc300e70,0x1c00380,0xc300e70,0xce0,0x1c00380,0xc300ce0,0xe700000,0x1c0,0x3800c30,0xe700380,
      0x0,0x0,0x0,0x7c0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0xe000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1800000,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0xc300000,0x0,0xc300000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x700000,0x0,0x0,0x0,0x7c007c00,0x3e000000,
      0x0,0x0,0x630,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xe000070,0x1800000,0xc60,0x0,0xe000070,0x1800000,0xe000070,
      0x1800000,0x0,0xe000070,0x1800000,0x0,0xe00,0x700180,0x70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x800000,0x0,0x600600,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x3f0,0xfc0,0x0,0x7000000,0x38000000,0x1c0000,0xfc0000,0x380001c0,0xe01c00,0x7f800000,0x0,0x0,0x0,0x0,0x0,0x0,0x7c,
      0x1801f00,0x0,0x0,0x1c,0x0,0x0,0x3c00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7300000,0x6600000,0x0,0x6600000,0x0,0x0,0x0,0x0,0xe700000,
      0x0,0x0,0x0,0x0,0x0,0xe00000,0x0,0x0,0x0,0xc000c00,0x43800000,0x0,0x0,0x630,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0xf80,0x70000e0,0x3c00730,0xe700c60,0x0,0x70000e0,0x3c00e70,0x70000e0,0x3c00e70,0xe000730,0x70000e0,0x3c00730,0xe700000,0x700,
      0xe003c0,0xe7000e0,0x38000e70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0x6300000,0x803c00,0x7c00180,
      0xc00300,0x1000000,0x0,0x1c,0x3c007c0,0xfc007e0,0xe01ff8,0x3f03ffc,0x7e007c0,0x0,0x0,0x7c0,0x1c0,0x7f8003f0,0x7f007ff8,0x7ff803f0,
      0x70381ffc,0xff0700e,0x7000783c,0x783807c0,0x7fc007c0,0x7fc00fc0,0x7fff7038,0x700ee007,0x780f780f,0x7ffc03f0,0x70000fc0,0x3c00000,
      0x3000000,0x38000000,0x1c0000,0x1fc0000,0x380001c0,0xe01c00,0x7f800000,0x0,0x0,0x0,0x0,0x0,0x0,0xfc,0x1801f80,0x0,0x1f80000,
      0x7e,0x0,0x0,0x2400000,0xfc00000,0x7ff0000,0x7ffc0000,0x0,0x0,0x0,0x0,0xf30fb0c,0x2400000,0x0,0x240780f,0x1c0,0xfc,0x780f,
      0x18003f0,0xe700000,0x7c00000,0x0,0xff0,0x3c00000,0x78007c0,0xc00000,0xff80000,0xf80,0x7c00000,0xc000c00,0x18001c0,0x1c001c0,
      0x1c001c0,0x1c003e0,0x7fe03f0,0x7ff87ff8,0x7ff87ff8,0x1ffc1ffc,0x1ffc1ffc,0x7f007838,0x7c007c0,0x7c007c0,0x7c00000,0x7c67038,
      0x70387038,0x7038780f,0x70001fe0,0x30000c0,0x2400f30,0xe700c60,0x0,0x30000c0,0x2400e70,0x30000c0,0x2400e70,0xf700f30,0x30000c0,
      0x2400f30,0xe700000,0x300,0xc00240,0xe7000c0,0x38000e70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,
      0x630018c,0x807e00,0xfe00180,0xc00300,0x1000000,0x0,0x38,0xff01fc0,0x3ff01ff0,0x1e01ff8,0x7f83ffc,0x1ff80ff0,0x0,0x0,0xff0,
      0x1f003e0,0x7fe00ff8,0x7fc07ff8,0x7ff80ff8,0x70381ffc,0xff0701c,0x7000783c,0x78381ff0,0x7fe01ff0,0x7fe01ff0,0x7fff7038,0x781ee007,
      0x3c1e380e,0x7ffc0380,0x380001c0,0x3c00000,0x1800000,0x38000000,0x1c0000,0x3c00000,0x380001c0,0xe01c00,0x3800000,0x0,0x0,
      0x0,0x7000000,0x0,0x0,0x1e0,0x18003c0,0x0,0x3fc0000,0x70,0x0,0x0,0x6600000,0x1ff00000,0x1fff0000,0x7ffc0000,0x0,0x0,0x0,0x0,
      0xcf0239c,0x3c00000,0x0,0x3c0380e,0x1c0,0x2001fe,0x380e,0x18007f8,0xe700000,0x8600000,0x0,0xff0,0x7e00000,0x8c00870,0x1800000,
      0x1ff80000,0x180,0xc600000,0xc000c00,0x38001c0,0x3e003e0,0x3e003e0,0x3e001c0,0x7fe0ff8,0x7ff87ff8,0x7ff87ff8,0x1ffc1ffc,0x1ffc1ffc,
      0x7fc07838,0x1ff01ff0,0x1ff01ff0,0x1ff00000,0x1fec7038,0x70387038,0x7038380e,0x70003ce0,0x1800180,0x6600cf0,0xe7007c0,0x0,
      0x1800180,0x6600e70,0x1800180,0x6600e70,0x7c00cf0,0x1800180,0x6600cf0,0xe700000,0x180,0x1800660,0xe700180,0x38000e70,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0x630030c,0x3f0e700,0x1e200180,0x1800180,0x21100000,0x0,
      0x38,0x1e7819c0,0x38781038,0x1e01c00,0xf080038,0x1c381c38,0x0,0x0,0x1878,0x7fc03e0,0x70e01e18,0x70e07000,0x70001e18,0x703801c0,
      0x707038,0x70007c7c,0x7c381c70,0x70701c70,0x70703830,0x1c07038,0x381ce007,0x1c1c3c1e,0x3c0380,0x380001c0,0x7e00000,0xc00000,
      0x38000000,0x1c0000,0x3800000,0x38000000,0x1c00,0x3800000,0x0,0x0,0x0,0x7000000,0x0,0x0,0x1c0,0x18001c0,0x0,0x70c0000,0xe0,
      0x0,0x0,0xc300000,0x38300000,0x3c700000,0x3c0000,0x0,0x0,0x0,0x0,0xce022f4,0x1800000,0x0,0x1803c1e,0x1c0,0x2003c2,0x3c1e,
      0x1800e08,0x7e0,0x300000,0x0,0x7e00000,0xe700000,0x600030,0x3000000,0x3f980000,0x180,0x18200000,0xc000c00,0x1e0001c0,0x3e003e0,
      0x3e003e0,0x3e003e0,0xfe01e18,0x70007000,0x70007000,0x1c001c0,0x1c001c0,0x70e07c38,0x1c701c70,0x1c701c70,0x1c700000,0x3c787038,
      0x70387038,0x70383c1e,0x70003870,0xc00300,0xc300ce0,0x380,0x0,0xc00300,0xc300000,0xc00300,0xc300000,0xfc00ce0,0xc00300,0xc300ce0,
      0x0,0xc0,0x3000c30,0x300,0x38000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0x630031c,0xff8c300,
      0x1c000180,0x1800180,0x39380000,0x0,0x70,0x1c3801c0,0x203c001c,0x3e01c00,0x1c000038,0x381c3838,0x0,0x0,0x1038,0xe0e03e0,0x70703c08,
      0x70707000,0x70003808,0x703801c0,0x707070,0x70007c7c,0x7c383838,0x70383838,0x70387010,0x1c07038,0x381c700e,0x1e3c1c1c,0x780380,
      0x1c0001c0,0xe700000,0x0,0x38000000,0x1c0000,0x3800000,0x38000000,0x1c00,0x3800000,0x0,0x0,0x0,0x7000000,0x0,0x0,0x1c0,0x18001c0,
      0x0,0xe000000,0xe0,0x0,0x1000100,0x3800,0x70100000,0x38700000,0x780000,0x1c0,0x7801ce0,0xe380000,0x0,0x2264,0x0,0x0,0x1c1c,
      0x0,0x200780,0x1c1c,0x1800c00,0x1818,0x7f00000,0x0,0x18180000,0xc300000,0x600070,0x0,0x7f980000,0x180,0x18300000,0xc000c00,
      0x3000000,0x3e003e0,0x3e003e0,0x3e003e0,0xee03c08,0x70007000,0x70007000,0x1c001c0,0x1c001c0,0x70707c38,0x38383838,0x38383838,
      0x38380000,0x38387038,0x70387038,0x70381c1c,0x7fc03870,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xbc00000,0x0,0x0,0x0,0x0,0x0,0x0,
      0x38000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0x6300318,0xe88c300,0x1c000180,0x38001c0,
      0xfe00180,0x0,0x70,0x1c3801c0,0x1c001c,0x6e01c00,0x1c000078,0x381c3818,0x0,0x40000,0x40000038,0x1c0607e0,0x70703800,0x70707000,
      0x70003800,0x703801c0,0x7070e0,0x70007c7c,0x7c383838,0x70383838,0x70387000,0x1c07038,0x381c700e,0xf780e38,0x700380,0x1c0001c0,
      0x1c380000,0x0,0x38000000,0x1c0000,0x3800000,0x38000000,0x1c00,0x3800000,0x0,0x0,0x0,0x7000000,0x0,0x0,0x1c0,0x18001c0,0x0,
      0xe000000,0xe0,0x0,0x1000100,0x4400,0x70000000,0x38700000,0x700000,0xe0,0x7001c70,0xe380000,0x0,0x2264,0x0,0x0,0xe38,0x0,
      0x200700,0xe38,0x1800c00,0x300c,0xc300000,0x0,0x300c0000,0xc300180,0x6003c0,0x0,0x7f980000,0x180,0x18300000,0xc000c00,0x1800000,
      0x7e007e0,0x7e007e0,0x7e003e0,0xee03800,0x70007000,0x70007000,0x1c001c0,0x1c001c0,0x70707c38,0x38383838,0x38383838,0x38380000,
      0x38387038,0x70387038,0x70380e38,0x7ff039f0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1e00000,0x0,0x0,0x0,0x40000,0x0,0x0,0x38000000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0x6300318,0x1c80e700,0x1c000180,0x38001c0,0x3800180,
      0x0,0xe0,0x381c01c0,0x1c001c,0x6e01c00,0x38000070,0x381c381c,0x0,0x3c0000,0x78000078,0x38030770,0x70707800,0x70387000,0x70007000,
      0x703801c0,0x7071c0,0x7000745c,0x7638701c,0x7038701c,0x70387000,0x1c07038,0x1c38718e,0x7700f78,0xf00380,0xe0001c0,0x381c0000,
      0x7e0,0x39e003e0,0x79c03f0,0x3ffc079c,0x39e01fc0,0xfe01c1e,0x3807778,0x39e007e0,0x39e0079c,0x73c07e0,0x7ff83838,0x701ce007,
      0x783c701c,0x1ffc01c0,0x18001c0,0x0,0x1c000100,0xe0,0x0,0x1000100,0x4200,0x70000000,0x70700100,0xf00100,0x10000e0,0x7000c70,
      0xc700000,0x0,0x2204,0x7e00000,0x1e380100,0x1ffc0f78,0x0,0xf80700,0xf78,0x1800e00,0x63e6,0x18300000,0x0,0x6fe60000,0xe700180,
      0xc00060,0x3838,0x7f980000,0x180,0x18300000,0xc000c00,0x18001c0,0x7700770,0x7700770,0x77007f0,0xee07800,0x70007000,0x70007000,
      0x1c001c0,0x1c001c0,0x70387638,0x701c701c,0x701c701c,0x701c1008,0x707c7038,0x70387038,0x70380f78,0x707039c0,0x7e007e0,0x7e007e0,
      0x7e007e0,0x1f3c03e0,0x3f003f0,0x3f003f0,0x1fc01fc0,0x1fc01fc0,0x7f039e0,0x7e007e0,0x7e007e0,0x7e00380,0x7ce3838,0x38383838,
      0x3838701c,0x39e0701c,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0x6307fff,0x1c807e0c,0xe000180,
      0x30000c0,0x3800180,0x0,0xe0,0x381c01c0,0x1c001c,0xce01fe0,0x38000070,0x381c381c,0x3800380,0xfc0000,0x7e0000f0,0x30030770,
      0x70707000,0x70387000,0x70007000,0x703801c0,0x707380,0x700076dc,0x7638701c,0x7038701c,0x70387800,0x1c07038,0x1c3873ce,0x7f00770,
      0xe00380,0xe0001c0,0x700e0000,0x1ff8,0x3ff00ff0,0xffc0ff8,0x3ffc0ffc,0x3bf01fc0,0xfe01c3c,0x3807f78,0x3bf00ff0,0x3ff00ffc,
      0x77e0ff0,0x7ff83838,0x3838e007,0x3c783838,0x1ffc01c0,0x18001c0,0x0,0x7ff00380,0x1e0,0x0,0x1000100,0x4200,0x78000000,0x70700380,
      0xe00380,0x3800060,0xe000e30,0x1c600000,0x0,0x2204,0xff00000,0x7f7c0380,0x1ffc0770,0x1c0,0x3fc0700,0x18040770,0x1800780,0x4e12,
      0x18300104,0x0,0x4c320000,0x7e00180,0x1c00030,0x3838,0x7f980000,0x180,0x18302080,0xc000c00,0x18001c0,0x7700770,0x7700770,
      0x7700770,0x1ee07000,0x70007000,0x70007000,0x1c001c0,0x1c001c0,0x70387638,0x701c701c,0x701c701c,0x701c381c,0x705c7038,0x70387038,
      0x70380770,0x70383b80,0x1ff81ff8,0x1ff81ff8,0x1ff81ff8,0x3fbe0ff0,0xff80ff8,0xff80ff8,0x1fc01fc0,0x1fc01fc0,0xff83bf0,0xff00ff0,
      0xff00ff0,0xff00380,0xffc3838,0x38383838,0x38383838,0x3ff03838,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x1c0,0x7fff,0x1c803c38,0xf000000,0x70000e0,0xfe00180,0x0,0x1c0,0x381c01c0,0x3c0078,0xce01ff0,0x39e000f0,0x1c38381c,0x3800380,
      0x3e07ffc,0xf8001f0,0x307b0770,0x70e07000,0x70387000,0x70007000,0x703801c0,0x707700,0x700076dc,0x7638701c,0x7038701c,0x70387e00,
      0x1c07038,0x1c3873ce,0x3e007f0,0x1e00380,0x70001c0,0x0,0x1038,0x3c381e18,0x1c7c1e3c,0x3801e3c,0x3c7801c0,0xe01c78,0x380739c,
      0x3c781c38,0x3c381c3c,0x7c21e10,0x7003838,0x3838700e,0x1ef03838,0x3c01c0,0x18001c0,0x0,0x7fe007c0,0x1c0,0x0,0x1000100,0x6400,
      0x7e000000,0x707007c0,0x1e007c0,0x7c00070,0xe000638,0x18600000,0x0,0x0,0x1e100000,0x73ce07c0,0x3c07f0,0x1c0,0x7240700,0x1ddc3ffe,
      0x1800de0,0x8c01,0x1870030c,0x0,0x8c310000,0x3c00180,0x3800030,0x3838,0x7f980000,0x180,0x183030c0,0xc000c00,0x430001c0,0x7700770,
      0x7700770,0x7700770,0x1ce07000,0x70007000,0x70007000,0x1c001c0,0x1c001c0,0x70387638,0x701c701c,0x701c701c,0x701c1c38,0x70dc7038,
      0x70387038,0x703807f0,0x70383b80,0x10381038,0x10381038,0x10381038,0x21e71e18,0x1e3c1e3c,0x1e3c1e3c,0x1c001c0,0x1c001c0,0x1e383c78,
      0x1c381c38,0x1c381c38,0x1c380380,0x1c383838,0x38383838,0x38383838,0x3c383838,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x1c0,0x630,0x1e8000e0,0x1f000000,0x70000e0,0x39380180,0x0,0x1c0,0x3b9c01c0,0x3c07f0,0x18e01078,0x3bf800e0,
      0x7e0383c,0x3800380,0x1f807ffc,0x3f001c0,0x61ff0e38,0x7fc07000,0x70387ff0,0x7ff07000,0x7ff801c0,0x707f00,0x7000729c,0x7338701c,
      0x7070701c,0x70703fc0,0x1c07038,0x1e7873ce,0x1c003e0,0x3c00380,0x70001c0,0x0,0x1c,0x3c381c00,0x1c3c1c1c,0x3801c3c,0x383801c0,
      0xe01cf0,0x380739c,0x38381c38,0x3c381c3c,0x7801c00,0x7003838,0x3838700e,0xfe03c78,0x7801c0,0x18001c0,0x0,0x1c000c20,0xff8,
      0x0,0x1ff01ff0,0x3818,0x3fc00100,0x707e0c20,0x3c00c20,0xc200030,0xc000618,0x18c00000,0x0,0x0,0x1c000080,0xe1ce0c20,0x7803e0,
      0x1c0,0xe200700,0xff83ffe,0x1801878,0x9801,0x1cf0071c,0x7ffc0000,0x8c310000,0x7ffe,0x7000030,0x3838,0x3f980380,0x180,0xc6038e0,
      0x7f9c7f9c,0x3e1c01c0,0xe380e38,0xe380e38,0xe380f78,0x1cfc7000,0x7ff07ff0,0x7ff07ff0,0x1c001c0,0x1c001c0,0xfe387338,0x701c701c,
      0x701c701c,0x701c0e70,0x719c7038,0x70387038,0x703803e0,0x70383b80,0x1c001c,0x1c001c,0x1c001c,0xe71c00,0x1c1c1c1c,0x1c1c1c1c,
      0x1c001c0,0x1c001c0,0x1c383838,0x1c381c38,0x1c381c38,0x1c380000,0x3c383838,0x38383838,0x38383c78,0x3c383c78,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0x630,0xf800380,0x3f830000,0x70000e0,0x31080180,0x0,0x380,0x3b9c01c0,
      0x7807e0,0x38e00038,0x3c3800e0,0xff01c3c,0x3800380,0x7c000000,0x7c03c0,0x61870e38,0x7fc07000,0x70387ff0,0x7ff070fc,0x7ff801c0,
      0x707f80,0x7000739c,0x7338701c,0x7ff0701c,0x7fe00ff0,0x1c07038,0xe7073ce,0x1c003e0,0x3800380,0x38001c0,0x0,0x1c,0x381c3800,
      0x381c380e,0x380381c,0x383801c0,0xe01de0,0x380739c,0x3838381c,0x381c381c,0x7001e00,0x7003838,0x1c70718e,0x7e01c70,0xf00380,
      0x18001e0,0x1e000000,0x1c001bb0,0xff8,0x0,0x1000100,0xe0,0xff00300,0x707e1bb0,0x3801bb0,0x1bb00010,0x8000308,0x30c00000,0x0,
      0x0,0x1e0000c0,0xe1ce1bb0,0xf003e0,0x1c0,0x1c203ff8,0x63003e0,0x180181c,0x9801,0xfb00e38,0x7ffc0000,0x8fc10000,0x7ffe,0xe000860,
      0x3838,0x1f980380,0x180,0x7c01c70,0x1f001f0,0x1f003c0,0xe380e38,0xe380e38,0xe380e38,0x1cfc7000,0x7ff07ff0,0x7ff07ff0,0x1c001c0,
      0x1c001c0,0xfe387338,0x701c701c,0x701c701c,0x701c07e0,0x731c7038,0x70387038,0x703803e0,0x70383980,0x1c001c,0x1c001c,0x1c001c,
      0xe73800,0x380e380e,0x380e380e,0x1c001c0,0x1c001c0,0x381c3838,0x381c381c,0x381c381c,0x381c0000,0x387c3838,0x38383838,0x38381c70,
      0x381c1c70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0xc30,0x7f00e00,0x33c30000,0x70000e0,0x1007ffe,
      0x0,0x380,0x3b9c01c0,0xf00078,0x30e0001c,0x3c1c01c0,0x1c381fdc,0x0,0x70000000,0x1c0380,0x63030e38,0x70707000,0x70387000,0x700070fc,
      0x703801c0,0x707b80,0x7000739c,0x7338701c,0x7fc0701c,0x7fc001f0,0x1c07038,0xe703e5c,0x3e001c0,0x7800380,0x38001c0,0x0,0x7fc,
      0x381c3800,0x381c380e,0x380381c,0x383801c0,0xe01fe0,0x380739c,0x3838381c,0x381c381c,0x7001fc0,0x7003838,0x1c70718e,0x7c01c70,
      0xe01f00,0x180007c,0x7f8c0000,0x7fc03fb8,0x1c0,0x0,0x1000100,0x700,0x1f00600,0x70703fb8,0x7803fb8,0x3fb80000,0x8000000,0x180,
      0x0,0x0,0x1fc00060,0xe1ce3fb8,0xe001c0,0x1c0,0x1c203ff8,0xc1801c0,0x180c,0x9801,0x1c70,0xc0000,0x8cc10000,0x180,0xfe007c0,
      0x3838,0x7980380,0xff0,0xe38,0x3e003e00,0x3e000380,0xe380e38,0xe380e38,0xe380e38,0x38e07000,0x70007000,0x70007000,0x1c001c0,
      0x1c001c0,0x70387338,0x701c701c,0x701c701c,0x701c03c0,0x731c7038,0x70387038,0x703801c0,0x703838e0,0x7fc07fc,0x7fc07fc,0x7fc07fc,
      0xe73800,0x380e380e,0x380e380e,0x1c001c0,0x1c001c0,0x381c3838,0x381c381c,0x381c381c,0x381c7ffc,0x38dc3838,0x38383838,0x38381c70,
      0x381c1c70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0xc60,0xf83878,0x71e30000,0x70000e0,0x1007ffe,
      0x7f0,0x380,0x381c01c0,0x1e0003c,0x60e0001c,0x381c01c0,0x381c079c,0x0,0x7c000000,0x7c0380,0x63031c1c,0x70307000,0x70387000,
      0x7000701c,0x703801c0,0x7071c0,0x7000739c,0x71b8701c,0x7000701c,0x71e00078,0x1c07038,0xe703e7c,0x7e001c0,0xf000380,0x38001c0,
      0x0,0x1ffc,0x381c3800,0x381c3ffe,0x380381c,0x383801c0,0xe01fc0,0x380739c,0x3838381c,0x381c381c,0x7000ff0,0x7003838,0x1ef03bdc,
      0x3800ee0,0x1e01f00,0x180007c,0x61fc0000,0x7fc07f3c,0x1c0,0x0,0x1000100,0x1800,0x780c00,0x70707f3c,0xf007f3c,0x7f3c0000,0x0,
      0x3c0,0x3ffcffff,0x0,0xff00030,0xe1fe7f3c,0x1e001c0,0x1c0,0x1c200700,0xc183ffe,0xe0c,0x9801,0x1ff038e0,0xc07f0,0x8c610000,
      0x180,0x0,0x3838,0x1980380,0x0,0x1ff0071c,0xe000e000,0xe0000f80,0x1c1c1c1c,0x1c1c1c1c,0x1c1c1e38,0x38e07000,0x70007000,0x70007000,
      0x1c001c0,0x1c001c0,0x703871b8,0x701c701c,0x701c701c,0x701c03c0,0x761c7038,0x70387038,0x703801c0,0x70703870,0x1ffc1ffc,0x1ffc1ffc,
      0x1ffc1ffc,0xfff3800,0x3ffe3ffe,0x3ffe3ffe,0x1c001c0,0x1c001c0,0x381c3838,0x381c381c,0x381c381c,0x381c7ffc,0x389c3838,0x38383838,
      0x38380ee0,0x381c0ee0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1c0,0xfffc,0xbc60fc,0x70e30000,0x70000e0,
      0x180,0x7f0,0x700,0x381c01c0,0x3e0001c,0x7ffc001c,0x381c03c0,0x381c001c,0x0,0x1f807ffc,0x3f00380,0x63031ffc,0x70387000,0x70387000,
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      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x200000,0x0,0x1800000,0x0,0x0,0x0,0x0,0x0,0x0,0x3800,0x0,0x7c00000,0x0,0x3001fc,0x300000,
      0x0,0x0,0x0,0x3e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x3e00,0x38003e00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xfff8,0x0,0x0,0x0,0x7e0,0x0,0x1f000000,
      0x0,0x0,0x3800001c,0x0,0x0,0x0,0x3c00,0x0,0x1800000,0x0,0x0,0x7800,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3800,0x0,0x7800000,0x0,0x0,0x0,0x0,0x0,0x0,0x3c0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c00,0x38003c00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xfff8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1800000,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0 };

    // Definition of a 29x57 font (extra large size).
    const unsigned int font29x57[29*57*256/32] = {
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x781e00,0x0,0x0,0x7,0x81e00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7c0000,0xf8000,0x7e00000,0x0,0x7,
      0xc0000000,0x0,0x7c00,0xf80,0x7e000,0x0,0x7c00000,0xf80000,0x7e000000,0x0,0x0,0x1f00,0x3e0,0x1f800,0x0,0x0,0x0,0x3,0xe0000000,
      0x7c00003f,0x0,0xf8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x3c3c00,0x0,0x0,0x3,0xc3c00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3e1f00,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3e0000,
      0x1f0000,0x7e00000,0xf838001f,0xf80001f,0xf0000000,0x0,0x3e00,0x1f00,0x7e000,0x3e1f000,0x3e00000,0x1f00000,0x7e00003e,0x1f000000,
      0x3e0,0xe0000f80,0x7c0,0x1f800,0x3e0e00,0x7c3e000,0x0,0x1,0xf0000000,0xf800003f,0x1f0f,0x800001f0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1e7800,0x0,0x0,
      0x1,0xe7800000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3e1f00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1e0000,0x1e0000,0xff00001,0xfe38001f,0xf80003f,
      0xf8000000,0x0,0x1e00,0x1e00,0xff000,0x3e1f000,0x1e00000,0x1e00000,0xff00003e,0x1f000000,0x7f8,0xe0000780,0x780,0x3fc00,0x7f8e00,
      0x7c3e000,0x0,0x0,0xf0000000,0xf000007f,0x80001f0f,0x800001e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xef000,0x0,0x0,0x0,0xef000000,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3e1f00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf0000,0x3c0000,0x1e780003,0xfff8001f,0xf80003c,0x78000000,0x0,0xf00,0x3c00,0x1e7800,
      0x3e1f000,0xf00000,0x3c00001,0xe780003e,0x1f000000,0xfff,0xe00003c0,0xf00,0x79e00,0xfffe00,0x7c3e000,0x0,0x0,0x78000001,0xe00000f3,
      0xc0001f0f,0x800003c0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0xc0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7e000,0x0,0x0,0x0,0x7e000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x3e1f00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x78000,0x780000,0x3c3c0003,0x8ff0001f,0xf800078,0x3c000000,0x0,0x780,0x7800,0x3c3c00,0x3e1f000,0x780000,0x7800003,0xc3c0003e,
      0x1f000000,0xe3f,0xc00001e0,0x1e00,0xf0f00,0xe3fc00,0x7c3e000,0x0,0x0,0x3c000003,0xc00001e1,0xe0001f0f,0x80000780,0x0,0x0,
      0x0,0x0,0x0,0x0,0x1f,0xf0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x7e000,0x0,0x0,0x0,0x7e000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3e1f00,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xfc00,0x7e000,0xfe000,0x0,0x3c000,0xf00000,0x781e0003,
      0x83e0001f,0xf800070,0x1c000000,0x0,0x3c0,0xf000,0x781e00,0x3e1f000,0x3c0000,0xf000007,0x81e0003e,0x1f000000,0xe0f,0x800000f0,
      0x3c00,0x1e0780,0xe0f800,0x7c3e000,0x0,0x0,0x1e000007,0x800003c0,0xf0001f0f,0x80000f00,0x0,0x0,0x0,0x0,0x0,0x0,0x3f,0xf8000000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3fc00,0x1fe000,0x3ff800,0x0,0x0,0x0,0x0,0x0,0x70,0x1c000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c,0x78000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1f00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf80,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x78,0xf000000,0x0,0x0,0x780f0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7c0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x3fc00,0x1fe000,0x3ffc00,0x0,0x0,0x0,0x0,0x0,0x70,0x1c000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1f00000,0x3e000,0x3e00000,0x0,0x78,0x3c000000,0x0,0x1f000,0x3e0,
      0x3e000,0x0,0x1f000000,0x3e0000,0x3e000000,0x0,0x0,0x7c00,0xf8,0xf800,0x0,0x0,0x0,0xf,0x80000000,0x1f00001f,0x0,0x3e,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x30000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf80000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0xf80,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x781c0000,0x38,0xe000000,0x0,0x0,0x380e0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf80,0x0,0x0,0x0,0x0,0x0,0x0,0x39c00,0x1ce000,0x303e00,
      0x0,0x0,0x0,0x0,0x0,0x78,0x3c000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x4000,0x0,0x0,0x0,0x0,
      0x0,0x0,0xf80000,0x7c000,0x3e00000,0xf0380000,0x70,0x1c000000,0x0,0xf800,0x7c0,0x3e000,0x0,0xf800000,0x7c0000,0x3e000000,
      0x0,0x3c0,0xe0003e00,0x1f0,0xf800,0x3c0e00,0x0,0x0,0x7,0xc0000000,0x3e00001f,0x0,0x7c,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x30000000,0xff,0x0,
      0xf8,0xf8000,0x1c000,0x0,0x0,0x0,0x0,0x1f,0xc0000000,0x1ff8,0xff00,0x0,0x0,0x3fe000,0x0,0x1fc00001,0xfe000000,0x0,0x0,0x0,
      0x0,0x7f800,0x0,0x0,0x0,0xff00000,0x0,0x0,0xff,0x0,0x0,0x0,0x0,0x0,0x0,0x3,0xf8000000,0xfe,0x0,0x7f80,0x0,0x0,0x0,0x0,0x0,
      0x0,0x3f,0xf0000000,0x7fe0,0x0,0x0,0x780000,0x1,0xe0000000,0x0,0x780000,0x3,0xfe000000,0x78000,0x3c00,0xf000,0x7800003,0xffe00000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xfc0000f0,0x3f000,0x0,0x0,0x3fc00,0x0,0x0,0x1fc000,0x0,0x0,0x0,0x1fc0,
      0x0,0xff000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xfe1c0000,0x1c,0x1c000000,0x0,0x0,0x1c1c0,0x0,0x0,0x0,0x0,0x1fe0000,
      0x0,0x0,0x1ff,0x1f0f8,0x0,0xff000,0x0,0x0,0x0,0x3f,0xff00000f,0x80000000,0xfe0,0x3f80,0xf00,0x0,0x0,0x0,0x1,0xf8000003,0xe0000000,
      0x1c00,0xe000,0xe00,0x0,0x0,0x0,0x0,0x0,0x3c,0x78000000,0xff,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7f0,0x3f80,0x1fc00,0xfe000,
      0x7f0000,0x0,0x1fc07000,0x0,0x0,0x0,0x0,0x0,0x3f800,0x780000,0x78000,0x7f00001,0xfc38001f,0xf800070,0x1c000000,0x0,0x7800,
      0x780,0x7f000,0x3e1f000,0x7800000,0x780000,0x7f00003e,0x1f0003f0,0x7f0,0xe0001e00,0x1e0,0x1fc00,0x7f0e00,0x7c3e000,0x0,0x3,
      0xc0000000,0x3c00003f,0x80001f0f,0x80000078,0x1e0000,0x3e1f00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x3c1e0000,0x1e078000,0x30000000,0x3ff,0xc00001e0,0xf0,
      0x78000,0x1c000,0x0,0x0,0x0,0x0,0x1e0007f,0xf000007e,0x1ffff,0x7ffe0,0x1f80,0x3ffff80,0xfff803,0xfffff800,0xfff80007,0xff800000,
      0x0,0x0,0x0,0x0,0x1ffe00,0x0,0xfe0003,0xfff80000,0x3ffe01ff,0xe00003ff,0xffe01fff,0xff0003ff,0xe01e0007,0x803ffff0,0xfff80,
      0x3c000fc0,0x7800001f,0x8003f07e,0x1e000f,0xfe0007ff,0xf00003ff,0x8007ffe0,0x1fff8,0x7fffffe,0xf0003c1,0xe000079e,0xf1f,0x1f3e0,
      0x1f01ff,0xfff8003f,0xf003c000,0x7fe0,0x3f00,0x0,0x3c0000,0x1,0xe0000000,0x0,0x780000,0xf,0xfe000000,0x78000,0x3c00,0xf000,
      0x7800003,0xffe00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0xfc0000f0,0x3fe00,0x0,0x0,0xfff00,0x0,0x0,0x3fe000,
      0x0,0x0,0x0,0x1dc0,0x0,0x3fff00,0x0,0x3ffff80,0x1f,0xffff8000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xff1c07ff,0x3c0f001e,0x3c000000,
      0x0,0x0,0x1e3c0,0xf80007c,0x0,0x780000,0x0,0xfff8000,0x3e00,0x1f00000,0x7ff,0xc001f0f8,0x0,0x3ffc00,0x0,0x0,0x0,0x3f,0xff00003f,
      0xe0000000,0x3ff8,0xffe0,0x1e00,0x0,0xfffc00,0x0,0x7,0xf800000f,0xf8000000,0x1c00,0xe000,0xe00,0xf000,0x1fc000,0xfe0000,0x7f00000,
      0x3f800001,0xfc00003f,0xf80000ff,0xffc003ff,0xe007ffff,0xc03ffffe,0x1fffff0,0xfffff80,0x7fffe003,0xffff001f,0xfff800ff,0xffc01ffc,
      0xfc00,0x3c001ffc,0xffe0,0x7ff00,0x3ff800,0x1ffc000,0x0,0x7ff8f0f0,0x3c0780,0x1e03c00,0xf01e000,0x783e0001,0xf01e0000,0xffe00,
      0x3c0000,0xf0000,0x7700001,0xfe38001f,0xf800070,0x1c000000,0x0,0x3c00,0xf00,0x77000,0x3e1f000,0x3c00000,0xf00000,0x7700003e,
      0x1f0000f8,0xc0007f8,0xe0000f00,0x3c0,0x1dc00,0x7f8e00,0x7c3e000,0x0,0x1,0xe0000000,0x7800003b,0x80001f0f,0x800000f0,0x1e0000,
      0x3e1f00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x780000,0x3c1e0000,0x1e070000,0x300001f0,0x7ff,0xc00001e0,0x1e0,0x7c000,0x1c000,0x0,0x0,0x0,0x0,0x3c000ff,0xf80007fe,
      0x3ffff,0x801ffff8,0x1f80,0x3ffff80,0x3fff803,0xfffff801,0xfffc000f,0xffc00000,0x0,0x0,0x0,0x0,0x7fff80,0x0,0xfe0003,0xffff0000,
      0xffff01ff,0xfc0003ff,0xffe01fff,0xff000fff,0xf01e0007,0x803ffff0,0xfff80,0x3c001f80,0x7800001f,0xc007f07e,0x1e001f,0xff0007ff,
      0xfc0007ff,0xc007fffc,0x3fffc,0x7fffffe,0xf0003c1,0xf0000f9e,0xf0f,0x8003e1e0,0x1e01ff,0xfff8003f,0xf001e000,0x7fe0,0x3f00,
      0x0,0x1e0000,0x1,0xe0000000,0x0,0x780000,0x1f,0xfe000000,0x78000,0x3c00,0xf000,0x7800003,0xffe00000,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0xf,0xfc0000f0,0x3ff00,0x0,0x0,0x1fff80,0x0,0x0,0xffe000,0x0,0x0,0x0,0x3de0,0x0,0x7fff80,0x0,0xfffff80,
      0x1f,0xffff8000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0xe7bc07ff,0x3e1f000f,0x78000000,0x0,0x0,0xf780,0x7800078,0x0,0x780000,0x180000,
      0x1fff8000,0x1e00,0x1e0003c,0xfff,0xc001f0f8,0x0,0x7ffe00,0x0,0x0,0x0,0x3f,0xff00007f,0xf0000000,0x3ffc,0xfff0,0x3c00,0x0,
      0x7fffc00,0x0,0x7,0xf800003f,0xfe000000,0x1c00,0xe000,0xe00,0xf000,0x1fc000,0xfe0000,0x7f00000,0x3f800001,0xfc00001f,0xe00001ff,
      0xffc00fff,0xf007ffff,0xc03ffffe,0x1fffff0,0xfffff80,0x7fffe003,0xffff001f,0xfff800ff,0xffc01fff,0xc000fc00,0x3c003ffe,0x1fff0,
      0xfff80,0x7ffc00,0x3ffe000,0x0,0xfffce0f0,0x3c0780,0x1e03c00,0xf01e000,0x781e0001,0xe01e0000,0x3fff00,0x1e0000,0x1e0000,0xf780003,
      0xcf78001f,0xf800078,0x3c000000,0x0,0x1e00,0x1e00,0xf7800,0x3e1f000,0x1e00000,0x1e00000,0xf780003e,0x1f0000fc,0x7c000f3d,
      0xe0000780,0x780,0x3de00,0xf3de00,0x7c3e000,0x0,0x0,0xf0000000,0xf000007b,0xc0001f0f,0x800001e0,0x1e0000,0x3e1f00,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,
      0x3c1e0000,0x1e0f0000,0x300007fc,0xfff,0xc00001e0,0x1e0,0x3c000,0x1c000,0x0,0x0,0x0,0x0,0x3c001ff,0xfc001ffe,0x3ffff,0xc01ffffc,
      0x3f80,0x3ffff80,0x7fff803,0xfffff803,0xfffe001f,0xffe00000,0x0,0x0,0x0,0x0,0xffff80,0x7f800,0xfe0003,0xffff8001,0xffff01ff,
      0xff0003ff,0xffe01fff,0xff001fff,0xf01e0007,0x803ffff0,0xfff80,0x3c003f00,0x7800001f,0xc007f07f,0x1e003f,0xff8007ff,0xff000fff,
      0xe007ffff,0x7fffc,0x7fffffe,0xf0003c0,0xf0000f1e,0xf07,0x8003c1f0,0x3e01ff,0xfff8003f,0xf001e000,0x7fe0,0x7f80,0x0,0xe0000,
      0x1,0xe0000000,0x0,0x780000,0x1f,0xfe000000,0x78000,0x3c00,0xf000,0x7800003,0xffe00000,0x0,0x0,0x0,0x0,0x0,0x0,0x3c000,0x0,
      0x0,0x0,0x0,0x0,0xf,0xfc0000f0,0x3ff00,0x0,0x0,0x3fff80,0x0,0x0,0xffe000,0x0,0x0,0x0,0x78f0,0x0,0xffff80,0x0,0x3fffff80,0x1f,
      0xffff8000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0xc7f80070,0x3e1f0007,0x70000000,0x0,0x0,0x7700,0x7c000f8,0x0,0x780000,0x180000,
      0x3fff8000,0x1f00,0x3e0003c,0x1f03,0xc001f0f8,0x0,0x703f00,0x0,0x0,0x0,0x3f,0xff0000f0,0xf8000000,0x303e,0xc0f8,0x7800,0x0,
      0xffffc00,0x0,0x7,0x3800003e,0x3e000000,0x1c00,0xe000,0x3c00,0xf000,0x1fc000,0xfe0000,0x7f00000,0x3f800001,0xfc00000f,0xe00001ff,
      0xffc01fff,0xf007ffff,0xc03ffffe,0x1fffff0,0xfffff80,0x7fffe003,0xffff001f,0xfff800ff,0xffc01fff,0xf000fe00,0x3c007fff,0x3fff8,
      0x1fffc0,0xfffe00,0x7fff000,0x1,0xffffc0f0,0x3c0780,0x1e03c00,0xf01e000,0x781f0003,0xe01e0000,0x3fff80,0xe0000,0x3c0000,0x1e3c0003,
      0x8ff0001f,0xf80003c,0x78000000,0x0,0xe00,0x3c00,0x1e3c00,0x3e1f000,0xe00000,0x3c00001,0xe3c0003e,0x1f00007f,0xf8000e3f,0xc0000380,
      0xf00,0x78f00,0xe3fc00,0x7c3e000,0x0,0x0,0x70000001,0xe00000f1,0xe0001f0f,0x800003c0,0x1e0000,0x3e1f00,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x3c1e0000,0x3c0f0000,
      0x30000ffe,0xf80,0xc00001e0,0x3c0,0x1e000,0x101c040,0x0,0x0,0x0,0x0,0x78003f0,0x7e001ffe,0x3f807,0xe01f00fe,0x3f80,0x3ffff80,
      0x7e01803,0xfffff007,0xe03f003f,0x3f00000,0x0,0x0,0x0,0x0,0xfc0fc0,0x3ffe00,0xfe0003,0xffffc003,0xf81f01ff,0xff8003ff,0xffe01fff,
      0xff003f01,0xf01e0007,0x803ffff0,0xfff80,0x3c007e00,0x7800001f,0xc007f07f,0x1e007e,0xfc007ff,0xff801f83,0xf007ffff,0x800fc07c,
      0x7fffffe,0xf0003c0,0xf0000f0f,0x1e07,0xc007c0f8,0x7c01ff,0xfff8003c,0xf000,0x1e0,0xffc0,0x0,0xf0000,0x1,0xe0000000,0x0,0x780000,
      0x3e,0x0,0x78000,0x3c00,0xf000,0x7800000,0x1e00000,0x0,0x0,0x0,0x0,0x0,0x0,0x3c000,0x0,0x0,0x0,0x0,0x0,0x1f,0x800000f0,0x1f80,
      0x0,0x0,0x7e0780,0x0,0x0,0x1f82000,0x0,0x0,0x0,0x7070,0x0,0x1f80f80,0x0,0x7fffff80,0x1f,0xffff8000,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x1,0xc3f80070,0x3f3f0007,0xf0000000,0x0,0x0,0x7f00,0x3e001f0,0x0,0x780000,0x180000,0x7f018000,0xf80,0x7c0003c,0x3e00,
      0x4001f0f8,0xfe00,0x400f00,0x0,0x0,0x0,0x7f000000,0xe0,0x38000000,0x1e,0x38,0x7800,0x0,0x1ffe1c00,0x0,0x0,0x38000078,0xf000000,
      0x1c00,0xe000,0x7f800,0xf000,0x1fc000,0xfe0000,0x7f00000,0x3f800001,0xfc00001f,0xf00001ff,0xffc03f81,0xf007ffff,0xc03ffffe,
      0x1fffff0,0xfffff80,0x7fffe003,0xffff001f,0xfff800ff,0xffc01fff,0xf800fe00,0x3c00fc1f,0x8007e0fc,0x3f07e0,0x1f83f00,0xfc1f800,
      0x3,0xf07fc0f0,0x3c0780,0x1e03c00,0xf01e000,0x780f8007,0xc01e0000,0x7e0fc0,0xf0000,0x3c0000,0x1c1c0003,0x87f0001f,0xf80003f,
      0xf8000000,0x0,0xf00,0x3c00,0x1c1c00,0x3e1f000,0xf00000,0x3c00001,0xc1c0003e,0x1f00003f,0xc0000e1f,0xc00003c0,0xf00,0x70700,
      0xe1fc00,0x7c3e000,0x0,0x0,0x78000001,0xe00000e0,0xe0001f0f,0x800003c0,0x1e0000,0x3e1f00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x3c1e0000,0x3c0f0001,0xff801e0f,
      0x1f00,0x1e0,0x3c0,0x1e000,0x3c1c1e0,0x0,0x0,0x0,0x0,0x78007c0,0x1f001f9e,0x3c001,0xf010003e,0x7780,0x3c00000,0xf800000,0xf007,
      0xc01f007c,0x1f80000,0x0,0x0,0x0,0x0,0xe003e0,0x7fff00,0x1ef0003,0xc007e007,0xc00301e0,0x1fc003c0,0x1e00,0x7c00,0x301e0007,
      0x80007800,0x780,0x3c00fc00,0x7800001f,0xe00ff07f,0x1e00f8,0x3e00780,0x1fc03e00,0xf807801f,0xc01f001c,0xf000,0xf0003c0,0xf0000f0f,
      0x1e03,0xc00f8078,0x780000,0xf0003c,0xf000,0x1e0,0x1f3e0,0x0,0x78000,0x1,0xe0000000,0x0,0x780000,0x3c,0x0,0x78000,0x0,0x0,
      0x7800000,0x1e00000,0x0,0x0,0x0,0x0,0x0,0x0,0x3c000,0x0,0x0,0x0,0x0,0x0,0x1f,0xf0,0xf80,0x0,0x0,0xf80180,0x0,0x0,0x1e00000,
      0x0,0x0,0x0,0xe038,0x0,0x3e00380,0x0,0xfe0f0000,0x0,0xf0000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0xc0f00070,0x3b370003,0xe0000000,
      0x0,0x0,0x3e00,0x1e001e0,0x0,0x780000,0x180000,0x7c000000,0x780,0x780003c,0x3c00,0x0,0x7ffc0,0x780,0x0,0x0,0x3,0xffe00000,
      0x1c0,0x3c000000,0xe,0x38,0xf000,0x0,0x3ffe1c00,0x0,0x0,0x38000078,0xf000000,0x1c00,0xe000,0x7f000,0xf000,0x3de000,0x1ef0000,
      0xf780000,0x7bc00003,0xde00001e,0xf00003e7,0x80007c00,0x30078000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,
      0xe0001e03,0xfc00fe00,0x3c01f007,0xc00f803e,0x7c01f0,0x3e00f80,0x1f007c00,0x7,0xc01f80f0,0x3c0780,0x1e03c00,0xf01e000,0x78078007,
      0x801e0000,0x7803c0,0x78000,0x780000,0x380e0003,0x81e00000,0x1f,0xf0000000,0x0,0x780,0x7800,0x380e00,0x0,0x780000,0x7800003,
      0x80e00000,0x1ff,0x80000e07,0x800001e0,0x1e00,0xe0380,0xe07800,0x0,0x0,0x0,0x3c000003,0xc00001c0,0x70000000,0x780,0x1e0000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x780000,0x3c1e0000,0x3c0e0007,0xfff01c07,0x1e00,0x1e0,0x780,0xf000,0x3e1c3e0,0x0,0x0,0x0,0x0,0xf0007c0,0x1f00181e,0x20000,
      0xf000001f,0xf780,0x3c00000,0x1f000000,0x1f00f,0x800f8078,0xf80000,0x0,0x0,0x0,0x0,0x8003e0,0x1fc0f80,0x1ef0003,0xc001e007,
      0x800101e0,0x7e003c0,0x1e00,0x7800,0x101e0007,0x80007800,0x780,0x3c00f800,0x7800001e,0xe00ef07f,0x801e00f0,0x1e00780,0x7c03c00,
      0x78078007,0xc01e0004,0xf000,0xf0003c0,0x78001e0f,0x1e03,0xe00f807c,0xf80000,0x1f0003c,0x7800,0x1e0,0x3e1f0,0x0,0x3c000,0x1,
      0xe0000000,0x0,0x780000,0x3c,0x0,0x78000,0x0,0x0,0x7800000,0x1e00000,0x0,0x0,0x0,0x0,0x0,0x0,0x3c000,0x0,0x0,0x0,0x0,0x0,
      0x1e,0xf0,0x780,0x0,0x0,0x1f00080,0x0,0x0,0x3c00000,0x0,0x0,0x0,0x1e03c,0x0,0x3c00080,0x0,0xf80f0000,0x0,0x1f0000,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x70,0x3bf70003,0xe0000000,0x0,0x0,0x3e00,0x1f003e0,0x0,0x780000,0x180000,0x78000000,0x7c0,0xf80003c,
      0x3c00,0x0,0x1f01f0,0x780,0x0,0x0,0xf,0x80f80000,0x1c0,0x1c000000,0xe,0x38,0x1e000,0x0,0x7ffe1c00,0x0,0x0,0x380000f0,0x7800000,
      0x1c00,0xe000,0x7fc00,0xf000,0x3de000,0x1ef0000,0xf780000,0x7bc00003,0xde00001e,0xf00003c7,0x80007800,0x10078000,0x3c0000,
      0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x7e00ff00,0x3c01e003,0xc00f001e,0x7800f0,0x3c00780,0x1e003c00,
      0x7,0x800f00f0,0x3c0780,0x1e03c00,0xf01e000,0x7807c00f,0x801e0000,0xf803c0,0x3c000,0xf00000,0x780f0000,0x0,0x7,0xc0000000,
      0x0,0x3c0,0xf000,0x780f00,0x0,0x3c0000,0xf000007,0x80f00000,0x7ff,0xc0000000,0xf0,0x3c00,0x1e03c0,0x0,0x0,0x0,0x0,0x1e000007,
      0x800003c0,0x78000000,0xf00,0x1e0000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x3c1e0000,0x3c1e001f,0xfff03803,0x80001e00,0x1e0,0x780,0xf000,0xf9cf80,
      0x0,0x0,0x0,0x0,0xf000780,0xf00001e,0x0,0xf800000f,0xe780,0x3c00000,0x1e000000,0x1e00f,0x78078,0x7c0000,0x0,0x0,0x0,0x0,0x1e0,
      0x3f003c0,0x1ef0003,0xc000f00f,0x800001e0,0x1f003c0,0x1e00,0xf000,0x1e0007,0x80007800,0x780,0x3c01f000,0x7800001e,0xe00ef07f,
      0x801e01f0,0x1e00780,0x3c07c00,0x78078003,0xc03e0000,0xf000,0xf0003c0,0x78001e0f,0x1e01,0xf01f003c,0xf00000,0x3e0003c,0x7800,
      0x1e0,0x7c0f8,0x0,0x0,0x1,0xe0000000,0x0,0x780000,0x3c,0x0,0x78000,0x0,0x0,0x7800000,0x1e00000,0x0,0x0,0x0,0x0,0x0,0x0,0x3c000,
      0x0,0x0,0x0,0x0,0x0,0x1e,0xf0,0x780,0x0,0x0,0x1e00000,0x0,0x0,0x3c00000,0x0,0x8,0x40,0x0,0x7e0000,0x7c00000,0x1,0xf00f0000,
      0x0,0x3e0000,0x0,0x3f,0xfc0,0xfc3f0,0xfc3f0,0x0,0x0,0x0,0x70,0x39e70000,0x0,0x0,0x0,0x0,0xf003c0,0x0,0x0,0x180000,0xf8000000,
      0x3c0,0xf00003c,0x3c00,0x0,0x3c0078,0x7ff80,0x0,0x0,0x1e,0x3c0000,0x1c0,0x1c000000,0xe,0xf0,0x0,0x0,0x7ffe1c00,0x0,0x0,0x380000f0,
      0x7800000,0x1c00,0xe000,0x3c00,0x0,0x3de000,0x1ef0000,0xf780000,0x7bc00003,0xde00001e,0xf00003c7,0x8000f800,0x78000,0x3c0000,
      0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x1f00ff00,0x3c03e003,0xc01f001e,0xf800f0,0x7c00780,0x3e003c00,
      0xf,0x800f80f0,0x3c0780,0x1e03c00,0xf01e000,0x7803c00f,0x1fffc0,0xf001e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x307,0xe0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1e0000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x3c1e0000,0x781e003f,0xfff03803,
      0x80001e00,0x1e0,0xf80,0xf000,0x3dde00,0x0,0x0,0x0,0x0,0xf000f00,0x780001e,0x0,0x7800000f,0x1e780,0x3c00000,0x3e000000,0x3e00f,
      0x780f0,0x7c0000,0x0,0x0,0x0,0x0,0x1e0,0x7c001e0,0x3ef8003,0xc000f00f,0x1e0,0xf003c0,0x1e00,0xf000,0x1e0007,0x80007800,0x780,
      0x3c03e000,0x7800001e,0xf01ef07b,0xc01e01e0,0xf00780,0x3e07800,0x3c078003,0xe03c0000,0xf000,0xf0003c0,0x78001e0f,0x1e00,0xf01e003e,
      0x1f00000,0x3c0003c,0x7800,0x1e0,0x78078,0x0,0x0,0x1,0xe0000000,0x0,0x780000,0x3c,0x0,0x78000,0x0,0x0,0x7800000,0x1e00000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x3c000,0x0,0x0,0x0,0x0,0x0,0x1e,0xf0,0x780,0x0,0x0,0x1e00000,0x0,0x0,0x3c00000,0x0,0x18,0xc0,0x0,
      0xe70000,0x7800000,0x1,0xe00f0000,0x0,0x3c0000,0x0,0x3f,0xfc0,0xfc1f0,0x1f83f0,0x0,0x0,0x0,0x70,0x39e70000,0x0,0x0,0x0,0x0,
      0xf807c0,0x0,0x0,0x180000,0xf0000000,0x3e0,0x1f00003c,0x3e00,0x0,0x70001c,0x3fff80,0x0,0x0,0x38,0xe0000,0x1c0,0x1c000078,
      0x1c,0x1fe0,0x0,0x0,0xfffe1c00,0x0,0x0,0x380000f0,0x7800000,0x1c00,0xe000,0xe00,0x0,0x7df000,0x3ef8000,0x1f7c0000,0xfbe00007,
      0xdf00003c,0x780003c7,0x8000f000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0xf00f780,
      0x3c03c001,0xe01e000f,0xf00078,0x78003c0,0x3c001e00,0xf,0xf80f0,0x3c0780,0x1e03c00,0xf01e000,0x7803e01f,0x1ffff8,0xf001e0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3,0xe0000000,0x0,0x0,0x0,0x0,0x0,0x0,0xc000,0x0,0x0,0x0,0x0,0x1e0000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x780000,0x3c1e0000,0x781e003e,0x30703803,0x80001e00,0x1e0,0xf00,0x7800,0xff800,0x1e0000,0x0,0x0,0x0,0x1e000f00,0x780001e,
      0x0,0x7800000f,0x3c780,0x3c00000,0x3c000000,0x3c00f,0x780f0,0x3c0000,0x0,0x0,0x2000000,0x800000,0x1e0,0x78000e0,0x3c78003,
      0xc000f01e,0x1e0,0xf803c0,0x1e00,0x1e000,0x1e0007,0x80007800,0x780,0x3c07c000,0x7800001e,0x701cf07b,0xc01e01e0,0xf00780,0x1e07800,
      0x3c078001,0xe03c0000,0xf000,0xf0003c0,0x7c003e0f,0x1e00,0xf83e001e,0x1e00000,0x7c0003c,0x3c00,0x1e0,0xf807c,0x0,0x0,0x1fe0001,
      0xe1fc0000,0x7f00003,0xf8780007,0xf000003c,0x7f0,0x783f0,0x0,0x0,0x7800000,0x1e00000,0x3e0f8000,0xfc00007,0xf8000007,0xf00001fc,
      0xf,0xc0003fc0,0x3c000,0x0,0x0,0x0,0x0,0x0,0x1e,0xf0,0x780,0x0,0x0,0x3c00000,0x0,0x0,0x3c00000,0x0,0x18,0xc0,0x0,0x1818000,
      0x7800000,0x1,0xe00f0000,0x0,0x7c0000,0x0,0x1f,0x80001f80,0x7c1f8,0x1f83e0,0x0,0x0,0x0,0x70,0x38c70007,0xf8000000,0x7f03,
      0xf0000000,0x0,0x780780,0x0,0x0,0xfe0000,0xf0000000,0x1e0,0x1e00003c,0x3f00,0x0,0xe07f0e,0x7fff80,0x0,0x0,0x70,0x70000,0x1c0,
      0x1c000078,0x3c,0x1fc0,0x0,0x0,0xfffe1c00,0x0,0x0,0x380000f0,0x7800000,0x1c00,0xe000,0xe00,0x0,0x78f000,0x3c78000,0x1e3c0000,
      0xf1e00007,0x8f00003c,0x78000787,0x8001e000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,
      0xf80f780,0x3c03c001,0xe01e000f,0xf00078,0x78003c0,0x3c001e00,0xf,0x1f80f0,0x3c0780,0x1e03c00,0xf01e000,0x7801e01e,0x1ffffc,
      0xf007e0,0x3fc000,0x1fe0000,0xff00000,0x7f800003,0xfc00001f,0xe0000fc0,0xfc00007f,0xfe0,0x7f00,0x3f800,0x1fc000,0x0,0x0,0x0,
      0x1,0xf000001f,0x80000ff0,0x7f80,0x3fc00,0x1fe000,0xff0000,0x1f80000,0x1fc1e000,0x0,0x0,0x0,0x0,0x1e1fc0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x3c1e0000,
      0x781c007c,0x30003803,0x80001f00,0x1e0,0xf00,0x7800,0x7f000,0x1e0000,0x0,0x0,0x0,0x1e000f00,0x780001e,0x0,0x7800000f,0x3c780,
      0x3c00000,0x3c000000,0x3c00f,0x780f0,0x3c0000,0x0,0x0,0x1e000000,0xf00000,0x3e0,0xf0000e0,0x3c78003,0xc000f01e,0x1e0,0x7803c0,
      0x1e00,0x1e000,0x1e0007,0x80007800,0x780,0x3c0f8000,0x7800001e,0x701cf079,0xe01e01e0,0xf00780,0x1e07800,0x3c078001,0xe03c0000,
      0xf000,0xf0003c0,0x3c003c0f,0x3e00,0x787c001f,0x3e00000,0xf80003c,0x3c00,0x1e0,0x1f003e,0x0,0x0,0x1fffc001,0xe7ff0000,0x3ffe000f,
      0xfe78003f,0xfc001fff,0xfe001ffc,0xf0078ffc,0x1ffc00,0x7ff000,0x7800f80,0x1e0000f,0x7f1fc01e,0x3ff0001f,0xfe00079f,0xfc0007ff,
      0x3c003c7f,0xf001fff8,0x1fffff0,0x3c003c0,0xf0000f1e,0xf1f,0x7c1f0,0x1f00ff,0xffe0001e,0xf0,0x780,0x0,0x0,0x3c00000,0x100000,
      0x0,0x7800000,0x0,0x18,0xc0,0x0,0x1818000,0x7800000,0x1,0xe00f0000,0x1000000,0xf80000,0x40000002,0xf,0x80001f00,0x7e0f8,0x1f07c0,
      0x0,0x0,0x0,0x70,0x38c7003f,0xff000000,0xff8f,0xf8000100,0xffffe,0x7c0f80,0x0,0x0,0x3ffc000,0xf0000020,0x1001f0,0x3c00003c,
      0x1f80,0x0,0x1c3ffc7,0x7c0780,0x0,0x0,0xe3,0xff038000,0xe0,0x38000078,0x78,0x1ff0,0x0,0x3c003c0,0xfffe1c00,0x0,0x0,0x380000f0,
      0x7800000,0x1c00,0xe000,0xe00,0xf000,0x78f000,0x3c78000,0x1e3c0000,0xf1e00007,0x8f00003c,0x78000787,0x8001e000,0x78000,0x3c0000,
      0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x780f3c0,0x3c03c001,0xe01e000f,0xf00078,0x78003c0,0x3c001e00,
      0x4000200f,0x3f80f0,0x3c0780,0x1e03c00,0xf01e000,0x7801f03e,0x1ffffe,0xf01fe0,0x3fff800,0x1fffc000,0xfffe0007,0xfff0003f,
      0xff8001ff,0xfc003ff3,0xfe0003ff,0xe0007ff8,0x3ffc0,0x1ffe00,0xfff000,0x3ff80001,0xffc0000f,0xfe00007f,0xf000003f,0xf8003c7f,
      0xe0003ffc,0x1ffe0,0xfff00,0x7ff800,0x3ffc000,0x1f80000,0xfff1c03c,0x3c01e0,0x1e00f00,0xf007800,0x781f0001,0xf01e7ff0,0x7c0007c,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,
      0x3c1e003f,0xfffff078,0x30003803,0x80000f00,0x1e0,0x1f00,0x7800,0x7f000,0x1e0000,0x0,0x0,0x0,0x3c000f00,0x780001e,0x0,0x7800000f,
      0x78780,0x3c00000,0x3c000000,0x7c00f,0x780f0,0x3c0007,0xe000003f,0x0,0xfe000000,0xfe0000,0x3c0,0x1f000070,0x7c7c003,0xc000f01e,
      0x1e0,0x7803c0,0x1e00,0x1e000,0x1e0007,0x80007800,0x780,0x3c1f0000,0x7800001e,0x783cf079,0xe01e03c0,0xf00780,0x1e0f000,0x3c078001,
      0xe03c0000,0xf000,0xf0003c0,0x3c003c07,0x81f03c00,0x7c7c000f,0x87c00000,0xf00003c,0x1e00,0x1e0,0x3e001f,0x0,0x0,0x3fffe001,
      0xefff8000,0x7fff001f,0xff78007f,0xfe001fff,0xfe003ffe,0xf0079ffe,0x1ffc00,0x7ff000,0x7801f00,0x1e0000f,0xffbfe01e,0x7ff8003f,
      0xff0007bf,0xfe000fff,0xbc003cff,0xf803fffc,0x1fffff0,0x3c003c0,0x78001e1e,0xf0f,0x800f80f0,0x1e00ff,0xffe0001e,0xf0,0x780,
      0x0,0x0,0x3c00000,0x380000,0x0,0x7800000,0x0,0x18,0xc0,0x0,0x1008000,0x7800000,0x3,0xe00f0000,0x3800000,0xf00000,0xe0000007,
      0xf,0x80001f00,0x3e0f8,0x1e07c0,0x0,0x0,0x0,0x70,0x3807007f,0xff800000,0x1ffdf,0xfc000380,0xffffe,0x3e1f00,0x0,0x0,0xfffe000,
      0xf0000030,0x3800f8,0x7c00003c,0xfc0,0x0,0x18780c3,0xf00780,0x80100,0x0,0xc3,0xffc18000,0xf0,0x78000078,0xf0,0xf0,0x0,0x3c003c0,
      0xfffe1c00,0x0,0x0,0x380000f0,0x7800801,0x1c00,0xe000,0x1e00,0xf000,0xf8f800,0x7c7c000,0x3e3e0001,0xf1f0000f,0x8f80007c,0x7c000787,
      0x8001e000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x780f3c0,0x3c078001,0xe03c000f,
      0x1e00078,0xf0003c0,0x78001e00,0xe000701f,0x3fc0f0,0x3c0780,0x1e03c00,0xf01e000,0x7800f87c,0x1e007f,0xf07e00,0x7fffc00,0x3fffe001,
      0xffff000f,0xfff8007f,0xffc003ff,0xfe007ff7,0xff0007ff,0xf000fffc,0x7ffe0,0x3fff00,0x1fff800,0x3ff80001,0xffc0000f,0xfe00007f,
      0xf00000ff,0xf8003cff,0xf0007ffe,0x3fff0,0x1fff80,0xfffc00,0x7ffe000,0x1f80001,0xfffb803c,0x3c01e0,0x1e00f00,0xf007800,0x780f0001,
      0xe01efff8,0x3c00078,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x780000,0x3c1e003f,0xfffff078,0x30001c07,0xf80,0x1e0,0x1e00,0x3c00,0xff800,0x1e0000,0x0,0x0,0x0,0x3c001e00,
      0x3c0001e,0x0,0x7800001e,0x70780,0x3c00000,0x78000000,0x78007,0x800f00f0,0x3e0007,0xe000003f,0x3,0xfe000000,0xff8000,0x7c0,
      0x1e000070,0x783c003,0xc001f01e,0x1e0,0x7803c0,0x1e00,0x1e000,0x1e0007,0x80007800,0x780,0x3c3e0000,0x7800001e,0x3838f079,
      0xe01e03c0,0x780780,0x1e0f000,0x1e078001,0xe03c0000,0xf000,0xf0003c0,0x3c007c07,0x81f03c00,0x3ef80007,0x87800000,0x1f00003c,
      0x1e00,0x1e0,0x7c000f,0x80000000,0x0,0x3ffff001,0xffffc000,0xffff003f,0xff7800ff,0xff001fff,0xfe007ffe,0xf007bffe,0x1ffc00,
      0x7ff000,0x7803e00,0x1e0000f,0xffffe01e,0xfff8007f,0xff8007ff,0xff001fff,0xbc003dff,0xf807fffc,0x1fffff0,0x3c003c0,0x78001e0f,
      0x1e07,0xc01f00f0,0x1e00ff,0xffe0001e,0xf0,0x780,0x0,0x0,0x7c00000,0x7c0000,0x0,0x7800000,0x0,0x18,0xc0,0x0,0x1018000,0x7800000,
      0x3,0xc00f0000,0x7c00000,0x1f00001,0xf000000f,0x80000007,0xc0003e00,0x1e07c,0x3e0780,0x0,0x0,0x0,0x70,0x380700ff,0xff800000,
      0x3ffff,0xfe0007c0,0xffffe,0x1e1e00,0x0,0x780000,0x1fffe000,0xf0000078,0x7c0078,0x7800003c,0xff0,0x0,0x38e0003,0x80f00780,
      0x180300,0x0,0x1c3,0x81e1c000,0x7f,0xf0000078,0x1e0,0x38,0x0,0x3c003c0,0xfffe1c00,0x0,0x0,0x380000f0,0x7800c01,0x80001c00,
      0xe000,0x603e00,0xf000,0xf07800,0x783c000,0x3c1e0001,0xe0f0000f,0x7800078,0x3c000f87,0x8001e000,0x78000,0x3c0000,0x1e00000,
      0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x780f3c0,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f01,0xf000f81e,
      0x7bc0f0,0x3c0780,0x1e03c00,0xf01e000,0x78007878,0x1e001f,0xf0f800,0x7fffe00,0x3ffff001,0xffff800f,0xfffc007f,0xffe003ff,
      0xff007fff,0xff800fff,0xf001fffe,0xffff0,0x7fff80,0x3fffc00,0x3ff80001,0xffc0000f,0xfe00007f,0xf00001ff,0xfc003dff,0xf000ffff,
      0x7fff8,0x3fffc0,0x1fffe00,0xffff000,0x1f80003,0xffff803c,0x3c01e0,0x1e00f00,0xf007800,0x780f0001,0xe01ffffc,0x3c00078,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,
      0x3c1e003f,0xfffff078,0x30001e0f,0x300780,0x1e0,0x1e00,0x3c00,0x3dde00,0x1e0000,0x0,0x0,0x0,0x78001e00,0x3c0001e,0x0,0xf800003e,
      0xf0780,0x3dfc000,0x783f8000,0xf8007,0xc01f00f0,0x3e0007,0xe000003f,0x1f,0xfc000000,0x7ff000,0xf80,0x3e007c70,0x783c003,0xc001e03c,
      0x1e0,0x3c03c0,0x1e00,0x3c000,0x1e0007,0x80007800,0x780,0x3c7c0000,0x7800001e,0x3878f078,0xf01e03c0,0x780780,0x1e0f000,0x1e078001,
      0xe03e0000,0xf000,0xf0003c0,0x1e007807,0x83f03c00,0x3ef00007,0xcf800000,0x3e00003c,0xf00,0x1e0,0xf80007,0xc0000000,0x0,0x3e01f801,
      0xfe07e001,0xf80f007e,0x7f801f8,0x1f801fff,0xfe00fc0f,0xf007f83f,0x1ffc00,0x7ff000,0x7807c00,0x1e0000f,0x87e1e01f,0xe0fc00fc,
      0xfc007f8,0x1f803f03,0xfc003df0,0x3807e03c,0x1fffff0,0x3c003c0,0x78003e0f,0x1e03,0xe03e00f8,0x3e00ff,0xffe0001e,0xf0,0x780,
      0x0,0x0,0x7800000,0xfe0000,0x0,0x7800000,0x0,0x18,0xc0,0x0,0x1818000,0x7c00000,0x3,0xc00f0000,0xfe00000,0x3e00003,0xf800001f,
      0xc0000007,0xc0003e00,0x1e03c,0x3c0f80,0x0,0x0,0x0,0x70,0x380700fc,0x7800000,0x7c1fe,0x3e000fe0,0xffffe,0x1f3e00,0x0,0x780000,
      0x3f98e000,0xf000003c,0xfcf8007c,0xf800003c,0x3ffc,0x0,0x31c0001,0x80f00f80,0x380700,0x0,0x183,0x80e0c000,0x3f,0xe0000078,
      0x3c0,0x38,0x0,0x3c003c0,0xfffe1c00,0x0,0x0,0x38000078,0xf000e01,0xc003ffe0,0x1fff00,0x7ffc00,0xf000,0xf07800,0x783c000,0x3c1e0001,
      0xe0f0000f,0x7800078,0x3c000f07,0x8003c000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,
      0x3c0f1e0,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f00,0xf801f01e,0xf3c0f0,0x3c0780,0x1e03c00,0xf01e000,0x78007cf8,
      0x1e000f,0x80f0f000,0x7c03f00,0x3e01f801,0xf00fc00f,0x807e007c,0x3f003e0,0x1f80707f,0x8f801f80,0xf003f03f,0x1f81f8,0xfc0fc0,
      0x7e07e00,0x3ff80001,0xffc0000f,0xfe00007f,0xf00003ff,0xfc003fc1,0xf801f81f,0x800fc0fc,0x7e07e0,0x3f03f00,0x1f81f800,0x1f80007,
      0xe07f003c,0x3c01e0,0x1e00f00,0xf007800,0x780f8003,0xe01fe07e,0x3e000f8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x3f,0xfffff078,0x30000ffe,0x1f007c0,0x0,0x1e00,
      0x3c00,0xf9cf80,0x1e0000,0x0,0x0,0x0,0x78001e00,0x3c0001e,0x0,0xf00000fc,0x1e0780,0x3fff800,0x78ffe000,0xf0003,0xe03e00f0,
      0x3e0007,0xe000003f,0x7f,0xe01fffff,0xf00ffc00,0x1f80,0x3c01ff70,0x783c003,0xc007e03c,0x1e0,0x3c03c0,0x1e00,0x3c000,0x1e0007,
      0x80007800,0x780,0x3cfc0000,0x7800001e,0x3c78f078,0xf01e03c0,0x780780,0x3e0f000,0x1e078003,0xc01f0000,0xf000,0xf0003c0,0x1e007807,
      0x83f83c00,0x1ff00003,0xcf000000,0x3e00003c,0xf00,0x1e0,0x0,0x0,0x0,0x20007801,0xfc03e003,0xe003007c,0x3f803e0,0x7c0003c,
      0xf807,0xf007e00f,0x3c00,0xf000,0x780f800,0x1e0000f,0x87e1f01f,0x803c00f8,0x7c007f0,0xf803e01,0xfc003f80,0x80f8004,0x3c000,
      0x3c003c0,0x3c003c0f,0x1e03,0xe03e0078,0x3c0000,0x7c0001e,0xf0,0x780,0x0,0x0,0x3ffff800,0x1ff0000,0x0,0x7800000,0x0,0x18,
      0xc0,0x0,0x1818000,0x3e00000,0x3,0xc00f0000,0x1ff00000,0x3e00007,0xfc00003f,0xe0000003,0xc0003c00,0xf03c,0x3c0f00,0x0,0x0,
      0x0,0x70,0x380701f0,0x800000,0x780fc,0x1e001ff0,0x7c,0xf3c00,0x0,0x780000,0x7e182000,0xf000001f,0xfff00ffc,0xffc0003c,0x3cfe,
      0x0,0x31c0001,0x80f01f80,0x780f00,0x0,0x183,0x80e0c000,0xf,0x80000078,0x780,0x38,0x0,0x3c003c0,0x7ffe1c00,0x0,0x0,0x38000078,
      0xf000f01,0xe003ffe0,0x1fff00,0x7ff800,0xf000,0xf07800,0x783c000,0x3c1e0001,0xe0f0000f,0x78000f8,0x3e000f07,0x8003c000,0x78000,
      0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x3c0f1e0,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,
      0x78000f00,0x7c03e01e,0x1e3c0f0,0x3c0780,0x1e03c00,0xf01e000,0x78003cf0,0x1e0007,0x80f1e000,0x4000f00,0x20007801,0x3c008,
      0x1e0040,0xf00200,0x780403f,0x7803e00,0x3007c00f,0x803e007c,0x1f003e0,0xf801f00,0x780000,0x3c00000,0x1e000000,0xf00007f0,
      0x3e003f00,0x7801f00f,0x800f807c,0x7c03e0,0x3e01f00,0x1f00f800,0x1f80007,0xc03e003c,0x3c01e0,0x1e00f00,0xf007800,0x78078003,
      0xc01fc03e,0x1e000f0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x780000,0x0,0xf078007c,0x300007fc,0x7e00fe0,0x0,0x1e00,0x3c00,0x3e1c3e0,0x1e0000,0x0,0x0,0x0,0xf0001e00,
      0x3c0001e,0x1,0xf000fff8,0x1e0780,0x3fffe00,0x79fff000,0x1f0001,0xfffc00f0,0x7e0007,0xe000003f,0x3ff,0x801fffff,0xf003ff80,
      0x3f00,0x3c03fff0,0xf01e003,0xffffc03c,0x1e0,0x3c03ff,0xffc01fff,0xfe03c000,0x1fffff,0x80007800,0x780,0x3df80000,0x7800001e,
      0x1c70f078,0x781e03c0,0x780780,0x3c0f000,0x1e078007,0xc01f8000,0xf000,0xf0003c0,0x1e007807,0x83f83c00,0xfe00003,0xff000000,
      0x7c00003c,0x780,0x1e0,0x0,0x0,0x0,0x7c01,0xf801f007,0xc00100f8,0x1f803c0,0x3c0003c,0x1f003,0xf007c00f,0x80003c00,0xf000,
      0x783f000,0x1e0000f,0x3c0f01f,0x3e01f0,0x3e007e0,0x7c07c00,0xfc003f00,0xf0000,0x3c000,0x3c003c0,0x3c003c0f,0x1e01,0xf07c007c,
      0x7c0000,0xfc0001e,0xf0,0x780,0x0,0x0,0x3ffff000,0x3838000,0x0,0x7800000,0x0,0x18,0xc0,0x0,0xff0000,0x3f00000,0x3,0xc00fff00,
      0x38380000,0x7c0000e,0xe000070,0x70000001,0xe0003c00,0xf01e,0x780e00,0x0,0x0,0x0,0x0,0x1e0,0x0,0x780f8,0xf003838,0xfc,0xffc00,
      0x0,0x780000,0x7c180000,0xf000000f,0xffe00fff,0xffc0003c,0x783f,0x80000000,0x6380000,0xc0f83f80,0xf81f00,0x0,0x303,0x80e06000,
      0x0,0x78,0xf00,0x78,0x0,0x3c003c0,0x7ffe1c00,0x0,0x0,0x3800003c,0x3e000f81,0xf003ffe0,0x1fff00,0x1fc000,0xf000,0x1e03c00,
      0xf01e000,0x780f0003,0xc078001e,0x3c000f0,0x1e000f07,0xff83c000,0x7ffff,0x803ffffc,0x1ffffe0,0xfffff00,0xf00000,0x7800000,
      0x3c000001,0xe0001e00,0x3c0f0f0,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f00,0x3e07c01e,0x1e3c0f0,0x3c0780,0x1e03c00,
      0xf01e000,0x78003ff0,0x1e0007,0x80f1e000,0xf80,0x7c00,0x3e000,0x1f0000,0xf80000,0x7c0001e,0x3c07c00,0x10078007,0x803c003c,
      0x1e001e0,0xf000f00,0x780000,0x3c00000,0x1e000000,0xf00007c0,0x1e003e00,0x7c03e007,0xc01f003e,0xf801f0,0x7c00f80,0x3e007c00,
      0xf,0x801f003c,0x3c01e0,0x1e00f00,0xf007800,0x7807c007,0xc01f801f,0x1f001f0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x0,0xe078003c,0x300001f0,0x3f801ff0,0x0,
      0x3c00,0x1e00,0x3c1c1e0,0x1e0000,0x0,0x0,0x0,0xf0001e0f,0x3c0001e,0x3,0xe000fff0,0x3c0780,0x3ffff00,0x7bfff800,0x1e0000,0x7ff00078,
      0x7e0007,0xe000003f,0x1ffc,0x1fffff,0xf0007ff0,0x7e00,0x3c07c3f0,0xf01e003,0xffff003c,0x1e0,0x3c03ff,0xffc01fff,0xfe03c000,
      0x1fffff,0x80007800,0x780,0x3ffc0000,0x7800001e,0x1ef0f078,0x781e03c0,0x780780,0x7c0f000,0x1e07801f,0x800ff000,0xf000,0xf0003c0,
      0xf00f807,0x83b83c00,0xfc00001,0xfe000000,0xf800003c,0x780,0x1e0,0x0,0x0,0x0,0x3c01,0xf000f007,0xc00000f0,0xf80780,0x3c0003c,
      0x1e001,0xf007c007,0x80003c00,0xf000,0x787e000,0x1e0000f,0x3c0f01f,0x1e01e0,0x1e007c0,0x3c07800,0x7c003f00,0xf0000,0x3c000,
      0x3c003c0,0x3e007c07,0x80003c00,0xf8f8003c,0x780000,0xf80001e,0xf0,0x780,0x0,0x0,0x7ffff000,0x601c000,0x3,0xffff0000,0x0,
      0xfff,0xf8007fff,0xc0000000,0x7e003c,0x1fe0000,0xc0003,0xc00fff00,0x601c0000,0xf800018,0x70000c0,0x38000001,0xe0007800,0x701e,
      0x701e00,0x0,0x0,0x0,0x0,0x1e0,0x6,0x700f8,0xf00601c,0xf8,0x7f800,0x0,0x780000,0xf8180000,0xf000000f,0x87c00fff,0xffc0003c,
      0xf01f,0xc0000000,0x6380000,0xc07ff780,0x1f03e03,0xfffffe00,0x303,0x81c06000,0x0,0x1ffff,0xfe001e00,0x180f8,0x0,0x3c003c0,
      0x3ffe1c00,0x3f00000,0x0,0x3800003f,0xfe0007c0,0xf8000000,0x18000000,0xc0000006,0x1f000,0x1e03c00,0xf01e000,0x780f0003,0xc078001e,
      0x3c000f0,0x1e001f07,0xff83c000,0x7ffff,0x803ffffc,0x1ffffe0,0xfffff00,0xf00000,0x7800000,0x3c000001,0xe000fff8,0x3c0f0f0,
      0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f00,0x1f0f801e,0x3c3c0f0,0x3c0780,0x1e03c00,0xf01e000,0x78001fe0,0x1e0007,
      0x80f1e000,0x780,0x3c00,0x1e000,0xf0000,0x780000,0x3c0001e,0x3c07c00,0xf0007,0x8078003c,0x3c001e0,0x1e000f00,0x780000,0x3c00000,
      0x1e000000,0xf0000f80,0x1f003e00,0x3c03c003,0xc01e001e,0xf000f0,0x7800780,0x3c003c00,0xf,0x3f003c,0x3c01e0,0x1e00f00,0xf007800,
      0x7803c007,0x801f000f,0xf001e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1,0xe078003f,0xb0000000,0xfc003cf0,0x0,0x3c00,0x1e00,0x101c040,0x1e0000,0x0,0x0,0x1,
      0xe0001e1f,0x83c0001e,0x7,0xe000fff0,0x3c0780,0x3c03f80,0x7fc0fc00,0x1e0000,0xfff80078,0xfe0007,0xe000003f,0x7fe0,0x1fffff,
      0xf0000ffc,0xfc00,0x780f81f0,0xf01e003,0xffff003c,0x1e0,0x3c03ff,0xffc01fff,0xfe03c000,0x1fffff,0x80007800,0x780,0x3ffc0000,
      0x7800001e,0x1ef0f078,0x3c1e03c0,0x780780,0x1fc0f000,0x1e07ffff,0x7ff00,0xf000,0xf0003c0,0xf00f007,0xc3b87c00,0x7c00001,0xfe000000,
      0xf800003c,0x3c0,0x1e0,0x0,0x0,0x0,0x3c01,0xf000f007,0x800000f0,0xf80780,0x1e0003c,0x1e001,0xf0078007,0x80003c00,0xf000,0x78fc000,
      0x1e0000f,0x3c0f01e,0x1e01e0,0x1e007c0,0x3c07800,0x7c003e00,0xf0000,0x3c000,0x3c003c0,0x1e007807,0x80003c00,0x7df0003c,0x780000,
      0x1f00001e,0xf0,0x780,0x0,0x0,0x7800000,0xe7ce000,0x3,0xffff0000,0x0,0xfff,0xf8007fff,0xc0000000,0x1f0,0xffe000,0x1c0003,
      0xc00fff00,0xe7ce0000,0xf800039,0xf38001cf,0x9c000000,0xe0007800,0x780e,0x701c00,0x0,0x0,0x0,0x0,0x1e0,0x7,0xf0078,0xf00e7ce,
      0x1f0,0x7f800,0x0,0x780000,0xf0180000,0xf000000e,0x1c0001f,0xe000003c,0xf007,0xe0000000,0x6380000,0xc03fe780,0x3e07c03,0xfffffe00,
      0x303,0xffc06000,0x0,0x1ffff,0xfe003ffe,0x1fff0,0x0,0x3c003c0,0x1ffe1c00,0x3f00000,0x7,0xffc0001f,0xfc0003e0,0x7c000001,0xfc00000f,
      0xe000007f,0x1e000,0x1e03c00,0xf01e000,0x780f0003,0xc078001e,0x3c000f0,0x1e001e07,0xff83c000,0x7ffff,0x803ffffc,0x1ffffe0,
      0xfffff00,0xf00000,0x7800000,0x3c000001,0xe000fff8,0x3c0f078,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f00,0xf9f001e,
      0x783c0f0,0x3c0780,0x1e03c00,0xf01e000,0x78001fe0,0x1e0007,0x80f1e000,0x780,0x3c00,0x1e000,0xf0000,0x780000,0x3c0001e,0x3c07800,
      0xf0003,0xc078001e,0x3c000f0,0x1e000780,0x780000,0x3c00000,0x1e000000,0xf0000f00,0xf003c00,0x3c03c003,0xc01e001e,0xf000f0,
      0x7800780,0x3c003c00,0xf,0x7f003c,0x3c01e0,0x1e00f00,0xf007800,0x7803c007,0x801f000f,0xf001e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1,0xe070001f,0xf8000007,
      0xf0007cf8,0x7800000,0x3c00,0x1e00,0x1c000,0x1e0000,0x0,0x0,0x1,0xe0001e1f,0x83c0001e,0xf,0xc000fff8,0x780780,0x2000f80,0x7f803e00,
      0x3e0003,0xfffe007c,0x1fe0000,0x0,0x3ff00,0x0,0x1ff,0x8001f000,0x780f00f0,0x1f00f003,0xffffc03c,0x1e0,0x3c03ff,0xffc01fff,
      0xfe03c00f,0xf81fffff,0x80007800,0x780,0x3ffe0000,0x7800001e,0xee0f078,0x3c1e03c0,0x7807ff,0xff80f000,0x1e07fffe,0x3ffe0,
      0xf000,0xf0003c0,0xf00f003,0xc7bc7800,0xfc00000,0xfc000001,0xf000003c,0x3c0,0x1e0,0x0,0x0,0x0,0x3c01,0xe000f80f,0x800001e0,
      0xf80f00,0x1e0003c,0x3c000,0xf0078007,0x80003c00,0xf000,0x79f8000,0x1e0000f,0x3c0f01e,0x1e03c0,0x1f00780,0x3e0f000,0x7c003e00,
      0xf0000,0x3c000,0x3c003c0,0x1e007807,0x81e03c00,0x7df0003e,0xf80000,0x3e00003e,0xf0,0x7c0,0xfc000,0x80000000,0x7800000,0x1e7cf000,
      0x3,0xffff0000,0x0,0x18,0xc0,0x0,0xf80,0x7ffc00,0x380003,0xc00fff01,0xe7cf0000,0x1f000079,0xf3c003cf,0x9e000000,0xe0007000,
      0x380e,0xe01c00,0x0,0x0,0x0,0x0,0x1e0,0x3,0x800f0078,0xf01e7cf,0x3e0,0x3f000,0x0,0x780000,0xf018001f,0xfff8001e,0x1e0000f,
      0xc000003c,0xf003,0xe0000000,0x6380000,0xc00fc780,0x7c0f803,0xfffffe00,0x303,0xfe006000,0x0,0x1ffff,0xfe003ffe,0x1ffe0,0x0,
      0x3c003c0,0xffe1c00,0x3f00000,0x7,0xffc00007,0xf00001f0,0x3e00001f,0xfc0000ff,0xe00007ff,0x3e000,0x3e01e00,0x1f00f000,0xf8078007,
      0xc03c003e,0x1e001e0,0xf001e07,0xff83c000,0x7ffff,0x803ffffc,0x1ffffe0,0xfffff00,0xf00000,0x7800000,0x3c000001,0xe000fff8,
      0x3c0f078,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f00,0x7fe001e,0xf03c0f0,0x3c0780,0x1e03c00,0xf01e000,0x78000fc0,
      0x1e0007,0x80f1f000,0x780,0x3c00,0x1e000,0xf0000,0x780000,0x3c0001e,0x3c0f800,0x1e0003,0xc0f0001e,0x78000f0,0x3c000780,0x780000,
      0x3c00000,0x1e000000,0xf0000f00,0xf003c00,0x3c078003,0xe03c001f,0x1e000f8,0xf0007c0,0x78003e00,0x1e,0xf7803c,0x3c01e0,0x1e00f00,
      0xf007800,0x7803e00f,0x801e000f,0x80f803e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1,0xe0f0000f,0xff00001f,0x8000f87c,0x7800000,0x3c00,0x1e00,0x1c000,0x7fffff80,
      0x0,0x0,0x3,0xc0001e1f,0x83c0001e,0x1f,0x800000fe,0xf00780,0x7c0,0x7f001e00,0x3c0007,0xe03f003f,0x3fe0000,0x0,0x3fc00,0x0,
      0x7f,0x8001e000,0x781f00f0,0x1e00f003,0xc007e03c,0x1e0,0x3c03c0,0x1e00,0x3c00f,0xf81e0007,0x80007800,0x780,0x3f9f0000,0x7800001e,
      0xfe0f078,0x3c1e03c0,0x7807ff,0xff00f000,0x1e07fff8,0xfff8,0xf000,0xf0003c0,0xf81f003,0xc7bc7800,0xfe00000,0x78000003,0xe000003c,
      0x1e0,0x1e0,0x0,0x0,0x0,0x1fffc01,0xe000780f,0x1e0,0x780f00,0x1e0003c,0x3c000,0xf0078007,0x80003c00,0xf000,0x7bf0000,0x1e0000f,
      0x3c0f01e,0x1e03c0,0xf00780,0x1e0f000,0x3c003c00,0xf8000,0x3c000,0x3c003c0,0x1f00f807,0x81f03c00,0x3fe0001e,0xf00000,0x7c00007c,
      0xf0,0x3e0,0x3ff801,0x80000000,0x7800000,0x3cfcf800,0x3,0xffff0000,0x0,0x18,0xc0,0x0,0x7c00,0x1fff00,0x700003,0xc00f0003,
      0xcfcf8000,0x3e0000f3,0xf3e0079f,0x9f000000,0xf000,0x1000,0x0,0x0,0x0,0x0,0x0,0x1f0,0x1,0xc00f0078,0xf03cfcf,0x800007c0,0x1e000,
      0x0,0x780001,0xe018001f,0xfff8001c,0xe00007,0x8000003c,0xf001,0xf0000000,0x6380000,0xc0000000,0xf81f003,0xfffffe00,0x303,
      0x87006000,0x0,0x1ffff,0xfe003ffe,0x7f00,0x0,0x3c003c0,0x3fe1c00,0x3f00000,0x7,0xffc00000,0xf8,0x1f0001ff,0xf0000fff,0x80007ffc,
      0xfc000,0x3c01e00,0x1e00f000,0xf0078007,0x803c003c,0x1e001e0,0xf001e07,0x8003c000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,
      0x7800000,0x3c000001,0xe000fff8,0x3c0f078,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f00,0x3fc001e,0x1e03c0f0,0x3c0780,
      0x1e03c00,0xf01e000,0x78000780,0x1e0007,0x80f0fc00,0x3fff80,0x1fffc00,0xfffe000,0x7fff0003,0xfff8001f,0xffc0001e,0x3c0f000,
      0x1e0003,0xc0f0001e,0x78000f0,0x3c000780,0x780000,0x3c00000,0x1e000000,0xf0001e00,0xf803c00,0x3c078001,0xe03c000f,0x1e00078,
      0xf0003c0,0x78001e07,0xfffffe1e,0x1e7803c,0x3c01e0,0x1e00f00,0xf007800,0x7801e00f,0x1e0007,0x807803c0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x3,0xc0f00007,
      0xffc0007e,0xf03e,0x7800000,0x3c00,0x1e00,0x1c000,0x7fffff80,0x0,0x0,0x3,0xc0001e1f,0x83c0001e,0x3f,0x3e,0xf00780,0x3c0,0x7e001e00,
      0x7c000f,0x800f001f,0xffde0000,0x0,0x3e000,0x0,0xf,0x8003e000,0x781e0070,0x1e00f003,0xc001f03c,0x1e0,0x3c03c0,0x1e00,0x3c00f,
      0xf81e0007,0x80007800,0x780,0x3f1f0000,0x7800001e,0x7c0f078,0x1e1e03c0,0x7807ff,0xfc00f000,0x1e07fffe,0xffc,0xf000,0xf0003c0,
      0x781e003,0xc71c7800,0x1ff00000,0x78000003,0xe000003c,0x1e0,0x1e0,0x0,0x0,0x0,0xffffc01,0xe000780f,0x1e0,0x780fff,0xffe0003c,
      0x3c000,0xf0078007,0x80003c00,0xf000,0x7ff0000,0x1e0000f,0x3c0f01e,0x1e03c0,0xf00780,0x1e0f000,0x3c003c00,0x7f000,0x3c000,
      0x3c003c0,0xf00f007,0xc1f07c00,0x1fc0001f,0x1f00000,0xfc000ff8,0xf0,0x1ff,0xfffe07,0x80000000,0x7800000,0x7ffcfc00,0x0,0xf000000,
      0x0,0x18,0xc0,0x0,0x3e000,0x1ff80,0xe00003,0xc00f0007,0xffcfc000,0x3e0001ff,0xf3f00fff,0x9f800000,0x6000,0x0,0x0,0x7c000,
      0x0,0x0,0x0,0xfe,0x0,0xe00f007f,0xff07ffcf,0xc0000fc0,0x1e000,0x0,0x780001,0xe018001f,0xfff8001c,0xe00007,0x80000000,0xf800,
      0xf0000000,0x6380000,0xc0000000,0x1f03c000,0x1e00,0x303,0x83806000,0x0,0x78,0x0,0x0,0x0,0x3c003c0,0xfe1c00,0x3f00000,0x0,
      0x0,0x3c,0xf801fff,0xfff8,0x7ffc0,0x1f8000,0x3c01e00,0x1e00f000,0xf0078007,0x803c003c,0x1e001e0,0xf003c07,0x8003c000,0x78000,
      0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x3c0f03c,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,
      0x78000f00,0x1f8001e,0x1e03c0f0,0x3c0780,0x1e03c00,0xf01e000,0x78000780,0x1e000f,0x80f0ff00,0x1ffff80,0xffffc00,0x7fffe003,
      0xffff001f,0xfff800ff,0xffc007ff,0xffc0f000,0x1fffff,0xc0fffffe,0x7fffff0,0x3fffff80,0x780000,0x3c00000,0x1e000000,0xf0001e00,
      0x7803c00,0x3c078001,0xe03c000f,0x1e00078,0xf0003c0,0x78001e07,0xfffffe1e,0x3c7803c,0x3c01e0,0x1e00f00,0xf007800,0x7801f01f,
      0x1e0007,0x807c07c0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x780000,0x3,0xc0f00000,0xfff003f0,0x1f00f03e,0x7800000,0x3c00,0x1e00,0x1c000,0x7fffff80,0x0,0x7ff80000,0x3,
      0xc0001e0f,0x3c0001e,0x7e,0x1f,0x1e00780,0x3e0,0x7e000f00,0x78000f,0x7800f,0xff9e0000,0x0,0x3fc00,0x0,0x7f,0x8003c000,0x781e0070,
      0x3e00f803,0xc000f03c,0x1e0,0x3c03c0,0x1e00,0x3c00f,0xf81e0007,0x80007800,0x780,0x3e0f8000,0x7800001e,0x7c0f078,0x1e1e03c0,
      0x7807ff,0xf000f000,0x1e07807f,0xfe,0xf000,0xf0003c0,0x781e003,0xc71c7800,0x3ef00000,0x78000007,0xc000003c,0x1e0,0x1e0,0x0,
      0x0,0x0,0x1ffffc01,0xe000780f,0x1e0,0x780fff,0xffe0003c,0x3c000,0xf0078007,0x80003c00,0xf000,0x7ff0000,0x1e0000f,0x3c0f01e,
      0x1e03c0,0xf00780,0x1e0f000,0x3c003c00,0x7ff80,0x3c000,0x3c003c0,0xf00f003,0xc1f07800,0x1fc0000f,0x1e00000,0xf8000ff0,0xf0,
      0xff,0xffffff,0x80000000,0x3fffc000,0xfff9fe00,0x0,0xf000000,0x0,0x18,0xc0,0x0,0x1f0000,0x1fc0,0x1c00003,0xc00f000f,0xff9fe000,
      0x7c0003ff,0xe7f81fff,0x3fc00000,0x0,0x0,0x0,0xfe000,0x1ffffc0f,0xfffffc00,0x0,0xff,0xf0000000,0x700f007f,0xff0fff9f,0xe0000f80,
      0x1e000,0x0,0x780001,0xe018001f,0xfff8001c,0xe00fff,0xffc00000,0xf800,0xf0000000,0x6380000,0xc0ffff80,0x3e078000,0x1e00,0x7ff80303,
      0x83c06000,0x0,0x78,0x0,0x0,0x0,0x3c003c0,0xe1c00,0x3f00000,0x0,0x7f,0xff00001e,0x7c1fff0,0xfff80,0x7ffc00,0x3f0000,0x7c01f00,
      0x3e00f801,0xf007c00f,0x803e007c,0x1f003e0,0xf803c07,0x8003c000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,
      0xe0001e00,0x3c0f03c,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f00,0x1f8001e,0x3c03c0f0,0x3c0780,0x1e03c00,0xf01e000,
      0x78000780,0x1e001f,0xf07f80,0x3ffff80,0x1ffffc00,0xffffe007,0xffff003f,0xfff801ff,0xffc03fff,0xffc0f000,0x1fffff,0xc0fffffe,
      0x7fffff0,0x3fffff80,0x780000,0x3c00000,0x1e000000,0xf0001e00,0x7803c00,0x3c078001,0xe03c000f,0x1e00078,0xf0003c0,0x78001e07,
      0xfffffe1e,0x787803c,0x3c01e0,0x1e00f00,0xf007800,0x7800f01e,0x1e0007,0x803c0780,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1ff,0xffff8000,0x3ff80fc0,0x7fc1e01f,
      0x7800000,0x3c00,0x1e00,0x0,0x7fffff80,0x0,0x7ff80000,0x7,0x80001e00,0x3c0001e,0xfc,0xf,0x1e00780,0x1e0,0x7c000f00,0x78000f,
      0x78007,0xff1e0000,0x0,0x3ff00,0x0,0x1ff,0x8003c000,0x781e0070,0x3c007803,0xc000f03c,0x1e0,0x3c03c0,0x1e00,0x3c000,0x781e0007,
      0x80007800,0x780,0x3c07c000,0x7800001e,0x7c0f078,0xf1e03c0,0x780780,0xf000,0x1e07801f,0x3e,0xf000,0xf0003c0,0x781e003,0xcf1c7800,
      0x3cf80000,0x7800000f,0x8000003c,0xf0,0x1e0,0x0,0x0,0x0,0x3ffffc01,0xe000780f,0x1e0,0x780fff,0xffe0003c,0x3c000,0xf0078007,
      0x80003c00,0xf000,0x7ff8000,0x1e0000f,0x3c0f01e,0x1e03c0,0xf00780,0x1e0f000,0x3c003c00,0x3fff0,0x3c000,0x3c003c0,0xf81f003,
      0xc3b87800,0xf80000f,0x1e00001,0xf0000ff0,0xf0,0xff,0xf03fff,0x80000000,0x3fff8001,0xfff1ff00,0x0,0xf000000,0x0,0x18,0xc0,
      0x0,0x380000,0x7c0,0x3c00003,0xc00f001f,0xff1ff000,0xf80007ff,0xc7fc3ffe,0x3fe00000,0x0,0x0,0x0,0x1ff000,0x7ffffe1f,0xffffff00,
      0x0,0x7f,0xfe000000,0x780f007f,0xff1fff1f,0xf0001f00,0x1e000,0x0,0x780001,0xe0180000,0xf000001c,0xe00fff,0xffc00000,0x7c00,
      0xf0000000,0x31c0001,0x80ffff80,0x3e078000,0x1e00,0x7ff80183,0x81c0c000,0x0,0x78,0x0,0x0,0x0,0x3c003c0,0xe1c00,0x3f00000,
      0x0,0x7f,0xff00001e,0x7c7ff03,0xc03ff8fe,0x1ffc0f0,0x7e0000,0x7800f00,0x3c007801,0xe003c00f,0x1e0078,0xf003c0,0x7803c07,0x8003c000,
      0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x3c0f01e,0x3c078000,0xf03c0007,0x81e0003c,
      0xf0001e0,0x78000f00,0x3fc001e,0x7803c0f0,0x3c0780,0x1e03c00,0xf01e000,0x78000780,0x1e007f,0xf03fe0,0x7ffff80,0x3ffffc01,
      0xffffe00f,0xffff007f,0xfff803ff,0xffc07fff,0xffc0f000,0x1fffff,0xc0fffffe,0x7fffff0,0x3fffff80,0x780000,0x3c00000,0x1e000000,
      0xf0001e00,0x7803c00,0x3c078001,0xe03c000f,0x1e00078,0xf0003c0,0x78001e07,0xfffffe1e,0x707803c,0x3c01e0,0x1e00f00,0xf007800,
      0x7800f01e,0x1e0007,0x803c0780,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1ff,0xffff8000,0x30f81f00,0xffe1e00f,0x87800000,0x3c00,0x1e00,0x0,0x1e0000,0x0,0x7ff80000,
      0x7,0x80001e00,0x3c0001e,0x1f8,0x7,0x83c00780,0x1e0,0x7c000f00,0xf8001e,0x3c001,0xfc1e0000,0x0,0x7fe0,0x0,0xffc,0x3c000,0x781e0070,
      0x3ffff803,0xc000783c,0x1e0,0x3c03c0,0x1e00,0x3c000,0x781e0007,0x80007800,0x780,0x3c07c000,0x7800001e,0x380f078,0xf1e03c0,
      0x780780,0xf000,0x1e07800f,0x8000001e,0xf000,0xf0003c0,0x3c3c003,0xcf1e7800,0x7c780000,0x7800000f,0x8000003c,0xf0,0x1e0,0x0,
      0x0,0x0,0x7f003c01,0xe000780f,0x1e0,0x780fff,0xffe0003c,0x3c000,0xf0078007,0x80003c00,0xf000,0x7f7c000,0x1e0000f,0x3c0f01e,
      0x1e03c0,0xf00780,0x1e0f000,0x3c003c00,0xfff8,0x3c000,0x3c003c0,0x781e003,0xc3b87800,0x1fc00007,0x83e00003,0xe0000ff8,0xf0,
      0x1ff,0xc007fe,0x0,0x7fff8001,0xffe3ff00,0x0,0x1e000000,0x0,0x18,0xc0,0x0,0x0,0x3c0,0x7800003,0xc00f001f,0xfe3ff000,0xf80007ff,
      0x8ffc3ffc,0x7fe00000,0x0,0x0,0x0,0x1ff000,0x0,0x0,0x0,0x1f,0xff000000,0x3c0f007f,0xff1ffe3f,0xf0003e00,0x1e000,0x0,0x780001,
      0xe0180000,0xf000001e,0x1e00fff,0xffc00000,0x3f00,0xf0000000,0x31c0001,0x80ffff80,0x1f03c000,0x1e00,0x7ff80183,0x81c0c000,
      0x0,0x78,0x0,0x0,0x0,0x3c003c0,0xe1c00,0x0,0x0,0x7f,0xff00003c,0xf87f007,0xc03f83ff,0x81fc01f0,0x7c0000,0x7ffff00,0x3ffff801,
      0xffffc00f,0xfffe007f,0xfff003ff,0xff807fff,0x8003c000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,
      0xe0001e00,0x3c0f01e,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f00,0x7fe001e,0xf003c0f0,0x3c0780,0x1e03c00,0xf01e000,
      0x78000780,0x1ffffe,0xf00ff0,0xfe00780,0x7f003c03,0xf801e01f,0xc00f00fe,0x7807f0,0x3c0ffff,0xffc0f000,0x1fffff,0xc0fffffe,
      0x7fffff0,0x3fffff80,0x780000,0x3c00000,0x1e000000,0xf0001e00,0x7803c00,0x3c078001,0xe03c000f,0x1e00078,0xf0003c0,0x78001e00,
      0x1e,0xf07803c,0x3c01e0,0x1e00f00,0xf007800,0x7800783e,0x1e0007,0x801e0f80,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1ff,0xffff8000,0x307c0801,0xe1f1e00f,0x87000000,
      0x3c00,0x1e00,0x0,0x1e0000,0x0,0x7ff80000,0xf,0x1e00,0x3c0001e,0x3f0,0x7,0x83fffffc,0x1e0,0x7c000f00,0xf0001e,0x3c000,0x3e0000,
      0x0,0x1ffc,0x1fffff,0xf0007ff0,0x3c000,0x781e0070,0x7ffffc03,0xc000781e,0x1e0,0x7803c0,0x1e00,0x3c000,0x781e0007,0x80007800,
      0x780,0x3c03e000,0x7800001e,0xf078,0x79e03c0,0x780780,0xf000,0x1e078007,0x8000000f,0xf000,0xf0003c0,0x3c3c001,0xee0ef000,
      0xf87c0000,0x7800001f,0x3c,0x78,0x1e0,0x0,0x0,0x0,0x7c003c01,0xe000780f,0x1e0,0x780f00,0x3c,0x3c000,0xf0078007,0x80003c00,
      0xf000,0x7e3e000,0x1e0000f,0x3c0f01e,0x1e03c0,0xf00780,0x1e0f000,0x3c003c00,0x1ffc,0x3c000,0x3c003c0,0x781e003,0xe3b8f800,
      0x1fc00007,0x83c00007,0xc00000fc,0xf0,0x3e0,0x8001f8,0x0,0x7800000,0xffc7fe00,0x0,0x1e000000,0x0,0x18,0xc0,0x0,0x0,0x1e0,
      0xf000003,0xc00f000f,0xfc7fe001,0xf00003ff,0x1ff81ff8,0xffc00000,0x0,0x0,0x0,0x1ff000,0x0,0x0,0x0,0x3,0xff800000,0x1e0f0078,
      0xffc7f,0xe0007c00,0x1e000,0x0,0x780001,0xe0180000,0xf000000e,0x1c00007,0x80000000,0x1f81,0xe0000000,0x38e0003,0x80000000,
      0xf81f000,0x1e00,0x7ff801c3,0x80e1c000,0x0,0x78,0x0,0x0,0x0,0x3c003c0,0xe1c00,0x0,0x0,0x0,0xf8,0x1f070007,0xc03803ff,0xc1c001f0,
      0xf80000,0xfffff00,0x7ffff803,0xffffc01f,0xfffe00ff,0xfff007ff,0xffc07fff,0x8001e000,0x78000,0x3c0000,0x1e00000,0xf000000,
      0xf00000,0x7800000,0x3c000001,0xe0001e00,0x780f00f,0x3c078000,0xf03c0007,0x81e0003c,0xf0001e0,0x78000f00,0xf9f001e,0xf003c0f0,
      0x3c0780,0x1e03c00,0xf01e000,0x78000780,0x1ffffc,0xf003f8,0xf800780,0x7c003c03,0xe001e01f,0xf00f8,0x7807c0,0x3c0fc1e,0xf000,
      0x1e0000,0xf00000,0x7800000,0x3c000000,0x780000,0x3c00000,0x1e000000,0xf0001e00,0x7803c00,0x3c078001,0xe03c000f,0x1e00078,
      0xf0003c0,0x78001e00,0x1e,0x1e07803c,0x3c01e0,0x1e00f00,0xf007800,0x7800783c,0x1e0007,0x801e0f00,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1ff,0xffff8000,0x303c0001,
      0xc071e007,0xcf000000,0x3c00,0x1e00,0x0,0x1e0000,0x0,0x0,0xf,0xf00,0x780001e,0x7e0,0x7,0x83fffffc,0x1e0,0x7c000f00,0x1f0001e,
      0x3c000,0x3c0000,0x0,0x3ff,0x801fffff,0xf003ff80,0x3c000,0x781e0070,0x7ffffc03,0xc000781e,0x1e0,0x7803c0,0x1e00,0x1e000,0x781e0007,
      0x80007800,0x780,0x3c01f000,0x7800001e,0xf078,0x79e03c0,0xf00780,0xf000,0x3e078007,0xc000000f,0xf000,0xf0003c0,0x3c3c001,
      0xee0ef000,0xf03e0000,0x7800003e,0x3c,0x78,0x1e0,0x0,0x0,0x0,0xf8003c01,0xe000780f,0x1e0,0x780f00,0x3c,0x3c000,0xf0078007,
      0x80003c00,0xf000,0x7c3e000,0x1e0000f,0x3c0f01e,0x1e03c0,0xf00780,0x1e0f000,0x3c003c00,0xfc,0x3c000,0x3c003c0,0x3c3e001,0xe7b8f000,
      0x3fe00007,0xc7c0000f,0xc000003e,0xf0,0x7c0,0x0,0x0,0x7c00000,0x7fcffc00,0x0,0x1e000000,0x0,0x18,0xc0,0x0,0x0,0x1e0,0x1e000003,
      0xc00f0007,0xfcffc003,0xe00001ff,0x3ff00ff9,0xff800000,0x0,0x0,0x0,0x1ff000,0x0,0x0,0x0,0x0,0x1f800000,0xf0f0078,0x7fcff,
      0xc000fc00,0x1e000,0x0,0x780001,0xe0180000,0xf000000f,0x87c00007,0x80000000,0xfe3,0xe0000000,0x18780c3,0x0,0x7c0f800,0x1e00,
      0xc3,0x80e18000,0x0,0x78,0x0,0x0,0x0,0x3c003c0,0xe1c00,0x0,0x0,0x0,0x1f0,0x3e00000f,0xc0000303,0xe00003f0,0xf00000,0xfffff80,
      0x7ffffc03,0xffffe01f,0xffff00ff,0xfff807ff,0xffc07fff,0x8001e000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,
      0x3c000001,0xe0001e00,0x780f00f,0x3c078001,0xe03c000f,0x1e00078,0xf0003c0,0x78001e00,0x1f0f801f,0xe00780f0,0x3c0780,0x1e03c00,
      0xf01e000,0x78000780,0x1ffff8,0xf000f8,0x1f000780,0xf8003c07,0xc001e03e,0xf01f0,0x780f80,0x3c1f01e,0xf000,0x1e0000,0xf00000,
      0x7800000,0x3c000000,0x780000,0x3c00000,0x1e000000,0xf0001e00,0x7803c00,0x3c078001,0xe03c000f,0x1e00078,0xf0003c0,0x78001e00,
      0x1e,0x3c07803c,0x3c01e0,0x1e00f00,0xf007800,0x78007c7c,0x1e0007,0x801f1f00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0x81c00000,0x303c0003,0x8039e003,0xef000000,
      0x3c00,0x1e00,0x0,0x1e0000,0x0,0x0,0x1e,0xf00,0x780001e,0xfc0,0x7,0x83fffffc,0x1e0,0x3c000f00,0x1e0001e,0x3c000,0x3c0000,
      0x0,0x7f,0xe01fffff,0xf00ffc00,0x3c000,0x781f00f0,0x7ffffc03,0xc000781e,0x1e0,0x7803c0,0x1e00,0x1e000,0x781e0007,0x80007800,
      0x780,0x3c01f000,0x7800001e,0xf078,0x7de01e0,0xf00780,0x7800,0x3c078003,0xc000000f,0xf000,0xf0003c0,0x3e7c001,0xee0ef001,
      0xf01e0000,0x7800003e,0x3c,0x3c,0x1e0,0x0,0x0,0x0,0xf0003c01,0xe000780f,0x1e0,0x780f00,0x3c,0x3c000,0xf0078007,0x80003c00,
      0xf000,0x781f000,0x1e0000f,0x3c0f01e,0x1e03c0,0xf00780,0x1e0f000,0x3c003c00,0x3e,0x3c000,0x3c003c0,0x3c3c001,0xe71cf000,0x7df00003,
      0xc780000f,0x8000003e,0xf0,0x780,0x0,0x0,0x3c00000,0x3fcff800,0x0,0x1e000000,0x0,0x18,0xc0,0x0,0x1f00fc,0x1e0,0x1e000001,
      0xe00f0003,0xfcff8003,0xe00000ff,0x3fe007f9,0xff000000,0x0,0x0,0x0,0x1ff000,0x0,0x0,0x0,0x0,0x7c00000,0xf0f0078,0x3fcff,0x8000f800,
      0x1e000,0x0,0x780001,0xe0180000,0xf000001f,0xffe00007,0x8000003c,0x7ff,0xc0000000,0x1c3ffc7,0x0,0x3e07c00,0x1e00,0xe3,0x80738000,
      0x0,0x78,0x0,0x0,0x0,0x3c003c0,0xe1c00,0x0,0x0,0x0,0x3e0,0x7c00001d,0xc0000001,0xe0000770,0x1f00000,0xfffff80,0x7ffffc03,
      0xffffe01f,0xffff00ff,0xfff807ff,0xffc07fff,0x8001e000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,
      0xe0001e00,0x780f00f,0x3c03c001,0xe01e000f,0xf00078,0x78003c0,0x3c001e00,0x3e07c01f,0xc00780f0,0x3c0780,0x1e03c00,0xf01e000,
      0x78000780,0x1fffc0,0xf0007c,0x1e000780,0xf0003c07,0x8001e03c,0xf01e0,0x780f00,0x3c1e01e,0xf000,0x1e0000,0xf00000,0x7800000,
      0x3c000000,0x780000,0x3c00000,0x1e000000,0xf0001e00,0x7803c00,0x3c078001,0xe03c000f,0x1e00078,0xf0003c0,0x78001e00,0x1e,0x7807803c,
      0x3c01e0,0x1e00f00,0xf007800,0x78003c78,0x1e0007,0x800f1e00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0x83c00000,0x303c0003,0x8039e001,0xee000000,0x1e00,0x3c00,
      0x0,0x1e0000,0x0,0x0,0x1e,0xf00,0x780001e,0x1f80,0x7,0x83fffffc,0x1e0,0x3c000f00,0x1e0001e,0x3c000,0x3c0000,0x0,0x1f,0xfc1fffff,
      0xf07ff000,0x0,0x780f00f0,0x78003c03,0xc000781e,0x1e0,0xf803c0,0x1e00,0x1e000,0x781e0007,0x80007800,0x780,0x3c00f800,0x7800001e,
      0xf078,0x3de01e0,0xf00780,0x7800,0x3c078003,0xe000000f,0xf000,0xf0003c0,0x1e78001,0xfe0ff003,0xe01f0000,0x7800007c,0x3c,0x3c,
      0x1e0,0x0,0x0,0x0,0xf0007c01,0xe000f80f,0x800001e0,0xf80f00,0x3c,0x1e001,0xf0078007,0x80003c00,0xf000,0x780f800,0x1e0000f,
      0x3c0f01e,0x1e03c0,0x1f00780,0x3e0f000,0x7c003c00,0x1e,0x3c000,0x3c003c0,0x3c3c001,0xe71cf000,0xf8f80003,0xe780001f,0x1e,
      0xf0,0x780,0x0,0x0,0x3c00000,0x1ffff000,0x0,0x1e000000,0x0,0x18,0xc0,0x0,0x3bc1de,0x1e0,0xf000001,0xe00f0001,0xffff0007,0xc000007f,
      0xffc003ff,0xfe000000,0x0,0x0,0x0,0xfe000,0x0,0x0,0x0,0x0,0x3c00000,0x1e0f0078,0x1ffff,0x1f000,0x1e000,0x0,0x780000,0xf0180000,
      0xf000001f,0xfff00007,0x8000003c,0x1ff,0x80000000,0xe0ff0e,0x0,0x1f03e00,0x1e00,0x70,0x70000,0x0,0x78,0x0,0x0,0x0,0x3c003c0,
      0xe1c00,0x0,0x0,0x0,0x7c0,0xf8000019,0xc0000000,0xe0000670,0x1e00000,0xf000780,0x78003c03,0xc001e01e,0xf00f0,0x780780,0x3c0f807,
      0x8001e000,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0xf80f007,0xbc03c001,0xe01e000f,
      0xf00078,0x78003c0,0x3c001e00,0x7c03e00f,0x800780f0,0x3c0780,0x1e03c00,0xf01e000,0x78000780,0x1e0000,0xf0003c,0x1e000f80,
      0xf0007c07,0x8003e03c,0x1f01e0,0xf80f00,0x7c1e01e,0xf800,0x1e0000,0xf00000,0x7800000,0x3c000000,0x780000,0x3c00000,0x1e000000,
      0xf0001e00,0x7803c00,0x3c078003,0xe03c001f,0x1e000f8,0xf0007c0,0x78003e00,0x1f8001f,0xf00f803c,0x3c01e0,0x1e00f00,0xf007800,
      0x78003e78,0x1e000f,0x800f9e00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf,0x3c00000,0x303c0003,0x8039f001,0xfe000000,0x1e00,0x3c00,0x0,0x1e0000,0x0,0x0,0x3c,0xf00,
      0x780001e,0x3f00,0x7,0x80000780,0x3e0,0x3e000f00,0x3c0001e,0x3c000,0x7c0000,0x0,0x3,0xfe000000,0xff8000,0x0,0x3c0f81f0,0xf0001e03,
      0xc000780f,0x1e0,0xf003c0,0x1e00,0xf000,0x781e0007,0x80007800,0x780,0x3c007c00,0x7800001e,0xf078,0x3de01e0,0xf00780,0x7800,
      0x3c078001,0xe000000f,0xf000,0xf0003c0,0x1e78001,0xfc07f003,0xe00f0000,0x78000078,0x3c,0x1e,0x1e0,0x0,0x0,0x0,0xf0007c01,
      0xf000f007,0x800000f0,0xf80780,0x3c,0x1e001,0xf0078007,0x80003c00,0xf000,0x7807c00,0x1e0000f,0x3c0f01e,0x1e01e0,0x1e007c0,
      0x3c07800,0x7c003c00,0x1e,0x3c000,0x3c007c0,0x1e78001,0xe71df000,0xf8f80001,0xef80003e,0x1e,0xf0,0x780,0x0,0x0,0x3c00000,
      0xfffe000,0x0,0x3e000000,0x0,0x18,0x7fff,0xc0000000,0x60c306,0x1e0,0x7800001,0xe00f0000,0xfffe0007,0x8000003f,0xff8001ff,
      0xfc000000,0x0,0x0,0x0,0x7c000,0x0,0x0,0x0,0x0,0x3c00000,0x3c0f0078,0xfffe,0x3e000,0x1e000,0x0,0x780000,0xf0180000,0xf000003c,
      0xfcf80007,0x8000003c,0x7f,0x0,0x70001c,0x0,0xf81f00,0x0,0x38,0xe0000,0x0,0x0,0x0,0x0,0x0,0x3c003c0,0xe1c00,0x0,0x0,0x0,0xf81,
      0xf0000039,0xc0000000,0xe0000e70,0x1e00000,0x1e0003c0,0xf0001e07,0x8000f03c,0x781e0,0x3c0f00,0x1e0f007,0x8000f000,0x78000,
      0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0xf00f007,0xbc03c001,0xe01e000f,0xf00078,0x78003c0,
      0x3c001e00,0xf801f00f,0x800780f0,0x3c0780,0x1e03c00,0xf01e000,0x78000780,0x1e0000,0xf0003c,0x1e000f80,0xf0007c07,0x8003e03c,
      0x1f01e0,0xf80f00,0x7c1e01e,0x7800,0xf0000,0x780000,0x3c00000,0x1e000000,0x780000,0x3c00000,0x1e000000,0xf0000f00,0xf003c00,
      0x3c03c003,0xc01e001e,0xf000f0,0x7800780,0x3c003c00,0x1f8000f,0xe00f003c,0x7c01e0,0x3e00f00,0x1f007800,0xf8001ef8,0x1f000f,
      0x7be00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0xf,0x3c00000,0x307c0003,0x8038f000,0xfc000000,0x1e00,0x3c00,0x0,0x1e0000,0xfc0000,0x0,0x7e00003c,0x780,0xf00001e,
      0x7e00,0xf,0x80000780,0x3c0,0x3e001e00,0x3c0001f,0x7c000,0x780007,0xe000003f,0x0,0xfe000000,0xfe0000,0x0,0x3c07c3f0,0xf0001e03,
      0xc000f80f,0x800001e0,0x1f003c0,0x1e00,0xf000,0x781e0007,0x80007800,0x4000f80,0x3c003c00,0x7800001e,0xf078,0x1fe01f0,0x1f00780,
      0x7c00,0x7c078001,0xf000001f,0xf000,0xf0003c0,0x1e78001,0xfc07f007,0xc00f8000,0x780000f8,0x3c,0x1e,0x1e0,0x0,0x0,0x0,0xf0007c01,
      0xf000f007,0xc00000f0,0xf80780,0x3c,0x1f003,0xf0078007,0x80003c00,0xf000,0x7807c00,0x1e0000f,0x3c0f01e,0x1e01e0,0x1e007c0,
      0x3c07800,0x7c003c00,0x1e,0x3c000,0x3c007c0,0x1e78000,0xfe0fe001,0xf07c0001,0xef00007c,0x1e,0xf0,0x780,0x0,0x0,0x1e00000,
      0x7cfc000,0xfc00000,0x3c00000f,0xc3f00000,0x18,0x7fff,0xc0000000,0x406303,0x3e0,0x3c00001,0xf00f0000,0x7cfc000f,0x8000001f,
      0x3f0000f9,0xf8000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c00000,0x780700f8,0x7cfc,0x7c000,0x1e000,0x0,0x780000,0xf8180000,
      0xf0000070,0x3c0007,0x8000003c,0x3f,0x80000000,0x3c0078,0x0,0x780f00,0x0,0x1e,0x3c0000,0x0,0x0,0x0,0x0,0x0,0x3e007c0,0xe1c00,
      0x0,0x0,0x0,0xf01,0xe0000071,0xc0000000,0xe0001c70,0x1e00000,0x1e0003c0,0xf0001e07,0x8000f03c,0x781e0,0x3c0f00,0x1e0f007,
      0x8000f800,0x78000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x1f00f003,0xfc03e003,0xe01f001f,
      0xf800f8,0x7c007c0,0x3e003e01,0xf000f80f,0xf00f0,0x3c0780,0x1e03c00,0xf01e000,0x78000780,0x1e0000,0xf0003c,0x1e000f80,0xf0007c07,
      0x8003e03c,0x1f01e0,0xf80f00,0x7c1e01e,0x7c00,0xf0000,0x780000,0x3c00000,0x1e000000,0x780000,0x3c00000,0x1e000000,0xf0000f00,
      0xf003c00,0x3c03c003,0xc01e001e,0xf000f0,0x7800780,0x3c003c00,0x1f8000f,0xc00f003c,0x7c01e0,0x3e00f00,0x1f007800,0xf8001ef0,
      0x1f000f,0x7bc00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x780000,0xf,0x3800040,0x30780003,0x8038f800,0x78000000,0x1e00,0x3c00,0x0,0x1e0000,0xfc0000,0x0,0x7e000078,
      0x780,0x1f00001e,0xfc00,0x20001f,0x780,0x80007c0,0x1f001e00,0x7c0000f,0x78000,0xf80007,0xe000003f,0x0,0x1e000000,0xf00000,
      0x3c000,0x3c03fff0,0xf0001e03,0xc001f007,0x800101e0,0x7e003c0,0x1e00,0x7800,0x781e0007,0x80007800,0x6000f00,0x3c003e00,0x7800001e,
      0xf078,0x1fe00f0,0x1e00780,0x3c00,0x78078000,0xf020001e,0xf000,0x7800780,0xff0001,0xfc07f00f,0x8007c000,0x780001f0,0x3c,0xf,
      0x1e0,0x0,0x0,0x0,0xf800fc01,0xf801f007,0xc00100f8,0x1f807c0,0x40003c,0xf807,0xf0078007,0x80003c00,0xf000,0x7803e00,0x1f0000f,
      0x3c0f01e,0x1e01f0,0x3e007e0,0x7c07c00,0xfc003c00,0x1e,0x3e000,0x3e007c0,0x1ff8000,0xfe0fe003,0xe03e0001,0xff0000fc,0x1e,
      0xf0,0x780,0x0,0x0,0x1f00080,0x3cf8000,0xfc00000,0x3c00001f,0x83f00000,0x18,0xc0,0x0,0xc06203,0x40003c0,0x1c00000,0xf80f0000,
      0x3cf8001f,0xf,0x3e000079,0xf0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c00000,0x700780fc,0x3cf8,0xfc000,0x1e000,0x0,0x780000,
      0x7c180000,0xf0000020,0x100007,0x8000003c,0xf,0x80000000,0x1f01f0,0x0,0x380700,0x0,0xf,0x80f80000,0x0,0x0,0x0,0x0,0x0,0x3e007c0,
      0xe1c00,0x0,0x0,0x0,0xe01,0xc0000071,0xc0000001,0xc0001c70,0x1e00040,0x1e0003c0,0xf0001e07,0x8000f03c,0x781e0,0x3c0f00,0x1e0f007,
      0x80007800,0x10078000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e00,0x7e00f003,0xfc01e003,0xc00f001e,
      0x7800f0,0x3c00780,0x1e003c00,0xe000700f,0x800f0078,0x7803c0,0x3c01e00,0x1e00f000,0xf0000780,0x1e0000,0xf0003c,0x1f001f80,
      0xf800fc07,0xc007e03e,0x3f01f0,0x1f80f80,0xfc1e01f,0x7c00,0x100f8000,0x807c0004,0x3e00020,0x1f000100,0x780000,0x3c00000,0x1e000000,
      0xf0000f80,0x1f003c00,0x3c03e007,0xc01f003e,0xf801f0,0x7c00f80,0x3e007c00,0x1f8000f,0x801f003e,0x7c01f0,0x3e00f80,0x1f007c00,
      0xf8001ff0,0x1f801f,0x7fc00,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0xf,0x7800078,0x31f80001,0xc070fc00,0xfc000000,0x1e00,0x7c00,0x0,0x1e0000,0xfc0000,0x0,0x7e000078,
      0x7c0,0x1f00001e,0x1f000,0x38003f,0x780,0xe000f80,0x1f803e00,0x780000f,0x800f8000,0x1f00007,0xe000003f,0x0,0x2000000,0x800000,
      0x3c000,0x3e01ff71,0xf0001f03,0xc007f007,0xc00301e0,0x1fc003c0,0x1e00,0x7c00,0x781e0007,0x80007800,0x7801f00,0x3c001f00,0x7800001e,
      0xf078,0xfe00f8,0x3e00780,0x3e00,0xf8078000,0xf838003e,0xf000,0x7c00f80,0xff0000,0xfc07e00f,0x8003c000,0x780001e0,0x3c,0xf,
      0x1e0,0x0,0x0,0x0,0xf801fc01,0xfc03e003,0xe003007c,0x3f803e0,0x1c0003c,0xfc0f,0xf0078007,0x80003c00,0xf000,0x7801f00,0xf8000f,
      0x3c0f01e,0x1e00f8,0x7c007f0,0xf803e01,0xfc003c00,0x8003e,0x1f000,0x1e00fc0,0xff0000,0xfe0fe007,0xc01f0000,0xfe0000f8,0x1e,
      0xf0,0x780,0x0,0x0,0xf80180,0x1cf0000,0x1f800000,0x3c00001f,0x83e00000,0x18,0xc0,0x0,0xc06203,0x70007c0,0xe00000,0x7e0f0000,
      0x1cf0001e,0x7,0x3c000039,0xe0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x100,0x7c00000,0xe00780fc,0x2001cf0,0xf8000,0x1e000,0x0,
      0x780000,0x7e182000,0xf0000000,0x7,0x8000003c,0x7,0xc0000000,0x7ffc0,0x0,0x180300,0x0,0x3,0xffe00000,0x0,0x0,0x0,0x0,0x0,
      0x3f00fc0,0xe1c00,0x0,0x0,0x0,0xc01,0x800000e1,0xc0000003,0xc0003870,0x1f001c0,0x3e0003e1,0xf0001f0f,0x8000f87c,0x7c3e0,0x3e1f00,
      0x1f1e007,0x80007c00,0x30078000,0x3c0000,0x1e00000,0xf000000,0xf00000,0x7800000,0x3c000001,0xe0001e03,0xfc00f001,0xfc01f007,
      0xc00f803e,0x7c01f0,0x3e00f80,0x1f007c00,0x4000201f,0xc01f007c,0xf803e0,0x7c01f00,0x3e00f801,0xf0000780,0x1e0000,0xf0007c,
      0x1f003f80,0xf801fc07,0xc00fe03e,0x7f01f0,0x3f80f80,0x1fc1f03f,0x803e00,0x3007c003,0x803e001c,0x1f000e0,0xf800700,0x780000,
      0x3c00000,0x1e000000,0xf00007c0,0x3e003c00,0x3c01f00f,0x800f807c,0x7c03e0,0x3e01f00,0x1f00f800,0x1f80007,0xc03e001e,0xfc00f0,
      0x7e00780,0x3f003c01,0xf8000fe0,0x1fc03e,0x3f800,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1e,0x780007f,0xfff00001,0xe0f07f03,0xfe000000,0xf00,0x7800,0x0,
      0x1e0000,0xfc0000,0x0,0x7e0000f0,0x3f0,0x7e000fff,0xfc03ffff,0xf83f00fe,0x780,0xfc03f80,0xfc0fc00,0xf800007,0xe03f0018,0x7e00007,
      0xe000003f,0x0,0x0,0x0,0x3c000,0x1e007c71,0xe0000f03,0xffffe003,0xf01f01ff,0xff8003ff,0xffe01e00,0x3f01,0xf81e0007,0x803ffff0,
      0x7e03f00,0x3c000f00,0x7ffffe1e,0xf078,0xfe007e,0xfc00780,0x1f83,0xf0078000,0x783f00fe,0xf000,0x3f03f00,0xff0000,0xfc07e01f,
      0x3e000,0x780003ff,0xfffc003c,0x7,0x800001e0,0x0,0x0,0x0,0x7e07fc01,0xfe07e001,0xf80f007e,0x7f801f8,0xfc0003c,0x7ffe,0xf0078007,
      0x807ffffe,0xf000,0x7801f00,0xfff00f,0x3c0f01e,0x1e00fc,0xfc007f8,0x1f803f03,0xfc003c00,0xf80fc,0x1fff0,0x1f83fc0,0xff0000,
      0xfc07e007,0xc01f0000,0xfe0001ff,0xffe0001e,0xf0,0x780,0x0,0x0,0xfe0780,0xfe0000,0x1f000000,0x3c00001f,0x7c00e03,0x81c00018,
      0xc0,0x0,0x406203,0x7e01fc0,0x700000,0x7fffff80,0xfe0003f,0xffffc003,0xf800001f,0xc0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1f0,
      0x1f800001,0xc007c1fe,0x6000fe0,0x1ffffe,0x1e000,0x0,0x780000,0x3f98e03f,0xffff8000,0x7,0x8000003c,0x7,0xc0000000,0xfe00,
      0x0,0x80100,0x0,0x0,0x7f000000,0x0,0x1ffff,0xfe000000,0x0,0x0,0x3f83fe8,0xe1c00,0x0,0x0,0x0,0x801,0xc1,0xc0000007,0x80003070,
      0xfc0fc0,0x3c0001e1,0xe0000f0f,0x7878,0x3c3c0,0x1e1e00,0xf1e007,0xffc03f01,0xf007ffff,0xc03ffffe,0x1fffff0,0xfffff80,0x7fffe003,
      0xffff001f,0xfff800ff,0xffc01fff,0xf800f001,0xfc00fc1f,0x8007e0fc,0x3f07e0,0x1f83f00,0xfc1f800,0x1f,0xf07e003f,0x3f001f8,
      0x1f800fc0,0xfc007e07,0xe0000780,0x1e0000,0xf301f8,0xfc0ff80,0x7e07fc03,0xf03fe01f,0x81ff00fc,0xff807e0,0x7fc0f87f,0x81801f80,
      0xf003f01f,0x801f80fc,0xfc07e0,0x7e03f00,0xfffffc07,0xffffe03f,0xffff01ff,0xfff807e0,0x7e003c00,0x3c01f81f,0x800fc0fc,0x7e07e0,
      0x3f03f00,0x1f81f800,0x1f8000f,0xe07e001f,0x83fc00fc,0x1fe007e0,0xff003f07,0xf8000fe0,0x1fe07e,0x3f800,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1e,0x780007f,
      0xffe00000,0xffe03fff,0xdf000000,0xf00,0x7800,0x0,0x0,0xfc0000,0x0,0x7e0000f0,0x1ff,0xfc000fff,0xfc03ffff,0xf83ffffc,0x780,
      0xfffff00,0x7fff800,0xf000007,0xffff001f,0xffe00007,0xe000003f,0x0,0x0,0x0,0x3c000,0x1e000001,0xe0000f03,0xffffc001,0xffff01ff,
      0xff0003ff,0xffe01e00,0x1fff,0xf81e0007,0x803ffff0,0x7fffe00,0x3c000f80,0x7ffffe1e,0xf078,0xfe003f,0xff800780,0xfff,0xf0078000,
      0x7c3ffffc,0xf000,0x3ffff00,0xff0000,0xf803e01e,0x1e000,0x780003ff,0xfffc003c,0x7,0x800001e0,0x0,0x0,0x0,0x7fffbc01,0xffffc000,
      0xffff003f,0xfff800ff,0xffc0003c,0x3ffe,0xf0078007,0x807ffffe,0xf000,0x7800f80,0x7ff00f,0x3c0f01e,0x1e007f,0xff8007ff,0xff001fff,
      0xbc003c00,0xffffc,0x1fff0,0x1fffbc0,0xff0000,0x7c07c00f,0x800f8000,0x7e0001ff,0xffe0001e,0xf0,0x780,0x0,0x0,0x7fff80,0x7c0000,
      0x1f000000,0x3c00001e,0x7c00f07,0xc1e00018,0xc0,0x0,0x60e303,0x7ffff80,0x380000,0x3fffff80,0x7c0003f,0xffffc001,0xf000000f,
      0x80000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1ff,0xff800003,0x8003ffff,0xfe0007c0,0x1ffffe,0x1e000,0x0,0x780000,0x1fffe03f,0xffff8000,
      0x7,0x8000003c,0x3,0xc0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1ffff,0xfe000000,0x0,0x0,0x3fffdf8,0xe1c00,0x0,0x0,0x0,0x0,0x1c1,
      0xc000000f,0x7070,0x7fffc0,0x3c0001e1,0xe0000f0f,0x7878,0x3c3c0,0x1e1e00,0xf1e007,0xffc01fff,0xf007ffff,0xc03ffffe,0x1fffff0,
      0xfffff80,0x7fffe003,0xffff001f,0xfff800ff,0xffc01fff,0xf000f001,0xfc007fff,0x3fff8,0x1fffc0,0xfffe00,0x7fff000,0x3b,0xfffc003f,
      0xfff001ff,0xff800fff,0xfc007fff,0xe0000780,0x1e0000,0xf3fff8,0xffff780,0x7fffbc03,0xfffde01f,0xffef00ff,0xff7807ff,0xfbc0ffff,
      0xff800fff,0xf001ffff,0x800ffffc,0x7fffe0,0x3ffff00,0xfffffc07,0xffffe03f,0xffff01ff,0xfff803ff,0xfc003c00,0x3c00ffff,0x7fff8,
      0x3fffc0,0x1fffe00,0xffff000,0x1f,0xfffc001f,0xffbc00ff,0xfde007ff,0xef003fff,0x780007e0,0x1ffffc,0x1f800,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1e,0x700003f,
      0xffc00000,0x7fc01fff,0x9f800000,0xf80,0xf800,0x0,0x0,0xfc0000,0x0,0x7e0000f0,0xff,0xf8000fff,0xfc03ffff,0xf83ffff8,0x780,
      0xffffe00,0x7fff000,0xf000003,0xfffe001f,0xffc00007,0xe000003f,0x0,0x0,0x0,0x3c000,0xf000003,0xe0000f83,0xffff0000,0xffff01ff,
      0xfc0003ff,0xffe01e00,0xfff,0xf01e0007,0x803ffff0,0x7fffc00,0x3c0007c0,0x7ffffe1e,0xf078,0x7e003f,0xff000780,0x7ff,0xe0078000,
      0x3c3ffff8,0xf000,0x1fffe00,0x7e0000,0xf803e03e,0x1f000,0x780003ff,0xfffc003c,0x7,0x800001e0,0x0,0x0,0x0,0x3fff3c01,0xefff8000,
      0x7ffe001f,0xff78007f,0xff80003c,0x1ffc,0xf0078007,0x807ffffe,0xf000,0x78007c0,0x3ff00f,0x3c0f01e,0x1e003f,0xff0007bf,0xfe000fff,
      0xbc003c00,0xffff8,0xfff0,0xfff3c0,0x7e0000,0x7c07c01f,0x7c000,0x7c0001ff,0xffe0001e,0xf0,0x780,0x0,0x0,0x3fff80,0x380000,
      0x3e000000,0x7c00003e,0x7801f07,0xc1e00018,0xc0,0x0,0x39c1ce,0x7ffff00,0x1c0000,0xfffff80,0x380003f,0xffffc000,0xe0000007,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1ff,0xff000007,0x1ffcf,0xfe000380,0x1ffffe,0x1e000,0x0,0x780000,0xfffe03f,0xffff8000,0x7,
      0x8000003c,0x3,0xc0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1ffff,0xfe000000,0x0,0x0,0x3dffdf8,0xe1c00,0x0,0x0,0x0,0x0,0x381,
      0xc000001e,0xe070,0x7fff80,0x7c0001f3,0xe0000f9f,0x7cf8,0x3e7c0,0x1f3e00,0xfbe007,0xffc00fff,0xf007ffff,0xc03ffffe,0x1fffff0,
      0xfffff80,0x7fffe003,0xffff001f,0xfff800ff,0xffc01fff,0xc000f000,0xfc007ffe,0x3fff0,0x1fff80,0xfffc00,0x7ffe000,0x79,0xfff8001f,
      0xffe000ff,0xff0007ff,0xf8003fff,0xc0000780,0x1e0000,0xf3fff0,0x7ffe780,0x3fff3c01,0xfff9e00f,0xffcf007f,0xfe7803ff,0xf3c07ff3,
      0xff8007ff,0xe000ffff,0x7fff8,0x3fffc0,0x1fffe00,0xfffffc07,0xffffe03f,0xffff01ff,0xfff801ff,0xf8003c00,0x3c007ffe,0x3fff0,
      0x1fff80,0xfffc00,0x7ffe000,0x1d,0xfff8000f,0xff3c007f,0xf9e003ff,0xcf001ffe,0x780007c0,0x1efff8,0x1f000,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780000,0x1e,0xf000003,
      0xfe000000,0x1f000fff,0xfc00000,0x780,0xf000,0x0,0x0,0xf80000,0x0,0x7e0001e0,0x7f,0xf0000fff,0xfc03ffff,0xf81ffff0,0x780,
      0x7fff800,0x1ffe000,0x1f000000,0xfff8001f,0xff000007,0xe000003e,0x0,0x0,0x0,0x3c000,0xf800003,0xc0000783,0xfff80000,0x3ffe01ff,
      0xe00003ff,0xffe01e00,0x7ff,0xc01e0007,0x803ffff0,0x3fff800,0x3c0003c0,0x7ffffe1e,0xf078,0x7e000f,0xfe000780,0x3ff,0xc0078000,
      0x3e1fffe0,0xf000,0x7ff800,0x7e0000,0xf803e07c,0xf800,0x780003ff,0xfffc003c,0x3,0xc00001e0,0x0,0x0,0x0,0xffe3c01,0xe7ff0000,
      0x3ffc000f,0xfe78003f,0xfe00003c,0x7f0,0xf0078007,0x807ffffe,0xf000,0x78003e0,0xff00f,0x3c0f01e,0x1e001f,0xfe00079f,0xfc0007ff,
      0x3c003c00,0x7ffe0,0x1ff0,0x7fe3c0,0x7e0000,0x7c07c03e,0x3e000,0x7c0001ff,0xffe0001e,0xf0,0x780,0x0,0x0,0xfff00,0x100000,
      0x3e000000,0x7800003c,0xf800f07,0xc1e00018,0xc0,0x0,0x1f80fc,0x3fffc00,0xc0000,0x3ffff80,0x100003f,0xffffc000,0x40000002,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xff,0xfc000006,0xff87,0xfc000100,0x1ffffe,0x1e000,0x0,0x780000,0x3ffc03f,0xffff8000,0x7,
      0x8000003c,0x3,0xc0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1ffff,0xfe000000,0x0,0x0,0x3dff9f8,0xe1c00,0x0,0x0,0x0,0x0,0x3ff,
      0xf800003c,0xfffe,0x1ffe00,0x780000f3,0xc000079e,0x3cf0,0x1e780,0xf3c00,0x7bc007,0xffc003ff,0xe007ffff,0xc03ffffe,0x1fffff0,
      0xfffff80,0x7fffe003,0xffff001f,0xfff800ff,0xffc01ffc,0xf000,0xfc001ffc,0xffe0,0x7ff00,0x3ff800,0x1ffc000,0x70,0xfff00007,
      0xff80003f,0xfc0001ff,0xe0000fff,0x780,0x1e0000,0xf3ffe0,0x1ffc780,0xffe3c00,0x7ff1e003,0xff8f001f,0xfc7800ff,0xe3c03fe1,
      0xff0003ff,0xc0007ffc,0x3ffe0,0x1fff00,0xfff800,0xfffffc07,0xffffe03f,0xffff01ff,0xfff800ff,0xf0003c00,0x3c003ffc,0x1ffe0,
      0xfff00,0x7ff800,0x3ffc000,0x38,0xfff00007,0xfe3c003f,0xf1e001ff,0x8f000ffc,0x780007c0,0x1e7ff0,0x1f000,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x30000000,
      0x1fc,0x0,0x780,0xf000,0x0,0x0,0x1f80000,0x0,0x1e0,0x1f,0xc0000000,0x0,0x1ff80,0x0,0xffc000,0x7f8000,0x0,0x3fe00007,0xfc000000,
      0x7e,0x0,0x0,0x0,0x0,0x7c00000,0x0,0x0,0xff00000,0x0,0x0,0xfe,0x0,0x0,0x3fc000,0x0,0x0,0x0,0x3,0xf8000000,0xff,0xc0000000,
      0x1ff00,0x0,0x1fe000,0x0,0x0,0x0,0x0,0x3c,0x3,0xc00001e0,0x0,0x0,0x0,0x3f80000,0x1fc0000,0x7f00003,0xf8000007,0xf0000000,
      0x0,0xf0000000,0x0,0xf000,0x0,0x0,0x0,0x7,0xf8000787,0xf00001fc,0x3c000000,0x7f80,0x0,0x1f8000,0x0,0x0,0x0,0x7c000000,0x1e,
      0xf0,0x780,0x0,0x0,0x3fc00,0x0,0x3c000000,0x7800003c,0xf000601,0xc00018,0xc0,0x0,0x0,0x3fe000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0xf,0xf0000000,0x7e03,0xf0000000,0x0,0x0,0x0,0x0,0xfe0000,0x0,0x0,0x3c,0x2007,0x80000000,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c7e0f0,0xe1c00,0x0,0x3800000,0x0,0x0,0x3ff,0xf8000078,0xfffe,0x7f800,0x0,0x0,0x0,0x0,
      0x0,0x0,0xff,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7f0,0x3f80,0x1fc00,0xfe000,0x7f0000,0x70,0x3fc00001,0xfe00000f,0xf000007f,
      0x800003fc,0x0,0x0,0xff00,0x7f0000,0x3f80000,0x1fc00000,0xfe000007,0xf000003f,0x80001f80,0xfc00007f,0xfe0,0x7f00,0x3f800,
      0x1fc000,0x0,0x0,0x0,0x3f,0xc0000000,0xff0,0x7f80,0x3fc00,0x1fe000,0xff0000,0x78,0x3fc00001,0xf800000f,0xc000007e,0x3f0,0x7c0,
      0x1e1fc0,0x1f000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x30000000,0x0,0x0,0x3c0,0x1e000,0x0,0x0,0x1f00000,0x0,0x3c0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x7c,0x0,0x0,0x0,0x0,0x3e00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0xe0000000,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x3c,0x1,0xe00001e0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf0000000,0x0,0xf000,0x0,0x0,0x0,0x0,0x780,0x0,0x3c000000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x78000000,0x1e,0xf0,0x780,0x0,0x0,0x0,0x0,0x3c000000,0x78000078,0xf000000,0x18,0xc0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x180000,0x0,0x0,0x3c,0x3c0f,0x80000000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c00000,0xe1c00,0x0,0x1800000,0x0,0x0,0x3ff,0xf80000f0,0xfffe,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0xc,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0xc,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x30,0x0,0x0,0x0,0x0,0x780,0x1e0000,0x1e000,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x30000000,
      0x0,0x0,0x3c0,0x1e000,0x0,0x0,0x1f00000,0x0,0x3c0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7c,0x0,0x0,0x0,0x0,0x1f80000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3,0xf0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c,0x1,0xe00001e0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0xe0000000,0x0,0xf000,0x0,0x0,0x0,0x0,0x780,0x0,0x3c000000,0x0,0x0,0x0,0x0,0x0,0x0,0xf8000000,
      0x1f,0xf0,0xf80,0x0,0x0,0x0,0x0,0x78000000,0xf8000078,0x1e000000,0x8,0x40,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x180000,0x0,0x0,0x3c,0x3fff,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x3c00000,0xe1c00,0x0,0x1c00000,0x0,0x0,0x1,0xc00001e0,0x70,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xe,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xe,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf80,0x1e0000,0x3e000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x30000000,0x0,0x0,0x1e0,0x3c000,0x0,0x0,0x1f00000,
      0x0,0x780,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7c,0x0,0x0,0x0,0x0,0xfe0100,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0xf8000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3f,0xf0000000,0xf0007fe0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0xe0000000,
      0x0,0xf000,0x0,0x0,0x0,0x0,0x780,0x0,0x3c000000,0x0,0x0,0x0,0x0,0x0,0x0,0xf0000000,0x1f,0x800000f0,0x1f80,0x0,0x0,0x0,0x0,
      0x78000000,0xf0000070,0x1c000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x180000,0x0,0x0,0x3c,0x3ffe,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c00000,0xe1c00,0x0,0xe00000,
      0x0,0x0,0x1,0xc00003ff,0xe0000070,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0xf00,0x1e0000,0x3c000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x30000000,0x0,0x0,0x1e0,0x7c000,0x0,0x0,0x1e00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x78,0x0,0x0,0x0,0x0,0x7fff80,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x78000000,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3f,0xf0000000,0x7fe0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x4003,0xe0000000,0x0,0x1f000,0x0,0x0,
      0x0,0x0,0x780,0x0,0x3c000000,0x0,0x0,0x0,0x0,0x0,0x1,0xf0000000,0xf,0xfc0000f0,0x3ff00,0x0,0x0,0x0,0x0,0x70000001,0xf00000e0,
      0x1c000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x180000,
      0x0,0x0,0x3c,0xff8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c00000,0xe1c00,0x0,0xe00000,0x0,0x0,0x1,0xc00003ff,
      0xe0000070,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1f00,0x1e0000,
      0x7c000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x30000000,0x0,0x0,0xf0,0x78000,0x0,0x0,0x3e00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf8,0x0,
      0x0,0x0,0x0,0x1fff80,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x20000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3f,
      0xf0000000,0x7fe0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x780f,0xc0000000,0x0,0x3e000,0x0,0x0,0x0,0x0,0x780,0x0,0x3c000000,0x0,
      0x0,0x0,0x0,0x0,0x3,0xe0000000,0xf,0xfc0000f0,0x3ff00,0x0,0x0,0x0,0x0,0xf0000103,0xe0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
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      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3c00000,0x0,0x0,0x21e00000,0x0,0x0,0x1,0xc00003ff,0xe0000070,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x10f,
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      0xf8,0xf8000,0x0,0x0,0x3c00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf0,0x0,0x0,0x0,0x0,0x1fe00,0x0,0x0,0x0,0x0,
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      0x0,0x0,0x7fff,0xc0000000,0x0,0x3ffe000,0x0,0x0,0x0,0x0,0x780,0x0,0x3c000000,0x0,0x0,0x0,0x0,0x0,0x7f,0xe0000000,0x7,0xfc0000f0,
      0x3fe00,0x0,0x0,0x0,0x0,0x600001ff,0xe0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
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      0x3fe00000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1ff,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
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      0x0,0x0,0x0,0x0,0x7f,0xc0000000,0x0,0xfc0000f0,0x3f000,0x0,0x0,0x0,0x0,0x1ff,0xc0000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
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      0x0,0x780,0x0,0x3c000000,0x0,0x0,0x0,0x0,0x0,0x7f,0x80000000,0x0,0xf0,0x0,0x0,0x0,0x0,0x0,0x1ff,0x80000000,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
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      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1fffffe0,0x0,0x0,0x0,0x0,0x0,0x0,0x7f8,0x0,0x0,0x3fe0000,
      0x0,0x0,0x0,0x0,0x780,0x0,0x3c000000,0x0,0x0,0x0,0x0,0x0,0x7e,0x0,0x0,0xf0,0x0,0x0,0x0,0x0,0x0,0xfe,0x0,0x0,0x0,0x0,0x0,0x0,
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      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7e000,0x1e0000,0x1f80000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
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      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
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      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xf0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
      0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0 };

    // Definition of a 40x38 'danger' color logo.
    const unsigned char logo40x38[4576] = {
      177,200,200,200,3,123,123,0,36,200,200,200,1,123,123,0,2,255,255,0,1,189,189,189,1,0,0,0,34,200,200,200,
      1,123,123,0,4,255,255,0,1,189,189,189,1,0,0,0,1,123,123,123,32,200,200,200,1,123,123,0,5,255,255,0,1,0,0,
      0,2,123,123,123,30,200,200,200,1,123,123,0,6,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,29,200,200,200,
      1,123,123,0,7,255,255,0,1,0,0,0,2,123,123,123,28,200,200,200,1,123,123,0,8,255,255,0,1,189,189,189,1,0,0,0,
      2,123,123,123,27,200,200,200,1,123,123,0,9,255,255,0,1,0,0,0,2,123,123,123,26,200,200,200,1,123,123,0,10,255,
      255,0,1,189,189,189,1,0,0,0,2,123,123,123,25,200,200,200,1,123,123,0,3,255,255,0,1,189,189,189,3,0,0,0,1,189,
      189,189,3,255,255,0,1,0,0,0,2,123,123,123,24,200,200,200,1,123,123,0,4,255,255,0,5,0,0,0,3,255,255,0,1,189,
      189,189,1,0,0,0,2,123,123,123,23,200,200,200,1,123,123,0,4,255,255,0,5,0,0,0,4,255,255,0,1,0,0,0,2,123,123,123,
      22,200,200,200,1,123,123,0,5,255,255,0,5,0,0,0,4,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,21,200,200,200,
      1,123,123,0,5,255,255,0,5,0,0,0,5,255,255,0,1,0,0,0,2,123,123,123,20,200,200,200,1,123,123,0,6,255,255,0,5,0,0,
      0,5,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,19,200,200,200,1,123,123,0,6,255,255,0,1,123,123,0,3,0,0,0,1,
      123,123,0,6,255,255,0,1,0,0,0,2,123,123,123,18,200,200,200,1,123,123,0,7,255,255,0,1,189,189,189,3,0,0,0,1,189,
      189,189,6,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,17,200,200,200,1,123,123,0,8,255,255,0,3,0,0,0,8,255,255,
      0,1,0,0,0,2,123,123,123,16,200,200,200,1,123,123,0,9,255,255,0,1,123,123,0,1,0,0,0,1,123,123,0,8,255,255,0,1,189,
      189,189,1,0,0,0,2,123,123,123,15,200,200,200,1,123,123,0,9,255,255,0,1,189,189,189,1,0,0,0,1,189,189,189,9,255,255,
      0,1,0,0,0,2,123,123,123,14,200,200,200,1,123,123,0,11,255,255,0,1,0,0,0,10,255,255,0,1,189,189,189,1,0,0,0,2,123,
      123,123,13,200,200,200,1,123,123,0,23,255,255,0,1,0,0,0,2,123,123,123,12,200,200,200,1,123,123,0,11,255,255,0,1,189,
      189,189,2,0,0,0,1,189,189,189,9,255,255,0,1,189,189,189,1,0,0,0,2,123,123,123,11,200,200,200,1,123,123,0,11,255,255,
      0,4,0,0,0,10,255,255,0,1,0,0,0,2,123,123,123,10,200,200,200,1,123,123,0,12,255,255,0,4,0,0,0,10,255,255,0,1,189,189,
      189,1,0,0,0,2,123,123,123,9,200,200,200,1,123,123,0,12,255,255,0,1,189,189,189,2,0,0,0,1,189,189,189,11,255,255,0,1,
      0,0,0,2,123,123,123,9,200,200,200,1,123,123,0,27,255,255,0,1,0,0,0,3,123,123,123,8,200,200,200,1,123,123,0,26,255,
      255,0,1,189,189,189,1,0,0,0,3,123,123,123,9,200,200,200,1,123,123,0,24,255,255,0,1,189,189,189,1,0,0,0,4,123,123,
      123,10,200,200,200,1,123,123,0,24,0,0,0,5,123,123,123,12,200,200,200,27,123,123,123,14,200,200,200,25,123,123,123,86,
      200,200,200,91,49,124,118,124,71,32,124,95,49,56,114,52,82,121,0};

    //! Set/get output stream for CImg library messages.
    inline std::FILE* output(std::FILE *file) {
      static std::FILE *res = stderr;
      if (file) res = file;
      return res;
    }

    //! Display a warning message.
    /**
       \param format is a C-string describing the format of the message, as in <tt>std::printf()</tt>.
    **/
    inline void warn(const char *const format, ...) {
      if (cimg::exception_mode()>=1) {
        char message[16384] = { 0 };
        std::va_list ap;
        va_start(ap,format);
        cimg_vsnprintf(message,sizeof(message),format,ap);
        va_end(ap);
#ifdef cimg_strict_warnings
        throw CImgWarningException(message);
#else
        std::fprintf(cimg::output(),"\n%s[CImg] *** Warning ***%s%s",cimg::t_red,cimg::t_normal,message);
#endif
      }
    }

    // Execute an external system command.
    /**
       \note This function is similar to <tt>std::system()</tt>
       and is here because using the <tt>std::</tt> version on
       Windows may open undesired consoles.
    **/
    inline int system(const char *const command, const char *const module_name=0) {
#if cimg_OS==2
      PROCESS_INFORMATION pi;
      STARTUPINFO si;
      std::memset(&pi,0,sizeof(PROCESS_INFORMATION));
      std::memset(&si,0,sizeof(STARTUPINFO));
      GetStartupInfo(&si);
      si.cb = sizeof(si);
      si.wShowWindow = SW_HIDE;
      si.dwFlags |= SW_HIDE;
      const BOOL res = CreateProcess((LPCTSTR)module_name,(LPTSTR)command,0,0,FALSE,0,0,0,&si,&pi);
      if (res) {
        WaitForSingleObject(pi.hProcess, INFINITE);
        CloseHandle(pi.hThread);
        CloseHandle(pi.hProcess);
        return 0;
      } else
#endif
        return std::system(command);
      return module_name?0:1;
    }

    //! Return a reference to a temporary variable of type T.
    template<typename T>
    inline T& temporary(const T&) {
      static T temp;
      return temp;
    }

    //! Exchange values of variables \p a and \p b.
    template<typename T>
    inline void swap(T& a, T& b) { T t = a; a = b; b = t; }

    //! Exchange values of variables (\p a1,\p a2) and (\p b1,\p b2).
    template<typename T1, typename T2>
    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2) {
      cimg::swap(a1,b1); cimg::swap(a2,b2);
    }

    //! Exchange values of variables (\p a1,\p a2,\p a3) and (\p b1,\p b2,\p b3).
    template<typename T1, typename T2, typename T3>
    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3) {
      cimg::swap(a1,b1,a2,b2); cimg::swap(a3,b3);
    }

    //! Exchange values of variables (\p a1,\p a2,...,\p a4) and (\p b1,\p b2,...,\p b4).
    template<typename T1, typename T2, typename T3, typename T4>
    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4) {
      cimg::swap(a1,b1,a2,b2,a3,b3); cimg::swap(a4,b4);
    }

    //! Exchange values of variables (\p a1,\p a2,...,\p a5) and (\p b1,\p b2,...,\p b5).
    template<typename T1, typename T2, typename T3, typename T4, typename T5>
    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4, T5& a5, T5& b5) {
      cimg::swap(a1,b1,a2,b2,a3,b3,a4,b4); cimg::swap(a5,b5);
    }

    //! Exchange values of variables (\p a1,\p a2,...,\p a6) and (\p b1,\p b2,...,\p b6).
    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4, T5& a5, T5& b5, T6& a6, T6& b6) {
      cimg::swap(a1,b1,a2,b2,a3,b3,a4,b4,a5,b5); cimg::swap(a6,b6);
    }

    //! Exchange values of variables (\p a1,\p a2,...,\p a7) and (\p b1,\p b2,...,\p b7).
    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4, T5& a5, T5& b5, T6& a6, T6& b6,
                     T7& a7, T7& b7) {
      cimg::swap(a1,b1,a2,b2,a3,b3,a4,b4,a5,b5,a6,b6); cimg::swap(a7,b7);
    }

    //! Exchange values of variables (\p a1,\p a2,...,\p a8) and (\p b1,\p b2,...,\p b8).
    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
    inline void swap(T1& a1, T1& b1, T2& a2, T2& b2, T3& a3, T3& b3, T4& a4, T4& b4, T5& a5, T5& b5, T6& a6, T6& b6,
                     T7& a7, T7& b7, T8& a8, T8& b8) {
      cimg::swap(a1,b1,a2,b2,a3,b3,a4,b4,a5,b5,a6,b6,a7,b7); cimg::swap(a8,b8);
    }

    //! Return the current endianness of the CPU.
    /**
       \return \c false for "Little Endian", \c true for "Big Endian".
    **/
    inline bool endianness() {
      const int x = 1;
      return ((unsigned char*)&x)[0]?false:true;
    }

    //! Invert endianness of a memory buffer.
    template<typename T>
    inline void invert_endianness(T* const buffer, const unsigned int size) {
      if (size) switch (sizeof(T)) {
      case 1 : break;
      case 2 : { for (unsigned short *ptr = (unsigned short*)buffer+size; ptr>(unsigned short*)buffer; ) {
        const unsigned short val = *(--ptr);
        *ptr = (unsigned short)((val>>8)|((val<<8)));
      }
      } break;
      case 4 : { for (unsigned int *ptr = (unsigned int*)buffer+size; ptr>(unsigned int*)buffer; ) {
        const unsigned int val = *(--ptr);
        *ptr = (val>>24)|((val>>8)&0xff00)|((val<<8)&0xff0000)|(val<<24);
      }
      } break;
      default : { for (T* ptr = buffer+size; ptr>buffer; ) {
        unsigned char *pb = (unsigned char*)(--ptr), *pe = pb + sizeof(T);
        for (int i = 0; i<(int)sizeof(T)/2; ++i) swap(*(pb++),*(--pe));
      }
      }
      }
    }

    //! Invert endianness of a single variable.
    template<typename T>
    inline T& invert_endianness(T& a) {
      invert_endianness(&a,1);
      return a;
    }

    // Conversion function to gain more precision in storage of unsigned ints as floats.
    inline unsigned int float2uint(const float f) {
      if (f>=0) return (unsigned int)f;
      static unsigned int u;
      std::memcpy(&u,&f,sizeof(float));  // use memcpy instead of assignment to avoid wrong optimizations with g++.
      return ((u)<<1)>>1; // set sign bit to 0.
    }

    inline float uint2float(const unsigned int u) {
      if (u<1000000U) return (float)u;
      static float f;
      const unsigned int v = u|(1U<<(8*sizeof(unsigned int)-1)); // set sign bit to 1.
      std::memcpy(&f,&v,sizeof(float)); // use memcpy instead of simple assignment to avoir wrong optimizations with g++.
      return f;
    }

    //! Get the value of a system timer with a millisecond precision.
    inline unsigned long time() {
#if cimg_OS==1
      struct timeval st_time;
      gettimeofday(&st_time,0);
      return (unsigned long)(st_time.tv_usec/1000 + st_time.tv_sec*1000);
#elif cimg_OS==2
      static SYSTEMTIME st_time;
      GetSystemTime(&st_time);
      return (unsigned long)(st_time.wMilliseconds + 1000*(st_time.wSecond + 60*(st_time.wMinute + 60*st_time.wHour)));
#else
      return 0;
#endif
    }

    // Implement a tic/toc mechanism to display elapsed time of algorithms.
    inline unsigned long tictoc(const bool is_tic) {
      static unsigned long t0 = 0;
      const unsigned long t = cimg::time();
      if (is_tic) return (t0 = t);
      const unsigned long dt = t>=t0?(t - t0):cimg::type<unsigned long>::max();
      const unsigned int
        edays = (unsigned int)(dt/86400000.0),
        ehours = (unsigned int)((dt - edays*86400000.0)/3600000.0),
        emin = (unsigned int)((dt - edays*86400000.0 - ehours*3600000.0)/60000.0),
        esec = (unsigned int)((dt - edays*86400000.0 - ehours*3600000.0 - emin*60000.0)/1000.0),
        ems = (unsigned int)(dt - edays*86400000.0 - ehours*3600000.0 - emin*60000.0 - esec*1000.0);
      if (!edays && !ehours && !emin && !esec)
        std::fprintf(cimg::output(),"%s[CImg] Elapsed time : %u ms%s\n",cimg::t_red,ems,cimg::t_normal);
      else {
        if (!edays && !ehours && !emin)
          std::fprintf(cimg::output(),"%s[CImg] Elapsed time : %u sec %u ms%s\n",cimg::t_red,esec,ems,cimg::t_normal);
        else {
          if (!edays && !ehours)
            std::fprintf(cimg::output(),"%s[CImg] Elapsed time : %u min %u sec %u ms%s\n",cimg::t_red,emin,esec,ems,cimg::t_normal);
          else{
            if (!edays)
              std::fprintf(cimg::output(),"%s[CImg] Elapsed time : %u hours %u min %u sec %u ms%s\n",cimg::t_red,ehours,emin,esec,ems,cimg::t_normal);
            else{
              std::fprintf(cimg::output(),"%s[CImg] Elapsed time : %u days %u hours %u min %u sec %u ms%s\n",cimg::t_red,edays,ehours,emin,esec,ems,cimg::t_normal);
            }
          }
        }
      }
      return t;
    }

    inline unsigned long tic() {
      return cimg::tictoc(true);
    }

    inline unsigned long toc() {
      return cimg::tictoc(false);
    }

    //! Sleep for a certain numbers of milliseconds.
    /**
       This function frees the CPU ressources during the sleeping time.
       It may be used to temporize your program properly, without wasting CPU time.
    **/
    inline void sleep(const unsigned int milliseconds) {
#if cimg_OS==1
      struct timespec tv;
      tv.tv_sec = milliseconds/1000;
      tv.tv_nsec = (milliseconds%1000)*1000000;
      nanosleep(&tv,0);
#elif cimg_OS==2
      Sleep(milliseconds);
#endif
    }

    inline unsigned int _sleep(const unsigned int milliseconds, unsigned long& timer) {
      if (!timer) timer = cimg::time();
      const unsigned long current_time = cimg::time();
      if (current_time>=timer+milliseconds) { timer = current_time; return 0; }
      const unsigned long time_diff = timer + milliseconds - current_time;
      timer = current_time + time_diff;
      cimg::sleep(time_diff);
      return (unsigned int)time_diff;
    }

    //! Wait for a certain number of milliseconds since the last call.
    /**
       This function is equivalent to sleep() but the waiting time is computed with regard to the last call
       of wait(). It may be used to temporize your program properly.
    **/
    inline unsigned int wait(const unsigned int milliseconds) {
      static unsigned long timer = 0;
      if (!timer) timer = cimg::time();
      return _sleep(milliseconds,timer);
    }

    // Use a specific srand initialization to avoid multi-threads to have to the
    // same series of random numbers (executed only once for a single program).
    inline void srand() {
      static bool first_time = true;
      if (first_time) {
        std::srand(cimg::time());
        unsigned char *const rand_ptr = new unsigned char[sizeof(unsigned int)+std::rand()%2048];
        std::srand((unsigned int)std::rand() + *(unsigned int*)(void*)rand_ptr);
        delete[] rand_ptr;
        first_time = false;
      }
    }

    //! Return a left bitwise-rotated number.
    template<typename T>
    inline T rol(const T a, const unsigned int n=1) {
      return n?(T)((a<<n)|(a>>((sizeof(T)<<3)-n))):a;
    }

    inline float rol(const float a, const unsigned int n=1) {
      return (float)rol((int)a,n);
    }

    inline double rol(const double a, const unsigned int n=1) {
      return (double)rol((long)a,n);
    }

    //! Return a right bitwise-rotated number.
    template<typename T>
    inline T ror(const T a, const unsigned int n=1) {
      return n?(T)((a>>n)|(a<<((sizeof(T)<<3)-n))):a;
    }

    inline float ror(const float a, const unsigned int n=1) {
      return (float)ror((int)a,n);
    }

    inline double ror(const double a, const unsigned int n=1) {
      return (double)ror((long)a,n);
    }

    //! Return the absolute value of a number.
    /**
       \note This function is different from <tt>std::abs()</tt> or <tt>std::fabs()</tt>
       because it is able to consider a variable of any type, without cast needed.
    **/
    template<typename T>
    inline T abs(const T a) {
      return a>=0?a:-a;
    }
    inline bool abs(const bool a) {
      return a;
    }
    inline unsigned char abs(const unsigned char a) {
      return a;
    }
    inline unsigned short abs(const unsigned short a) {
      return a;
    }
    inline unsigned int abs(const unsigned int a) {
      return a;
    }
    inline unsigned long abs(const unsigned long a) {
      return a;
    }
    inline double abs(const double a) {
      return std::fabs(a);
    }
    inline float abs(const float a) {
      return (float)std::fabs((double)a);
    }
    inline int abs(const int a) {
      return std::abs(a);
    }

    //! Return the square of a number.
    template<typename T>
    inline T sqr(const T val) {
      return val*val;
    }

    //! Return 1 + log_10(x).
    inline int xln(const int x) {
      return x>0?(int)(1+std::log10((double)x)):1;
    }

    //! Return the minimum value between two numbers.
    template<typename t1, typename t2>
    inline typename cimg::superset<t1,t2>::type min(const t1& a, const t2& b) {
      typedef typename cimg::superset<t1,t2>::type t1t2;
      return (t1t2)(a<=b?a:b);
    }

    //! Return the minimum value between three numbers.
    template<typename t1, typename t2, typename t3>
    inline typename cimg::superset2<t1,t2,t3>::type min(const t1& a, const t2& b, const t3& c) {
      typedef typename cimg::superset2<t1,t2,t3>::type t1t2t3;
      return (t1t2t3)cimg::min(cimg::min(a,b),c);
    }

    //! Return the minimum value between four numbers.
    template<typename t1, typename t2, typename t3, typename t4>
    inline typename cimg::superset3<t1,t2,t3,t4>::type min(const t1& a, const t2& b, const t3& c, const t4& d) {
      typedef typename cimg::superset3<t1,t2,t3,t4>::type t1t2t3t4;
      return (t1t2t3t4)cimg::min(cimg::min(a,b,c),d);
    }

    //! Return the maximum value between two numbers.
    template<typename t1, typename t2>
    inline typename cimg::superset<t1,t2>::type max(const t1& a, const t2& b) {
      typedef typename cimg::superset<t1,t2>::type t1t2;
      return (t1t2)(a>=b?a:b);
    }

    //! Return the maximum value between three numbers.
    template<typename t1, typename t2, typename t3>
    inline typename cimg::superset2<t1,t2,t3>::type max(const t1& a, const t2& b, const t3& c) {
      typedef typename cimg::superset2<t1,t2,t3>::type t1t2t3;
      return (t1t2t3)cimg::max(cimg::max(a,b),c);
    }

    //! Return the maximum value between four numbers.
    template<typename t1, typename t2, typename t3, typename t4>
    inline typename cimg::superset3<t1,t2,t3,t4>::type max(const t1& a, const t2& b, const t3& c, const t4& d) {
      typedef typename cimg::superset3<t1,t2,t3,t4>::type t1t2t3t4;
      return (t1t2t3t4)cimg::max(cimg::max(a,b,c),d);
    }

    //! Return the sign of a number.
    template<typename T>
    inline T sign(const T x) {
      return (x<0)?(T)(-1):(x==0?(T)0:(T)1);
    }

    //! Return the nearest power of 2 higher than a given number.
    template<typename T>
    inline unsigned int nearest_pow2(const T x) {
      unsigned int i = 1;
      while (x>i) i<<=1;
      return i;
    }

    //! Return the sinc() of a given number.
    inline double sinc(const double x) {
      return x?std::sin(x)/x:1;
    }

    //! Return the modulo of a number.
    /**
       \note This modulo function accepts negative and floating-points modulo numbers, as well as
       variable of any type.
    **/
    template<typename T>
    inline T mod(const T& x, const T& m) {
      const double dx = (double)x, dm = (double)m;
      if (x<0) { return (T)(dm+dx+dm*std::floor(-dx/dm)); }
      return (T)(dx-dm*std::floor(dx/dm));
    }
    inline int mod(const bool x, const bool m) {
      return m?(x?1:0):0;
    }
    inline int mod(const char x, const char m) {
      return x>=0?x%m:(x%m?m+x%m:0);
    }
    inline int mod(const short x, const short m) {
      return x>=0?x%m:(x%m?m+x%m:0);
    }
    inline int mod(const int x, const int m) {
      return x>=0?x%m:(x%m?m+x%m:0);
    }
    inline int mod(const long x, const long m) {
      return x>=0?x%m:(x%m?m+x%m:0);
    }
    inline int mod(const unsigned char x, const unsigned char m) {
      return x%m;
    }
    inline int mod(const unsigned short x, const unsigned short m) {
      return x%m;
    }
    inline int mod(const unsigned int x, const unsigned int m) {
      return x%m;
    }
    inline int mod(const unsigned long x, const unsigned long m) {
      return x%m;
    }

    //! Return the minmod of two numbers.
    /**
       <i>minmod(\p a,\p b)</i> is defined to be :
       - <i>minmod(\p a,\p b) = min(\p a,\p b)</i>, if \p a and \p b have the same sign.
       - <i>minmod(\p a,\p b) = 0</i>, if \p a and \p b have different signs.
    **/
    template<typename T>
    inline T minmod(const T a, const T b) {
      return a*b<=0?0:(a>0?(a<b?a:b):(a<b?b:a));
    }

    //! Return a random variable between [0,1] with respect to an uniform distribution.
    inline double rand() {
      static bool first_time = true;
      if (first_time) { cimg::srand(); first_time = false; }
      return (double)std::rand()/RAND_MAX;
    }

    //! Return a random variable between [-1,1] with respect to an uniform distribution.
    inline double crand() {
      return 1-2*cimg::rand();
    }

    //! Return a random variable following a gaussian distribution and a standard deviation of 1.
    inline double grand() {
      double x1, w;
      do {
        const double x2 = 2*cimg::rand() - 1.0;
        x1 = 2*cimg::rand()-1.0;
        w = x1*x1 + x2*x2;
      } while (w<=0 || w>=1.0);
      return x1*std::sqrt((-2*std::log(w))/w);
    }

    //! Return a random variable following a Poisson distribution of parameter z.
    inline unsigned int prand(const double z) {
      if (z<=1.0e-10) return 0;
      if (z>100) return (unsigned int)((std::sqrt(z) * cimg::grand()) + z);
      unsigned int k = 0;
      const double y = std::exp(-z);
      for (double s = 1.0; s>=y; ++k) s*=cimg::rand();
      return k-1;
    }

    //! Return a rounded number.
    /**
       \param x is the number to be rounded.
       \param y is the rounding precision.
       \param rounding_type defines the type of rounding (0=nearest, -1=backward, 1=forward).
       \return the rounded value, with the same type as parameter x.
    **/
    template<typename T>
    inline T round(const T x, const double y=1, const int rounding_type=0) {
      if (y<=0) return x;
      const double delta = cimg::mod((double)x,y);
      if (delta==0.0) return x;
      if (delta==0.5*y) return (T)(x>=0?x+delta:x-delta);
      const double
        backward = x - delta,
        forward = backward + y;
      return (T)(rounding_type<0?backward:(rounding_type>0?forward:(2*delta<y?backward:forward)));
    }

    inline double _pythagore(double a, double b) {
      const double absa = cimg::abs(a), absb = cimg::abs(b);
      if (absa>absb) { const double tmp = absb/absa; return absa*std::sqrt(1.0+tmp*tmp); }
      else { const double tmp = absa/absb; return (absb==0?0:absb*std::sqrt(1.0+tmp*tmp)); }
    }

    //! Remove the 'case' of an ASCII character.
    inline char uncase(const char x) {
      return (char)((x<'A'||x>'Z')?x:x-'A'+'a');
    }

    //! Remove the 'case' of a C string.
    /**
       Acts in-place.
    **/
    inline void uncase(char *const string) {
      if (string) for (char *ptr = string; *ptr; ++ptr) *ptr = uncase(*ptr);
    }

    //! Read a double number from a C-string.
    /**
       \note This function is quite similar to <tt>std::atof()</tt>,
       but that it allows the retrieval of fractions as in "1/2".
    **/
    inline double atof(const char *const str) {
      double x = 0, y = 1;
      if (!str) return 0; else { std::sscanf(str,"%lf/%lf",&x,&y); return x/y; }
    }

    //! Compare the first \p n characters of two C-strings, ignoring the case.
    /**
       \note This function is defined since it is not provided by all compilers
       (not an ANSI function).
    **/
    inline int strncasecmp(const char *const s1, const char *const s2, const int l) {
      if (!l) return 0;
      if (!s1) return s2?-1:0;
      const char *ns1 = s1, *ns2 = s2;
      int k, diff = 0; for (k = 0; k<l && !(diff = uncase(*ns1)-uncase(*ns2)); ++k) { ++ns1; ++ns2; }
      return k!=l?diff:0;
    }

    //! Compare two C-strings, ignoring the case.
    /**
       \note This function is defined since it is not provided by all compilers
       (not an ANSI function).
    **/
    inline int strcasecmp(const char *const s1, const char *const s2) {
      if (!s1) return s2?-1:0;
      const unsigned int l1 = std::strlen(s1), l2 = std::strlen(s2);
      return cimg::strncasecmp(s1,s2,1+(l1<l2?l1:l2));
    }

    //! Remove useless delimiters on the borders of a C-string
    inline bool strpare(char *const s, const char delimiter=' ', const bool symmetric=false, const bool is_iterative=false) {
      if (!s) return false;
      const int l = (int)std::strlen(s);
      int p, q;
      if (symmetric) for (p = 0, q = l-1; p<q && s[p]==delimiter && s[q]==delimiter; ) { --q; ++p; if (!is_iterative) break; }
      else {
        for (p = 0; p<l && s[p]==delimiter; ) { ++p; if (!is_iterative) break; }
        for (q = l-1; q>p && s[q]==delimiter; ) { --q; if (!is_iterative) break; }
      }
      const int n = q - p + 1;
      if (n!=l) { std::memmove(s,s+p,n); s[n] = 0; return true; }
      return false;
    }

    //! Replace explicit escape sequences '\x' in C-strings.
    inline void strescape(char *const s) {
#define cimg_strescape(ci,co) case ci: *nd = co; ++ns; break;
      static unsigned int val = 0;
      for (char *ns = s, *nd = s; *ns || (bool)(*nd=0); ++nd) if (*ns=='\\') switch (*(++ns)) {
            cimg_strescape('n','\n');
            cimg_strescape('t','\t');
            cimg_strescape('v','\v');
            cimg_strescape('b','\b');
            cimg_strescape('r','\r');
            cimg_strescape('f','\f');
            cimg_strescape('a','\a');
            cimg_strescape('\\','\\');
            cimg_strescape('\?','\?');
            cimg_strescape('\'','\'');
            cimg_strescape('\"','\"');
          case 0 : *nd = 0; break;
          case '0' : case '1' : case '2' : case '3' : case '4' : case '5' : case '6' : case '7' :
            std::sscanf(ns,"%o",&val); while (*ns>='0' && *ns<='7') ++ns;
            *nd = val; break;
          case 'x':
            std::sscanf(++ns,"%x",&val); while ((*ns>='0' && *ns<='7') || (*ns>='a' && *ns<='f') || (*ns>='A' && *ns<='F')) ++ns;
            *nd = val; break;
          default : *nd = *(ns++);
          } else *nd = *(ns++);
    }

    // Return a temporary string describing the size of a buffer.
    inline const char *strbuffersize(const unsigned long size) {
      static char res[256] = { 0 };
      if (size<1024LU) cimg_snprintf(res,sizeof(res),"%lu byte%s",size,size>1?"s":"");
      else if (size<1024*1024LU) { const float nsize = size/1024.0f; cimg_snprintf(res,sizeof(res),"%.1f Kb",nsize); }
      else if (size<1024*1024*1024LU) { const float nsize = size/(1024*1024.0f); cimg_snprintf(res,sizeof(res),"%.1f Mb",nsize); }
      else { const float nsize = size/(1024*1024*1024.0f); cimg_snprintf(res,sizeof(res),"%.1f Gb",nsize); }
      return res;
    }

    //! Compute the basename of a filename.
    inline const char* basename(const char *const s)  {
      const char *p = 0;
      for (const char *np = s; np>=s && (p=np); np = std::strchr(np,cimg_file_separator)+1) {}
      return p;
    }

    // Generate a random filename.
    inline const char* filenamerand() {
      static char randomid[9] = { 0,0,0,0,0,0,0,0,0 };
      cimg::srand();
      for (unsigned int k = 0; k<8; ++k) {
        const int v = (int)std::rand()%3;
        randomid[k] = (char)(v==0?('0'+(std::rand()%10)):(v==1?('a'+(std::rand()%26)):('A'+(std::rand()%26))));
      }
      return randomid;
    }

    // Convert filename into a Windows-style filename.
    inline void winformat_string(char *const s) {
      if (s && *s) {
#if cimg_OS==2
        char *const ns = new char[MAX_PATH];
        if (GetShortPathNameA(s,ns,MAX_PATH)) std::strcpy(s,ns);
#endif
      }
    }

    //! Open a file, and check for possible errors.
    inline std::FILE *fopen(const char *const path, const char *const mode) {
      if (!path)
        throw CImgArgumentException("cimg::fopen() : Specified file path is (null).");
      if (!mode)
        throw CImgArgumentException("cimg::fopen() : File '%s', specified mode is (null).",
                                    path);
      std::FILE *res = 0;
      if (*path=='-' && path[1]=='.') {
        res = (*mode=='r')?stdin:stdout;
#if cimg_OS==2
        if (*mode && mode[1]=='b') { // Force stdin/stdout to be in binary mode.
          if (_setmode(_fileno(res),0x8000)==-1) res = 0;
        }
#endif
      } else res = std::fopen(path,mode);
      if (!res)
        throw CImgIOException("cimg::fopen() : Failed to open file '%s' with mode '%s'.",
                              path,mode);
      return res;
    }

    //! Close a file, and check for possible errors.
    inline int fclose(std::FILE *file) {
      if (!file) warn("cimg::fclose() : Specified file is (null).");
      if (!file || file==stdin || file==stdout) return 0;
      const int errn = std::fclose(file);
      if (errn!=0) warn("cimg::fclose() : Error code %d returned during file closing.",
                        errn);
      return errn;
    }

    //! Return or set path to store temporary files.
    inline const char* temporary_path(const char *const user_path=0, const bool reinit_path=false) {
#define _cimg_test_temporary_path(p) \
      if (!path_found) { \
        cimg_snprintf(st_path,1024,"%s",p); \
        cimg_snprintf(tmp,sizeof(tmp),"%s%c%s",st_path,cimg_file_separator,filetmp); \
        if ((file=std::fopen(tmp,"wb"))!=0) { cimg::fclose(file); std::remove(tmp); path_found = true; } \
      }
      static char *st_path = 0;
      if (reinit_path) { delete[] st_path; st_path = 0; }
      if (user_path) {
        if (!st_path) st_path = new char[1024];
        std::memset(st_path,0,1024);
        std::strncpy(st_path,user_path,1023);
      } else if (!st_path) {
        st_path = new char[1024];
        std::memset(st_path,0,1024);
        bool path_found = false;
        char tmp[1024] = { 0 }, filetmp[512] = { 0 };
        std::FILE *file = 0;
        cimg_snprintf(filetmp,sizeof(filetmp),"%s.tmp",cimg::filenamerand());
        char *tmpPath = std::getenv("TMP");
        if (!tmpPath) { tmpPath = std::getenv("TEMP"); winformat_string(tmpPath); }
        if (tmpPath) _cimg_test_temporary_path(tmpPath);
#if cimg_OS==2
        _cimg_test_temporary_path("C:\\WINNT\\Temp");
        _cimg_test_temporary_path("C:\\WINDOWS\\Temp");
        _cimg_test_temporary_path("C:\\Temp");
        _cimg_test_temporary_path("C:");
        _cimg_test_temporary_path("D:\\WINNT\\Temp");
        _cimg_test_temporary_path("D:\\WINDOWS\\Temp");
        _cimg_test_temporary_path("D:\\Temp");
        _cimg_test_temporary_path("D:");
#else
        _cimg_test_temporary_path("/tmp");
        _cimg_test_temporary_path("/var/tmp");
#endif
        if (!path_found) {
          *st_path = 0;
          std::strncpy(tmp,filetmp,sizeof(tmp)-1);
          if ((file=std::fopen(tmp,"wb"))!=0) { cimg::fclose(file); std::remove(tmp); path_found = true; }
        }
        if (!path_found)
          throw CImgIOException("cimg::temporary_path() : Failed to locate path for writing temporary files.\n");
      }
      return st_path;
    }

    // Return or set path to the "Program files/" directory (windows only).
#if cimg_OS==2
    inline const char* programfiles_path(const char *const user_path=0, const bool reinit_path=false) {
      static char *st_path = 0;
      if (reinit_path) { delete[] st_path; st_path = 0; }
      if (user_path) {
        if (!st_path) st_path = new char[1024];
        std::memset(st_path,0,1024);
        std::strncpy(st_path,user_path,1023);
      } else if (!st_path) {
        st_path = new char[MAX_PATH];
        std::memset(st_path,0,MAX_PATH);
        // Note : in the following line, 0x26 = CSIDL_PROGRAM_FILES (not defined on every compiler).
#if !defined(__INTEL_COMPILER)
        if (!SHGetSpecialFolderPathA(0,st_path,0x0026,false)) {
          const char *const pfPath = std::getenv("PROGRAMFILES");
          if (pfPath) std::strncpy(st_path,pfPath,MAX_PATH-1);
          else std::strcpy(st_path,"C:\\PROGRA~1");
        }
#else
        std::strcpy(st_path,"C:\\PROGRA~1");
#endif
      }
      return st_path;
    }
#endif

    //! Return or set path to the ImageMagick's \c convert tool.
    inline const char* imagemagick_path(const char *const user_path=0, const bool reinit_path=false) {
      static char *st_path = 0;
      if (reinit_path) { delete[] st_path; st_path = 0; }
      if (user_path) {
        if (!st_path) st_path = new char[1024];
        std::memset(st_path,0,1024);
        std::strncpy(st_path,user_path,1023);
      } else if (!st_path) {
        st_path = new char[1024];
        std::memset(st_path,0,1024);
        bool path_found = false;
        std::FILE *file = 0;
#if cimg_OS==2
        const char *const pf_path = programfiles_path();
        if (!path_found) {
          std::strcpy(st_path,".\\convert.exe");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\IMAGEM~1.%.2d-\\convert.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\IMAGEM~1.%d-Q\\convert.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\IMAGEM~1.%d\\convert.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\IMAGEM~1.%.2d-\\VISUA~1\\BIN\\convert.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\IMAGEM~1.%d-Q\\VISUA~1\\BIN\\convert.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\IMAGEM~1.%d\\VISUA~1\\BIN\\convert.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\IMAGEM~1.%.2d-\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\IMAGEM~1.%d-Q\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\IMAGEM~1.%d\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\IMAGEM~1.%.2d-\\VISUA~1\\BIN\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\IMAGEM~1.%d-Q\\VISUA~1\\BIN\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\IMAGEM~1.%d\\VISUA~1\\BIN\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\IMAGEM~1.%.2d-\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\IMAGEM~1.%d-Q\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\IMAGEM~1.%d\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\IMAGEM~1.%.2d-\\VISUA~1\\BIN\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\IMAGEM~1.%d-Q\\VISUA~1\\BIN\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\IMAGEM~1.%d\\VISUA~1\\BIN\\convert.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"convert.exe");
#else
        if (!path_found) {
          std::strcpy(st_path,"./convert");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"convert");
#endif
        winformat_string(st_path);
      }
      return st_path;
    }

    //! Return path of the GraphicsMagick's \c gm tool.
    inline const char* graphicsmagick_path(const char *const user_path=0, const bool reinit_path=false) {
      static char *st_path = 0;
      if (reinit_path) { delete[] st_path; st_path = 0; }
      if (user_path) {
        if (!st_path) st_path = new char[1024];
        std::memset(st_path,0,1024);
        std::strncpy(st_path,user_path,1023);
      } else if (!st_path) {
        st_path = new char[1024];
        std::memset(st_path,0,1024);
        bool path_found = false;
        std::FILE *file = 0;
#if cimg_OS==2
        const char *const pf_path = programfiles_path();
        if (!path_found) {
          std::strcpy(st_path,".\\gm.exe");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\GRAPHI~1.%.2d-\\gm.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\GRAPHI~1.%d-Q\\gm.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\GRAPHI~1.%d\\gm.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\GRAPHI~1.%.2d-\\VISUA~1\\BIN\\gm.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\GRAPHI~1.%d-Q\\VISUA~1\\BIN\\gm.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\GRAPHI~1.%d\\VISUA~1\\BIN\\gm.exe",pf_path,k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\GRAPHI~1.%.2d-\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\GRAPHI~1.%d-Q\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\GRAPHI~1.%d\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\GRAPHI~1.%.2d-\\VISUA~1\\BIN\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\GRAPHI~1.%d-Q\\VISUA~1\\BIN\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"C:\\GRAPHI~1.%d\\VISUA~1\\BIN\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\GRAPHI~1.%.2d-\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\GRAPHI~1.%d-Q\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\GRAPHI~1.%d\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=10 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\GRAPHI~1.%.2d-\\VISUA~1\\BIN\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 9; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\GRAPHI~1.%d-Q\\VISUA~1\\BIN\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        for (int k = 32; k>=0 && !path_found; --k) {
          cimg_snprintf(st_path,sizeof(st_path),"D:\\GRAPHI~1.%d\\VISUA~1\\BIN\\gm.exe",k);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"gm.exe");
#else
        if (!path_found) {
          std::strcpy(st_path,"./gm");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"gm");
#endif
        winformat_string(st_path);
      }
      return st_path;
    }

    //! Return or set path of the \c XMedcon tool.
    inline const char* medcon_path(const char *const user_path=0, const bool reinit_path=false) {
      static char *st_path = 0;
      if (reinit_path) { delete[] st_path; st_path = 0; }
      if (user_path) {
        if (!st_path) st_path = new char[1024];
        std::memset(st_path,0,1024);
        std::strncpy(st_path,user_path,1023);
      } else if (!st_path) {
        st_path = new char[1024];
        std::memset(st_path,0,1024);
        bool path_found = false;
        std::FILE *file = 0;
#if cimg_OS==2
        const char *const pf_path = programfiles_path();
        if (!path_found) {
          std::strcpy(st_path,".\\medcon.exe");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\XMedCon\\bin\\medcon.bat",pf_path);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) {
          cimg_snprintf(st_path,sizeof(st_path),"%s\\XMedCon\\bin\\medcon.exe",pf_path);
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"medcon.exe");
#else
        if (!path_found) {
          std::strcpy(st_path,"./medcon");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"medcon");
#endif
        winformat_string(st_path);
      }
      return st_path;
    }

    //! Return or set path to the 'ffmpeg' command.
    inline const char *ffmpeg_path(const char *const user_path=0, const bool reinit_path=false) {
      static char *st_path = 0;
      if (reinit_path) { delete[] st_path; st_path = 0; }
      if (user_path) {
        if (!st_path) st_path = new char[1024];
        std::memset(st_path,0,1024);
        std::strncpy(st_path,user_path,1023);
      } else if (!st_path) {
        st_path = new char[1024];
        std::memset(st_path,0,1024);
        bool path_found = false;
        std::FILE *file = 0;
#if cimg_OS==2
        if (!path_found) {
          std::strcpy(st_path,".\\ffmpeg.exe");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"ffmpeg.exe");
#else
        if (!path_found) {
          std::strcpy(st_path,"./ffmpeg");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"ffmpeg");
#endif
        winformat_string(st_path);
      }
      return st_path;
    }

    //! Return or set path to the 'gzip' command.
    inline const char *gzip_path(const char *const user_path=0, const bool reinit_path=false) {
      static char *st_path = 0;
      if (reinit_path) { delete[] st_path; st_path = 0; }
      if (user_path) {
        if (!st_path) st_path = new char[1024];
        std::memset(st_path,0,1024);
        std::strncpy(st_path,user_path,1023);
      } else if (!st_path) {
        st_path = new char[1024];
        std::memset(st_path,0,1024);
        bool path_found = false;
        std::FILE *file = 0;
#if cimg_OS==2
        if (!path_found) {
          std::strcpy(st_path,".\\gzip.exe");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"gzip.exe");
#else
        if (!path_found) {
          std::strcpy(st_path,"./gzip");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"gzip");
#endif
        winformat_string(st_path);
      }
      return st_path;
    }

    //! Return or set path to the 'gunzip' command.
    inline const char *gunzip_path(const char *const user_path=0, const bool reinit_path=false) {
      static char *st_path = 0;
      if (reinit_path) { delete[] st_path; st_path = 0; }
      if (user_path) {
        if (!st_path) st_path = new char[1024];
        std::memset(st_path,0,1024);
        std::strncpy(st_path,user_path,1023);
      } else if (!st_path) {
        st_path = new char[1024];
        std::memset(st_path,0,1024);
        bool path_found = false;
        std::FILE *file = 0;
#if cimg_OS==2
        if (!path_found) {
          std::strcpy(st_path,".\\gunzip.exe");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"gunzip.exe");
#else
        if (!path_found) {
          std::strcpy(st_path,"./gunzip");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"gunzip");
#endif
        winformat_string(st_path);
      }
      return st_path;
    }

    //! Return or set path to the 'dcraw' command.
    inline const char *dcraw_path(const char *const user_path=0, const bool reinit_path=false) {
      static char *st_path = 0;
      if (reinit_path) { delete[] st_path; st_path = 0; }
      if (user_path) {
        if (!st_path) st_path = new char[1024];
        std::memset(st_path,0,1024);
        std::strncpy(st_path,user_path,1023);
      } else if (!st_path) {
        st_path = new char[1024];
        std::memset(st_path,0,1024);
        bool path_found = false;
        std::FILE *file = 0;
#if cimg_OS==2
        if (!path_found) {
          std::strcpy(st_path,".\\dcraw.exe");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"dcraw.exe");
#else
        if (!path_found) {
          std::strcpy(st_path,"./dcraw");
          if ((file=std::fopen(st_path,"r"))!=0) { cimg::fclose(file); path_found = true; }
        }
        if (!path_found) std::strcpy(st_path,"dcraw");
#endif
        winformat_string(st_path);
      }
      return st_path;
    }

    //! Split a filename into two strings 'body' and 'extension'.
    inline const char *split_filename(const char *const filename, char *const body=0) {
      if (!filename) { if (body) *body = 0; return 0; }
      const char *p = 0; for (const char *np = filename; np>=filename && (p=np); np = std::strchr(np,'.')+1) {}
      if (p==filename) {
        if (body) std::strcpy(body,filename);
        return filename + std::strlen(filename);
      }
      const unsigned int l = p - filename - 1;
      if (body) { std::memcpy(body,filename,l); body[l] = 0; }
      return p;
    }

    //! Create a numbered version of a filename.
    inline char* number_filename(const char *const filename, const int number, const unsigned int n, char *const string) {
      if (!filename) { if (string) *string = 0; return 0; }
      char format[1024] = { 0 }, body[1024] = { 0 };
      const char *const ext = cimg::split_filename(filename,body);
      if (n>0) cimg_snprintf(format,sizeof(format),"%s_%%.%ud.%s",body,n,ext);
      else cimg_snprintf(format,sizeof(format),"%s_%%d.%s",body,ext);
      std::sprintf(string,format,number);
      return string;
    }

    //! Try to guess the image format of a filename, using the magic numbers in its header.
    inline const char *file_type(std::FILE *const file, const char *const filename) {
      if (!file && !filename)
        throw CImgArgumentException("cimg::file_type() : Specified filename is (null).");
      static const char
        *const _pnm = "pnm",
        *const _pfm = "pfm",
        *const _bmp = "bmp",
        *const _gif = "gif",
        *const _jpg = "jpg",
        *const _off = "off",
        *const _pan = "pan",
        *const _png = "png",
        *const _tif = "tif",
        *const _inr = "inr",
        *const _dcm = "dcm";
      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      const char *f_type = 0, *head;
      char header[2048] = { 0 }, item[1024] = { 0 };
      const unsigned char *const uheader = (unsigned char*)header;
      int err; char cerr;
      const unsigned int siz = (unsigned int)std::fread(header,2048,1,nfile);   // Read first 2048 bytes.
      if (!file) cimg::fclose(nfile);

      if (!std::strncmp(header,"OFF\n",4)) f_type = _off; // Check for OFF format.
      else if (!std::strncmp(header,"#INRIMAGE",9)) f_type = _inr; // Check for INRIMAGE format.
      else if (!std::strncmp(header,"PANDORE",7)) f_type = _pan; // Check for PANDORE format.
      else if (!std::strncmp(header+128,"DICM",4)) f_type = _dcm; // Check for DICOM format.
      else if (uheader[0]==0xFF && uheader[1]==0xD8 && uheader[2]==0xFF) f_type = _jpg;  // Check for JPEG format.
      else if (header[0]=='B' && header[1]=='M') f_type = _bmp;  // Check for BMP format.
      else if (header[0]=='G' && header[1]=='I' && header[2]=='F' && header[3]=='8' && header[5]=='a' && // Check for GIF format.
               (header[4]=='7' || header[4]=='9')) f_type = _gif;
      else if (uheader[0]==0x89 && uheader[1]==0x50 && uheader[2]==0x4E && uheader[3]==0x47 &&  // Check for PNG format.
               uheader[4]==0x0D && uheader[5]==0x0A && uheader[6]==0x1A && uheader[7]==0x0A) f_type = _png;
      else if ((uheader[0]==0x49 && uheader[1]==0x49) || (uheader[0]==0x4D && uheader[1]==0x4D)) f_type = _tif; // Check for TIFF format.
      else { // Check for PNM or PFM format.
        head = header;
        while (head<header+siz && (err=std::sscanf(head,"%1023[^\n]",item))!=EOF && (*item=='#' || !err))
          head+=1+(err?std::strlen(item):0);
        if (std::sscanf(item," P%d",&err)==1) f_type = _pnm;
        else if (std::sscanf(item," P%c",&cerr)==1 && (cerr=='f' || cerr=='F')) f_type = _pfm;
      }
      return f_type;
    }

    //! Read file data, and check for possible errors.
    template<typename T>
    inline int fread(T *const ptr, const unsigned int nmemb, std::FILE *stream) {
      if (!ptr || nmemb<=0 || !stream)
        throw CImgArgumentException("cimg::fread() : Invalid reading request of %u %s%s from file %p to buffer %p.",
                                    nmemb,cimg::type<T>::string(),nmemb>1?"s":"",stream,ptr);

      const unsigned long wlimitT = 63*1024*1024, wlimit = wlimitT/sizeof(T);
      unsigned int toread = nmemb, alread = 0, ltoread = 0, lalread = 0;
      do {
        ltoread = (toread*sizeof(T))<wlimitT?toread:wlimit;
        lalread = (unsigned int)std::fread((void*)(ptr+alread),sizeof(T),ltoread,stream);
        alread+=lalread;
        toread-=lalread;
      } while (ltoread==lalread && toread>0);
      if (toread>0)
        warn("cimg::fread() : Only %u/%u elements could be read from file.",
             alread,nmemb);
      return alread;
    }

    //! Write data to a file, and check for possible errors.
    template<typename T>
    inline int fwrite(const T *ptr, const unsigned int nmemb, std::FILE *stream) {
      if (!ptr || !stream)
        throw CImgArgumentException("cimg::fwrite() : Invalid writting request of %u %s%s from buffer %p to file %p.",
                                    nmemb,cimg::type<T>::string(),nmemb>1?"s":"",ptr,stream);
      if (nmemb<=0) return 0;
      const unsigned long wlimitT = 63*1024*1024, wlimit = wlimitT/sizeof(T);
      unsigned int towrite = nmemb, alwrite = 0, ltowrite = 0, lalwrite = 0;
      do {
        ltowrite = (towrite*sizeof(T))<wlimitT?towrite:wlimit;
        lalwrite = (unsigned int)std::fwrite((void*)(ptr+alwrite),sizeof(T),ltowrite,stream);
        alwrite+=lalwrite;
        towrite-=lalwrite;
      } while (ltowrite==lalwrite && towrite>0);
      if (towrite>0)
        warn("cimg::fwrite() : Only %u/%u elements could be written in file.",
             alwrite,nmemb);
      return alwrite;
    }

    inline const char* option(const char *const name, const int argc, const char *const *const argv,
                              const char *const defaut, const char *const usage, const bool reset_static) {
      static bool first = true, visu = false;
      if (reset_static) { first = true; return 0; }
      const char *res = 0;
      if (first) {
        first = false;
        visu = cimg::option("-h",argc,argv,(char*)0,(char*)0,false)!=0;
        visu |= cimg::option("-help",argc,argv,(char*)0,(char*)0,false)!=0;
        visu |= cimg::option("--help",argc,argv,(char*)0,(char*)0,false)!=0;
      }
      if (!name && visu) {
        if (usage) {
          std::fprintf(cimg::output(),"\n %s%s%s",cimg::t_red,cimg::basename(argv[0]),cimg::t_normal);
          std::fprintf(cimg::output()," : %s",usage);
          std::fprintf(cimg::output()," (%s, %s)\n\n",__DATE__,__TIME__);
        }
        if (defaut) std::fprintf(cimg::output(),"%s\n",defaut);
      }
      if (name) {
        if (argc>0) {
          int k = 0;
          while (k<argc && std::strcmp(argv[k],name)) ++k;
          res = (k++==argc?defaut:(k==argc?argv[--k]:argv[k]));
        } else res = defaut;
        if (visu && usage) std::fprintf(cimg::output(),"    %s%-16s%s %-24s %s%s%s\n",
                                        cimg::t_bold,name,cimg::t_normal,res?res:"0",cimg::t_green,usage,cimg::t_normal);
      }
      return res;
    }

    inline const char* option(const char *const name, const int argc, const char *const *const argv,
                              const char *const defaut, const char *const usage=0) {
      return option(name,argc,argv,defaut,usage,false);
    }

    inline bool option(const char *const name, const int argc, const char *const *const argv,
                       const bool defaut, const char *const usage=0) {
      const char *const s = cimg::option(name,argc,argv,(char*)0);
      const bool res = s?(cimg::strcasecmp(s,"false") && cimg::strcasecmp(s,"off") && cimg::strcasecmp(s,"0")):defaut;
      cimg::option(name,0,0,res?"true":"false",usage);
      return res;
    }

    inline int option(const char *const name, const int argc, const char *const *const argv,
                      const int defaut, const char *const usage=0) {
      const char *const s = cimg::option(name,argc,argv,(char*)0);
      const int res = s?std::atoi(s):defaut;
      char tmp[256] = { 0 };
      cimg_snprintf(tmp,sizeof(tmp),"%d",res);
      cimg::option(name,0,0,tmp,usage);
      return res;
    }

    inline char option(const char *const name, const int argc, const char *const *const argv,
                       const char defaut, const char *const usage=0) {
      const char *const s = cimg::option(name,argc,argv,(char*)0);
      const char res = s?*s:defaut;
      char tmp[8] = { 0 };
      *tmp = res;
      cimg::option(name,0,0,tmp,usage);
      return res;
    }

    inline float option(const char *const name, const int argc, const char *const *const argv,
                        const float defaut, const char *const usage=0) {
      const char *const s = cimg::option(name,argc,argv,(char*)0);
      const float res = s?(float)cimg::atof(s):defaut;
      char tmp[256] = { 0 };
      cimg_snprintf(tmp,sizeof(tmp),"%g",res);
      cimg::option(name,0,0,tmp,usage);
      return res;
    }

    inline double option(const char *const name, const int argc, const char *const *const argv,
                         const double defaut, const char *const usage=0) {
      const char *const s = cimg::option(name,argc,argv,(char*)0);
      const double res = s?cimg::atof(s):defaut;
      char tmp[256] = { 0 };
      cimg_snprintf(tmp,sizeof(tmp),"%g",res);
      cimg::option(name,0,0,tmp,usage);
      return res;
    }

    inline const char* argument(const unsigned int nb, const int argc, const char *const *const argv, const unsigned int nb_singles=0, ...) {
      for (int k = 1, pos = 0; k<argc;) {
        const char *const item = argv[k];
        bool option = (*item=='-'), single_option = false;
        if (option) {
          va_list ap;
          va_start(ap,nb_singles);
          for (unsigned int i = 0; i<nb_singles; ++i) if (!cimg::strcasecmp(item,va_arg(ap,char*))) { single_option = true; break; }
          va_end(ap);
        }
        if (option) { ++k; if (!single_option) ++k; }
        else { if (pos++==(int)nb) return item; else ++k; }
      }
      return 0;
    }

    //! Print informations about %CImg environement variables.
    /**
       Printing is done on the standard error output.
    **/
    inline void info() {
      char tmp[1024] = { 0 };
      std::fprintf(cimg::output(),"\n %sCImg Library %u.%u.%u%s, compiled %s ( %s ) with the following flags :\n\n",
                   cimg::t_red,cimg_version/100,(cimg_version/10)%10,cimg_version%10,
                   cimg::t_normal,__DATE__,__TIME__);

      std::fprintf(cimg::output(),"  > Operating System :       %s%-13s%s %s('cimg_OS'=%d)%s\n",
                   cimg::t_bold,
                   cimg_OS==1?"Unix":(cimg_OS==2?"Windows":"Unknow"),
                   cimg::t_normal,cimg::t_green,
                   cimg_OS,
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > CPU endianness :         %s%s Endian%s\n",
                   cimg::t_bold,
                   cimg::endianness()?"Big":"Little",
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > Verbosity mode :         %s%-13s%s %s('cimg_verbosity'=%d)%s\n",
                   cimg::t_bold,
                   cimg_verbosity==0?"Quiet":(cimg_verbosity==1?"Console":(cimg_verbosity==2?"Dialog":(cimg_verbosity==3?"Console+Warnings":"Dialog+Warnings"))),
                   cimg::t_normal,cimg::t_green,
                   cimg_verbosity,
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > Stricts warnings :       %s%-13s%s %s('cimg_strict_warnings' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_strict_warnings
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > Using VT100 messages :   %s%-13s%s %s('cimg_use_vt100' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_vt100
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > Display type :           %s%-13s%s %s('cimg_display'=%d)%s\n",
                   cimg::t_bold,
                   cimg_display==0?"No display":cimg_display==1?"X11":cimg_display==2?"Windows GDI":"Unknown",
                   cimg::t_normal,cimg::t_green,
                   cimg_display,
                   cimg::t_normal);

#if cimg_display==1
      std::fprintf(cimg::output(),"  > Using XShm for X11 :     %s%-13s%s %s('cimg_use_xshm' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_xshm
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > Using XRand for X11 :    %s%-13s%s %s('cimg_use_xrandr' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_xrandr
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);
#endif
      std::fprintf(cimg::output(),"  > Using OpenMP :           %s%-13s%s %s('cimg_use_openmp' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_openmp
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);
      std::fprintf(cimg::output(),"  > Using PNG library :      %s%-13s%s %s('cimg_use_png' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_png
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);
      std::fprintf(cimg::output(),"  > Using JPEG library :     %s%-13s%s %s('cimg_use_jpeg' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_jpeg
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > Using TIFF library :     %s%-13s%s %s('cimg_use_tiff' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_tiff
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > Using Magick++ library : %s%-13s%s %s('cimg_use_magick' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_magick
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > Using FFTW3 library :    %s%-13s%s %s('cimg_use_fftw3' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_fftw3
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);

      std::fprintf(cimg::output(),"  > Using LAPACK library :   %s%-13s%s %s('cimg_use_lapack' %s)%s\n",
                   cimg::t_bold,
#ifdef cimg_use_lapack
                   "Yes",cimg::t_normal,cimg::t_green,"defined",
#else
                   "No",cimg::t_normal,cimg::t_green,"undefined",
#endif
                   cimg::t_normal);

      cimg_snprintf(tmp,sizeof(tmp),"\"%.1020s\"",cimg::imagemagick_path());
      std::fprintf(cimg::output(),"  > Path of ImageMagick :    %s%-13s%s\n",
                   cimg::t_bold,
                   tmp,
                   cimg::t_normal);

      cimg_snprintf(tmp,sizeof(tmp),"\"%.1020s\"",cimg::graphicsmagick_path());
      std::fprintf(cimg::output(),"  > Path of GraphicsMagick : %s%-13s%s\n",
                   cimg::t_bold,
                   tmp,
                   cimg::t_normal);

      cimg_snprintf(tmp,sizeof(tmp),"\"%.1020s\"",cimg::medcon_path());
      std::fprintf(cimg::output(),"  > Path of 'medcon' :       %s%-13s%s\n",
                   cimg::t_bold,
                   tmp,
                   cimg::t_normal);

      cimg_snprintf(tmp,sizeof(tmp),"\"%.1020s\"",cimg::temporary_path());
      std::fprintf(cimg::output(),"  > Temporary path :         %s%-13s%s\n",
                   cimg::t_bold,
                   tmp,
                   cimg::t_normal);

      std::fprintf(cimg::output(),"\n");
    }

    // Declare LAPACK function signatures if necessary.
#ifdef cimg_use_lapack
    template<typename T>
    inline void getrf(int &N, T *lapA, int *IPIV, int &INFO) {
      dgetrf_(&N,&N,lapA,&N,IPIV,&INFO);
    }

    inline void getrf(int &N, float *lapA, int *IPIV, int &INFO) {
      sgetrf_(&N,&N,lapA,&N,IPIV,&INFO);
    }

    template<typename T>
    inline void getri(int &N, T *lapA, int *IPIV, T* WORK, int &LWORK, int &INFO) {
      dgetri_(&N,lapA,&N,IPIV,WORK,&LWORK,&INFO);
    }

    inline void getri(int &N, float *lapA, int *IPIV, float* WORK, int &LWORK, int &INFO) {
      sgetri_(&N,lapA,&N,IPIV,WORK,&LWORK,&INFO);
    }

    template<typename T>
    inline void gesvd(char &JOB, int &M, int &N, T *lapA, int &MN,
                      T *lapS, T *lapU, T *lapV, T *WORK, int &LWORK, int &INFO) {
      dgesvd_(&JOB,&JOB,&M,&N,lapA,&MN,lapS,lapU,&M,lapV,&N,WORK,&LWORK,&INFO);
    }

    inline void gesvd(char &JOB, int &M, int &N, float *lapA, int &MN,
                      float *lapS, float *lapU, float *lapV, float *WORK, int &LWORK, int &INFO) {
      sgesvd_(&JOB,&JOB,&M,&N,lapA,&MN,lapS,lapU,&M,lapV,&N,WORK,&LWORK,&INFO);
    }

    template<typename T>
    inline void getrs(char &TRANS, int &N, T *lapA, int *IPIV, T *lapB, int &INFO) {
      int one = 1;
      dgetrs_(&TRANS,&N,&one,lapA,&N,IPIV,lapB,&N,&INFO);
    }

    inline void getrs(char &TRANS, int &N, float *lapA, int *IPIV, float *lapB, int &INFO) {
      int one = 1;
      sgetrs_(&TRANS,&N,&one,lapA,&N,IPIV,lapB,&N,&INFO);
    }

    template<typename T>
    inline void syev(char &JOB, char &UPLO, int &N, T *lapA, T *lapW, T *WORK, int &LWORK, int &INFO) {
      dsyev_(&JOB,&UPLO,&N,lapA,&N,lapW,WORK,&LWORK,&INFO);
    }

    inline void syev(char &JOB, char &UPLO, int &N, float *lapA, float *lapW, float *WORK, int &LWORK, int &INFO) {
      ssyev_(&JOB,&UPLO,&N,lapA,&N,lapW,WORK,&LWORK,&INFO);
    }
#endif

    // End of the 'cimg' namespace
  }

  /*------------------------------------------------
   #
   #
   #   Definition of mathematical operators and
   #   external functions.
   #
   #
   -------------------------------------------------*/

#define _cimg_create_ext_operators(typ) \
  template<typename T> \
  inline CImg<typename cimg::superset<T,typ>::type> operator+(const typ val, const CImg<T>& img) { \
    return img + val; \
  } \
  template<typename T> \
  inline CImg<typename cimg::superset<T,typ>::type> operator-(const typ val, const CImg<T>& img) { \
    typedef typename cimg::superset<T,typ>::type Tt; \
    return CImg<Tt>(img._width,img._height,img._depth,img._spectrum,val)-=img; \
  } \
  template<typename T> \
  inline CImg<typename cimg::superset<T,typ>::type> operator*(const typ val, const CImg<T>& img) { \
    return img*val; \
  } \
  template<typename T> \
  inline CImg<typename cimg::superset<T,typ>::type> operator/(const typ val, const CImg<T>& img) { \
    return val*img.get_invert(); \
  } \
  template<typename T> \
  inline CImg<typename cimg::superset<T,typ>::type> operator&(const typ val, const CImg<T>& img) { \
    return img & val; \
  } \
  template<typename T> \
  inline CImg<typename cimg::superset<T,typ>::type> operator|(const typ val, const CImg<T>& img) { \
    return img | val; \
  } \
  template<typename T> \
  inline CImg<typename cimg::superset<T,typ>::type> operator^(const typ val, const CImg<T>& img) { \
    return img ^ val; \
  } \

  _cimg_create_ext_operators(bool)
  _cimg_create_ext_operators(unsigned char)
  _cimg_create_ext_operators(char)
  _cimg_create_ext_operators(signed char)
  _cimg_create_ext_operators(unsigned short)
  _cimg_create_ext_operators(short)
  _cimg_create_ext_operators(unsigned int)
  _cimg_create_ext_operators(int)
  _cimg_create_ext_operators(unsigned long)
  _cimg_create_ext_operators(long)
  _cimg_create_ext_operators(float)
  _cimg_create_ext_operators(double)

  template<typename T>
  inline CImg<_cimg_Tfloat> operator+(const char *const expression, const CImg<T>& img) {
    return img + expression;
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> operator-(const char *const expression, const CImg<T>& img) {
    return (CImg<_cimg_Tfloat>(img._width,img._height,img._depth,img._spectrum)=expression)-=img;
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> operator*(const char *const expression, const CImg<T>& img) {
    return img*expression;
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> operator/(const char *const expression, const CImg<T>& img) {
    return expression*img.get_invert();
  }

  template<typename T>
  inline CImg<T> operator&(const char *const expression, const CImg<T>& img) {
    return img & expression;
  }

  template<typename T>
  inline CImg<T> operator|(const char *const expression, const CImg<T>& img) {
    return img | expression;
  }

  template<typename T>
  inline CImg<T> operator^(const char *const expression, const CImg<T>& img) {
    return img ^ expression;
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> sqr(const CImg<T>& instance) {
    return instance.get_sqr();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> sqrt(const CImg<T>& instance) {
    return instance.get_sqrt();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> exp(const CImg<T>& instance) {
    return instance.get_exp();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> log(const CImg<T>& instance) {
    return instance.get_log();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> log10(const CImg<T>& instance) {
    return instance.get_log10();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> abs(const CImg<T>& instance) {
    return instance.get_abs();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> sign(const CImg<T>& instance) {
    return instance.get_sign();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> cos(const CImg<T>& instance) {
    return instance.get_cos();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> sin(const CImg<T>& instance) {
    return instance.get_sin();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> sinc(const CImg<T>& instance) {
    return instance.get_sinc();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> tan(const CImg<T>& instance) {
    return instance.get_tan();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> acos(const CImg<T>& instance) {
    return instance.get_acos();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> asin(const CImg<T>& instance) {
    return instance.get_asin();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> atan(const CImg<T>& instance) {
    return instance.get_atan();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> cosh(const CImg<T>& instance) {
    return instance.get_cosh();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> sinh(const CImg<T>& instance) {
    return instance.get_sinh();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> tanh(const CImg<T>& instance) {
    return instance.get_tanh();
  }

  template<typename T>
  inline CImg<T> transpose(const CImg<T>& instance) {
    return instance.get_transpose();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> invert(const CImg<T>& instance) {
    return instance.get_invert();
  }

  template<typename T>
  inline CImg<_cimg_Tfloat> pseudoinvert(const CImg<T>& instance) {
    return instance.get_pseudoinvert();
  }

  /*-------------------------------------------
   #
   #
   #
   # Definition of the CImgDisplay structure
   #
   #
   #
   --------------------------------------------*/

  //! This class represents a window which can display \ref CImg images and handles mouse and keyboard events.
  /**
     Creating a \c CImgDisplay instance opens a window that can be used to display a \c CImg<T> image
     of a \c CImgList<T> image list inside. When a display is created, associated window events
     (such as mouse motion, keyboard and window size changes) are handled and can be easily
     detected by testing specific \c CImgDisplay data fields.
     See \ref cimg_displays for a complete tutorial on using the \c CImgDisplay class.
  **/

  struct CImgDisplay {

    //! Width of the display.
    unsigned int _width;

    //! Height of the display.
    unsigned int _height;

    //! Width of the underlying window.
    volatile unsigned int _window_width;

    //! Height of the underlying window.
    volatile unsigned int _window_height;

    //! X-pos of the display on the screen.
    volatile int _window_x;

    //! Y-pos of the display on the screen.
    volatile int _window_y;

    //! X-coordinate of the mouse pointer on the display.
    volatile int _mouse_x;

    //! Y-coordinate of the mouse pointer on the display.
    volatile int _mouse_y;

    //! Normalization type used for the display.
    unsigned int _normalization;

    //! Display title.
    char *_title;

    //! Button state of the mouse.
    volatile unsigned int _button;

    //! Wheel state of the mouse.
    volatile int _wheel;

    //! Key value if pressed.
    volatile unsigned int _keys[128];
    volatile unsigned int _released_keys[128];

    //! Closed state of the window.
    volatile bool _is_closed;

    //! Resized state of the window.
    volatile bool _is_resized;

    //! Moved state of the window.
    volatile bool _is_moved;

    //! Event state of the window.
    volatile bool _is_event;

    //! Current state of the corresponding key (exists for all referenced keys).
    volatile bool _is_keyESC;
    volatile bool _is_keyF1;
    volatile bool _is_keyF2;
    volatile bool _is_keyF3;
    volatile bool _is_keyF4;
    volatile bool _is_keyF5;
    volatile bool _is_keyF6;
    volatile bool _is_keyF7;
    volatile bool _is_keyF8;
    volatile bool _is_keyF9;
    volatile bool _is_keyF10;
    volatile bool _is_keyF11;
    volatile bool _is_keyF12;
    volatile bool _is_keyPAUSE;
    volatile bool _is_key1;
    volatile bool _is_key2;
    volatile bool _is_key3;
    volatile bool _is_key4;
    volatile bool _is_key5;
    volatile bool _is_key6;
    volatile bool _is_key7;
    volatile bool _is_key8;
    volatile bool _is_key9;
    volatile bool _is_key0;
    volatile bool _is_keyBACKSPACE;
    volatile bool _is_keyINSERT;
    volatile bool _is_keyHOME;
    volatile bool _is_keyPAGEUP;
    volatile bool _is_keyTAB;
    volatile bool _is_keyQ;
    volatile bool _is_keyW;
    volatile bool _is_keyE;
    volatile bool _is_keyR;
    volatile bool _is_keyT;
    volatile bool _is_keyY;
    volatile bool _is_keyU;
    volatile bool _is_keyI;
    volatile bool _is_keyO;
    volatile bool _is_keyP;
    volatile bool _is_keyDELETE;
    volatile bool _is_keyEND;
    volatile bool _is_keyPAGEDOWN;
    volatile bool _is_keyCAPSLOCK;
    volatile bool _is_keyA;
    volatile bool _is_keyS;
    volatile bool _is_keyD;
    volatile bool _is_keyF;
    volatile bool _is_keyG;
    volatile bool _is_keyH;
    volatile bool _is_keyJ;
    volatile bool _is_keyK;
    volatile bool _is_keyL;
    volatile bool _is_keyENTER;
    volatile bool _is_keySHIFTLEFT;
    volatile bool _is_keyZ;
    volatile bool _is_keyX;
    volatile bool _is_keyC;
    volatile bool _is_keyV;
    volatile bool _is_keyB;
    volatile bool _is_keyN;
    volatile bool _is_keyM;
    volatile bool _is_keySHIFTRIGHT;
    volatile bool _is_keyARROWUP;
    volatile bool _is_keyCTRLLEFT;
    volatile bool _is_keyAPPLEFT;
    volatile bool _is_keyALT;
    volatile bool _is_keySPACE;
    volatile bool _is_keyALTGR;
    volatile bool _is_keyAPPRIGHT;
    volatile bool _is_keyMENU;
    volatile bool _is_keyCTRLRIGHT;
    volatile bool _is_keyARROWLEFT;
    volatile bool _is_keyARROWDOWN;
    volatile bool _is_keyARROWRIGHT;
    volatile bool _is_keyPAD0;
    volatile bool _is_keyPAD1;
    volatile bool _is_keyPAD2;
    volatile bool _is_keyPAD3;
    volatile bool _is_keyPAD4;
    volatile bool _is_keyPAD5;
    volatile bool _is_keyPAD6;
    volatile bool _is_keyPAD7;
    volatile bool _is_keyPAD8;
    volatile bool _is_keyPAD9;
    volatile bool _is_keyPADADD;
    volatile bool _is_keyPADSUB;
    volatile bool _is_keyPADMUL;
    volatile bool _is_keyPADDIV;

    //! Fullscreen state of the display.
    bool _is_fullscreen;

    // Internal variables.
    float _fps_fps, _min, _max;
    unsigned long _timer, _fps_frames, _fps_timer;

    //@}
    //---------------------------
    //
    //! \name Plugins
    //@{
    //---------------------------

#ifdef cimgdisplay_plugin
#include cimgdisplay_plugin
#endif
#ifdef cimgdisplay_plugin1
#include cimgdisplay_plugin1
#endif
#ifdef cimgdisplay_plugin2
#include cimgdisplay_plugin2
#endif
#ifdef cimgdisplay_plugin3
#include cimgdisplay_plugin3
#endif
#ifdef cimgdisplay_plugin4
#include cimgdisplay_plugin4
#endif
#ifdef cimgdisplay_plugin5
#include cimgdisplay_plugin5
#endif
#ifdef cimgdisplay_plugin6
#include cimgdisplay_plugin6
#endif
#ifdef cimgdisplay_plugin7
#include cimgdisplay_plugin7
#endif
#ifdef cimgdisplay_plugin8
#include cimgdisplay_plugin8
#endif

    //@}
    //--------------------------------------------------------
    //
    //! \name Constructors / Destructor / Instance Management
    //@{
    //--------------------------------------------------------

    //! Destructor.
    ~CImgDisplay() {
      assign();
    }

    //! Create an empty display window.
    CImgDisplay():
      _width(0),_height(0),_window_width(0),_window_height(0),_window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),
      _normalization(0),_title(0),_button(0),_wheel(0),_is_closed(true),_is_resized(false),_is_moved(false),_is_event(false),
      _is_fullscreen(false),_min(0),_max(0) {
      assign();
    }

    //! Create a display window with a specified size \p pwidth x \p height.
    /** \param width Width of the display window.
        \param height Height of the display window.
        \param title Title of the display window.
        \param normalization Normalization type of the display window (0=none, 1=always, 2=once).
        \param is_fullscreen : Fullscreen mode.
        \param is_closed : Initially visible mode.
        A black image will be initially displayed in the display window.
    **/
    CImgDisplay(const unsigned int width, const unsigned int height,
                const char *const title=0, const unsigned int normalization=3,
                const bool is_fullscreen=false, const bool is_closed=false):
      _width(0),_height(0),_window_width(0),_window_height(0),_window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),
      _normalization(0),_title(0),_button(0),_wheel(0),_is_closed(true),_is_resized(false),_is_moved(false),_is_event(false),
      _is_fullscreen(false),_min(0),_max(0) {
      assign(width,height,title,normalization,is_fullscreen,is_closed);
    }

    //! Create a display window from an image.
    /** \param img : Image that will be used to create the display window.
        \param title : Title of the display window
        \param normalization : Normalization type of the display window.
        \param is_fullscreen : Fullscreen mode.
        \param is_closed : Initially visible mode.
    **/
    template<typename T>
    explicit CImgDisplay(const CImg<T>& img,
                         const char *const title=0, const unsigned int normalization=3,
                         const bool is_fullscreen=false, const bool is_closed=false):
      _width(0),_height(0),_window_width(0),_window_height(0),_window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),
      _normalization(0),_title(0),_button(0),_wheel(0),_is_closed(true),_is_resized(false),_is_moved(false),_is_event(false),
      _is_fullscreen(false),_min(0),_max(0) {
      assign(img,title,normalization,is_fullscreen,is_closed);
    }

    //! Create a display window from an image list.
    /** \param list : The list of images to display.
        \param title : Title of the display window
        \param normalization : Normalization type of the display window.
        \param is_fullscreen : Fullscreen mode.
        \param is_closed : Initially visible mode.
    **/
    template<typename T>
    explicit CImgDisplay(const CImgList<T>& list,
                         const char *const title=0, const unsigned int normalization=3,
                         const bool is_fullscreen=false, const bool is_closed=false):
      _width(0),_height(0),_window_width(0),_window_height(0),_window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),
      _normalization(0),_title(0),_button(0),_wheel(0),_is_closed(true),_is_resized(false),_is_moved(false),_is_event(false),
      _is_fullscreen(false),_min(0),_max(0) {
      assign(list,title,normalization,is_fullscreen,is_closed);
    }

    //! Create a display window by copying another one.
    /**
        \param disp  : Display window to copy.
    **/
    CImgDisplay(const CImgDisplay& disp):
      _width(0),_height(0),_window_width(0),_window_height(0),_window_x(0),_window_y(0),_mouse_x(-1),_mouse_y(-1),
      _normalization(0),_title(0),_button(0),_wheel(0),_is_closed(true),_is_resized(false),_is_moved(false),_is_event(false),
      _is_fullscreen(false),_min(0),_max(0) {
      assign(disp);
    }

#if cimg_display==0

    static void _no_display_exception() {
      throw CImgIOException("CImgDisplay() : No display available.");
    }

    //! In-place version of the destructor.
    CImgDisplay& assign() {
      _no_display_exception();
      return flush();
    }

    //! In-place version of the constructor.
    CImgDisplay& assign(const unsigned int width, const unsigned int height,
                        const char *const title=0, const unsigned int normalization=3,
                        const bool is_fullscreen=false, const bool is_closed=false) {
      cimg::unused(width,height,title,normalization,is_fullscreen,is_closed);
      return assign();
    }

    //! In-place version of the constructor.
    template<typename T>
    CImgDisplay& assign(const CImg<T>& img,
                        const char *const title=0, const unsigned int normalization=3,
                        const bool is_fullscreen=false, const bool is_closed=false) {
      return assign(img._width,img._height,title,normalization,is_fullscreen,is_closed);
    }

    //! In-place version of the constructor.
    template<typename T>
    CImgDisplay& assign(const CImgList<T>& list,
                        const char *const title=0, const unsigned int normalization=3,
                        const bool is_fullscreen=false, const bool is_closed=false) {
      return assign(list._width,list._width,title,normalization,is_fullscreen,is_closed);
    }

    //! In-place version of the constructor.
    CImgDisplay& assign(const CImgDisplay &disp) {
      return assign(disp._width,disp._height);
    }

#endif

    //! Return a reference to an empty display.
    static CImgDisplay& empty() {
      static CImgDisplay _empty;
      return _empty.assign();
    }

#define cimg_fitscreen(dx,dy,dz) CImgDisplay::_fitscreen(dx,dy,dz,256,-85,false),CImgDisplay::_fitscreen(dx,dy,dz,256,-85,true)
    static unsigned int _fitscreen(const unsigned int dx, const unsigned int dy, const unsigned int dz,
                                   const int dmin, const int dmax,const bool return_y) {
      unsigned int nw = dx + (dz>1?dz:0), nh = dy + (dz>1?dz:0);
      const unsigned int
        sw = CImgDisplay::screen_width(), sh = CImgDisplay::screen_height(),
        mw = dmin<0?(unsigned int)(sw*-dmin/100):(unsigned int)dmin,
        mh = dmin<0?(unsigned int)(sh*-dmin/100):(unsigned int)dmin,
        Mw = dmax<0?(unsigned int)(sw*-dmax/100):(unsigned int)dmax,
        Mh = dmax<0?(unsigned int)(sh*-dmax/100):(unsigned int)dmax;
      if (nw<mw) { nh = nh*mw/nw; nh+=(nh==0?1:0); nw = mw; }
      if (nh<mh) { nw = nw*mh/nh; nw+=(nw==0?1:0); nh = mh; }
      if (nw>Mw) { nh = nh*Mw/nw; nh+=(nh==0?1:0); nw = Mw; }
      if (nh>Mh) { nw = nw*Mh/nh; nw+=(nw==0?1:0); nh = Mh; }
      if (nw<mw) nw = mw;
      if (nh<mh) nh = mh;
      return return_y?nh:nw;
    }

    //@}
    //------------------------------------------
    //
    //! \name Overloaded Operators
    //@{
    //------------------------------------------

    // Operator=().
    template<typename t>
    CImgDisplay& operator=(const CImg<t>& img) {
      return display(img);
    }

    // Operator=().
    template<typename t>
    CImgDisplay& operator=(const CImgList<t>& list) {
      return display(list);
    }

    //! Operator=().
    CImgDisplay& operator=(const CImgDisplay& disp) {
      return assign(disp);
    }

    //! Return true if display is not empty.
    operator bool() const {
      return !is_empty();
    }

    //@}
    //------------------------------------------
    //
    //! \name Instance Checking
    //@{
    //------------------------------------------

    //! Return true is display is empty.
    bool is_empty() const {
      return !(_width && _height);
    }

    bool is_closed() const {
      return _is_closed;
    }

    bool is_resized() const {
      return _is_resized;
    }

    bool is_moved() const {
      return _is_moved;
    }

    bool is_event() const {
      return _is_event;
    }

    bool is_fullscreen() const {
      return _is_fullscreen;
    }

    bool is_key() const {
      return _is_keyESC || _is_keyF1 || _is_keyF2 || _is_keyF3 ||
        _is_keyF4 || _is_keyF5 || _is_keyF6 || _is_keyF7 ||
        _is_keyF8 || _is_keyF9 || _is_keyF10 || _is_keyF11 ||
        _is_keyF12 || _is_keyPAUSE || _is_key1 || _is_key2 ||
        _is_key3 || _is_key4 || _is_key5 || _is_key6 ||
        _is_key7 || _is_key8 || _is_key9 || _is_key0 ||
        _is_keyBACKSPACE || _is_keyINSERT || _is_keyHOME ||
        _is_keyPAGEUP || _is_keyTAB || _is_keyQ || _is_keyW ||
        _is_keyE || _is_keyR || _is_keyT || _is_keyY ||
        _is_keyU || _is_keyI || _is_keyO || _is_keyP ||
        _is_keyDELETE || _is_keyEND || _is_keyPAGEDOWN ||
        _is_keyCAPSLOCK || _is_keyA || _is_keyS || _is_keyD ||
        _is_keyF || _is_keyG || _is_keyH || _is_keyJ ||
        _is_keyK || _is_keyL || _is_keyENTER ||
        _is_keySHIFTLEFT || _is_keyZ || _is_keyX || _is_keyC ||
        _is_keyV || _is_keyB || _is_keyN || _is_keyM ||
        _is_keySHIFTRIGHT || _is_keyARROWUP || _is_keyCTRLLEFT ||
        _is_keyAPPLEFT || _is_keyALT || _is_keySPACE || _is_keyALTGR ||
        _is_keyAPPRIGHT || _is_keyMENU || _is_keyCTRLRIGHT ||
        _is_keyARROWLEFT || _is_keyARROWDOWN || _is_keyARROWRIGHT ||
        _is_keyPAD0 || _is_keyPAD1 || _is_keyPAD2 ||
        _is_keyPAD3 || _is_keyPAD4 || _is_keyPAD5 ||
        _is_keyPAD6 || _is_keyPAD7 || _is_keyPAD8 ||
        _is_keyPAD9 || _is_keyPADADD || _is_keyPADSUB ||
        _is_keyPADMUL || _is_keyPADDIV;
    }

#define _cimg_iskey_def(k) \
    bool is_key##k() const { \
      return _is_key##k; \
    }
    _cimg_iskey_def(ESC); _cimg_iskey_def(F1); _cimg_iskey_def(F2); _cimg_iskey_def(F3);
    _cimg_iskey_def(F4); _cimg_iskey_def(F5); _cimg_iskey_def(F6); _cimg_iskey_def(F7);
    _cimg_iskey_def(F8); _cimg_iskey_def(F9); _cimg_iskey_def(F10); _cimg_iskey_def(F11);
    _cimg_iskey_def(F12); _cimg_iskey_def(PAUSE); _cimg_iskey_def(1); _cimg_iskey_def(2);
    _cimg_iskey_def(3); _cimg_iskey_def(4); _cimg_iskey_def(5); _cimg_iskey_def(6);
    _cimg_iskey_def(7); _cimg_iskey_def(8); _cimg_iskey_def(9); _cimg_iskey_def(0);
    _cimg_iskey_def(BACKSPACE); _cimg_iskey_def(INSERT); _cimg_iskey_def(HOME);
    _cimg_iskey_def(PAGEUP); _cimg_iskey_def(TAB); _cimg_iskey_def(Q); _cimg_iskey_def(W);
    _cimg_iskey_def(E); _cimg_iskey_def(R); _cimg_iskey_def(T); _cimg_iskey_def(Y);
    _cimg_iskey_def(U); _cimg_iskey_def(I); _cimg_iskey_def(O); _cimg_iskey_def(P);
    _cimg_iskey_def(DELETE); _cimg_iskey_def(END); _cimg_iskey_def(PAGEDOWN);
    _cimg_iskey_def(CAPSLOCK); _cimg_iskey_def(A); _cimg_iskey_def(S); _cimg_iskey_def(D);
    _cimg_iskey_def(F); _cimg_iskey_def(G); _cimg_iskey_def(H); _cimg_iskey_def(J);
    _cimg_iskey_def(K); _cimg_iskey_def(L); _cimg_iskey_def(ENTER);
    _cimg_iskey_def(SHIFTLEFT); _cimg_iskey_def(Z); _cimg_iskey_def(X); _cimg_iskey_def(C);
    _cimg_iskey_def(V); _cimg_iskey_def(B); _cimg_iskey_def(N); _cimg_iskey_def(M);
    _cimg_iskey_def(SHIFTRIGHT); _cimg_iskey_def(ARROWUP); _cimg_iskey_def(CTRLLEFT);
    _cimg_iskey_def(APPLEFT); _cimg_iskey_def(ALT); _cimg_iskey_def(SPACE); _cimg_iskey_def(ALTGR);
    _cimg_iskey_def(APPRIGHT); _cimg_iskey_def(MENU); _cimg_iskey_def(CTRLRIGHT);
    _cimg_iskey_def(ARROWLEFT); _cimg_iskey_def(ARROWDOWN); _cimg_iskey_def(ARROWRIGHT);
    _cimg_iskey_def(PAD0); _cimg_iskey_def(PAD1); _cimg_iskey_def(PAD2);
    _cimg_iskey_def(PAD3); _cimg_iskey_def(PAD4); _cimg_iskey_def(PAD5);
    _cimg_iskey_def(PAD6); _cimg_iskey_def(PAD7); _cimg_iskey_def(PAD8);
    _cimg_iskey_def(PAD9); _cimg_iskey_def(PADADD); _cimg_iskey_def(PADSUB);
    _cimg_iskey_def(PADMUL); _cimg_iskey_def(PADDIV);

    bool is_key(const unsigned int key) const {
#define _cimg_iskey_test(k) if (key==cimg::key##k) return _is_key##k;
      _cimg_iskey_test(ESC); _cimg_iskey_test(F1); _cimg_iskey_test(F2); _cimg_iskey_test(F3);
      _cimg_iskey_test(F4); _cimg_iskey_test(F5); _cimg_iskey_test(F6); _cimg_iskey_test(F7);
      _cimg_iskey_test(F8); _cimg_iskey_test(F9); _cimg_iskey_test(F10); _cimg_iskey_test(F11);
      _cimg_iskey_test(F12); _cimg_iskey_test(PAUSE); _cimg_iskey_test(1); _cimg_iskey_test(2);
      _cimg_iskey_test(3); _cimg_iskey_test(4); _cimg_iskey_test(5); _cimg_iskey_test(6);
      _cimg_iskey_test(7); _cimg_iskey_test(8); _cimg_iskey_test(9); _cimg_iskey_test(0);
      _cimg_iskey_test(BACKSPACE); _cimg_iskey_test(INSERT); _cimg_iskey_test(HOME);
      _cimg_iskey_test(PAGEUP); _cimg_iskey_test(TAB); _cimg_iskey_test(Q); _cimg_iskey_test(W);
      _cimg_iskey_test(E); _cimg_iskey_test(R); _cimg_iskey_test(T); _cimg_iskey_test(Y);
      _cimg_iskey_test(U); _cimg_iskey_test(I); _cimg_iskey_test(O); _cimg_iskey_test(P);
      _cimg_iskey_test(DELETE); _cimg_iskey_test(END); _cimg_iskey_test(PAGEDOWN);
      _cimg_iskey_test(CAPSLOCK); _cimg_iskey_test(A); _cimg_iskey_test(S); _cimg_iskey_test(D);
      _cimg_iskey_test(F); _cimg_iskey_test(G); _cimg_iskey_test(H); _cimg_iskey_test(J);
      _cimg_iskey_test(K); _cimg_iskey_test(L); _cimg_iskey_test(ENTER);
      _cimg_iskey_test(SHIFTLEFT); _cimg_iskey_test(Z); _cimg_iskey_test(X); _cimg_iskey_test(C);
      _cimg_iskey_test(V); _cimg_iskey_test(B); _cimg_iskey_test(N); _cimg_iskey_test(M);
      _cimg_iskey_test(SHIFTRIGHT); _cimg_iskey_test(ARROWUP); _cimg_iskey_test(CTRLLEFT);
      _cimg_iskey_test(APPLEFT); _cimg_iskey_test(ALT); _cimg_iskey_test(SPACE); _cimg_iskey_test(ALTGR);
      _cimg_iskey_test(APPRIGHT); _cimg_iskey_test(MENU); _cimg_iskey_test(CTRLRIGHT);
      _cimg_iskey_test(ARROWLEFT); _cimg_iskey_test(ARROWDOWN); _cimg_iskey_test(ARROWRIGHT);
      _cimg_iskey_test(PAD0); _cimg_iskey_test(PAD1); _cimg_iskey_test(PAD2);
      _cimg_iskey_test(PAD3); _cimg_iskey_test(PAD4); _cimg_iskey_test(PAD5);
      _cimg_iskey_test(PAD6); _cimg_iskey_test(PAD7); _cimg_iskey_test(PAD8);
      _cimg_iskey_test(PAD9); _cimg_iskey_test(PADADD); _cimg_iskey_test(PADSUB);
      _cimg_iskey_test(PADMUL); _cimg_iskey_test(PADDIV);
      return false;
    }

    //! Get keycode corresponding to given input string.
    bool is_key(const char *const textcode) const {
#define _cimg_iskey_test2(k) if (!cimg::strcasecmp(textcode,#k)) return _is_key##k;
      _cimg_iskey_test2(ESC); _cimg_iskey_test2(F1); _cimg_iskey_test2(F2); _cimg_iskey_test2(F3);
      _cimg_iskey_test2(F4); _cimg_iskey_test2(F5); _cimg_iskey_test2(F6); _cimg_iskey_test2(F7);
      _cimg_iskey_test2(F8); _cimg_iskey_test2(F9); _cimg_iskey_test2(F10); _cimg_iskey_test2(F11);
      _cimg_iskey_test2(F12); _cimg_iskey_test2(PAUSE); _cimg_iskey_test2(1); _cimg_iskey_test2(2);
      _cimg_iskey_test2(3); _cimg_iskey_test2(4); _cimg_iskey_test2(5); _cimg_iskey_test2(6);
      _cimg_iskey_test2(7); _cimg_iskey_test2(8); _cimg_iskey_test2(9); _cimg_iskey_test2(0);
      _cimg_iskey_test2(BACKSPACE); _cimg_iskey_test2(INSERT); _cimg_iskey_test2(HOME);
      _cimg_iskey_test2(PAGEUP); _cimg_iskey_test2(TAB); _cimg_iskey_test2(Q); _cimg_iskey_test2(W);
      _cimg_iskey_test2(E); _cimg_iskey_test2(R); _cimg_iskey_test2(T); _cimg_iskey_test2(Y);
      _cimg_iskey_test2(U); _cimg_iskey_test2(I); _cimg_iskey_test2(O); _cimg_iskey_test2(P);
      _cimg_iskey_test2(DELETE); _cimg_iskey_test2(END); _cimg_iskey_test2(PAGEDOWN);
      _cimg_iskey_test2(CAPSLOCK); _cimg_iskey_test2(A); _cimg_iskey_test2(S); _cimg_iskey_test2(D);
      _cimg_iskey_test2(F); _cimg_iskey_test2(G); _cimg_iskey_test2(H); _cimg_iskey_test2(J);
      _cimg_iskey_test2(K); _cimg_iskey_test2(L); _cimg_iskey_test2(ENTER);
      _cimg_iskey_test2(SHIFTLEFT); _cimg_iskey_test2(Z); _cimg_iskey_test2(X); _cimg_iskey_test2(C);
      _cimg_iskey_test2(V); _cimg_iskey_test2(B); _cimg_iskey_test2(N); _cimg_iskey_test2(M);
      _cimg_iskey_test2(SHIFTRIGHT); _cimg_iskey_test2(ARROWUP); _cimg_iskey_test2(CTRLLEFT);
      _cimg_iskey_test2(APPLEFT); _cimg_iskey_test2(ALT); _cimg_iskey_test2(SPACE); _cimg_iskey_test2(ALTGR);
      _cimg_iskey_test2(APPRIGHT); _cimg_iskey_test2(MENU); _cimg_iskey_test2(CTRLRIGHT);
      _cimg_iskey_test2(ARROWLEFT); _cimg_iskey_test2(ARROWDOWN); _cimg_iskey_test2(ARROWRIGHT);
      _cimg_iskey_test2(PAD0); _cimg_iskey_test2(PAD1); _cimg_iskey_test2(PAD2);
      _cimg_iskey_test2(PAD3); _cimg_iskey_test2(PAD4); _cimg_iskey_test2(PAD5);
      _cimg_iskey_test2(PAD6); _cimg_iskey_test2(PAD7); _cimg_iskey_test2(PAD8);
      _cimg_iskey_test2(PAD9); _cimg_iskey_test2(PADADD); _cimg_iskey_test2(PADSUB);
      _cimg_iskey_test2(PADMUL); _cimg_iskey_test2(PADDIV);
      return false;
    }

    //! Test if a key sequence has been typed.
    bool is_key_sequence(const unsigned int *const key_sequence, const unsigned int length, const bool remove_sequence=false) {
      if (key_sequence && length) {
        const unsigned int
          *const ps_end = key_sequence + length - 1,
          *const pk_end = (unsigned int*)_keys + 1 + sizeof(_keys)/sizeof(unsigned int) - length,
          k = *ps_end;
        for (unsigned int *pk = (unsigned int*)_keys; pk<pk_end; ) {
          if (*(pk++)==k) {
            bool res = true;
            const unsigned int *ps = ps_end, *pk2 = pk;
            for (unsigned int i = 1; i<length; ++i) res = (*(--ps)==*(pk2++));
            if (res) {
              if (remove_sequence) std::memset((void*)(pk-1),0,sizeof(unsigned int)*length);
              return true;
            }
          }
        }
      }
      return false;
    }

    //@}
    //------------------------------------------
    //
    //! \name Instance Characteristics
    //@{
    //------------------------------------------

    //! Return display width.
    int width() const {
      return (int)_width;
    }

    //! Return display height.
    int height() const {
      return (int)_height;
    }

    //! Return X-coordinate of the mouse pointer.
    int mouse_x() const {
      return _mouse_x;
    }

    //! Return Y-coordinate of the mouse pointer.
    int mouse_y() const {
      return _mouse_y;
    }

    //! Return current or previous state of the mouse buttons.
    unsigned int button() const {
      return _button;
    }

    //! Return current state of the mouse wheel.
    int wheel() const {
      return _wheel;
    }

    //! Return current or previous state of the keyboard.
    unsigned int key(const unsigned int pos=0) const {
      return pos<(sizeof(_keys)/sizeof(unsigned int))?_keys[pos]:0;
    }

    unsigned int released_key(const unsigned int pos=0) const {
      return pos<(sizeof(_released_keys)/sizeof(unsigned int))?_released_keys[pos]:0;
    }

    //! Get keycode corresponding to given input string.
    static unsigned int keycode(const char *const textcode) {
#define _cimg_keycode(k) if (!cimg::strcasecmp(textcode,#k)) return cimg::key##k;
      _cimg_keycode(ESC); _cimg_keycode(F1); _cimg_keycode(F2); _cimg_keycode(F3);
      _cimg_keycode(F4); _cimg_keycode(F5); _cimg_keycode(F6); _cimg_keycode(F7);
      _cimg_keycode(F8); _cimg_keycode(F9); _cimg_keycode(F10); _cimg_keycode(F11);
      _cimg_keycode(F12); _cimg_keycode(PAUSE); _cimg_keycode(1); _cimg_keycode(2);
      _cimg_keycode(3); _cimg_keycode(4); _cimg_keycode(5); _cimg_keycode(6);
      _cimg_keycode(7); _cimg_keycode(8); _cimg_keycode(9); _cimg_keycode(0);
      _cimg_keycode(BACKSPACE); _cimg_keycode(INSERT); _cimg_keycode(HOME);
      _cimg_keycode(PAGEUP); _cimg_keycode(TAB); _cimg_keycode(Q); _cimg_keycode(W);
      _cimg_keycode(E); _cimg_keycode(R); _cimg_keycode(T); _cimg_keycode(Y);
      _cimg_keycode(U); _cimg_keycode(I); _cimg_keycode(O); _cimg_keycode(P);
      _cimg_keycode(DELETE); _cimg_keycode(END); _cimg_keycode(PAGEDOWN);
      _cimg_keycode(CAPSLOCK); _cimg_keycode(A); _cimg_keycode(S); _cimg_keycode(D);
      _cimg_keycode(F); _cimg_keycode(G); _cimg_keycode(H); _cimg_keycode(J);
      _cimg_keycode(K); _cimg_keycode(L); _cimg_keycode(ENTER);
      _cimg_keycode(SHIFTLEFT); _cimg_keycode(Z); _cimg_keycode(X); _cimg_keycode(C);
      _cimg_keycode(V); _cimg_keycode(B); _cimg_keycode(N); _cimg_keycode(M);
      _cimg_keycode(SHIFTRIGHT); _cimg_keycode(ARROWUP); _cimg_keycode(CTRLLEFT);
      _cimg_keycode(APPLEFT); _cimg_keycode(ALT); _cimg_keycode(SPACE); _cimg_keycode(ALTGR);
      _cimg_keycode(APPRIGHT); _cimg_keycode(MENU); _cimg_keycode(CTRLRIGHT);
      _cimg_keycode(ARROWLEFT); _cimg_keycode(ARROWDOWN); _cimg_keycode(ARROWRIGHT);
      _cimg_keycode(PAD0); _cimg_keycode(PAD1); _cimg_keycode(PAD2);
      _cimg_keycode(PAD3); _cimg_keycode(PAD4); _cimg_keycode(PAD5);
      _cimg_keycode(PAD6); _cimg_keycode(PAD7); _cimg_keycode(PAD8);
      _cimg_keycode(PAD9); _cimg_keycode(PADADD); _cimg_keycode(PADSUB);
      _cimg_keycode(PADMUL); _cimg_keycode(PADDIV);
      return 0;
    }

    //! Return normalization type of the display.
    unsigned int normalization() const {
      return _normalization;
    }

    //! Return title of the display.
    const char *title() const {
      return _title;
    }

    //! Return display window width.
    int window_width() const {
      return (int)_window_width;
    }

    //! Return display window height.
    int window_height() const {
      return (int)_window_height;
    }

    //! Return X-coordinate of the window.
    int window_x() const {
      return _window_x;
    }

    //! Return Y-coordinate of the window.
    int window_y() const {
      return _window_y;
    }

#if cimg_display==0

    //! Return the width of the screen resolution.
    static int screen_width() {
      _no_display_exception();
      return 0;
    }

    //! Return the height of the screen resolution.
    static int screen_height() {
      _no_display_exception();
      return 0;
    }

#endif

    //! Return the frame per second rate.
    float frames_per_second() {
      if (!_fps_timer) _fps_timer = cimg::time();
      const float delta = (cimg::time()-_fps_timer)/1000.0f;
      ++_fps_frames;
      if (delta>=1) {
        _fps_fps = _fps_frames/delta;
        _fps_frames = 0;
        _fps_timer = cimg::time();
      }
      return _fps_fps;
    }

    //@}
    //------------------------------------------
    //
    //! \name Display Manipulation
    //@{
    //------------------------------------------

#if cimg_display==0

    //! Display an image in a window.
    template<typename T>
    CImgDisplay& display(const CImg<T>& img) {
      return assign(img);
    }

#endif

    //! Display an image list CImgList<T> into a display window.
    /** First, all images of the list are appended into a single image used for visualization,
        then this image is displayed in the current display window.
        \param list  The list of images to display.
        \param axis  The axis used to append the image for visualization. Can be 'x' (default),'y','z' or 'c'.
        \param align Defines the relative alignment of images when displaying images of different sizes.
        Can be '\p c' (centered, which is the default), '\p p' (top alignment) and '\p n' (bottom aligment).
    **/
    template<typename T>
    CImgDisplay& display(const CImgList<T>& list, const char axis='x', const float align=0) {
      return display(list.get_append(axis,align));
    }

    //! Resize a display window in its current size.
    CImgDisplay& resize(const bool force_redraw=true) {
      resize(_window_width,_window_height,force_redraw);
      return *this;
    }

    //! Resize a display window with the size of an image.
    /** \param img    : Input image. \p image.width and \p image.height give the new dimensions of the display window.
        \param force_redraw : If \p true (default), the current displayed image in the display window will
        be bloc-interpolated to fit the new dimensions. If \p false, a black image will be drawn in the resized window.
    **/
    template<typename T>
    CImgDisplay& resize(const CImg<T>& img, const bool force_redraw=true) {
      return resize(img._width,img._height,force_redraw);
    }

    //! Resize a display window using the size of the given display \p disp.
    CImgDisplay& resize(const CImgDisplay& disp, const bool force_redraw=true) {
      return resize(disp._width,disp._height,force_redraw);
    }

#if cimg_display==0

    //! Resize window.
    CImgDisplay& resize(const int width, const int height, const bool force_redraw=true) {
      return assign(width,height,0,3,force_redraw);
    }

#endif

    // Render pixel buffer with size (wd,hd) from source buffer of size (ws,hs).
    template<typename t, typename T>
    static void _render_resize(const T *ptrs, const unsigned int ws, const unsigned int hs,
                               t *ptrd, const unsigned int wd, const unsigned int hd) {
      unsigned int *const offx = new unsigned int[wd], *const offy = new unsigned int[hd+1], *poffx, *poffy;
      float s, curr, old;
      s = (float)ws/wd;
      poffx = offx; curr = 0; for (unsigned int x = 0; x<wd; ++x) { old = curr; curr+=s; *(poffx++) = (unsigned int)curr - (unsigned int)old; }
      s = (float)hs/hd;
      poffy = offy; curr = 0; for (unsigned int y = 0; y<hd; ++y) { old = curr; curr+=s; *(poffy++) = ws*((unsigned int)curr - (unsigned int)old); }
      *poffy = 0;
      poffy = offy;
      for (unsigned int y = 0; y<hd; ) {
        const T *ptr = ptrs;
        poffx = offx;
        for (unsigned int x = 0; x<wd; ++x) { *(ptrd++) = *ptr; ptr+=*(poffx++); }
        ++y;
        unsigned int dy = *(poffy++);
        for ( ; !dy && y<hd; std::memcpy(ptrd,ptrd - wd,sizeof(t)*wd), ++y, ptrd+=wd, dy = *(poffy++)) {}
        ptrs+=dy;
      }
      delete[] offx; delete[] offy;
    }

    //! Set fullscreen mode.
    CImgDisplay& set_fullscreen(const bool is_fullscreen, const bool force_redraw=true) {
      if (is_empty() || _is_fullscreen==is_fullscreen) return *this;
      return toggle_fullscreen(force_redraw);
    }

#if cimg_display==0

    //! Toggle fullscreen mode.
    CImgDisplay& toggle_fullscreen(const bool force_redraw=true) {
      return assign(_width,_height,0,3,force_redraw);
    }

    //! Show a closed display.
    CImgDisplay& show() {
      return assign();
    }

    //! Close a visible display.
    CImgDisplay& close() {
      return assign();
    }

    //! Move window.
    CImgDisplay& move(const int pos_x, const int pos_y) {
      return assign(pos_x,pos_y);
    }

    //! Show mouse pointer.
    CImgDisplay& show_mouse() {
      return assign();
    }

    //! Hide mouse pointer.
    CImgDisplay& hide_mouse() {
      return assign();
    }

    //! Move mouse pointer to a specific location.
    CImgDisplay& set_mouse(const int pos_x, const int pos_y) {
      return assign(pos_x,pos_y);
    }

    CImgDisplay& set_title(const char *const format, ...) {
      return assign(0,0,format);
    }

    //! Render image buffer into GDI native image format.
    template<typename T>
    CImgDisplay& render(const CImg<T>& img) {
      return assign(img);
    }

    //! Re-paint image content in window.
    CImgDisplay& paint() {
      return assign();
    }

    //! Take a snapshot of the display in the specified image.
    template<typename T>
    const CImgDisplay& snapshot(CImg<T>& img) const {
      _no_display_exception();
      return *this;
    }
#endif

    //! Simulate a mouse button event.
    CImgDisplay& set_button() {
      _button = 0;
      _is_event = true;
      return *this;
    }

    CImgDisplay& set_button(const unsigned int button, const bool is_pressed=true) {
      const unsigned int buttoncode = button==1?1:button==2?2:button==3?4:0;
      if (is_pressed) _button |= buttoncode; else _button &= ~buttoncode;
      _is_event = buttoncode?true:false;
      return *this;
    }

    //! Simulate a mouse wheel event, or flush wheel events.
    CImgDisplay& set_wheel() {
      _wheel = 0;
      _is_event = true;
      return *this;
    }

    CImgDisplay& set_wheel(const int amplitude) {
      _wheel+=amplitude;
      _is_event = amplitude?true:false;
      return *this;
    }

    //! Simulate a keyboard press/release event, or flush all key events.
    CImgDisplay& set_key() {
      std::memset((void*)_keys,0,sizeof(_keys));
      std::memset((void*)_released_keys,0,sizeof(_released_keys));
      _is_keyESC = _is_keyF1 = _is_keyF2 = _is_keyF3 = _is_keyF4 = _is_keyF5 = _is_keyF6 = _is_keyF7 = _is_keyF8 = _is_keyF9 =
        _is_keyF10 = _is_keyF11 = _is_keyF12 = _is_keyPAUSE = _is_key1 = _is_key2 = _is_key3 = _is_key4 = _is_key5 = _is_key6 =
        _is_key7 = _is_key8 = _is_key9 = _is_key0 = _is_keyBACKSPACE = _is_keyINSERT = _is_keyHOME = _is_keyPAGEUP = _is_keyTAB =
        _is_keyQ = _is_keyW = _is_keyE = _is_keyR = _is_keyT = _is_keyY = _is_keyU = _is_keyI = _is_keyO = _is_keyP = _is_keyDELETE =
        _is_keyEND = _is_keyPAGEDOWN = _is_keyCAPSLOCK = _is_keyA = _is_keyS = _is_keyD = _is_keyF = _is_keyG = _is_keyH = _is_keyJ =
        _is_keyK = _is_keyL = _is_keyENTER = _is_keySHIFTLEFT = _is_keyZ = _is_keyX = _is_keyC = _is_keyV = _is_keyB = _is_keyN =
        _is_keyM = _is_keySHIFTRIGHT = _is_keyARROWUP = _is_keyCTRLLEFT = _is_keyAPPLEFT = _is_keyALT = _is_keySPACE = _is_keyALTGR = _is_keyAPPRIGHT =
        _is_keyMENU = _is_keyCTRLRIGHT = _is_keyARROWLEFT = _is_keyARROWDOWN = _is_keyARROWRIGHT = _is_keyPAD0 = _is_keyPAD1 = _is_keyPAD2 =
        _is_keyPAD3 = _is_keyPAD4 = _is_keyPAD5 = _is_keyPAD6 = _is_keyPAD7 = _is_keyPAD8 = _is_keyPAD9 = _is_keyPADADD = _is_keyPADSUB =
        _is_keyPADMUL = _is_keyPADDIV = false;
      _is_event = true;
      return *this;
    }

    CImgDisplay& set_key(const unsigned int keycode, const bool pressed=true) {
#define _cimg_set_key(k) if (keycode==cimg::key##k) _is_key##k = pressed;
      _cimg_set_key(ESC); _cimg_set_key(F1); _cimg_set_key(F2); _cimg_set_key(F3);
      _cimg_set_key(F4); _cimg_set_key(F5); _cimg_set_key(F6); _cimg_set_key(F7);
      _cimg_set_key(F8); _cimg_set_key(F9); _cimg_set_key(F10); _cimg_set_key(F11);
      _cimg_set_key(F12); _cimg_set_key(PAUSE); _cimg_set_key(1); _cimg_set_key(2);
      _cimg_set_key(3); _cimg_set_key(4); _cimg_set_key(5); _cimg_set_key(6);
      _cimg_set_key(7); _cimg_set_key(8); _cimg_set_key(9); _cimg_set_key(0);
      _cimg_set_key(BACKSPACE); _cimg_set_key(INSERT); _cimg_set_key(HOME);
      _cimg_set_key(PAGEUP); _cimg_set_key(TAB); _cimg_set_key(Q); _cimg_set_key(W);
      _cimg_set_key(E); _cimg_set_key(R); _cimg_set_key(T); _cimg_set_key(Y);
      _cimg_set_key(U); _cimg_set_key(I); _cimg_set_key(O); _cimg_set_key(P);
      _cimg_set_key(DELETE); _cimg_set_key(END); _cimg_set_key(PAGEDOWN);
      _cimg_set_key(CAPSLOCK); _cimg_set_key(A); _cimg_set_key(S); _cimg_set_key(D);
      _cimg_set_key(F); _cimg_set_key(G); _cimg_set_key(H); _cimg_set_key(J);
      _cimg_set_key(K); _cimg_set_key(L); _cimg_set_key(ENTER);
      _cimg_set_key(SHIFTLEFT); _cimg_set_key(Z); _cimg_set_key(X); _cimg_set_key(C);
      _cimg_set_key(V); _cimg_set_key(B); _cimg_set_key(N); _cimg_set_key(M);
      _cimg_set_key(SHIFTRIGHT); _cimg_set_key(ARROWUP); _cimg_set_key(CTRLLEFT);
      _cimg_set_key(APPLEFT); _cimg_set_key(ALT); _cimg_set_key(SPACE); _cimg_set_key(ALTGR);
      _cimg_set_key(APPRIGHT); _cimg_set_key(MENU); _cimg_set_key(CTRLRIGHT);
      _cimg_set_key(ARROWLEFT); _cimg_set_key(ARROWDOWN); _cimg_set_key(ARROWRIGHT);
      _cimg_set_key(PAD0); _cimg_set_key(PAD1); _cimg_set_key(PAD2);
      _cimg_set_key(PAD3); _cimg_set_key(PAD4); _cimg_set_key(PAD5);
      _cimg_set_key(PAD6); _cimg_set_key(PAD7); _cimg_set_key(PAD8);
      _cimg_set_key(PAD9); _cimg_set_key(PADADD); _cimg_set_key(PADSUB);
      _cimg_set_key(PADMUL); _cimg_set_key(PADDIV);
      if (pressed) {
        if (*_keys)
          std::memmove((void*)(_keys+1),(void*)_keys,sizeof(_keys) - sizeof(unsigned int));
        *_keys = keycode;
        if (*_released_keys) {
          std::memmove((void*)(_released_keys+1),(void*)_released_keys,sizeof(_released_keys) - sizeof(unsigned int));
          *_released_keys = 0;
        }
      } else {
        if (*_keys) {
          std::memmove((void*)(_keys+1),(void*)_keys,sizeof(_keys) - sizeof(unsigned int));
          *_keys = 0;
        }
        if (*_released_keys)
          std::memmove((void*)(_released_keys+1),(void*)_released_keys,sizeof(_released_keys) - sizeof(unsigned int));
        *_released_keys = keycode;
      }
      _is_event = keycode?true:false;
      return *this;
    }

    //! Flush all display events.
    CImgDisplay& flush() {
      set_key().set_button().set_wheel();
      _is_resized = _is_moved = _is_event = false;
      _fps_timer = _fps_frames = _timer = 0;
      _fps_fps = 0;
      return *this;
    }

    //! Synchronized waiting function. Same as cimg::wait().
    CImgDisplay& wait(const unsigned int milliseconds) {
      cimg::_sleep(milliseconds,_timer);
      return *this;
    }

    //! Wait for an event occuring on the current display.
    CImgDisplay& wait() {
      wait(*this);
      return *this;
    }

    //! Wait for any event occuring on the display \c disp1.
    static void wait(CImgDisplay& disp1) {
      disp1._is_event = 0;
      while (!disp1._is_closed && !disp1._is_event) wait_all();
    }

    //! Wait for any event occuring either on the display \c disp1 or \c disp2.
    static void wait(CImgDisplay& disp1, CImgDisplay& disp2) {
      disp1._is_event = disp2._is_event = 0;
      while ((!disp1._is_closed || !disp2._is_closed) &&
             !disp1._is_event && !disp2._is_event) wait_all();
    }

    //! Wait for any event occuring either on the display \c disp1, \c disp2 or \c disp3.
    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3) {
      disp1._is_event = disp2._is_event = disp3._is_event = 0;
      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed) &&
             !disp1._is_event && !disp2._is_event && !disp3._is_event) wait_all();
    }

    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3 or \c disp4.
    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4) {
      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = 0;
      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed) &&
             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event) wait_all();
    }

    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4 or \c disp5.
    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5) {
      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event = 0;
      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed) &&
             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event) wait_all();
    }

    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp6.
    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
                     CImgDisplay& disp6) {
      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
        disp6._is_event = 0;
      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
              !disp6._is_closed) &&
             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
             !disp6._is_event) wait_all();
    }

    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp7.
    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
                     CImgDisplay& disp6, CImgDisplay& disp7) {
      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
        disp6._is_event = disp7._is_event = 0;
      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
              !disp6._is_closed || !disp7._is_closed) &&
             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
             !disp6._is_event && !disp7._is_event) wait_all();
    }

    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp8.
    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
                     CImgDisplay& disp6, CImgDisplay& disp7, CImgDisplay& disp8) {
      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
        disp6._is_event = disp7._is_event = disp8._is_event = 0;
      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
              !disp6._is_closed || !disp7._is_closed || !disp8._is_closed) &&
             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
             !disp6._is_event && !disp7._is_event && !disp8._is_event) wait_all();
    }

    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp9.
    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
                     CImgDisplay& disp6, CImgDisplay& disp7, CImgDisplay& disp8, CImgDisplay& disp9) {
      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
        disp6._is_event = disp7._is_event = disp8._is_event = disp9._is_event = 0;
      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
              !disp6._is_closed || !disp7._is_closed || !disp8._is_closed || !disp9._is_closed) &&
             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
             !disp6._is_event && !disp7._is_event && !disp8._is_event && !disp9._is_event) wait_all();
    }

    //! Wait for any event occuring either on the display \c disp1, \c disp2, \c disp3, \c disp4, ... \c disp10.
    static void wait(CImgDisplay& disp1, CImgDisplay& disp2, CImgDisplay& disp3, CImgDisplay& disp4, CImgDisplay& disp5,
                     CImgDisplay& disp6, CImgDisplay& disp7, CImgDisplay& disp8, CImgDisplay& disp9, CImgDisplay& disp10) {
      disp1._is_event = disp2._is_event = disp3._is_event = disp4._is_event = disp5._is_event =
        disp6._is_event = disp7._is_event = disp8._is_event = disp9._is_event = disp10._is_event = 0;
      while ((!disp1._is_closed || !disp2._is_closed || !disp3._is_closed || !disp4._is_closed || !disp5._is_closed ||
              !disp6._is_closed || !disp7._is_closed || !disp8._is_closed || !disp9._is_closed || !disp10._is_closed) &&
             !disp1._is_event && !disp2._is_event && !disp3._is_event && !disp4._is_event && !disp5._is_event &&
             !disp6._is_event && !disp7._is_event && !disp8._is_event && !disp9._is_event && !disp10._is_event) wait_all();
    }

#if cimg_display==0

    //! Wait for a window event in any CImg window.
    static void wait_all() {
      return _no_display_exception();
    }

#endif

    // X11-based implementation
    //--------------------------
#if cimg_display==1

    Atom _wm_window_atom, _wm_protocol_atom;
    Window _window, _background_window;
    Colormap _colormap;
    XImage *_image;
    void *_data;
#ifdef cimg_use_xshm
    XShmSegmentInfo *_shminfo;
#endif

    static int screen_width() {
      Display *const dpy = cimg::X11_attr().display;
      int res = 0;
      if (!dpy) {
        Display *const _dpy = XOpenDisplay(0);
        if (!_dpy)
          throw CImgIOException("CImgDisplay::screen_width() : Failed to open X11 display.");
        res = DisplayWidth(_dpy,DefaultScreen(_dpy));
        XCloseDisplay(_dpy);
      } else {
#ifdef cimg_use_xrandr
        if (cimg::X11_attr().resolutions && cimg::X11_attr().curr_resolution)
          res = cimg::X11_attr().resolutions[cimg::X11_attr().curr_resolution].width;
        else res = DisplayWidth(dpy,DefaultScreen(dpy));
#else
        res = DisplayWidth(dpy,DefaultScreen(dpy));
#endif
      }
      return res;
    }

    static int screen_height() {
      Display *const dpy = cimg::X11_attr().display;
      int res = 0;
      if (!dpy) {
        Display *const _dpy = XOpenDisplay(0);
        if (!_dpy)
          throw CImgIOException("CImgDisplay::screen_height() : Failed to open X11 display.");
        res = DisplayHeight(_dpy,DefaultScreen(_dpy));
        XCloseDisplay(_dpy);
      } else {
#ifdef cimg_use_xrandr
        if (cimg::X11_attr().resolutions && cimg::X11_attr().curr_resolution)
          res = cimg::X11_attr().resolutions[cimg::X11_attr().curr_resolution].height;
        else res = DisplayHeight(dpy,DefaultScreen(dpy));
#else
        res = DisplayHeight(dpy,DefaultScreen(dpy));
#endif
      }
      return res;
    }

    static void wait_all() {
      Display *const dpy = cimg::X11_attr().display;
      if (!dpy) return;
      XLockDisplay(dpy);
      bool flag = true;
      XEvent event;
      while (flag) {
        XNextEvent(dpy,&event);
        for (unsigned int i = 0; i<cimg::X11_attr().nb_wins; ++i)
          if (!cimg::X11_attr().wins[i]->_is_closed && event.xany.window==cimg::X11_attr().wins[i]->_window) {
            cimg::X11_attr().wins[i]->_handle_events(&event);
            if (cimg::X11_attr().wins[i]->_is_event) flag = false;
          }
      }
      XUnlockDisplay(dpy);
    }

    void _handle_events(const XEvent *const pevent) {
      Display *const dpy = cimg::X11_attr().display;
      XEvent event = *pevent;
      switch (event.type) {
      case ClientMessage : {
        if ((int)event.xclient.message_type==(int)_wm_protocol_atom &&
            (int)event.xclient.data.l[0]==(int)_wm_window_atom) {
          XUnmapWindow(cimg::X11_attr().display,_window);
          _is_closed = _is_event = true;
        }
      } break;
      case ConfigureNotify : {
        while (XCheckWindowEvent(dpy,_window,StructureNotifyMask,&event)) {}
        const unsigned int nw = event.xconfigure.width, nh = event.xconfigure.height;
        const int nx = event.xconfigure.x, ny = event.xconfigure.y;
        if (nw && nh && (nw!=_window_width || nh!=_window_height)) {
          _window_width = nw; _window_height = nh; _mouse_x = _mouse_y = -1;
          XResizeWindow(dpy,_window,_window_width,_window_height);
          _is_resized = _is_event = true;
        }
        if (nx!=_window_x || ny!=_window_y) { _window_x = nx; _window_y = ny; _is_moved = _is_event = true; }
      } break;
      case Expose : {
        while (XCheckWindowEvent(dpy,_window,ExposureMask,&event)) {}
        _paint(false);
        if (_is_fullscreen) {
          XWindowAttributes attr;
          XGetWindowAttributes(dpy,_window,&attr);
          while (attr.map_state!=IsViewable) XSync(dpy,False);
          XSetInputFocus(dpy,_window,RevertToParent,CurrentTime);
        }
      } break;
      case ButtonPress : {
        do {
          _mouse_x = event.xmotion.x; _mouse_y = event.xmotion.y;
          if (_mouse_x<0 || _mouse_y<0 || _mouse_x>=width() || _mouse_y>=height()) _mouse_x = _mouse_y = -1;
          switch (event.xbutton.button) {
          case 1 : set_button(1); break;
          case 3 : set_button(2); break;
          case 2 : set_button(3); break;
          }
        } while (XCheckWindowEvent(dpy,_window,ButtonPressMask,&event));
      } break;
      case ButtonRelease : {
        do {
          _mouse_x = event.xmotion.x; _mouse_y = event.xmotion.y;
          if (_mouse_x<0 || _mouse_y<0 || _mouse_x>=width() || _mouse_y>=height()) _mouse_x = _mouse_y = -1;
          switch (event.xbutton.button) {
          case 1 : set_button(1,false); break;
          case 3 : set_button(2,false); break;
          case 2 : set_button(3,false); break;
          case 4 : set_wheel(1); break;
          case 5 : set_wheel(-1); break;
          }
        } while (XCheckWindowEvent(dpy,_window,ButtonReleaseMask,&event));
      } break;
      case KeyPress : {
        char tmp = 0; KeySym ksym;
        XLookupString(&event.xkey,&tmp,1,&ksym,0);
        set_key((unsigned int)ksym,true);
      } break;
      case KeyRelease : {
        char tmp = 0; KeySym ksym;
        XLookupString(&event.xkey,&tmp,1,&ksym,0);
        set_key((unsigned int)ksym,false);
      } break;
      case EnterNotify: {
        while (XCheckWindowEvent(dpy,_window,EnterWindowMask,&event)) {}
        _mouse_x = event.xmotion.x;
        _mouse_y = event.xmotion.y;
        if (_mouse_x<0 || _mouse_y<0 || _mouse_x>=width() || _mouse_y>=height()) _mouse_x = _mouse_y = -1;
      } break;
      case LeaveNotify : {
        while (XCheckWindowEvent(dpy,_window,LeaveWindowMask,&event)) {}
        _mouse_x = _mouse_y =-1; _is_event = true;
      } break;
      case MotionNotify : {
        while (XCheckWindowEvent(dpy,_window,PointerMotionMask,&event)) {}
        _mouse_x = event.xmotion.x;
        _mouse_y = event.xmotion.y;
        if (_mouse_x<0 || _mouse_y<0 || _mouse_x>=width() || _mouse_y>=height()) _mouse_x = _mouse_y = -1;
        _is_event = true;
      } break;
      }
    }

    static void* _events_thread(void *) { // Only one thread to handle events for all opened display windows.
      Display *const dpy = cimg::X11_attr().display;
      XEvent event;
      pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED,0);
      pthread_setcancelstate(PTHREAD_CANCEL_ENABLE,0);
      for (;;) {
        XLockDisplay(dpy);
        bool event_flag = XCheckTypedEvent(dpy,ClientMessage,&event);
        if (!event_flag) event_flag = XCheckMaskEvent(dpy,
                                                      ExposureMask | StructureNotifyMask | ButtonPressMask|
                                                      KeyPressMask | PointerMotionMask | EnterWindowMask | LeaveWindowMask|
                                                      ButtonReleaseMask | KeyReleaseMask,&event);
        if (event_flag)
          for (unsigned int i = 0; i<cimg::X11_attr().nb_wins; ++i)
            if (!cimg::X11_attr().wins[i]->_is_closed && event.xany.window==cimg::X11_attr().wins[i]->_window)
              cimg::X11_attr().wins[i]->_handle_events(&event);
        XUnlockDisplay(dpy);
        pthread_testcancel();
        cimg::sleep(8);
      }
      return 0;
    }

    void _set_colormap(Colormap& colormap, const unsigned int dim) {
      XColor palette[256];
      switch (dim) {
      case 1 : { // palette for greyscale images
        for (unsigned int index = 0; index<256; ++index) {
          palette[index].pixel = index;
          palette[index].red = palette[index].green = palette[index].blue = (unsigned short)(index<<8);
          palette[index].flags = DoRed | DoGreen | DoBlue;
        }
      } break;
      case 2 : { // palette for RG images
        for (unsigned int index = 0, r = 8; r<256; r+=16)
          for (unsigned int g = 8; g<256; g+=16) {
            palette[index].pixel = index;
            palette[index].red = palette[index].blue = (unsigned short)(r<<8);
            palette[index].green = (unsigned short)(g<<8);
            palette[index++].flags = DoRed | DoGreen | DoBlue;
          }
      } break;
      default : { // palette for RGB images
        for (unsigned int index = 0, r = 16; r<256; r+=32)
          for (unsigned int g = 16; g<256; g+=32)
            for (unsigned int b = 32; b<256; b+=64) {
              palette[index].pixel = index;
              palette[index].red = (unsigned short)(r<<8);
              palette[index].green = (unsigned short)(g<<8);
              palette[index].blue = (unsigned short)(b<<8);
              palette[index++].flags = DoRed | DoGreen | DoBlue;
            }
      }
      }
      XStoreColors(cimg::X11_attr().display,colormap,palette,256);
    }

    void _map_window() {
      Display *const dpy = cimg::X11_attr().display;
      bool is_exposed = false, is_mapped = false;
      XWindowAttributes attr;
      XEvent event;
      XMapRaised(dpy,_window);
      do { // Wait for the window to be mapped.
        XWindowEvent(dpy,_window,StructureNotifyMask | ExposureMask,&event);
        switch (event.type) {
        case MapNotify : is_mapped = true; break;
        case Expose : is_exposed = true; break;
        }
      } while (!is_exposed || !is_mapped);
      do { // Wait for the window to be visible.
        XGetWindowAttributes(dpy,_window,&attr);
        if (attr.map_state!=IsViewable) { XSync(dpy,False); cimg::sleep(10); }
      } while (attr.map_state!=IsViewable);
      _window_x = attr.x;
      _window_y = attr.y;
    }

    void _paint(const bool wait_expose=true) {
      if (_is_closed || !_image) return;
      Display *const dpy = cimg::X11_attr().display;
      if (wait_expose) { // Send an expose event sticked to display window to force repaint.
        static XEvent event;
        event.xexpose.type = Expose;
        event.xexpose.serial = 0;
        event.xexpose.send_event = True;
        event.xexpose.display = dpy;
        event.xexpose.window = _window;
        event.xexpose.x = 0;
        event.xexpose.y = 0;
        event.xexpose.width = width();
        event.xexpose.height = height();
        event.xexpose.count = 0;
        XSendEvent(dpy,_window,False,0,&event);
      } else { // Repaint directly (may be called from the expose event).
        GC gc = DefaultGC(dpy,DefaultScreen(dpy));
#ifdef cimg_use_xshm
        if (_shminfo) XShmPutImage(dpy,_window,gc,_image,0,0,0,0,_width,_height,False);
        else XPutImage(dpy,_window,gc,_image,0,0,0,0,_width,_height);
#else
        XPutImage(dpy,_window,gc,_image,0,0,0,0,_width,_height);
#endif
      }
    }

    template<typename T>
    void _resize(T pixel_type, const unsigned int ndimx, const unsigned int ndimy, const bool force_redraw) {
      Display *const dpy = cimg::X11_attr().display;
      cimg::unused(pixel_type);

#ifdef cimg_use_xshm
      if (_shminfo) {
        XShmSegmentInfo *const nshminfo = new XShmSegmentInfo;
        XImage *const nimage = XShmCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),
                                               cimg::X11_attr().nb_bits,ZPixmap,0,nshminfo,ndimx,ndimy);
        if (!nimage) { delete nshminfo; return; }
        else {
          nshminfo->shmid = shmget(IPC_PRIVATE,ndimx*ndimy*sizeof(T),IPC_CREAT | 0777);
          if (nshminfo->shmid==-1) { XDestroyImage(nimage); delete nshminfo; return; }
          else {
            nshminfo->shmaddr = nimage->data = (char*)shmat(nshminfo->shmid,0,0);
            if (nshminfo->shmaddr==(char*)-1) { shmctl(nshminfo->shmid,IPC_RMID,0); XDestroyImage(nimage); delete nshminfo; return; }
            else {
              nshminfo->readOnly = False;
              cimg::X11_attr().is_shm_enabled = true;
              XErrorHandler oldXErrorHandler = XSetErrorHandler(_assign_xshm);
              XShmAttach(dpy,nshminfo);
              XFlush(dpy);
              XSetErrorHandler(oldXErrorHandler);
              if (!cimg::X11_attr().is_shm_enabled) {
                shmdt(nshminfo->shmaddr);
                shmctl(nshminfo->shmid,IPC_RMID,0);
                XDestroyImage(nimage);
                delete nshminfo;
                return;
              } else {
                T *const ndata = (T*)nimage->data;
                if (force_redraw) _render_resize((T*)_data,_width,_height,ndata,ndimx,ndimy);
                else std::memset(ndata,0,sizeof(T)*ndimx*ndimy);
                XShmDetach(dpy,_shminfo);
                XDestroyImage(_image);
                shmdt(_shminfo->shmaddr);
                shmctl(_shminfo->shmid,IPC_RMID,0);
                delete _shminfo;
                _shminfo = nshminfo;
                _image = nimage;
                _data = (void*)ndata;
              }
            }
          }
        }
      } else
#endif
        {
          T *ndata = (T*)std::malloc(ndimx*ndimy*sizeof(T));
          if (force_redraw) _render_resize((T*)_data,_width,_height,ndata,ndimx,ndimy);
          else std::memset(ndata,0,sizeof(T)*ndimx*ndimy);
          _data = (void*)ndata;
          XDestroyImage(_image);
          _image = XCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),
                                cimg::X11_attr().nb_bits,ZPixmap,0,(char*)_data,ndimx,ndimy,8,0);
        }
    }

    void _init_fullscreen() {
      if (!_is_fullscreen || _is_closed) return;
      Display *const dpy = cimg::X11_attr().display;
      _background_window = 0;

#ifdef cimg_use_xrandr
      int foo;
      if (XRRQueryExtension(dpy,&foo,&foo)) {
        XRRRotations(dpy,DefaultScreen(dpy),&cimg::X11_attr().curr_rotation);
        if (!cimg::X11_attr().resolutions) {
          cimg::X11_attr().resolutions = XRRSizes(dpy,DefaultScreen(dpy),&foo);
          cimg::X11_attr().nb_resolutions = (unsigned int)foo;
        }
        if (cimg::X11_attr().resolutions) {
          cimg::X11_attr().curr_resolution = 0;
          for (unsigned int i = 0; i<cimg::X11_attr().nb_resolutions; ++i) {
            const unsigned int
              nw = (unsigned int)(cimg::X11_attr().resolutions[i].width),
              nh = (unsigned int)(cimg::X11_attr().resolutions[i].height);
            if (nw>=_width && nh>=_height &&
                nw<=(unsigned int)(cimg::X11_attr().resolutions[cimg::X11_attr().curr_resolution].width) &&
                nh<=(unsigned int)(cimg::X11_attr().resolutions[cimg::X11_attr().curr_resolution].height))
              cimg::X11_attr().curr_resolution = i;
          }
          if (cimg::X11_attr().curr_resolution>0) {
            XRRScreenConfiguration *config = XRRGetScreenInfo(dpy,DefaultRootWindow(dpy));
            XRRSetScreenConfig(dpy,config,DefaultRootWindow(dpy),
                               cimg::X11_attr().curr_resolution,cimg::X11_attr().curr_rotation,CurrentTime);
            XRRFreeScreenConfigInfo(config);
            XSync(dpy,False);
          }
        }
      }
      if (!cimg::X11_attr().resolutions)
        cimg::warn(_cimgdisplay_instance
                   "init_fullscreen() : Xrandr extension not supported by the X server.",
                   cimgdisplay_instance);
#endif

      const unsigned int sx = screen_width(), sy = screen_height();
      if (sx==_width && sy==_height) return;
      XSetWindowAttributes winattr;
      winattr.override_redirect = True;
      _background_window = XCreateWindow(dpy,DefaultRootWindow(dpy),0,0,sx,sy,0,0,
                                         InputOutput,CopyFromParent,CWOverrideRedirect,&winattr);
      const unsigned int buf_size = sx*sy*(cimg::X11_attr().nb_bits==8?1:(cimg::X11_attr().nb_bits==16?2:4));
      void *background_data = std::malloc(buf_size);
      std::memset(background_data,0,buf_size);
      XImage *background_image = XCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),cimg::X11_attr().nb_bits,
                                              ZPixmap,0,(char*)background_data,sx,sy,8,0);
      XEvent event;
      XSelectInput(dpy,_background_window,StructureNotifyMask);
      XMapRaised(dpy,_background_window);
      do XWindowEvent(dpy,_background_window,StructureNotifyMask,&event);
      while (event.type!=MapNotify);
      GC gc = DefaultGC(dpy,DefaultScreen(dpy));
#ifdef cimg_use_xshm
      if (_shminfo) XShmPutImage(dpy,_background_window,gc,background_image,0,0,0,0,sx,sy,False);
      else XPutImage(dpy,_background_window,gc,background_image,0,0,0,0,sx,sy);
#else
      XPutImage(dpy,_background_window,gc,background_image,0,0,0,0,sx,sy);
#endif
      XWindowAttributes attr;
      XGetWindowAttributes(dpy,_background_window,&attr);
      while (attr.map_state!=IsViewable) XSync(dpy,False);
      XDestroyImage(background_image);
    }

    void _desinit_fullscreen() {
      if (!_is_fullscreen) return;
      Display *const dpy = cimg::X11_attr().display;
      XUngrabKeyboard(dpy,CurrentTime);
#ifdef cimg_use_xrandr
      if (cimg::X11_attr().resolutions && cimg::X11_attr().curr_resolution) {
        XRRScreenConfiguration *config = XRRGetScreenInfo(dpy,DefaultRootWindow(dpy));
        XRRSetScreenConfig(dpy,config,DefaultRootWindow(dpy),0,cimg::X11_attr().curr_rotation,CurrentTime);
        XRRFreeScreenConfigInfo(config);
        XSync(dpy,False);
        cimg::X11_attr().curr_resolution = 0;
      }
#endif
      if (_background_window) XDestroyWindow(dpy,_background_window);
      _background_window = 0;
      _is_fullscreen = false;
    }

    static int _assign_xshm(Display *dpy, XErrorEvent *error) {
      cimg::unused(dpy,error);
      cimg::X11_attr().is_shm_enabled = false;
      return 0;
    }

    void _assign(const unsigned int dimw, const unsigned int dimh, const char *const ptitle=0,
                 const unsigned int normalization_type=3,
                 const bool fullscreen_flag=false, const bool closed_flag=false) {

      // Allocate space for window title
      const char *const nptitle = ptitle?ptitle:"";
      const unsigned int s = std::strlen(nptitle) + 1;
      char *const tmp_title = s?new char[s]:0;
      if (s) std::memcpy(tmp_title,nptitle,s*sizeof(char));

      // Destroy previous display window if existing
      if (!is_empty()) assign();

      // Open X11 display and retrieve graphical properties.
      Display* &dpy = cimg::X11_attr().display;
      if (!dpy) {
        static const int xinit_status = XInitThreads();
        cimg::unused(xinit_status);
        dpy = XOpenDisplay(0);
        if (!dpy)
          throw CImgIOException(_cimgdisplay_instance
                                "assign() : Failed to open X11 display.",
                                cimgdisplay_instance);

        cimg::X11_attr().nb_bits = DefaultDepth(dpy,DefaultScreen(dpy));
        if (cimg::X11_attr().nb_bits!=8 && cimg::X11_attr().nb_bits!=16 && cimg::X11_attr().nb_bits!=24 && cimg::X11_attr().nb_bits!=32)
          throw CImgIOException(_cimgdisplay_instance
                                "assign() : Invalid %u bits screen mode detected "
                                "(only 8, 16, 24 and 32 bits modes are managed).",
                                cimgdisplay_instance,
                                cimg::X11_attr().nb_bits);
        XVisualInfo vtemplate;
        vtemplate.visualid = XVisualIDFromVisual(DefaultVisual(dpy,DefaultScreen(dpy)));
        int nb_visuals;
        XVisualInfo *vinfo = XGetVisualInfo(dpy,VisualIDMask,&vtemplate,&nb_visuals);
        if (vinfo && vinfo->red_mask<vinfo->blue_mask) cimg::X11_attr().is_blue_first = true;
        cimg::X11_attr().byte_order = ImageByteOrder(dpy);
        XFree(vinfo);

        XLockDisplay(dpy);
        cimg::X11_attr().event_thread = new pthread_t;
        pthread_create(cimg::X11_attr().event_thread,0,_events_thread,0);
      } else XLockDisplay(dpy);

      // Set display variables.
      _width = cimg::min(dimw,(unsigned int)screen_width());
      _height = cimg::min(dimh,(unsigned int)screen_height());
      _normalization = normalization_type<4?normalization_type:3;
      _is_fullscreen = fullscreen_flag;
      _window_x = _window_y = 0;
      _is_closed = closed_flag;
      _title = tmp_title;
      flush();

      // Create X11 window (and LUT, if 8bits display)
      if (_is_fullscreen) {
        if (!_is_closed) _init_fullscreen();
        const unsigned int sx = screen_width(), sy = screen_height();
        XSetWindowAttributes winattr;
        winattr.override_redirect = True;
        _window = XCreateWindow(dpy,DefaultRootWindow(dpy),(sx-_width)/2,(sy-_height)/2,_width,_height,0,0,
                                InputOutput,CopyFromParent,CWOverrideRedirect,&winattr);
      } else
        _window = XCreateSimpleWindow(dpy,DefaultRootWindow(dpy),0,0,_width,_height,0,0L,0L);

      XSelectInput(dpy,_window,
                   ExposureMask | StructureNotifyMask | ButtonPressMask | KeyPressMask | PointerMotionMask |
                   EnterWindowMask | LeaveWindowMask | ButtonReleaseMask | KeyReleaseMask);

      XStoreName(dpy,_window,_title?_title:" ");
      if (cimg::X11_attr().nb_bits==8) {
        _colormap = XCreateColormap(dpy,_window,DefaultVisual(dpy,DefaultScreen(dpy)),AllocAll);
        _set_colormap(_colormap,3);
        XSetWindowColormap(dpy,_window,_colormap);
      }

      static const char *const _window_class = cimg_display_classname;
      XClassHint *const window_class = XAllocClassHint();
      window_class->res_name = (char*)_window_class;
      window_class->res_class = (char*)_window_class;
      XSetClassHint(dpy,_window,window_class);
      XFree(window_class);

      _window_width = _width;
      _window_height = _height;

      // Create XImage
      const unsigned int buf_size = _width*_height*(cimg::X11_attr().nb_bits==8?1:(cimg::X11_attr().nb_bits==16?2:4));

#ifdef cimg_use_xshm
      _shminfo = 0;
      if (XShmQueryExtension(dpy)) {
        _shminfo = new XShmSegmentInfo;
        _image = XShmCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),cimg::X11_attr().nb_bits,ZPixmap,0,_shminfo,_width,_height);
        if (!_image) { delete _shminfo; _shminfo = 0; }
        else {
          _shminfo->shmid = shmget(IPC_PRIVATE, buf_size, IPC_CREAT | 0777);
          if (_shminfo->shmid==-1) { XDestroyImage(_image); delete _shminfo; _shminfo = 0; }
          else {
            _shminfo->shmaddr = _image->data = (char*)(_data = shmat(_shminfo->shmid,0,0));
            if (_shminfo->shmaddr==(char*)-1) { shmctl(_shminfo->shmid,IPC_RMID,0); XDestroyImage(_image); delete _shminfo; _shminfo = 0; }
            else {
              _shminfo->readOnly = False;
              cimg::X11_attr().is_shm_enabled = true;
              XErrorHandler oldXErrorHandler = XSetErrorHandler(_assign_xshm);
              XShmAttach(dpy,_shminfo);
              XSync(dpy,False);
              XSetErrorHandler(oldXErrorHandler);
              if (!cimg::X11_attr().is_shm_enabled) {
                shmdt(_shminfo->shmaddr); shmctl(_shminfo->shmid,IPC_RMID,0); XDestroyImage(_image); delete _shminfo; _shminfo = 0;
              }
            }
          }
        }
      }
      if (!_shminfo)
#endif
        {
          _data = std::malloc(buf_size);
          _image = XCreateImage(dpy,DefaultVisual(dpy,DefaultScreen(dpy)),cimg::X11_attr().nb_bits,ZPixmap,0,(char*)_data,_width,_height,8,0);
        }

      _wm_window_atom = XInternAtom(dpy,"WM_DELETE_WINDOW",False);
      _wm_protocol_atom = XInternAtom(dpy,"WM_PROTOCOLS",False);
      XSetWMProtocols(dpy,_window,&_wm_window_atom,1);

      if (_is_fullscreen) XGrabKeyboard(dpy,_window,True,GrabModeAsync,GrabModeAsync,CurrentTime);
      cimg::X11_attr().wins[cimg::X11_attr().nb_wins++]=this;
      if (!_is_closed) _map_window(); else { _window_x = _window_y = cimg::type<int>::min(); }
      XUnlockDisplay(dpy);
    }

    CImgDisplay& assign() {
      if (is_empty()) return flush();
      Display *const dpy = cimg::X11_attr().display;
      XLockDisplay(dpy);

      // Remove display window from event thread list.
      unsigned int i;
      for (i = 0; i<cimg::X11_attr().nb_wins && cimg::X11_attr().wins[i]!=this; ++i) {}
      for (; i<cimg::X11_attr().nb_wins-1; ++i) cimg::X11_attr().wins[i] = cimg::X11_attr().wins[i+1];
      --cimg::X11_attr().nb_wins;

      // Destroy window, image, colormap and title.
      if (_is_fullscreen && !_is_closed) _desinit_fullscreen();
      XDestroyWindow(dpy,_window);
      _window = 0;
#ifdef cimg_use_xshm
      if (_shminfo) {
        XShmDetach(dpy,_shminfo);
        XDestroyImage(_image);
        shmdt(_shminfo->shmaddr);
        shmctl(_shminfo->shmid,IPC_RMID,0);
        delete _shminfo;
        _shminfo = 0;
      } else
#endif
        XDestroyImage(_image);
      _data = 0; _image = 0;
      if (cimg::X11_attr().nb_bits==8) XFreeColormap(dpy,_colormap);
      _colormap = 0;
      XSync(dpy,False);

      // Reset display variables
      delete[] _title;
      _width = _height = _normalization = _window_width = _window_height = 0;
      _window_x = _window_y = 0;
      _is_fullscreen = false;
      _is_closed = true;
      _min = _max = 0;
      _title = 0;
      flush();

      // End event thread and close display if necessary
      XUnlockDisplay(dpy);
      if (!cimg::X11_attr().nb_wins) {
        // Kill event thread
        //pthread_cancel(*cimg::X11_attr().event_thread);
        //XUnlockDisplay(cimg::X11_attr().display);
        //pthread_join(*cimg::X11_attr().event_thread,0);
        //delete cimg::X11_attr().event_thread;
        //cimg::X11_attr().event_thread = 0;
        // XUnlockDisplay(cimg::X11_attr().display); // <- This call make the library hang sometimes (fix required).
        // XCloseDisplay(cimg::X11_attr().display); // <- This call make the library hang sometimes (fix required).
        //cimg::X11_attr().display = 0;
      }
      return *this;
    }

    CImgDisplay& assign(const unsigned int dimw, const unsigned int dimh, const char *const title=0,
                        const unsigned int normalization_type=3,
                        const bool fullscreen_flag=false, const bool closed_flag=false) {
      if (!dimw || !dimh) return assign();
      _assign(dimw,dimh,title,normalization_type,fullscreen_flag,closed_flag);
      _min = _max = 0;
      std::memset(_data,0,(cimg::X11_attr().nb_bits==8?sizeof(unsigned char):
                          (cimg::X11_attr().nb_bits==16?sizeof(unsigned short):sizeof(unsigned int)))*_width*_height);
      return paint();
    }

    template<typename T>
    CImgDisplay& assign(const CImg<T>& img, const char *const title=0,
                        const unsigned int normalization_type=3,
                        const bool fullscreen_flag=false, const bool closed_flag=false) {
      if (!img) return assign();
      CImg<T> tmp;
      const CImg<T>& nimg = (img._depth==1)?img:(tmp=img.get_projections2d(img._width/2,img._height/2,img._depth/2));
      _assign(nimg._width,nimg._height,title,normalization_type,fullscreen_flag,closed_flag);
      if (_normalization==2) _min = (float)nimg.min_max(_max);
      return render(nimg).paint();
    }

    template<typename T>
    CImgDisplay& assign(const CImgList<T>& list, const char *const title=0,
                        const unsigned int normalization_type=3,
                        const bool fullscreen_flag=false, const bool closed_flag=false) {
      if (!list) return assign();
      CImg<T> tmp;
      const CImg<T> img = list>'x', &nimg = (img._depth==1)?img:(tmp=img.get_projections2d(img._width/2,img._height/2,img._depth/2));
      _assign(nimg._width,nimg._height,title,normalization_type,fullscreen_flag,closed_flag);
      if (_normalization==2) _min = (float)nimg.min_max(_max);
      return render(nimg).paint();
    }

    CImgDisplay& assign(const CImgDisplay& disp) {
      if (!disp) return assign();
      _assign(disp._width,disp._height,disp._title,disp._normalization,disp._is_fullscreen,disp._is_closed);
      std::memcpy(_data,disp._data,(cimg::X11_attr().nb_bits==8?sizeof(unsigned char):
                                    cimg::X11_attr().nb_bits==16?sizeof(unsigned short):
                                    sizeof(unsigned int))*_width*_height);
      return paint();
    }

    CImgDisplay& resize(const int nwidth, const int nheight, const bool force_redraw=true) {
      if (!nwidth || !nheight || (is_empty() && (nwidth<0 || nheight<0))) return assign();
      if (is_empty()) return assign(nwidth,nheight);
      Display *const dpy = cimg::X11_attr().display;
      const unsigned int
        tmpdimx = (nwidth>0)?nwidth:(-nwidth*_width/100),
        tmpdimy = (nheight>0)?nheight:(-nheight*_height/100),
        dimx = tmpdimx?tmpdimx:1,
        dimy = tmpdimy?tmpdimy:1;
      XLockDisplay(dpy);
      if (_window_width!=dimx || _window_height!=dimy) XResizeWindow(dpy,_window,dimx,dimy);
      if (_width!=dimx || _height!=dimy) switch (cimg::X11_attr().nb_bits) {
        case 8 :  { unsigned char pixel_type = 0; _resize(pixel_type,dimx,dimy,force_redraw); } break;
        case 16 : { unsigned short pixel_type = 0; _resize(pixel_type,dimx,dimy,force_redraw); } break;
        default : { unsigned int pixel_type = 0; _resize(pixel_type,dimx,dimy,force_redraw); }
        }
      _window_width = _width = dimx; _window_height = _height = dimy;
      _is_resized = false;
      XUnlockDisplay(dpy);
      if (_is_fullscreen) move((screen_width()-_width)/2,(screen_height()-_height)/2);
      if (force_redraw) return paint();
      return *this;
    }

    CImgDisplay& toggle_fullscreen(const bool force_redraw=true) {
      if (is_empty()) return *this;
      if (force_redraw) {
        const unsigned int buf_size = _width*_height*(cimg::X11_attr().nb_bits==8?1:(cimg::X11_attr().nb_bits==16?2:4));
        void *image_data = std::malloc(buf_size);
        std::memcpy(image_data,_data,buf_size);
        assign(_width,_height,_title,_normalization,!_is_fullscreen,false);
        std::memcpy(_data,image_data,buf_size);
        std::free(image_data);
        return paint();
      }
      return assign(_width,_height,_title,_normalization,!_is_fullscreen,false);
    }

    CImgDisplay& show() {
      if (is_empty() || !_is_closed) return *this;
      Display *const dpy = cimg::X11_attr().display;
      XLockDisplay(dpy);
      if (_is_fullscreen) _init_fullscreen();
      _map_window();
      _is_closed = false;
      XUnlockDisplay(dpy);
      return paint();
    }

    CImgDisplay& close() {
      if (is_empty() || _is_closed) return *this;
      Display *const dpy = cimg::X11_attr().display;
      XLockDisplay(dpy);
      if (_is_fullscreen) _desinit_fullscreen();
      XUnmapWindow(dpy,_window);
      _window_x = _window_y = -1;
      _is_closed = true;
      XUnlockDisplay(dpy);
      return *this;
    }

    CImgDisplay& move(const int posx, const int posy) {
      if (is_empty()) return *this;
      Display *const dpy = cimg::X11_attr().display;
      show();
      XLockDisplay(dpy);
      XMoveWindow(dpy,_window,posx,posy);
      _window_x = posx; _window_y = posy;
      _is_moved = false;
      XUnlockDisplay(dpy);
      return paint();
    }

    CImgDisplay& show_mouse() {
      if (is_empty()) return *this;
      Display *const dpy = cimg::X11_attr().display;
      XLockDisplay(dpy);
      XUndefineCursor(dpy,_window);
      XUnlockDisplay(dpy);
      return *this;
    }

    CImgDisplay& hide_mouse() {
      if (is_empty()) return *this;
      Display *const dpy = cimg::X11_attr().display;
      XLockDisplay(dpy);
      const char pix_data[8] = { 0 };
      XColor col;
      col.red = col.green = col.blue = 0;
      Pixmap pix = XCreateBitmapFromData(dpy,_window,pix_data,8,8);
      Cursor cur = XCreatePixmapCursor(dpy,pix,pix,&col,&col,0,0);
      XFreePixmap(dpy,pix);
      XDefineCursor(dpy,_window,cur);
      XUnlockDisplay(dpy);
      return *this;
    }

    CImgDisplay& set_mouse(const int posx, const int posy) {
      if (is_empty() || _is_closed) return *this;
      Display *const dpy = cimg::X11_attr().display;
      XLockDisplay(dpy);
      XWarpPointer(dpy,0L,_window,0,0,0,0,posx,posy);
      _mouse_x = posx; _mouse_y = posy;
      _is_moved = false;
      XSync(dpy,False);
      XUnlockDisplay(dpy);
      return *this;
    }

    CImgDisplay& set_title(const char *const format, ...) {
      if (is_empty()) return *this;
      char tmp[1024] = { 0 };
      va_list ap;
      va_start(ap, format);
      cimg_vsnprintf(tmp,sizeof(tmp),format,ap);
      va_end(ap);
      if (!std::strcmp(_title,tmp)) return *this;
      delete[] _title;
      const unsigned int s = std::strlen(tmp) + 1;
      _title = new char[s];
      std::memcpy(_title,tmp,s*sizeof(char));
      Display *const dpy = cimg::X11_attr().display;
      XLockDisplay(dpy);
      XStoreName(dpy,_window,tmp);
      XUnlockDisplay(dpy);
      return *this;
    }

    template<typename T>
    CImgDisplay& display(const CImg<T>& img) {
      if (!img)
        throw CImgArgumentException(_cimgdisplay_instance
                                    "display() : Empty specified image.",
                                    cimgdisplay_instance);
      if (is_empty()) return assign(img);
      return render(img).paint(false);
    }

    CImgDisplay& paint(const bool wait_expose=true) {
      if (is_empty()) return *this;
      Display *const dpy = cimg::X11_attr().display;
      XLockDisplay(dpy);
      _paint(wait_expose);
      XUnlockDisplay(dpy);
      return *this;
    }

    template<typename T>
    CImgDisplay& render(const CImg<T>& img, const bool flag8=false) {
      if (!img)
        throw CImgArgumentException(_cimgdisplay_instance
                                    "render() : Empty specified image.",
                                    cimgdisplay_instance);
      if (is_empty()) return *this;
      if (img._depth!=1) return render(img.get_projections2d(img._width/2,img._height/2,img._depth/2));
      if (cimg::X11_attr().nb_bits==8 && (img._width!=_width || img._height!=_height)) return render(img.get_resize(_width,_height,1,-100,1));
      if (cimg::X11_attr().nb_bits==8 && !flag8 && img._spectrum==3) {
        static const CImg<typename CImg<T>::ucharT> default_palette = CImg<typename CImg<T>::ucharT>::default_LUT256();
        return render(img.get_index(default_palette,true,false));
      }

      Display *const dpy = cimg::X11_attr().display;
      const T
        *data1 = img._data,
        *data2 = (img._spectrum>1)?img.data(0,0,0,1):data1,
        *data3 = (img._spectrum>2)?img.data(0,0,0,2):data1;

      if (cimg::X11_attr().is_blue_first) cimg::swap(data1,data3);
      XLockDisplay(dpy);

      if (!_normalization || (_normalization==3 && cimg::type<T>::string()==cimg::type<unsigned char>::string())) {
        _min = _max = 0;
        switch (cimg::X11_attr().nb_bits) {
        case 8 : { // 256 color palette, no normalization
          _set_colormap(_colormap,img._spectrum);
          unsigned char *const ndata = (img._width==_width && img._height==_height)?(unsigned char*)_data:new unsigned char[img._width*img._height];
          unsigned char *ptrd = (unsigned char*)ndata;
          switch (img._spectrum) {
          case 1 : for (unsigned int xy = img._width*img._height; xy>0; --xy) (*ptrd++) = (unsigned char)*(data1++);
            break;
          case 2 : for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char R = (unsigned char)*(data1++), G = (unsigned char)*(data2++);
              (*ptrd++) = (R&0xf0) | (G>>4);
            } break;
          default : for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char R = (unsigned char)*(data1++), G = (unsigned char)*(data2++), B = (unsigned char)*(data3++);
              (*ptrd++) = (R&0xe0) | ((G>>5)<<2) | (B>>6);
            }
          }
          if (ndata!=_data) { _render_resize(ndata,img._width,img._height,(unsigned char*)_data,_width,_height); delete[] ndata; }
        } break;
        case 16 : { // 16 bits colors, no normalization
          unsigned short *const ndata = (img._width==_width && img._height==_height)?(unsigned short*)_data:new unsigned short[img._width*img._height];
          unsigned char *ptrd = (unsigned char*)ndata;
          const unsigned int M = 248;
          switch (img._spectrum) {
          case 1 :
            if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char val = (unsigned char)*(data1++), G = val>>2;
              *(ptrd++) = (val&M) | (G>>3);
              *(ptrd++) = (G<<5) | (G>>1);
            } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char val = (unsigned char)*(data1++), G = val>>2;
              *(ptrd++) = (G<<5) | (G>>1);
              *(ptrd++) = (val&M) | (G>>3);
            }
            break;
          case 2 :
            if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char G = (unsigned char)*(data2++)>>2;
              *(ptrd++) = ((unsigned char)*(data1++)&M) | (G>>3);
              *(ptrd++) = (G<<5);
            } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char G = (unsigned char)*(data2++)>>2;
              *(ptrd++) = (G<<5);
              *(ptrd++) = ((unsigned char)*(data1++)&M) | (G>>3);
            }
            break;
          default :
            if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char G = (unsigned char)*(data2++)>>2;
              *(ptrd++) = ((unsigned char)*(data1++)&M) | (G>>3);
              *(ptrd++) = (G<<5) | ((unsigned char)*(data3++)>>3);
            } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char G = (unsigned char)*(data2++)>>2;
              *(ptrd++) = (G<<5) | ((unsigned char)*(data3++)>>3);
              *(ptrd++) = ((unsigned char)*(data1++)&M) | (G>>3);
            }
          }
          if (ndata!=_data) { _render_resize(ndata,img._width,img._height,(unsigned short*)_data,_width,_height); delete[] ndata; }
        } break;
        default : { // 24 bits colors, no normalization
          unsigned int *const ndata = (img._width==_width && img._height==_height)?(unsigned int*)_data:new unsigned int[img._width*img._height];
          if (sizeof(int)==4) { // 32 bits int uses optimized version
            unsigned int *ptrd = ndata;
            switch (img._spectrum) {
            case 1 :
              if (cimg::X11_attr().byte_order==cimg::endianness())
                for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                  const unsigned char val = (unsigned char)*(data1++);
                  *(ptrd++) = (val<<16) | (val<<8) | val;
                }
              else
               for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                 const unsigned char val = (unsigned char)*(data1++);
                  *(ptrd++) = (val<<16) | (val<<8) | val;
                }
              break;
            case 2 :
              if (cimg::X11_attr().byte_order==cimg::endianness())
               for (unsigned int xy = img._width*img._height; xy>0; --xy)
                  *(ptrd++) = ((unsigned char)*(data1++)<<16) | ((unsigned char)*(data2++)<<8);
              else
               for (unsigned int xy = img._width*img._height; xy>0; --xy)
                  *(ptrd++) = ((unsigned char)*(data2++)<<16) | ((unsigned char)*(data1++)<<8);
              break;
            default :
              if (cimg::X11_attr().byte_order==cimg::endianness())
               for (unsigned int xy = img._width*img._height; xy>0; --xy)
                  *(ptrd++) = ((unsigned char)*(data1++)<<16) | ((unsigned char)*(data2++)<<8) | (unsigned char)*(data3++);
              else
               for (unsigned int xy = img._width*img._height; xy>0; --xy)
                  *(ptrd++) = ((unsigned char)*(data3++)<<24) | ((unsigned char)*(data2++)<<16) | ((unsigned char)*(data1++)<<8);
            }
          } else {
            unsigned char *ptrd = (unsigned char*)ndata;
            switch (img._spectrum) {
            case 1 :
              if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                *(ptrd++) = 0;
                *(ptrd++) = (unsigned char)*(data1++);
                *(ptrd++) = 0;
                *(ptrd++) = 0;
              } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                *(ptrd++) = 0;
                *(ptrd++) = 0;
                *(ptrd++) = (unsigned char)*(data1++);
                *(ptrd++) = 0;
              }
              break;
            case 2 :
              if (cimg::X11_attr().byte_order) cimg::swap(data1,data2);
              for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                *(ptrd++) = 0;
                *(ptrd++) = (unsigned char)*(data2++);
                *(ptrd++) = (unsigned char)*(data1++);
                *(ptrd++) = 0;
              }
              break;
            default :
              if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                *(ptrd++) = 0;
                *(ptrd++) = (unsigned char)*(data1++);
                *(ptrd++) = (unsigned char)*(data2++);
                *(ptrd++) = (unsigned char)*(data3++);
              } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                *(ptrd++) = (unsigned char)*(data3++);
                *(ptrd++) = (unsigned char)*(data2++);
                *(ptrd++) = (unsigned char)*(data1++);
                *(ptrd++) = 0;
              }
            }
          }
          if (ndata!=_data) { _render_resize(ndata,img._width,img._height,(unsigned int*)_data,_width,_height); delete[] ndata; }
        }
        }
      } else {
        if (_normalization==3) {
          if (cimg::type<T>::is_float()) _min = (float)img.min_max(_max);
          else { _min = (float)cimg::type<T>::min(); _max = (float)cimg::type<T>::max(); }
        } else if ((_min>_max) || _normalization==1) _min = (float)img.min_max(_max);
        const float delta = _max - _min, mm = 255/(delta?delta:1.0f);
        switch (cimg::X11_attr().nb_bits) {
        case 8 : { // 256 color palette, with normalization
          _set_colormap(_colormap,img._spectrum);
          unsigned char *const ndata = (img._width==_width && img._height==_height)?(unsigned char*)_data:new unsigned char[img._width*img._height];
          unsigned char *ptrd = (unsigned char*)ndata;
          switch (img._spectrum) {
          case 1 : for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char R = (unsigned char)((*(data1++)-_min)*mm);
              *(ptrd++) = R;
            } break;
          case 2 : for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char
                R = (unsigned char)((*(data1++)-_min)*mm),
                G = (unsigned char)((*(data2++)-_min)*mm);
            (*ptrd++) = (R&0xf0) | (G>>4);
          } break;
          default :
            for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char
                R = (unsigned char)((*(data1++)-_min)*mm),
                G = (unsigned char)((*(data2++)-_min)*mm),
                B = (unsigned char)((*(data3++)-_min)*mm);
              *(ptrd++) = (R&0xe0) | ((G>>5)<<2) | (B>>6);
            }
          }
          if (ndata!=_data) { _render_resize(ndata,img._width,img._height,(unsigned char*)_data,_width,_height); delete[] ndata; }
        } break;
        case 16 : { // 16 bits colors, with normalization
          unsigned short *const ndata = (img._width==_width && img._height==_height)?(unsigned short*)_data:new unsigned short[img._width*img._height];
          unsigned char *ptrd = (unsigned char*)ndata;
          const unsigned int M = 248;
          switch (img._spectrum) {
          case 1 :
            if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char val = (unsigned char)((*(data1++)-_min)*mm), G = val>>2;
              *(ptrd++) = (val&M) | (G>>3);
              *(ptrd++) = (G<<5) | (val>>3);
            } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char val = (unsigned char)((*(data1++)-_min)*mm), G = val>>2;
              *(ptrd++) = (G<<5) | (val>>3);
              *(ptrd++) = (val&M) | (G>>3);
            }
            break;
          case 2 :
            if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char G = (unsigned char)((*(data2++)-_min)*mm)>>2;
              *(ptrd++) = ((unsigned char)((*(data1++)-_min)*mm)&M) | (G>>3);
              *(ptrd++) = (G<<5);
            } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char G = (unsigned char)((*(data2++)-_min)*mm)>>2;
              *(ptrd++) = (G<<5);
              *(ptrd++) = ((unsigned char)((*(data1++)-_min)*mm)&M) | (G>>3);
            }
            break;
          default :
            if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char G = (unsigned char)((*(data2++)-_min)*mm)>>2;
              *(ptrd++) = ((unsigned char)((*(data1++)-_min)*mm)&M) | (G>>3);
              *(ptrd++) = (G<<5) | ((unsigned char)((*(data3++)-_min)*mm)>>3);
            } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
              const unsigned char G = (unsigned char)((*(data2++)-_min)*mm)>>2;
              *(ptrd++) = (G<<5) | ((unsigned char)((*(data3++)-_min)*mm)>>3);
              *(ptrd++) = ((unsigned char)((*(data1++)-_min)*mm)&M) | (G>>3);
            }
          }
          if (ndata!=_data) { _render_resize(ndata,img._width,img._height,(unsigned short*)_data,_width,_height); delete[] ndata; }
        } break;
        default : { // 24 bits colors, with normalization
          unsigned int *const ndata = (img._width==_width && img._height==_height)?(unsigned int*)_data:new unsigned int[img._width*img._height];
          if (sizeof(int)==4) { // 32 bits int uses optimized version
            unsigned int *ptrd = ndata;
            switch (img._spectrum) {
            case 1 :
              if (cimg::X11_attr().byte_order==cimg::endianness())
                for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                  const unsigned char val = (unsigned char)((*(data1++)-_min)*mm);
                  *(ptrd++) = (val<<16) | (val<<8) | val;
                }
              else
                for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                  const unsigned char val = (unsigned char)((*(data1++)-_min)*mm);
                  *(ptrd++) = (val<<24) | (val<<16) | (val<<8);
                }
              break;
            case 2 :
              if (cimg::X11_attr().byte_order==cimg::endianness())
                for (unsigned int xy = img._width*img._height; xy>0; --xy)
                  *(ptrd++) =
                    ((unsigned char)((*(data1++)-_min)*mm)<<16) |
                    ((unsigned char)((*(data2++)-_min)*mm)<<8);
              else
                for (unsigned int xy = img._width*img._height; xy>0; --xy)
                  *(ptrd++) =
                    ((unsigned char)((*(data2++)-_min)*mm)<<16) |
                    ((unsigned char)((*(data1++)-_min)*mm)<<8);
              break;
            default :
              if (cimg::X11_attr().byte_order==cimg::endianness())
                for (unsigned int xy = img._width*img._height; xy>0; --xy)
                  *(ptrd++) =
                    ((unsigned char)((*(data1++)-_min)*mm)<<16) |
                    ((unsigned char)((*(data2++)-_min)*mm)<<8) |
                    (unsigned char)((*(data3++)-_min)*mm);
              else
                for (unsigned int xy = img._width*img._height; xy>0; --xy)
                  *(ptrd++) =
                    ((unsigned char)((*(data3++)-_min)*mm)<<24) |
                    ((unsigned char)((*(data2++)-_min)*mm)<<16) |
                    ((unsigned char)((*(data1++)-_min)*mm)<<8);
            }
          } else {
            unsigned char *ptrd = (unsigned char*)ndata;
            switch (img._spectrum) {
            case 1 :
              if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                const unsigned char val = (unsigned char)((*(data1++)-_min)*mm);
                (*ptrd++) = 0;
                (*ptrd++) = val;
                (*ptrd++) = val;
                (*ptrd++) = val;
              } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                const unsigned char val = (unsigned char)((*(data1++)-_min)*mm);
                (*ptrd++) = val;
                (*ptrd++) = val;
                (*ptrd++) = val;
                (*ptrd++) = 0;
              }
              break;
            case 2 :
              if (cimg::X11_attr().byte_order) cimg::swap(data1,data2);
              for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                (*ptrd++) = 0;
                (*ptrd++) = (unsigned char)((*(data2++)-_min)*mm);
                (*ptrd++) = (unsigned char)((*(data1++)-_min)*mm);
                (*ptrd++) = 0;
              }
              break;
            default :
              if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                (*ptrd++) = 0;
                (*ptrd++) = (unsigned char)((*(data1++)-_min)*mm);
                (*ptrd++) = (unsigned char)((*(data2++)-_min)*mm);
                (*ptrd++) = (unsigned char)((*(data3++)-_min)*mm);
              } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
                (*ptrd++) = (unsigned char)((*(data3++)-_min)*mm);
                (*ptrd++) = (unsigned char)((*(data2++)-_min)*mm);
                (*ptrd++) = (unsigned char)((*(data1++)-_min)*mm);
                (*ptrd++) = 0;
              }
            }
          }
          if (ndata!=_data) { _render_resize(ndata,img._width,img._height,(unsigned int*)_data,_width,_height); delete[] ndata; }
        }
        }
      }
      XUnlockDisplay(dpy);
      return *this;
    }

    template<typename T>
    const CImgDisplay& snapshot(CImg<T>& img) const {
      if (is_empty()) { img.assign(); return *this; }
      const unsigned char *ptrs = (unsigned char*)_data;
      img.assign(_width,_height,1,3);
      T
        *data1 = img.data(0,0,0,0),
        *data2 = img.data(0,0,0,1),
        *data3 = img.data(0,0,0,2);
      if (cimg::X11_attr().is_blue_first) cimg::swap(data1,data3);
      switch (cimg::X11_attr().nb_bits) {
      case 8 : {
        for (unsigned int xy = img._width*img._height; xy>0; --xy) {
          const unsigned char val = *(ptrs++);
          *(data1++) = val&0xe0;
          *(data2++) = (val&0x1c)<<3;
          *(data3++) = val<<6;
        }
      } break;
      case 16 : {
        if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
          const unsigned char val0 = *(ptrs++), val1 = *(ptrs++);
          *(data1++) = val0&0xf8;
          *(data2++) = (val0<<5) | ((val1&0xe0)>>5);
          *(data3++) = val1<<3;
        } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
          const unsigned short val0 = *(ptrs++), val1 = *(ptrs++);
          *(data1++) = val1&0xf8;
          *(data2++) = (val1<<5) | ((val0&0xe0)>>5);
          *(data3++) = val0<<3;
        }
      } break;
      default : {
        if (cimg::X11_attr().byte_order) for (unsigned int xy = img._width*img._height; xy>0; --xy) {
          ++ptrs;
          *(data1++) = *(ptrs++);
          *(data2++) = *(ptrs++);
          *(data3++) = *(ptrs++);
        } else for (unsigned int xy = img._width*img._height; xy>0; --xy) {
          *(data3++) = *(ptrs++);
          *(data2++) = *(ptrs++);
          *(data1++) = *(ptrs++);
          ++ptrs;
        }
      }
      }
      return *this;
    }

    // Windows-based implementation.
    //-------------------------------
#elif cimg_display==2

    CLIENTCREATESTRUCT _ccs;
    BITMAPINFO _bmi;
    unsigned int *_data;
    DEVMODE _curr_mode;
    HWND _window;
    HWND _background_window;
    HDC _hdc;
    HANDLE _thread;
    HANDLE _is_created;
    HANDLE _mutex;
    bool _is_mouse_tracked;
    bool _is_cursor_visible;

    static int screen_width() {
      DEVMODE mode;
      mode.dmSize = sizeof(DEVMODE);
      mode.dmDriverExtra = 0;
      EnumDisplaySettings(0,ENUM_CURRENT_SETTINGS,&mode);
      return mode.dmPelsWidth;
    }

    static int screen_height() {
      DEVMODE mode;
      mode.dmSize = sizeof(DEVMODE);
      mode.dmDriverExtra = 0;
      EnumDisplaySettings(0,ENUM_CURRENT_SETTINGS,&mode);
      return mode.dmPelsHeight;
    }

    static void wait_all() {
      WaitForSingleObject(cimg::Win32_attr().wait_event,INFINITE);
    }

    static LRESULT APIENTRY _handle_events(HWND window,UINT msg,WPARAM wParam,LPARAM lParam) {
#ifdef _WIN64
      CImgDisplay *const disp = (CImgDisplay*)GetWindowLongPtr(window,GWLP_USERDATA);
#else
      CImgDisplay *const disp = (CImgDisplay*)GetWindowLong(window,GWL_USERDATA);
#endif
      MSG st_msg;
      switch (msg) {
      case WM_CLOSE :
        disp->_mouse_x = disp->_mouse_y = -1;
        disp->_window_x = disp->_window_y = 0;
        disp->set_button().set_key(0).set_key(0,false)._is_closed = true;
        ReleaseMutex(disp->_mutex);
        ShowWindow(disp->_window,SW_HIDE);
        disp->_is_event = true;
        SetEvent(cimg::Win32_attr().wait_event);
        return 0;
      case WM_SIZE : {
        while (PeekMessage(&st_msg,window,WM_SIZE,WM_SIZE,PM_REMOVE)) {}
        WaitForSingleObject(disp->_mutex,INFINITE);
        const unsigned int nw = LOWORD(lParam),nh = HIWORD(lParam);
        if (nw && nh && (nw!=disp->_width || nh!=disp->_height)) {
          disp->_window_width = nw;
          disp->_window_height = nh;
          disp->_mouse_x = disp->_mouse_y = -1;
          disp->_is_resized = disp->_is_event = true;
          SetEvent(cimg::Win32_attr().wait_event);
        }
        ReleaseMutex(disp->_mutex);
      } break;
      case WM_MOVE : {
        while (PeekMessage(&st_msg,window,WM_SIZE,WM_SIZE,PM_REMOVE)) {}
        WaitForSingleObject(disp->_mutex,INFINITE);
        const int nx = (int)(short)(LOWORD(lParam)), ny = (int)(short)(HIWORD(lParam));
        if (nx!=disp->_window_x || ny!=disp->_window_y) {
          disp->_window_x = nx;
          disp->_window_y = ny;
          disp->_is_moved = disp->_is_event = true;
          SetEvent(cimg::Win32_attr().wait_event);
        }
        ReleaseMutex(disp->_mutex);
      } break;
      case WM_PAINT :
        disp->paint();
        break;
      case WM_KEYDOWN :
        disp->set_key((unsigned int)wParam);
        SetEvent(cimg::Win32_attr().wait_event);
        break;
      case WM_KEYUP :
        disp->set_key((unsigned int)wParam,false);
        SetEvent(cimg::Win32_attr().wait_event);
        break;
      case WM_MOUSEMOVE : {
        while (PeekMessage(&st_msg,window,WM_MOUSEMOVE,WM_MOUSEMOVE,PM_REMOVE)) {}
        disp->_mouse_x = LOWORD(lParam);
        disp->_mouse_y = HIWORD(lParam);
#if (_WIN32_WINNT>=0x0400) && !defined(NOTRACKMOUSEEVENT)
        if (!disp->_is_mouse_tracked) {
          TRACKMOUSEEVENT tme;
          tme.cbSize = sizeof(TRACKMOUSEEVENT);
          tme.dwFlags = TME_LEAVE;
          tme.hwndTrack = disp->_window;
          if (TrackMouseEvent(&tme)) disp->_is_mouse_tracked = true;
        }
#endif
        if (disp->_mouse_x<0 || disp->_mouse_y<0 || disp->_mouse_x>=disp->width() || disp->_mouse_y>=disp->height())
          disp->_mouse_x = disp->_mouse_y = -1;
        disp->_is_event = true;
        SetEvent(cimg::Win32_attr().wait_event);
      } break;
      case WM_MOUSELEAVE : {
        disp->_mouse_x = disp->_mouse_y = -1;
        disp->_is_mouse_tracked = false;
      } break;
      case WM_LBUTTONDOWN :
        disp->set_button(1);
        SetEvent(cimg::Win32_attr().wait_event);
        break;
      case WM_RBUTTONDOWN :
        disp->set_button(2);
        SetEvent(cimg::Win32_attr().wait_event);
        break;
      case WM_MBUTTONDOWN :
        disp->set_button(3);
        SetEvent(cimg::Win32_attr().wait_event);
        break;
      case WM_LBUTTONUP :
        disp->set_button(1,false);
        SetEvent(cimg::Win32_attr().wait_event);
        break;
      case WM_RBUTTONUP :
        disp->set_button(2,false);
        SetEvent(cimg::Win32_attr().wait_event);
        break;
      case WM_MBUTTONUP :
        disp->set_button(3,false);
        SetEvent(cimg::Win32_attr().wait_event);
        break;
      case 0x020A : // WM_MOUSEWHEEL:
        disp->set_wheel((int)((short)HIWORD(wParam))/120);
        SetEvent(cimg::Win32_attr().wait_event);
      case WM_SETCURSOR :
        if (disp->_is_cursor_visible) ShowCursor(TRUE);
        else ShowCursor(FALSE);
        break;
      }
      return DefWindowProc(window,msg,wParam,lParam);
    }

    static DWORD WINAPI _events_thread(void* arg) {
      CImgDisplay *const disp = (CImgDisplay*)(((void**)arg)[0]);
      const char *const title = (const char*)(((void**)arg)[1]);
      MSG msg;
      delete[] (void**)arg;
      disp->_bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
      disp->_bmi.bmiHeader.biWidth = disp->width();
      disp->_bmi.bmiHeader.biHeight = -disp->height();
      disp->_bmi.bmiHeader.biPlanes = 1;
      disp->_bmi.bmiHeader.biBitCount = 32;
      disp->_bmi.bmiHeader.biCompression = BI_RGB;
      disp->_bmi.bmiHeader.biSizeImage = 0;
      disp->_bmi.bmiHeader.biXPelsPerMeter = 1;
      disp->_bmi.bmiHeader.biYPelsPerMeter = 1;
      disp->_bmi.bmiHeader.biClrUsed = 0;
      disp->_bmi.bmiHeader.biClrImportant = 0;
      disp->_data = new unsigned int[disp->_width*disp->_height];
      if (!disp->_is_fullscreen) { // Normal window
        RECT rect;
        rect.left = rect.top = 0; rect.right = disp->_width-1; rect.bottom = disp->_height-1;
        AdjustWindowRect(&rect,WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,false);
        const int
          border1 = (rect.right - rect.left + 1 - disp->_width)/2,
          border2 = rect.bottom - rect.top + 1 - disp->_height - border1;
        disp->_window = CreateWindowA("MDICLIENT",title?title:" ",
                                     WS_OVERLAPPEDWINDOW | (disp->_is_closed?0:WS_VISIBLE), CW_USEDEFAULT,CW_USEDEFAULT,
                                     disp->_width + 2*border1, disp->_height + border1 + border2,
                                     0,0,0,&(disp->_ccs));
        if (!disp->_is_closed) {
          GetWindowRect(disp->_window,&rect);
          disp->_window_x = rect.left + border1;
          disp->_window_y = rect.top + border2;
        } else disp->_window_x = disp->_window_y = 0;
      } else { // Fullscreen window
        const unsigned int sx = screen_width(), sy = screen_height();
        disp->_window = CreateWindowA("MDICLIENT",title?title:" ",
                                     WS_POPUP | (disp->_is_closed?0:WS_VISIBLE), (sx-disp->_width)/2, (sy-disp->_height)/2,
                                     disp->_width,disp->_height,0,0,0,&(disp->_ccs));
        disp->_window_x = disp->_window_y = 0;
      }
      SetForegroundWindow(disp->_window);
      disp->_hdc = GetDC(disp->_window);
      disp->_window_width = disp->_width;
      disp->_window_height = disp->_height;
      disp->flush();
#ifdef _WIN64
      SetWindowLongPtr(disp->_window,GWLP_USERDATA,(LONG_PTR)disp);
      SetWindowLongPtr(disp->_window,GWLP_WNDPROC,(LONG_PTR)_handle_events);
#else
      SetWindowLong(disp->_window,GWL_USERDATA,(LONG)disp);
      SetWindowLong(disp->_window,GWL_WNDPROC,(LONG)_handle_events);
#endif
      SetEvent(disp->_is_created);
      while (GetMessage(&msg,0,0,0)) DispatchMessage(&msg);
      return 0;
    }

    CImgDisplay& _update_window_pos() {
      if (_is_closed) _window_x = _window_y = -1;
      else {
        RECT rect;
        rect.left = rect.top = 0; rect.right = _width-1; rect.bottom = _height-1;
        AdjustWindowRect(&rect,WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,false);
        const int
          border1 = (rect.right - rect.left + 1 - _width)/2,
          border2 = rect.bottom - rect.top + 1 - _height - border1;
        GetWindowRect(_window,&rect);
        _window_x = rect.left + border1;
        _window_y = rect.top + border2;
      }
      return *this;
    }

    void _init_fullscreen() {
      _background_window = 0;
      if (!_is_fullscreen || _is_closed) _curr_mode.dmSize = 0;
      else {
        DEVMODE mode;
        unsigned int imode = 0, ibest = 0, bestbpp = 0, bw = ~0U, bh = ~0U;
        for (mode.dmSize = sizeof(DEVMODE), mode.dmDriverExtra = 0; EnumDisplaySettings(0,imode,&mode); ++imode) {
          const unsigned int nw = mode.dmPelsWidth, nh = mode.dmPelsHeight;
          if (nw>=_width && nh>=_height && mode.dmBitsPerPel>=bestbpp && nw<=bw && nh<=bh) {
            bestbpp = mode.dmBitsPerPel;
            ibest = imode;
            bw = nw; bh = nh;
          }
        }
        if (bestbpp) {
          _curr_mode.dmSize = sizeof(DEVMODE); _curr_mode.dmDriverExtra = 0;
          EnumDisplaySettings(0,ENUM_CURRENT_SETTINGS,&_curr_mode);
          EnumDisplaySettings(0,ibest,&mode);
          ChangeDisplaySettings(&mode,0);
        } else _curr_mode.dmSize = 0;

        const unsigned int sx = screen_width(), sy = screen_height();
        if (sx!=_width || sy!=_height) {
          CLIENTCREATESTRUCT background_ccs;
          _background_window = CreateWindowA("MDICLIENT","",WS_POPUP | WS_VISIBLE, 0,0,sx,sy,0,0,0,&background_ccs);
          SetForegroundWindow(_background_window);
        }
      }
    }

    void _desinit_fullscreen() {
      if (!_is_fullscreen) return;
      if (_background_window) DestroyWindow(_background_window);
      _background_window = 0;
      if (_curr_mode.dmSize) ChangeDisplaySettings(&_curr_mode,0);
      _is_fullscreen = false;
    }

    CImgDisplay& _assign(const unsigned int dimw, const unsigned int dimh, const char *const ptitle=0,
                         const unsigned int normalization_type=3,
                         const bool fullscreen_flag=false, const bool closed_flag=false) {

      // Allocate space for window title
      const char *const nptitle = ptitle?ptitle:"";
      const unsigned int s = std::strlen(nptitle) + 1;
      char *const tmp_title = s?new char[s]:0;
      if (s) std::memcpy(tmp_title,nptitle,s*sizeof(char));

      // Destroy previous window if existing
      if (!is_empty()) assign();

      // Set display variables
      _width = cimg::min(dimw,(unsigned int)screen_width());
      _height = cimg::min(dimh,(unsigned int)screen_height());
      _normalization = normalization_type<4?normalization_type:3;
      _is_fullscreen = fullscreen_flag;
      _window_x = _window_y = 0;
      _is_closed = closed_flag;
      _is_cursor_visible = true;
      _is_mouse_tracked = false;
      _title = tmp_title;
      flush();
      if (_is_fullscreen) _init_fullscreen();

      // Create event thread
      void *const arg = (void*)(new void*[2]);
      ((void**)arg)[0] = (void*)this;
      ((void**)arg)[1] = (void*)_title;
      unsigned long ThreadID = 0;
      _mutex = CreateMutex(0,FALSE,0);
      _is_created = CreateEvent(0,FALSE,FALSE,0);
      _thread = CreateThread(0,0,_events_thread,arg,0,&ThreadID);
      WaitForSingleObject(_is_created,INFINITE);
      return *this;
    }

    CImgDisplay& assign() {
      if (is_empty()) return flush();
      DestroyWindow(_window);
      TerminateThread(_thread,0);
      delete[] _data;
      delete[] _title;
      _data = 0;
      _title = 0;
      if (_is_fullscreen) _desinit_fullscreen();
      _width = _height = _normalization = _window_width = _window_height = 0;
      _window_x = _window_y = 0;
      _is_fullscreen = false;
      _is_closed = true;
      _min = _max = 0;
      _title = 0;
      flush();
      return *this;
    }

    CImgDisplay& assign(const unsigned int dimw, const unsigned int dimh, const char *const title=0,
                        const unsigned int normalization_type=3,
                        const bool fullscreen_flag=false, const bool closed_flag=false) {
      if (!dimw || !dimh) return assign();
      _assign(dimw,dimh,title,normalization_type,fullscreen_flag,closed_flag);
      _min = _max = 0;
      std::memset(_data,0,sizeof(unsigned int)*_width*_height);
      return paint();
    }

    template<typename T>
    CImgDisplay& assign(const CImg<T>& img, const char *const title=0,
                        const unsigned int normalization_type=3,
                        const bool fullscreen_flag=false, const bool closed_flag=false) {
      if (!img) return assign();
      CImg<T> tmp;
      const CImg<T>& nimg = (img._depth==1)?img:(tmp=img.get_projections2d(img._width/2,img._height/2,img._depth/2));
      _assign(nimg._width,nimg._height,title,normalization_type,fullscreen_flag,closed_flag);
      if (_normalization==2) _min = (float)nimg.min_max(_max);
      return display(nimg);
    }

    template<typename T>
    CImgDisplay& assign(const CImgList<T>& list, const char *const title=0,
                        const unsigned int normalization_type=3,
                        const bool fullscreen_flag=false, const bool closed_flag=false) {
      if (!list) return assign();
      CImg<T> tmp;
      const CImg<T> img = list>'x', &nimg = (img._depth==1)?img:(tmp=img.get_projections2d(img._width/2,img._height/2,img._depth/2));
      _assign(nimg._width,nimg._height,title,normalization_type,fullscreen_flag,closed_flag);
      if (_normalization==2) _min = (float)nimg.min_max(_max);
      return display(nimg);
    }

    CImgDisplay& assign(const CImgDisplay& disp) {
      if (!disp) return assign();
      _assign(disp._width,disp._height,disp._title,disp._normalization,disp._is_fullscreen,disp._is_closed);
      std::memcpy(_data,disp._data,sizeof(unsigned int)*_width*_height);
      return paint();
    }

    CImgDisplay& resize(const int nwidth, const int nheight, const bool force_redraw=true) {
      if (!nwidth || !nheight || (is_empty() && (nwidth<0 || nheight<0))) return assign();
      if (is_empty()) return assign(nwidth,nheight);
      const unsigned int
        tmpdimx = (nwidth>0)?nwidth:(-nwidth*_width/100),
        tmpdimy = (nheight>0)?nheight:(-nheight*_height/100),
        dimx = tmpdimx?tmpdimx:1,
        dimy = tmpdimy?tmpdimy:1;
      if (_window_width!=dimx || _window_height!=dimy) {
        RECT rect; rect.left = rect.top = 0; rect.right = dimx - 1; rect.bottom = dimy - 1;
        AdjustWindowRect(&rect,WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,false);
        const int cwidth = rect.right - rect.left + 1, cheight = rect.bottom - rect.top + 1;
        SetWindowPos(_window,0,0,0,cwidth,cheight,SWP_NOMOVE | SWP_NOZORDER | SWP_NOCOPYBITS);
      }
      if (_width!=dimx || _height!=dimy) {
        unsigned int *const ndata = new unsigned int[dimx*dimy];
        if (force_redraw) _render_resize(_data,_width,_height,ndata,dimx,dimy);
        else std::memset(ndata,0x80,sizeof(unsigned int)*dimx*dimy);
        delete[] _data;
        _data = ndata;
        _bmi.bmiHeader.biWidth = dimx;
        _bmi.bmiHeader.biHeight = -(int)dimy;
        _width = dimx;
        _height = dimy;
      }
      _window_width = dimx; _window_height = dimy;
      _is_resized = false;
      if (_is_fullscreen) move((screen_width()-_width)/2,(screen_height()-_height)/2);
      if (force_redraw) return paint();
      return *this;
    }

    CImgDisplay& toggle_fullscreen(const bool force_redraw=true) {
      if (is_empty()) return *this;
      if (force_redraw) {
        const unsigned int buf_size = _width*_height*4;
        void *odata = std::malloc(buf_size);
        std::memcpy(odata,_data,buf_size);
        assign(_width,_height,_title,_normalization,!_is_fullscreen,false);
        std::memcpy(_data,odata,buf_size);
        std::free(odata);
        return paint();
      }
      return assign(_width,_height,_title,_normalization,!_is_fullscreen,false);
    }

    CImgDisplay& show() {
      if (is_empty() || !_is_closed) return *this;
      _is_closed = false;
      if (_is_fullscreen) _init_fullscreen();
      ShowWindow(_window,SW_SHOW);
      _update_window_pos();
      return paint();
    }

    CImgDisplay& close() {
      if (is_empty() || _is_closed) return *this;
      _is_closed = true;
      if (_is_fullscreen) _desinit_fullscreen();
      ShowWindow(_window,SW_HIDE);
      _window_x = _window_y = 0;
      return *this;
    }

    CImgDisplay& move(const int posx, const int posy) {
      if (is_empty()) return *this;
      if (!_is_fullscreen) {
        RECT rect; rect.left = rect.top = 0; rect.right = _window_width-1; rect.bottom = _window_height-1;
        AdjustWindowRect(&rect,WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,false);
        const int border1 = (rect.right-rect.left+1-_width)/2, border2 = rect.bottom-rect.top+1-_height-border1;
        SetWindowPos(_window,0,posx-border1,posy-border2,0,0,SWP_NOSIZE | SWP_NOZORDER);
      } else SetWindowPos(_window,0,posx,posy,0,0,SWP_NOSIZE | SWP_NOZORDER);
      _window_x = posx;
      _window_y = posy;
      _is_moved = false;
      return show();
    }

    CImgDisplay& show_mouse() {
      if (is_empty()) return *this;
      _is_cursor_visible = true;
      ShowCursor(TRUE);
      SendMessage(_window,WM_SETCURSOR,0,0);
      return *this;
    }

    CImgDisplay& hide_mouse() {
      if (is_empty()) return *this;
      _is_cursor_visible = false;
      ShowCursor(FALSE);
      SendMessage(_window,WM_SETCURSOR,0,0);
      return *this;
    }

    CImgDisplay& set_mouse(const int posx, const int posy) {
      if (_is_closed || posx<0 || posy<0) return *this;
      _update_window_pos();
      const int res = (int)SetCursorPos(_window_x + posx,_window_y + posy);
      if (res) { _mouse_x = posx; _mouse_y = posy; }
      return *this;
    }

    CImgDisplay& set_title(const char *const format, ...) {
      if (is_empty()) return *this;
      char tmp[1024] = { 0 };
      va_list ap;
      va_start(ap, format);
      cimg_vsnprintf(tmp,sizeof(tmp),format,ap);
      va_end(ap);
      if (!std::strcmp(_title,tmp)) return *this;
      delete[] _title;
      const unsigned int s = std::strlen(tmp) + 1;
      _title = new char[s];
      std::memcpy(_title,tmp,s*sizeof(char));
      SetWindowTextA(_window, tmp);
      return *this;
    }

    template<typename T>
    CImgDisplay& display(const CImg<T>& img) {
      if (!img)
        throw CImgArgumentException(_cimgdisplay_instance
                                    "display() : Empty specified image.",
                                    cimgdisplay_instance);
      if (is_empty()) return assign(img);
      return render(img).paint();
    }

    CImgDisplay& paint() {
      if (_is_closed) return *this;
      WaitForSingleObject(_mutex,INFINITE);
      SetDIBitsToDevice(_hdc,0,0,_width,_height,0,0,0,_height,_data,&_bmi,DIB_RGB_COLORS);
      ReleaseMutex(_mutex);
      return *this;
    }

    template<typename T>
    CImgDisplay& render(const CImg<T>& img) {
      if (!img)
        throw CImgArgumentException(_cimgdisplay_instance
                                    "render() : Empty specified image.",
                                    cimgdisplay_instance);

      if (is_empty()) return *this;
      if (img._depth!=1) return render(img.get_projections2d(img._width/2,img._height/2,img._depth/2));

      const T
        *data1 = img._data,
        *data2 = (img._spectrum>=2)?img.data(0,0,0,1):data1,
        *data3 = (img._spectrum>=3)?img.data(0,0,0,2):data1;

      WaitForSingleObject(_mutex,INFINITE);
      unsigned int
        *const ndata = (img._width==_width && img._height==_height)?_data:new unsigned int[img._width*img._height],
        *ptrd = ndata;

      if (!_normalization || (_normalization==3 && cimg::type<T>::string()==cimg::type<unsigned char>::string())) {
        _min = _max = 0;
        switch (img._spectrum) {
        case 1 : {
          for (unsigned int xy = img._width*img._height; xy>0; --xy) {
            const unsigned char val = (unsigned char)*(data1++);
            *(ptrd++) = (val<<16) | (val<<8) | val;
          }
        } break;
        case 2 : {
          for (unsigned int xy = img._width*img._height; xy>0; --xy)
            *(ptrd++) = ((unsigned char)*(data1++)<<16) | ((unsigned char)*(data2++)<<8);
        } break;
        default : {
          for (unsigned int xy = img._width*img._height; xy>0; --xy)
            *(ptrd++) = ((unsigned char)*(data1++)<<16) | ((unsigned char)*(data2++)<<8) | (unsigned char)*(data3++);
        }
        }
      } else {
        if (_normalization==3) {
          if (cimg::type<T>::is_float()) _min = (float)img.min_max(_max);
          else { _min = (float)cimg::type<T>::min(); _max = (float)cimg::type<T>::max(); }
        } else if ((_min>_max) || _normalization==1) _min = (float)img.min_max(_max);
        const float delta = _max - _min, mm = 255/(delta?delta:1.0f);
        switch (img._spectrum) {
        case 1 : {
          for (unsigned int xy = img._width*img._height; xy>0; --xy) {
            const unsigned char val = (unsigned char)((*(data1++)-_min)*mm);
            *(ptrd++) = (val<<16) | (val<<8) | val;
          }
        } break;
        case 2 : {
          for (unsigned int xy = img._width*img._height; xy>0; --xy) {
            const unsigned char
              R = (unsigned char)((*(data1++)-_min)*mm),
              G = (unsigned char)((*(data2++)-_min)*mm);
            *(ptrd++) = (R<<16) | (G<<8);
          }
        } break;
        default : {
          for (unsigned int xy = img._width*img._height; xy>0; --xy) {
            const unsigned char
              R = (unsigned char)((*(data1++)-_min)*mm),
              G = (unsigned char)((*(data2++)-_min)*mm),
              B = (unsigned char)((*(data3++)-_min)*mm);
            *(ptrd++) = (R<<16) | (G<<8) | B;
          }
        }
        }
      }
      if (ndata!=_data) { _render_resize(ndata,img._width,img._height,_data,_width,_height); delete[] ndata; }
      ReleaseMutex(_mutex);
      return *this;
    }

    template<typename T>
    const CImgDisplay& snapshot(CImg<T>& img) const {
      if (is_empty()) { img.assign(); return *this; }
      const unsigned int *ptrs = _data;
      img.assign(_width,_height,1,3);
      T
        *data1 = img.data(0,0,0,0),
        *data2 = img.data(0,0,0,1),
        *data3 = img.data(0,0,0,2);
      for (unsigned int xy = img._width*img._height; xy>0; --xy) {
        const unsigned int val = *(ptrs++);
        *(data1++) = (unsigned char)(val>>16);
        *(data2++) = (unsigned char)((val>>8)&0xFF);
        *(data3++) = (unsigned char)(val&0xFF);
      }
      return *this;
    }
#endif

    //@}
  };

  /*
   #--------------------------------------
   #
   #
   #
   # Definition of the CImg<T> structure
   #
   #
   #
   #--------------------------------------
   */

  //! Class representing an image (up to 4 dimensions wide), each pixel being of type \c T.
  /**
     This is the main class of the %CImg Library. It declares and constructs
     an image, allows access to its pixel values, and is able to perform various image operations.

     \par Image representation

     A %CImg image is defined as an instance of the container \ref CImg<\c T>, which contains a regular grid of pixels,
     each pixel value being of type \c T. The image grid can have up to 4 dimensions : width, height, depth
     and number of channels.
     Usually, the three first dimensions are used to describe spatial coordinates <tt>(x,y,z)</tt>, while the number of channels
     is rather used as a vector-valued dimension (it may describe the R,G,B color channels for instance).
     If you need a fifth dimension, you can use image lists \ref CImgList<\c T> rather than simple images \ref CImg<\c T>.

     Thus, the \ref CImg<\c T> class is able to represent volumetric images of vector-valued pixels,
     as well as images with less dimensions (1d scalar signal, 2d color images, ...).
     Most member functions of the class CImg<\c T> are designed to handle this maximum case of (3+1) dimensions.

     Concerning the pixel value type \c T :
     fully supported template types are the basic C++ types : <tt>unsigned char, char, short, unsigned int, int,
     unsigned long, long, float, double, ... </tt>.
     Typically, fast image display can be done using <tt>CImg<unsigned char></tt> images,
     while complex image processing algorithms may be rather coded using <tt>CImg<float></tt> or <tt>CImg<double></tt>
     images that have floating-point pixel values. The default value for the template T is \c float.
     Using your own template types may be possible. However, you will certainly have to define the complete set
     of arithmetic and logical operators for your class.

     \par Image structure

     The \ref CImg<\c T> structure contains \a six fields :
     - \ref width defines the number of \a columns of the image (size along the X-axis).
     - \ref height defines the number of \a rows of the image (size along the Y-axis).
     - \ref depth defines the number of \a slices of the image (size along the Z-axis).
     - \ref spectrum defines the number of \a channels of the image (size along the C-axis).
     - \ref data defines a \a pointer to the \a pixel \a data (of type \c T).
     - \ref is_shared is a boolean that tells if the memory buffer \ref data is shared with
       another image.

     You can access these fields publicly although it is recommended to use the dedicated functions
     width(), height(), depth(), spectrum() and ptr() to do so.
     Image dimensions are not limited to a specific range (as long as you got enough available memory).
     A value of \e 1 usually means that the corresponding dimension is \a flat.
     If one of the dimensions is \e 0, or if the data pointer is null, the image is considered as \e empty.
     Empty images should not contain any pixel data and thus, will not be processed by CImg member functions
     (a CImgInstanceException will be thrown instead).
     Pixel data are stored in memory, in a non interlaced mode (See \ref cimg_storage).

     \par Image declaration and construction

     Declaring an image can be done by using one of the several available constructors.
     Here is a list of the most used :

     - Construct images from arbitrary dimensions :
         - <tt>CImg<char> img;</tt> declares an empty image.
         - <tt>CImg<unsigned char> img(128,128);</tt> declares a 128x128 greyscale image with
         \c unsigned \c char pixel values.
         - <tt>CImg<double> img(3,3);</tt> declares a 3x3 matrix with \c double coefficients.
         - <tt>CImg<unsigned char> img(256,256,1,3);</tt> declares a 256x256x1x3 (color) image
         (colors are stored as an image with three channels).
         - <tt>CImg<double> img(128,128,128);</tt> declares a 128x128x128 volumetric and greyscale image
         (with \c double pixel values).
         - <tt>CImg<> img(128,128,128,3);</tt> declares a 128x128x128 volumetric color image
         (with \c float pixels, which is the default value of the template parameter \c T).
         - \b Note : images pixels are <b>not automatically initialized to 0</b>. You may use the function \ref fill() to
         do it, or use the specific constructor taking 5 parameters like this :
         <tt>CImg<> img(128,128,128,3,0);</tt> declares a 128x128x128 volumetric color image with all pixel values to 0.

     - Construct images from filenames :
         - <tt>CImg<unsigned char> img("image.jpg");</tt> reads a JPEG color image from the file "image.jpg".
         - <tt>CImg<float> img("analyze.hdr");</tt> reads a volumetric image (ANALYZE7.5 format) from the file "analyze.hdr".
         - \b Note : You need to install <a href="http://www.imagemagick.org">ImageMagick</a>
         to be able to read common compressed image formats (JPG,PNG, ...) (See \ref cimg_files_io).

     - Construct images from C-style arrays :
         - <tt>CImg<int> img(data_buffer,256,256);</tt> constructs a 256x256 greyscale image from a \c int* buffer
         \c data_buffer (of size 256x256=65536).
         - <tt>CImg<unsigned char> img(data_buffer,256,256,1,3,false);</tt> constructs a 256x256 color image
         from a \c unsigned \c char* buffer \c data_buffer (where R,G,B channels follow each others).
         - <tt>CImg<unsigned char> img(data_buffer,256,256,1,3,true);</tt> constructs a 256x256 color image
         from a \c unsigned \c char* buffer \c data_buffer (where R,G,B channels are multiplexed).

         The complete list of constructors can be found <a href="#constructors">here</a>.

     \par Most useful functions

     The \ref CImg<\c T> class contains a lot of functions that operates on images.
     Some of the most useful are :

     - operator()() : allows to access or write pixel values.
     - display() : displays the image in a new window.
  **/
  template<typename T>
  struct CImg {

    //! Variable representing the width of the instance image (i.e. dimensions along the X-axis).
    /**
       \remark
       - Prefer using the function CImg<T>::width() to get information about the width of an image.
       - Use function CImg<T>::resize() to set a new width for an image. Setting directly the variable \c width would probably
       result in a library crash.
       - Empty images have \c width defined to \c 0.
    **/
    unsigned int _width;

    //! Variable representing the height of the instance image (i.e. dimensions along the Y-axis).
    /**
       \remark
       - Prefer using the function CImg<T>::height() to get information about the height of an image.
       - Use function CImg<T>::resize() to set a new height for an image. Setting directly the variable \c height would probably
       result in a library crash.
       - 1d signals have \c height defined to \c 1.
       - Empty images have \c height defined to \c 0.
    **/
    unsigned int _height;

    //! Variable representing the depth of the instance image (i.e. dimensions along the Z-axis).
    /**
       \remark
       - Prefer using the function CImg<T>::depth() to get information about the depth of an image.
       - Use function CImg<T>::resize() to set a new depth for an image. Setting directly the variable \c depth would probably
       result in a library crash.
       - Classical 2d images have \c depth defined to \c 1.
       - Empty images have \c depth defined to \c 0.
    **/
    unsigned int _depth;

    //! Variable representing the number of channels of the instance image (i.e. dimensions along the C-axis).
    /**
       \remark
       - Prefer using the function CImg<T>::spectrum() to get information about the depth of an image.
       - Use function CImg<T>::resize() to set a new vector dimension for an image. Setting directly the variable \c spectrum would probably
       result in a library crash.
       - Scalar-valued images (one value per pixel) have \c spectrum defined to \c 1.
       - Empty images have \c depth defined to \c 0.
    **/
    unsigned int _spectrum;

    //! Variable telling if pixel buffer of the instance image is shared with another one.
    bool _is_shared;

    //! Pointer to the first pixel of the pixel buffer.
    T *_data;

    //! Iterator type for CImg<T>.
    /**
       \remark
       - An \p iterator is a <tt>T*</tt> pointer (address of a pixel value in the pixel buffer).
       - Iterators are not directly used in %CImg functions, they have been introduced for compatibility with the STL.
    **/
    typedef T* iterator;

    //! Const iterator type for CImg<T>.
    /**
       \remark
       - A \p const_iterator is a <tt>const T*</tt> pointer (address of a pixel value in the pixel buffer).
       - Iterators are not directly used in %CImg functions, they have been introduced for compatibility with the STL.
    **/
    typedef const T* const_iterator;

    //! Value type.
    typedef T value_type;

    // Define common T-dependant types.
    typedef typename cimg::superset<T,bool>::type Tbool;
    typedef typename cimg::superset<T,unsigned char>::type Tuchar;
    typedef typename cimg::superset<T,char>::type Tchar;
    typedef typename cimg::superset<T,unsigned short>::type Tushort;
    typedef typename cimg::superset<T,short>::type Tshort;
    typedef typename cimg::superset<T,unsigned int>::type Tuint;
    typedef typename cimg::superset<T,int>::type Tint;
    typedef typename cimg::superset<T,unsigned long>::type Tulong;
    typedef typename cimg::superset<T,long>::type Tlong;
    typedef typename cimg::superset<T,float>::type Tfloat;
    typedef typename cimg::superset<T,double>::type Tdouble;
    typedef typename cimg::last<T,bool>::type boolT;
    typedef typename cimg::last<T,unsigned char>::type ucharT;
    typedef typename cimg::last<T,char>::type charT;
    typedef typename cimg::last<T,unsigned short>::type ushortT;
    typedef typename cimg::last<T,short>::type shortT;
    typedef typename cimg::last<T,unsigned int>::type uintT;
    typedef typename cimg::last<T,int>::type intT;
    typedef typename cimg::last<T,unsigned long>::type ulongT;
    typedef typename cimg::last<T,long>::type longT;
    typedef typename cimg::last<T,float>::type floatT;
    typedef typename cimg::last<T,double>::type doubleT;

    //@}
    //---------------------------
    //
    //! \name Plugins
    //@{
    //---------------------------
#ifdef cimg_plugin
#include cimg_plugin
#endif
#ifdef cimg_plugin1
#include cimg_plugin1
#endif
#ifdef cimg_plugin2
#include cimg_plugin2
#endif
#ifdef cimg_plugin3
#include cimg_plugin3
#endif
#ifdef cimg_plugin4
#include cimg_plugin4
#endif
#ifdef cimg_plugin5
#include cimg_plugin5
#endif
#ifdef cimg_plugin6
#include cimg_plugin6
#endif
#ifdef cimg_plugin7
#include cimg_plugin7
#endif
#ifdef cimg_plugin8
#include cimg_plugin8
#endif

    //@}
    //---------------------------------------------------------
    //
    //! \name Constructors / Destructor / Instance Management
    //@{
    //---------------------------------------------------------

    //! Destructor.
    /**
       The destructor destroys the instance image.
       \remark
       - Destructing an empty or shared image does nothing.
       - Otherwise, all memory used to store the pixel data of the instance image is freed.
       - When destroying a non-shared image, be sure that every shared instances of the same image are
       also destroyed to avoid further access to desallocated memory buffers.
    **/
    ~CImg() {
      if (!_is_shared) delete[] _data;
    }

    //! Default constructor.
    /**
       The default constructor creates an empty instance image.
       \remark
       - An empty image does not contain any data and has all of its dimensions \ref width, \ref height, \ref depth, \ref spectrum
       set to 0 as well as its pointer to the pixel buffer \ref data.
       - An empty image is non-shared.
    **/
    CImg():_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {}

    //! Constructs a new image with given size (\p dx,\p dy,\p dz,\p dc).
    /**
       This constructors create an instance image of size (\p dx,\p dy,\p dz,\p dc) with pixels of type \p T.
       \param dx Desired size along the X-axis, i.e. the \ref width of the image.
       \param dy Desired size along the Y-axis, i.e. the \ref height of the image.
       \param dz Desired size along the Z-axis, i.e. the \ref depth of the image.
       \param dc Desired size along the C-axis, i.e. the number of image channels \ref spectrum.
       \remark
       - If one of the input dimension \p dx,\p dy,\p dz or \p dc is set to 0, the created image is empty
       and all has its dimensions set to 0. No memory for pixel data is then allocated.
       - This constructor creates only non-shared images.
       - Image pixels allocated by this constructor are \b not \b initialized.
       Use the constructor CImg(const unsigned int,const unsigned int,const unsigned int,const unsigned int,const T)
       to get an image of desired size with pixels set to a particular value.
    **/
    explicit CImg(const unsigned int dx, const unsigned int dy=1, const unsigned int dz=1, const unsigned int dc=1):
      _is_shared(false) {
      const unsigned int siz = dx*dy*dz*dc;
      if (siz) {
        _width = dx; _height = dy; _depth = dz; _spectrum = dc;
        try { _data = new T[siz]; } catch (...) {
          _width = _height = _depth = _spectrum = 0; _data = 0;
          throw CImgInstanceException(_cimg_instance
                                      "CImg() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                      cimg_instance,
                                      cimg::strbuffersize(dx*dy*dz*dc*sizeof(T)),dx,dy,dz,dc);
        }
      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
    }

    //! Construct an image with given size (\p dx,\p dy,\p dz,\p dc) and with pixel having a default value \p val.
    /**
       This constructor creates an instance image of size (\p dx,\p dy,\p dz,\p dc) with pixels of type \p T and sets all pixel
       values of the created instance image to \p val.
       \param dx Desired size along the X-axis, i.e. the \ref width of the image.
       \param dy Desired size along the Y-axis, i.e. the \ref height of the image.
       \param dz Desired size along the Z-axis, i.e. the \ref depth of the image.
       \param dc Desired size along the C-axis, i.e. the number of image channels \p spectrum.
       \param val Default value for image pixels.
       \remark
       - This constructor has the same properties as CImg(const unsigned int,const unsigned int,const unsigned int,const unsigned int).
    **/
    CImg(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc, const T val):
      _is_shared(false) {
      const unsigned int siz = dx*dy*dz*dc;
      if (siz) {
        _width = dx; _height = dy; _depth = dz; _spectrum = dc;
        try { _data = new T[siz]; } catch (...) {
          _width = _height = _depth = _spectrum = 0; _data = 0;
          throw CImgInstanceException(_cimg_instance
                                      "CImg() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                      cimg_instance,
                                      cimg::strbuffersize(dx*dy*dz*dc*sizeof(T)),dx,dy,dz,dc);
        }
        fill(val);
      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
    }

    //! Construct an image with given size (\p dx,\p dy,\p dz,\p dc) and with specified pixel values (int version).
    CImg(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc,
         const int val0, const int val1, ...):_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
#define _CImg_stdarg(img,a0,a1,N,t) { \
        unsigned int _siz = (unsigned int)N; \
        if (_siz--) { \
          va_list ap; \
          va_start(ap,a1); \
          T *ptrd = (img)._data; \
          *(ptrd++) = (T)a0; \
          if (_siz--) { \
            *(ptrd++) = (T)a1; \
            for (; _siz; --_siz) *(ptrd++) = (T)va_arg(ap,t); \
          } \
          va_end(ap); \
        } \
      }
      assign(dx,dy,dz,dc);
      _CImg_stdarg(*this,val0,val1,dx*dy*dz*dc,int);
    }

    //! Construct an image with given size (\p dx,\p dy,\p dz,\p dc) and with specified pixel values (double version).
    CImg(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc,
         const double val0, const double val1, ...):_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
      assign(dx,dy,dz,dc);
      _CImg_stdarg(*this,val0,val1,dx*dy*dz*dc,double);
    }

    //! Construct an image with given size and with specified values given in a string.
    CImg(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc,
         const char *const values, const bool repeat_values):_is_shared(false) {
      const unsigned int siz = dx*dy*dz*dc;
      if (siz) {
        _width = dx; _height = dy; _depth = dz; _spectrum = dc;
        try { _data = new T[siz]; } catch (...) {
          _width = _height = _depth = _spectrum = 0; _data = 0;
          throw CImgInstanceException(_cimg_instance
                                      "CImg() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                      cimg_instance,
                                      cimg::strbuffersize(dx*dy*dz*dc*sizeof(T)),dx,dy,dz,dc);
        }
        fill(values,repeat_values);
      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
    }

    //! Construct an image from a raw memory buffer.
    /**
       This constructor creates an instance image of size (\p dx,\p dy,\p dz,\p dc) and fill its pixel buffer by
       copying data values from the input raw pixel buffer \p data_buffer.
    **/
    template<typename t>
    CImg(const t *const data_buffer, const unsigned int dx, const unsigned int dy=1,
         const unsigned int dz=1, const unsigned int dc=1, const bool shared=false):_is_shared(false) {
      if (shared) {
        _width = _height = _depth = _spectrum = 0; _data = 0;
        throw CImgArgumentException(_cimg_instance
                                    "CImg() : Invalid construction request of a (%u,%u,%u,%u) shared instance from a (%s*) buffer "
                                    "(pixel types are different).",
                                    cimg_instance,
                                    dx,dy,dz,dc,CImg<t>::pixel_type());
      }
      const unsigned int siz = dx*dy*dz*dc;
      if (data_buffer && siz) {
        _width = dx; _height = dy; _depth = dz; _spectrum = dc;
        try { _data = new T[siz]; } catch (...) {
          _width = _height = _depth = _spectrum = 0; _data = 0;
          throw CImgInstanceException(_cimg_instance
                                      "CImg() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                      cimg_instance,
                                      cimg::strbuffersize(dx*dy*dz*dc*sizeof(T)),dx,dy,dz,dc);

        }
        const t *ptrs = data_buffer + siz; cimg_for(*this,ptrd,T) *ptrd = (T)*(--ptrs);
      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
    }

    CImg(const T *const data_buffer, const unsigned int dx, const unsigned int dy=1,
         const unsigned int dz=1, const unsigned int dc=1, const bool shared=false) {
      const unsigned int siz = dx*dy*dz*dc;
      if (data_buffer && siz) {
        _width = dx; _height = dy; _depth = dz; _spectrum = dc; _is_shared = shared;
        if (_is_shared) _data = const_cast<T*>(data_buffer);
        else {
          try { _data = new T[siz]; } catch (...) {
            _width = _height = _depth = _spectrum = 0; _data = 0;
            throw CImgInstanceException(_cimg_instance
                                        "CImg() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                        cimg_instance,
                                        cimg::strbuffersize(dx*dy*dz*dc*sizeof(T)),dx,dy,dz,dc);
          }
          std::memcpy(_data,data_buffer,siz*sizeof(T)); }
      } else { _width = _height = _depth = _spectrum = 0; _is_shared = false; _data = 0; }
    }

    //! Construct an image from an image file.
    /**
       This constructor creates an instance image by reading it from a file.
       \param filename Filename of the image file.
       \remark
       - The image format is deduced from the filename only by looking for the filename extension i.e. without
       analyzing the file itself.
       - Recognized image formats depend on the tools installed on your system or the external libraries you use to link your code with.
       More informations on this topic can be found in cimg_files_io.
       - If the filename is not found, a CImgIOException is thrown by this constructor.
    **/
    explicit CImg(const char *const filename):_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
      assign(filename);
    }

    //! Default copy constructor.
    /**
       The default copy constructor creates a new instance image having same dimensions
       (\ref width, \ref height, \ref depth, \ref _spectrum) and same pixel values as the input image \p img.
       \param img The input image to copy.
       \remark
       - If the input image \p img is non-shared or have a different template type \p t != \p T,
       the default copy constructor allocates a new pixel buffer and copy the pixel data
       of \p img into it. In this case, the pointers \ref data to the pixel buffers of the two images are different
       and the resulting instance image is non-shared.
       - If the input image \p img is shared and has the same template type \p t == \p T,
       the default copy constructor does not allocate a new pixel buffer and the resulting instance image
       shares its pixel buffer with the input image \p img, which means that modifying pixels of \p img also modifies
       the created instance image.
       - Copying an image having a different template type \p t != \p T performs a crude static cast conversion of each pixel value from
       type \p t to type \p T.
       - Copying an image having the same template type \p t == \p T is significantly faster.
    **/
    template<typename t>
    CImg(const CImg<t>& img):_is_shared(false) {
      const unsigned int siz = img.size();
      if (img._data && siz) {
        _width = img._width; _height = img._height; _depth = img._depth; _spectrum = img._spectrum;
        try { _data = new T[siz]; } catch (...) {
          _width = _height = _depth = _spectrum = 0; _data = 0;
          throw CImgInstanceException(_cimg_instance
                                      "CImg() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                      cimg_instance,
                                      cimg::strbuffersize(img._width*img._height*img._depth*img._spectrum*sizeof(T)),
                                      img._width,img._height,img._depth,img._spectrum);
        }
        const t *ptrs = img._data + siz; cimg_for(*this,ptrd,T) *ptrd = (T)*(--ptrs);
      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
    }

    CImg(const CImg<T>& img) {
      const unsigned int siz = img.size();
      if (img._data && siz) {
        _width = img._width; _height = img._height; _depth = img._depth; _spectrum = img._spectrum; _is_shared = img._is_shared;
        if (_is_shared) _data = const_cast<T*>(img._data);
        else {
          try { _data = new T[siz]; } catch (...) {
            _width = _height = _depth = _spectrum = 0; _data = 0;
            throw CImgInstanceException(_cimg_instance
                                        "CImg() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                        cimg_instance,
                                        cimg::strbuffersize(img._width*img._height*img._depth*img._spectrum*sizeof(T)),
                                        img._width,img._height,img._depth,img._spectrum);

          }
          std::memcpy(_data,img._data,siz*sizeof(T));
        }
      } else { _width = _height = _depth = _spectrum = 0; _is_shared = false; _data = 0; }
    }

    //! Advanced copy constructor.
    /**
       The advanced copy constructor - as the default constructor CImg(const CImg< t >&) - creates a new instance image having same dimensions
       \ref width, \ref height, \ref depth, \ref spectrum and same pixel values as the input image \p img.
       But it also decides if the created instance image shares its memory with the input image \p img (if the input parameter
       \p shared is set to \p true) or not (if the input parameter \p shared is set to \p false).
       \param img The input image to copy.
       \param shared Boolean flag that decides if the copy is shared on non-shared.
       \remark
       - It is not possible to create a shared copy if the input image \p img is empty or has a different pixel type \p t != \p T.
       - If a non-shared copy of the input image \p img is created, a new memory buffer is allocated for pixel data.
       - If a shared copy of the input image \p img is created, no extra memory is allocated and the pixel buffer of the instance
       image is the same as the one used by the input image \p img.
    **/
    template<typename t>
    CImg(const CImg<t>& img, const bool shared):_is_shared(false) {
      if (shared) {
        _width = _height = _depth = _spectrum = 0; _data = 0;
        throw CImgArgumentException(_cimg_instance
                                    "CImg() : Invalid construction request of a shared instance from a "
                                    "CImg<%s> image (%u,%u,%u,%u,%p) (pixel types are different).",
                                    cimg_instance,
                                    CImg<t>::pixel_type(),img._width,img._height,img._depth,img._spectrum,img._data);
      }

      const unsigned int siz = img.size();
      if (img._data && siz) {
        _width = img._width; _height = img._height; _depth = img._depth; _spectrum = img._spectrum;
        try { _data = new T[siz]; } catch (...) {
          _width = _height = _depth = _spectrum = 0; _data = 0;
          throw CImgInstanceException(_cimg_instance
                                      "CImg() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                      cimg_instance,
                                      cimg::strbuffersize(img._width*img._height*img._depth*img._spectrum*sizeof(T)),
                                      img._width,img._height,img._depth,img._spectrum);
        }
        const t *ptrs = img._data + siz; cimg_for(*this,ptrd,T) *ptrd = (T)*(--ptrs);
      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }
    }

    CImg(const CImg<T>& img, const bool shared) {
      const unsigned int siz = img.size();
      if (img._data && siz) {
        _width = img._width; _height = img._height; _depth = img._depth; _spectrum = img._spectrum; _is_shared = shared;
        if (_is_shared) _data = const_cast<T*>(img._data);
        else {
          try { _data = new T[siz]; } catch (...) {
            _width = _height = _depth = _spectrum = 0; _data = 0;
            throw CImgInstanceException(_cimg_instance
                                        "CImg() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                        cimg_instance,
                                        cimg::strbuffersize(img._width*img._height*img._depth*img._spectrum*sizeof(T)),
                                        img._width,img._height,img._depth,img._spectrum);
          }
          std::memcpy(_data,img._data,siz*sizeof(T));
        }
      } else { _width = _height = _depth = _spectrum = 0; _is_shared = false; _data = 0; }
    }

    //! Construct an image using dimensions of another image
    template<typename t>
    CImg(const CImg<t>& img, const char *const dimensions):_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
      assign(img,dimensions);
    }

    //! Construct an image using dimensions of another image, and fill it with given values.
    template<typename t>
    CImg(const CImg<t>& img, const char *const dimensions, const T val):
      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
      assign(img,dimensions).fill(val);
    }

    //! Construct an image using dimensions of another image, and fill it with given values.
    template<typename t>
    CImg(const CImg<t>& img, const char *const dimensions, const char *const values, const bool repeat_values):
      _width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
      assign(img,dimensions).fill(values,repeat_values);
    }

    //! Construct an image from the content of a CImgDisplay instance.
    explicit CImg(const CImgDisplay &disp):_width(0),_height(0),_depth(0),_spectrum(0),_is_shared(false),_data(0) {
      disp.snapshot(*this);
    }

    //! In-place version of the default constructor (STL-compliant name).
    /**
       This function is strictly equivalent to \ref assign() and has been
       introduced for having a STL-compatible function name.
    **/
    CImg<T>& clear() {
      return assign();
    }

    //! In-place version of the default constructor/destructor.
    /**
       This function replaces the instance image by an empty image.
       \remark
       - Memory used by the previous content of the instance image is freed if necessary.
       - If the instance image was initially shared, it is replaced by a (non-shared) empty image.
       - This function is useful to free memory used by an image that is not of use, but which
       has been created in the current code scope (i.e. not destroyed yet).
    **/
    CImg<T>& assign() {
      if (!_is_shared) delete[] _data;
      _width = _height = _depth = _spectrum = 0; _is_shared = false; _data = 0;
      return *this;
    }

    //! In-place version of the previous constructor.
    /**
       This function replaces the instance image by a new image of size (\p dx,\p dy,\p dz,\p dc) with pixels of type \p T.
       \param dx Desired size along the X-axis, i.e. the \ref width of the image.
       \param dy Desired size along the Y-axis, i.e. the \ref height of the image.
       \param dz Desired size along the Z-axis, i.e. the \ref depth of the image.
       \param dc Desired size along the C-axis, i.e. the number of image channels \p _spectrum.
       - If one of the input dimension \p dx,\p dy,\p dz or \p dc is set to 0, the instance image becomes empty
       and all has its dimensions set to 0. No memory for pixel data is then allocated.
       - Memory buffer used to store previous pixel values is freed if necessary.
       - If the instance image is shared, this constructor actually does nothing more than verifying
       that new and old image dimensions fit.
       - Image pixels allocated by this function are \b not \b initialized.
       Use the function assign(const unsigned int,const unsigned int,const unsigned int,const unsigned int,const T)
       to assign an image of desired size with pixels set to a particular value.
    **/
    CImg<T>& assign(const unsigned int dx, const unsigned int dy=1, const unsigned int dz=1, const unsigned int dc=1) {
      const unsigned int siz = dx*dy*dz*dc;
      if (!siz) return assign();
      const unsigned int curr_siz = size();
      if (siz!=curr_siz) {
        if (_is_shared)
          throw CImgArgumentException(_cimg_instance
                                      "assign() : Invalid assignement request of shared instance from specified image (%u,%u,%u,%u).",
                                      cimg_instance,
                                      dx,dy,dz,dc);
        else {
          delete[] _data;
          try { _data = new T[siz]; } catch (...) {
            _width = _height = _depth = _spectrum = 0; _data = 0;
            throw CImgInstanceException(_cimg_instance
                                        "assign() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                        cimg_instance,
                                        cimg::strbuffersize(dx*dy*dz*dc*sizeof(T)),dx,dy,dz,dc);
          }
        }
      }
      _width = dx; _height = dy; _depth = dz; _spectrum = dc;
      return *this;
    }

    //! In-place version of the previous constructor.
    /**
       This function replaces the instance image by a new image of size (\p dx,\p dy,\p dz,\p dc) with pixels of type \p T
       and sets all pixel values of the instance image to \p val.
       \param dx Desired size along the X-axis, i.e. the \ref width of the image.
       \param dy Desired size along the Y-axis, i.e. the \ref height of the image.
       \param dz Desired size along the Z-axis, i.e. the \ref depth of the image.
       \param dc Desired size along the C-axis, i.e. the number of image channels \p _spectrum.
       \param val Default value for image pixels.
       \remark
       - This function has the same properties as assign(const unsigned int,const unsigned int,const unsigned int,const unsigned int).
    **/
    CImg<T>& assign(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc, const T val) {
      return assign(dx,dy,dz,dc).fill(val);
    }

    //! In-place version of the previous constructor.
    CImg<T>& assign(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc,
                    const int val0, const int val1, ...) {
      assign(dx,dy,dz,dc);
      _CImg_stdarg(*this,val0,val1,dx*dy*dz*dc,int);
      return *this;
    }

    //! In-place version of the previous constructor.
    CImg<T>& assign(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc,
                    const double val0, const double val1, ...) {
      assign(dx,dy,dz,dc);
      _CImg_stdarg(*this,val0,val1,dx*dy*dz*dc,double);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    CImg<T>& assign(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc,
                    const char *const values, const bool repeat_values) {
      return assign(dx,dy,dz,dc).fill(values,repeat_values);
    }

    //! In-place version of the previous constructor.
    template<typename t>
    CImg<T>& assign(const t *const data_buffer, const unsigned int dx, const unsigned int dy=1,
                    const unsigned int dz=1, const unsigned int dc=1) {
      const unsigned int siz = dx*dy*dz*dc;
      if (!data_buffer || !siz) return assign();
      assign(dx,dy,dz,dc);
      const t *ptrs = data_buffer + siz; cimg_for(*this,ptrd,T) *ptrd = (T)*(--ptrs);
      return *this;
    }

    CImg<T>& assign(const T *const data_buffer, const unsigned int dx, const unsigned int dy=1,
                    const unsigned int dz=1, const unsigned int dc=1) {
      const unsigned int siz = dx*dy*dz*dc;
      if (!data_buffer || !siz) return assign();
      const unsigned int curr_siz = size();
      if (data_buffer==_data && siz==curr_siz) return assign(dx,dy,dz,dc);
      if (_is_shared || data_buffer+siz<_data || data_buffer>=_data+size()) {
        assign(dx,dy,dz,dc);
        if (_is_shared) std::memmove(_data,data_buffer,siz*sizeof(T));
        else std::memcpy(_data,data_buffer,siz*sizeof(T));
      } else {
        T *new_data = 0;
        try { new_data = new T[siz]; } catch (...) {
          _width = _height = _depth = _spectrum = 0; _data = 0;
          throw CImgInstanceException(_cimg_instance
                                      "assign() : Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                      cimg_instance,
                                      cimg::strbuffersize(dx*dy*dz*dc*sizeof(T)),dx,dy,dz,dc);
        }
        std::memcpy(new_data,data_buffer,siz*sizeof(T));
        delete[] _data; _data = new_data; _width = dx; _height = dy; _depth = dz; _spectrum = dc;
      }
      return *this;
    }

    //! In-place version of the previous constructor, allowing to force the shared state of the instance image.
    template<typename t>
    CImg<T>& assign(const t *const data_buffer, const unsigned int dx, const unsigned int dy,
                    const unsigned int dz, const unsigned int dc, const bool shared) {
      if (shared)
        throw CImgArgumentException(_cimg_instance
                                    "assign() : Invalid assignment request of shared instance from (%s*) buffer"
                                    "(pixel types are different).",
                                    cimg_instance,
                                    CImg<t>::pixel_type());

      return assign(data_buffer,dx,dy,dz,dc);
    }

    CImg<T>& assign(const T *const data_buffer, const unsigned int dx, const unsigned int dy,
                    const unsigned int dz, const unsigned int dc, const bool shared) {
      const unsigned int siz = dx*dy*dz*dc;
      if (!data_buffer || !siz) {
        if (shared) throw CImgArgumentException(_cimg_instance
                                                "assign() : Invalid assignment request of shared instance from (null) or empty buffer.",
                                                cimg_instance);
        else return assign();
      }
      if (!shared) { if (_is_shared) assign(); assign(data_buffer,dx,dy,dz,dc); }
      else {
        if (!_is_shared) {
          if (data_buffer+siz<_data || data_buffer>=_data+size()) assign();
          else cimg::warn(_cimg_instance
                          "assign() : Shared instance image has overlapping memory.",
                          cimg_instance);
        }
        _width = dx; _height = dy; _depth = dz; _spectrum = dc; _is_shared = true;
        _data = const_cast<T*>(data_buffer);
      }
      return *this;
    }

    //! In-place version of the previous constructor.
    /**
       This function replaces the instance image by the one that have been read from the given file.
       \param filename Filename of the image file.
       - The image format is deduced from the filename only by looking for the filename extension i.e. without
       analyzing the file itself.
       - Recognized image formats depend on the tools installed on your system or the external libraries you use to link your code with.
       More informations on this topic can be found in cimg_files_io.
       - If the filename is not found, a CImgIOException is thrown by this constructor.
    **/
    CImg<T>& assign(const char *const filename) {
      return load(filename);
    }

    //! In-place version of the default copy constructor.
    /**
       This function assigns a copy of the input image \p img to the current instance image.
       \param img The input image to copy.
       \remark
       - If the instance image is non-shared, the content of the input image \p img is copied into a new buffer
       becoming the new pixel buffer of the instance image, while the old pixel buffer is freed if necessary.
       - If the instance image is shared, the content of the input image \p img is copied into the current (shared) pixel buffer
       of the instance image, modifying then the image referenced by the shared instance image. The instance image still remains shared.
    **/
    template<typename t>
    CImg<T>& assign(const CImg<t>& img) {
      return assign(img._data,img._width,img._height,img._depth,img._spectrum);
    }

    //! In-place version of the advanced constructor.
    /**
       This function - as the simpler function assign(const CImg< t >&) - assigns a copy of the input image \p img to the
       current instance image. But it also decides if the copy is shared (if the input parameter \p shared is set to \c true)
       or non-shared (if the input parameter \p shared is set to \c false).
       \param img The input image to copy.
       \param shared Boolean flag that decides if the copy is shared or non-shared.
       \remark
       - It is not possible to assign a shared copy if the input image \p img is empty or has a different pixel type \p t != \p T.
       - If a non-shared copy of the input image \p img is assigned, a new memory buffer is allocated for pixel data.
       - If a shared copy of the input image \p img is assigned, no extra memory is allocated and the pixel buffer of the instance
       image is the same as the one used by the input image \p img.
    **/
    template<typename t>
    CImg<T>& assign(const CImg<t>& img, const bool shared) {
      return assign(img._data,img._width,img._height,img._depth,img._spectrum,shared);
    }

    //! In-place version of the previous constructor.
    template<typename t>
    CImg<T>& assign(const CImg<t>& img, const char *const dimensions) {
      if (!dimensions || !*dimensions) return assign(img._width,img._height,img._depth,img._spectrum);
      unsigned int siz[4] = { 0,1,1,1 }, k = 0;
      for (const char *s = dimensions; *s && k<4; ++k) {
        char item[256] = { 0 };
        if (std::sscanf(s,"%255[^0-9%xyzvwhdcXYZVWHDC]",item)>0) s+=std::strlen(item);
        if (*s) {
          unsigned int val = 0; char sep = 0;
          if (std::sscanf(s,"%u%c",&val,&sep)>0) {
            if (sep=='%') siz[k] = val*(k==0?_width:k==1?_height:k==2?_depth:_spectrum)/100;
            else siz[k] = val;
            while (*s>='0' && *s<='9') ++s; if (sep=='%') ++s;
          } else switch (cimg::uncase(*s)) {
          case 'x' : case 'w' : siz[k] = img._width; ++s; break;
          case 'y' : case 'h' : siz[k] = img._height; ++s; break;
          case 'z' : case 'd' : siz[k] = img._depth; ++s; break;
          case 'c' : case 's' : siz[k] = img._spectrum; ++s; break;
          default :
            throw CImgArgumentException(_cimg_instance
                                        "assign() : Invalid character '%c' detected in specified dimension string '%s'.",
                                        cimg_instance,
                                        *s,dimensions);
          }
        }
      }
      return assign(siz[0],siz[1],siz[2],siz[3]);
    }

    //! In-place version of the previous constructor.
    template<typename t>
    CImg<T>& assign(const CImg<t>& img, const char *const dimensions, const T val) {
      return assign(img,dimensions).fill(val);
    }

    //! In-place version of the previous constructor.
    template<typename t>
    CImg<T>& assign(const CImg<t>& img, const char *const dimensions, const char *const values, const bool repeat_values) {
      return assign(img,dimensions).fill(values,repeat_values);
    }

    //! In-place version of the previous constructor.
    CImg<T>& assign(const CImgDisplay &disp) {
      disp.snapshot(*this);
      return *this;
    }

    //! Move the content of the instance image into another one in a way that memory copies are avoided if possible.
    /**
       The instance image is always empty after a call to this function.
    **/
    template<typename t>
    CImg<t>& move_to(CImg<t>& img) {
      img.assign(*this);
      assign();
      return img;
    }

    CImg<T>& move_to(CImg<T>& img) {
      if (_is_shared || img._is_shared) img.assign(*this);
      else swap(img);
      assign();
      return img;
    }

    template<typename t>
    CImgList<t>& move_to(CImgList<t>& list, const unsigned int pos=~0U) {
      const unsigned int npos = pos>list._width?list._width:pos;
      move_to(list.insert(1,npos)[npos]);
      return list;
    }

    //! Return a reference to an empty image.
    static CImg<T>& empty() {
      static CImg<T> _empty;
      return _empty.assign();
    }

    //! Swap all fields of two images. Use with care !
    CImg<T>& swap(CImg<T>& img) {
      cimg::swap(_width,img._width);
      cimg::swap(_height,img._height);
      cimg::swap(_depth,img._depth);
      cimg::swap(_spectrum,img._spectrum);
      cimg::swap(_data,img._data);
      cimg::swap(_is_shared,img._is_shared);
      return img;
    }

    //@}
    //------------------------------------------
    //
    //! \name Overloaded Operators
    //@{
    //------------------------------------------

    //! Fast access to pixel value for reading or writing.
    /**
       \param x X-coordinate of the pixel.
       \param y Y-coordinate of the pixel.
       \param z Z-coordinate of the pixel.
       \param v C-coordinate of the pixel.

       - If one image dimension is equal to 1, it can be omitted in the coordinate list (see example below).
       - If the macro \c 'cimg_verbosity'>=3, boundary checking is performed and warning messages may appear
       (but function performances decrease).

       \par example:
       \code
       CImg<float> img(100,100,1,3,0);                       // Define a 100x100 color image with float-valued black pixels.
       const float valR = img(10,10,0,0);                    // Read the red component at coordinates (10,10).
       const float valG = img(10,10,0,1);                    // Read the green component at coordinates (10,10)
       const float valB = img(10,10,2);                      // Read the blue component at coordinates (10,10) (Z-coordinate omitted here).
       const float avg = (valR + valG + valB)/3;             // Compute average pixel value.
       img(10,10,0) = img(10,10,1) = img(10,10,2) = avg;     // Replace the pixel (10,10) by the average grey value.
       \endcode
    **/
#if cimg_verbosity>=3
    T& operator()(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) {
      const unsigned int off = (unsigned int)offset(x,y,z,c);
      if (!_data || off>=size()) {
        cimg::warn(_cimg_instance
                   "operator() : Invalid pixel request, at coordinates (%u,%u,%u,%u) [offset=%u].",
                   cimg_instance,
                   x,y,z,c,off);
        return *_data;
      }
      else return _data[off];
    }

    const T& operator()(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) const {
      return const_cast<CImg<T>*>(this)->operator()(x,y,z,c);
    }

    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c,
                  const unsigned long, const unsigned long=0) {
      return (*this)(x,y,z,c);
    }

    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c,
                        const unsigned long, const unsigned long=0) const {
      return (*this)(x,y,z,c);
    }
#else
    T& operator()(const unsigned int x) {
      return _data[x];
    }

    const T& operator()(const unsigned int x) const {
      return _data[x];
    }

    T& operator()(const unsigned int x, const unsigned int y) {
      return _data[x + y*_width];
    }

    const T& operator()(const unsigned int x, const unsigned int y) const {
      return _data[x + y*_width];
    }

    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z) {
      return _data[x + y*_width + z*_width*_height];
   }

    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z) const {
      return _data[x + y*_width + z*_width*_height];
    }

    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c) {
      return _data[x + y*_width + z*_width*_height + c*_width*_height*_depth];
    }

    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c) const {
      return _data[x + y*_width + z*_width*_height + c*_width*_height*_depth];
    }

    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int,
                  const unsigned long wh) {
      return _data[x + y*_width + z*wh];
    }

    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int,
                        const unsigned long wh) const {
      return _data[x + y*_width + z*wh];
    }

    T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c,
                  const unsigned long wh, const unsigned long whd) {
      return _data[x + y*_width + z*wh + c*whd];
    }

    const T& operator()(const unsigned int x, const unsigned int y, const unsigned int z, const unsigned int c,
                        const unsigned long wh, const unsigned long whd) const {
      return _data[x + y*_width + z*wh + c*whd];
    }
#endif

    //! Return address of the pixel buffer.
    operator const T*() const {
      return _data;
    }

    operator T*() {
      return _data;
    }

    //! Operator=().
    /**
       Assignment operator. Fill all pixels of the instance image with the same value.
       The image size is not modified.
    **/
    CImg<T>& operator=(const T val) {
      return fill(val);
    }

    //! Operator=().
    /**
       Assignment operator.
       If \p expression is a formula or a list of values, the image pixels are filled
       according to the expression and the image size is not modified.
       If \p expression is a filename, the image is replaced by the input file data
       (so image size is modified).
    **/
    CImg<T>& operator=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        fill(expression,true);
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        load(expression);
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator=().
    /**
       Assignement operator.
       If instance image is non-shared, replace the instance image by a copy of the argument image.
       If instance image is shared, replace the image content by the content of the argument image.
    **/
    template<typename t>
    CImg<T>& operator=(const CImg<t>& img) {
      return assign(img);
    }

    CImg<T>& operator=(const CImg<T>& img) {
      return assign(img);
    }

    //! Operator=().
    CImg<T>& operator=(const CImgDisplay& disp) {
      disp.snapshot(*this);
      return *this;
    }

    //! Operator+=().
    template<typename t>
    CImg<T>& operator+=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)(*ptrd + val);
      return *this;
    }

    //! Operator+=().
    CImg<T>& operator+=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator+=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)(*ptrd + mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this+=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator+=().
    template<typename t>
    CImg<T>& operator+=(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return *this+=+img;
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = (T)(*ptrd + *(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)(*ptrd + *(ptrs++));
      }
      return *this;
    }

    //! Operator++() (prefix).
    CImg<T>& operator++() {
      cimg_for(*this,ptrd,T) ++*ptrd;
      return *this;
    }

    //! Operator++() (postfix).
    CImg<T> operator++(int) {
      const CImg<T> copy(*this,false);
      ++*this;
      return copy;
    }

    //! Operator+() (unary).
    /**
       \remark
       - This operator always returns a non-shared copy of an image.
    **/
    CImg<T> operator+() const {
      return CImg<T>(*this,false);
    }

    //! Operator+().
    template<typename t>
    CImg<_cimg_Tt> operator+(const t val) const {
      return CImg<_cimg_Tt>(*this,false)+=val;
    }

    //! Operator+().
    CImg<Tfloat> operator+(const char *const expression) const {
      return CImg<Tfloat>(*this,false)+=expression;
    }

    //! Operator+().
    template<typename t>
    CImg<_cimg_Tt> operator+(const CImg<t>& img) const {
      return CImg<_cimg_Tt>(*this,false)+=img;
    }

    //! Operator-=().
    template<typename t>
    CImg<T>& operator-=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)(*ptrd - val);
      return *this;
    }

    //! Operator-=().
    CImg<T>& operator-=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator-=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)(*ptrd - mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this-=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator-=().
    template<typename t>
    CImg<T>& operator-=(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return *this-=+img;
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = (T)(*ptrd - *(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)(*ptrd - *(ptrs++));
      }
      return *this;
    }

    //! Operator--() (prefix).
    CImg<T>& operator--() {
      cimg_for(*this,ptrd,T) *ptrd = *ptrd-(T)1;
      return *this;
    }

    //! Operator--() (postfix).
    CImg<T> operator--(int) {
      const CImg<T> copy(*this,false);
      --*this;
      return copy;
    }

    //! Operator-() (unary).
    CImg<T> operator-() const {
      return CImg<T>(_width,_height,_depth,_spectrum,(T)0)-=*this;
    }

    //! Operator-().
    template<typename t>
    CImg<_cimg_Tt> operator-(const t val) const {
      return CImg<_cimg_Tt>(*this,false)-=val;
    }

    //! Operator-().
    CImg<Tfloat> operator-(const char *const expression) const {
      return CImg<Tfloat>(*this,false)-=expression;
    }

    //! Operator-().
    template<typename t>
    CImg<_cimg_Tt> operator-(const CImg<t>& img) const {
      return CImg<_cimg_Tt>(*this,false)-=img;
    }

    //! Operator*=().
    template<typename t>
    CImg<T>& operator*=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)(*ptrd * val);
      return *this;
    }

    //! Operator*=().
    CImg<T>& operator*=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator*=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)(*ptrd * mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<Tfloat> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this*=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator*=().
    template<typename t>
    CImg<T>& operator*=(const CImg<t>& img) {
      return ((*this)*img).move_to(*this);
    }

    //! Operator*().
    template<typename t>
    CImg<_cimg_Tt> operator*(const t val) const {
      return CImg<_cimg_Tt>(*this,false)*=val;
    }

    //! Operator*().
    CImg<Tfloat> operator*(const char *const expression) const {
      return CImg<Tfloat>(*this,false)*=expression;
    }

    //! Operator*().
    template<typename t>
    CImg<_cimg_Tt> operator*(const CImg<t>& img) const {
      if (_width!=img._height || _depth!=1 || _spectrum!=1)
        throw CImgArgumentException(_cimg_instance
                                    "operator*() : Invalid multiplication of instance by specified matrix (%u,%u,%u,%u,%p)",
                                    cimg_instance,
                                    img._width,img._height,img._depth,img._spectrum,img._data);

      CImg<_cimg_Tt> res(img._width,_height);
      _cimg_Tt val, *ptrd = res._data;
#ifdef cimg_use_openmp
#pragma omp parallel for if (size()>=1000 && img.size()>=1000) private(val)
#endif
      cimg_forXY(res,i,j) { val = 0; cimg_forX(*this,k) val+=(*this)(k,j)*img(i,k); *(ptrd++) = val; }
      return res;
    }

    //! Operator/=().
    template<typename t>
    CImg<T>& operator/=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)(*ptrd / val);
      return *this;
    }

    //! Operator/=().
    CImg<T>& operator/=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator/=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)(*ptrd / mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<Tfloat> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this/=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator/=().
    template<typename t>
    CImg<T>& operator/=(const CImg<t>& img) {
      return (*this*img.get_invert()).move_to(*this);
    }

    //! Operator/().
    template<typename t>
    CImg<_cimg_Tt> operator/(const t val) const {
      return CImg<_cimg_Tt>(*this,false)/=val;
    }

    //! Operator/().
    CImg<Tfloat> operator/(const char *const expression) const {
      return CImg<Tfloat>(*this,false)/=expression;
    }

    //! Operator/().
    template<typename t>
    CImg<_cimg_Tt> operator/(const CImg<t>& img) const {
      return (*this)*img.get_invert();
    }

    //! Operator%=().
    template<typename t>
    CImg<T>& operator%=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)cimg::mod(*ptrd,(T)val);
      return *this;
    }

    //! Operator%=().
    CImg<T>& operator%=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator%=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)cimg::mod(*ptrd,(T)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this%=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator%=().
    template<typename t>
    CImg<T>& operator%=(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return *this%=+img;
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = cimg::mod(*ptrd,(T)*(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = cimg::mod(*ptrd,(T)*(ptrs++));
      }
      return *this;
    }

    //! Operator%().
    template<typename t>
    CImg<_cimg_Tt> operator%(const t val) const {
      return CImg<_cimg_Tt>(*this,false)%=val;
    }

    //! Operator%().
    CImg<Tfloat> operator%(const char *const expression) const {
      return CImg<Tfloat>(*this,false)%=expression;
    }

    //! Operator%().
    template<typename t>
    CImg<_cimg_Tt> operator%(const CImg<t>& img) const {
      return CImg<_cimg_Tt>(*this,false)%=img;
    }

    //! Operator&=().
    template<typename t>
    CImg<T>& operator&=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)((unsigned long)*ptrd & (unsigned long)val);
      return *this;
    }

    //! Operator&=().
    CImg<T>& operator&=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator&=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)((unsigned long)*ptrd & (unsigned long)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this&=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator&=().
    template<typename t>
    CImg<T>& operator&=(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return *this&=+img;
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = (T)((unsigned long)*ptrd & (unsigned long)*(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((unsigned long)*ptrd & (unsigned long)*(ptrs++));
      }
      return *this;
    }

    //! Operator&().
    template<typename t>
    CImg<T> operator&(const t val) const {
      return (+*this)&=val;
    }

    //! Operator|=().
    template<typename t>
    CImg<T>& operator|=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)((unsigned long)*ptrd | (unsigned long)val);
      return *this;
    }

    //! Operator|=().
    CImg<T>& operator|=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator|=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)((unsigned long)*ptrd | (unsigned long)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this|=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator|=().
    template<typename t>
    CImg<T>& operator|=(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return *this|=+img;
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = (T)((unsigned long)*ptrd | (unsigned long)*(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((unsigned long)*ptrd | (unsigned long)*(ptrs++));
      }
      return *this;
    }

    //! Operator|().
    template<typename t>
    CImg<T> operator|(const t val) const {
      return (+*this)|=val;
    }

    //! Operator^=().
    template<typename t>
    CImg<T>& operator^=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)((unsigned long)*ptrd ^ (unsigned long)val);
      return *this;
    }

    //! Operator^=().
    CImg<T>& operator^=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator^=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)((unsigned long)*ptrd ^ (unsigned long)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this^=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator^=().
    template<typename t>
    CImg<T>& operator^=(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return *this^=+img;
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = (T)((unsigned long)*ptrd ^ (unsigned long)*(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((unsigned long)*ptrd ^ (unsigned long)*(ptrs++));
      }
      return *this;
    }

    //! Operator^().
    template<typename t>
    CImg<T> operator^(const t val) const {
      return (+*this)^=val;
    }

    //! Operator<<=().
    template<typename t>
    CImg<T>& operator<<=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)(((long)*ptrd) << (int)val);
      return *this;
    }

    //! Operator<<=().
    CImg<T>& operator<<=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator<<=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)((long)*ptrd << (int)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this<<=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator<<=().
    template<typename t>
    CImg<T>& operator<<=(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return *this^=+img;
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = (T)((long)*ptrd << (int)*(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((long)*ptrd << (int)*(ptrs++));
      }
      return *this;
    }

    //! Operator<<().
    template<typename t>
    CImg<T> operator<<(const t val) const {
      return (+*this)<<=val;
    }

    //! Operator>>=().
    template<typename t>
    CImg<T>& operator>>=(const t val) {
      cimg_for(*this,ptrd,T) *ptrd = (T)(((long)*ptrd) >> (int)val);
      return *this;
    }

    //! Operator>>=().
    CImg<T>& operator>>=(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"operator<<=");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)((long)*ptrd >> (int)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        *this>>=values;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Operator>>=().
    template<typename t>
    CImg<T>& operator>>=(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return *this^=+img;
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = (T)((long)*ptrd >> (int)*(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)((long)*ptrd >> (int)*(ptrs++));
      }
      return *this;
    }

    //! Operator>>().
    template<typename t>
    CImg<T> operator>>(const t val) const {
      return (+*this)>>=val;
    }

    //! Operator==().
    template<typename t>
    bool operator==(const CImg<t>& img) const {
      const unsigned int siz = size();
      bool vequal = true;
      if (siz!=img.size()) return false;
      t *ptrs = img._data + siz;
      for (T *ptrd = _data + siz; vequal && ptrd>_data; vequal = vequal && ((*(--ptrd))==(*(--ptrs)))) {}
      return vequal;
    }

    //! Operator!=().
    template<typename t>
    bool operator!=(const CImg<t>& img) const {
      return !((*this)==img);
    }

    //! Operator,().
    template<typename t>
    CImgList<_cimg_Tt> operator,(const CImg<t>& img) const {
      return CImgList<_cimg_Tt>(*this,img);
    }

    //! Operator,().
    template<typename t>
    CImgList<_cimg_Tt> operator,(CImgList<t>& list) const {
      return CImgList<_cimg_Tt>(list).insert(*this,0);
    }

    //! Operator<().
    CImgList<T> operator<(const char axis) const {
      return get_split(axis);
    }

    //! Operator~().
    CImg<T> operator~() const {
      CImg<T> res(_width,_height,_depth,_spectrum);
      const T *ptrs = end();
      cimg_for(res,ptrd,T) { const unsigned long val = (unsigned long)*(--ptrs); *ptrd = (T)~val; }
      return res;
    }

    //@}
    //-------------------------------------
    //
    //! \name Instance Characteristics
    //@{
    //-------------------------------------

    //! Return the type of the pixel values.
    /**
       \return a string describing the type of the image pixels (template parameter \p T).
       - The string returned may contains spaces (<tt>"unsigned char"</tt>).
       - If the template parameter T does not correspond to a registered type, the string <tt>"unknown"</tt> is returned.
    **/
    static const char* pixel_type() {
      return cimg::type<T>::string();
    }

    //! Return the number of columns of the instance image (size along the X-axis, i.e image width).
    int width() const {
      return (int)_width;
    }

    //! Return the number of rows of the instance image (size along the Y-axis, i.e image height).
    int height() const {
      return (int)_height;
    }

    //! Return the number of slices of the instance image (size along the Z-axis).
    int depth() const {
      return (int)_depth;
    }

    //! Return the number of vector channels of the instance image (size along the C-axis).
    int spectrum() const {
      return (int)_spectrum;
    }

    //! Return the number of image buffer elements.
    /**
       - Equivalent to : width() * height() * depth() * spectrum().

       \par example:
       \code
       CImg<> img(100,100,1,3);
       if (img.size()==100*100*3) std::fprintf(stderr,"This statement is true");
       \endcode
    **/
    unsigned int size() const {
      return _width*_height*_depth*_spectrum;
    }

    //! Return a pointer to the pixel buffer.
    T* data() {
      return _data;
    }

    const T* data() const {
      return _data;
    }

    //! Return a pointer to the pixel value located at (\p x,\p y,\p z,\p v).
    /**
       \param x X-coordinate of the pixel.
       \param y Y-coordinate of the pixel.
       \param z Z-coordinate of the pixel.
       \param v C-coordinate of the pixel.

       - When called without parameters, data() returns a pointer to the begining of the pixel buffer.
       - If the macro \c 'cimg_verbosity'>=3, boundary checking is performed and warning messages may appear if
       given coordinates are outside the image range (but function performances decrease).

       \par example:
       \code
       CImg<float> img(100,100,1,1,0);   // Define a 100x100 greyscale image with float-valued pixels.
       float *ptr = data(10,10);         // Get a pointer to the pixel located at (10,10).
       float val = *ptr;                 // Get the pixel value.
       \endcode
    **/
#if cimg_verbosity>=3
    T *data(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) {
      const unsigned int off = (unsigned int)offset(x,y,z,c);
      if (off>=size()) {
        cimg::warn(_cimg_instance
                   "data() : Invalid pointer request, at coordinates (%u,%u,%u,%u) [offset=%u].",
                   cimg_instance,
                   x,y,z,c,off);
        return _data;
      }
      return _data + off;
    }

    const T* data(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) const {
      return const_cast<CImg<T>*>(this)->data(x,y,z,c);
    }
#else
    T* data(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) {
      return _data + x + y*_width + z*_width*_height + c*_width*_height*_depth;
    }

    const T* data(const unsigned int x, const unsigned int y=0, const unsigned int z=0, const unsigned int c=0) const {
      return _data + x + y*_width + z*_width*_height + c*_width*_height*_depth;
    }
#endif

    //! Return the offset of the pixel coordinates (\p x,\p y,\p z,\p v) with respect to the data pointer \c data.
    /**
       \param x X-coordinate of the pixel.
       \param y Y-coordinate of the pixel.
       \param z Z-coordinate of the pixel.
       \param v C-coordinate of the pixel.

       - No checking is done on the validity of the given coordinates.

       \par Example:
       \code
       CImg<float> img(100,100,1,3,0);         // Define a 100x100 color image with float-valued black pixels.
       long off = img.offset(10,10,0,2);       // Get the offset of the blue value of the pixel located at (10,10).
       float val = img[off];                   // Get the blue value of the pixel.
       \endcode
    **/
    int offset(const int x, const int y=0, const int z=0, const int c=0) const {
      return x + y*_width + z*_width*_height + c*_width*_height*_depth;
    }

    //! Return an iterator to the first image pixel
    iterator begin() {
      return _data;
    }

    const_iterator begin() const {
      return _data;
    }

    //! Return an iterator pointing after the last image pixel (STL-compliant name).
    iterator end() {
      return _data + size();
    }

    const_iterator end() const {
      return _data + size();
    }

    //! Return reference to the first image pixel (STL-compliant name).
    const T& front() const {
      return *_data;
    }

    T& front() {
      return *_data;
    }

    //! Return a reference to the last image pixel (STL-compliant name).
    const T& back() const {
      return *(_data + size() - 1);
    }

    T& back() {
      return *(_data + size() - 1);
    }

    //! Read a pixel value with Dirichlet boundary conditions.
    T& at(const int off, const T out_val) {
      return (off<0 || off>=(int)size())?(cimg::temporary(out_val)=out_val):(*this)[off];
    }

    T at(const int off, const T out_val) const {
      return (off<0 || off>=(int)size())?out_val:(*this)[off];
    }

    //! Read a pixel value with Neumann boundary conditions.
    T& at(const int off) {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "at() : Empty instance.",
                                    cimg_instance);
      return _at(off);
    }

    T at(const int off) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "at() : Empty instance.",
                                    cimg_instance);
      return _at(off);
    }

    T& _at(const int off) {
      const unsigned int siz = (unsigned int)size();
      return (*this)[off<0?0:(unsigned int)off>=siz?siz-1:off];
    }

    T _at(const int off) const {
      const unsigned int siz = (unsigned int)size();
      return (*this)[off<0?0:(unsigned int)off>=siz?siz-1:off];
    }

    //! Read a pixel value with Dirichlet boundary conditions for the first coordinates (\c x).
    T& atX(const int x, const int y, const int z, const int c, const T out_val) {
      return (x<0 || x>=width())?(cimg::temporary(out_val)=out_val):(*this)(x,y,z,c);
    }

    T atX(const int x, const int y, const int z, const int c, const T out_val) const {
      return (x<0 || x>=width())?out_val:(*this)(x,y,z,c);
    }

    //! Read a pixel value with Neumann boundary conditions for the first coordinates (\c x).
    T& atX(const int x, const int y=0, const int z=0, const int c=0) {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "atX() : Empty instance.",
                                    cimg_instance);
      return _atX(x,y,z,c);
    }

    T atX(const int x, const int y=0, const int z=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "atX() : Empty instance.",
                                    cimg_instance);
      return _atX(x,y,z,c);
    }

    T& _atX(const int x, const int y=0, const int z=0, const int c=0) {
      return (*this)(x<0?0:(x>=width()?width()-1:x),y,z,c);
    }

    T _atX(const int x, const int y=0, const int z=0, const int c=0) const {
      return (*this)(x<0?0:(x>=width()?width()-1:x),y,z,c);
    }

    //! Read a pixel value with Dirichlet boundary conditions for the two first coordinates (\c x,\c y).
    T& atXY(const int x, const int y, const int z, const int c, const T out_val) {
      return (x<0 || y<0 || x>=width() || y>=height())?(cimg::temporary(out_val)=out_val):(*this)(x,y,z,c);
    }

    T atXY(const int x, const int y, const int z, const int c, const T out_val) const {
      return (x<0 || y<0 || x>=width() || y>=height())?out_val:(*this)(x,y,z,c);
    }

    //! Read a pixel value with Neumann boundary conditions for the two first coordinates (\c x,\c y).
    T& atXY(const int x, const int y, const int z=0, const int c=0) {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "atXY() : Empty instance.",
                                    cimg_instance);
      return _atXY(x,y,z,c);
    }

    T atXY(const int x, const int y, const int z=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "atXY() : Empty instance.",
                                    cimg_instance);
      return _atXY(x,y,z,c);
    }

    T& _atXY(const int x, const int y, const int z=0, const int c=0) {
      return (*this)(x<0?0:(x>=width()?width()-1:x), y<0?0:(y>=height()?height()-1:y),z,c);
    }

    T _atXY(const int x, const int y, const int z=0, const int c=0) const {
      return (*this)(x<0?0:(x>=width()?width()-1:x), y<0?0:(y>=height()?height()-1:y),z,c);
    }

    //! Read a pixel value with Dirichlet boundary conditions for the three first coordinates (\c x,\c y,\c z).
    T& atXYZ(const int x, const int y, const int z, const int c, const T out_val) {
      return (x<0 || y<0 || z<0 || x>=width() || y>=height() || z>=depth())?
        (cimg::temporary(out_val)=out_val):(*this)(x,y,z,c);
    }

    T atXYZ(const int x, const int y, const int z, const int c, const T out_val) const {
      return (x<0 || y<0 || z<0 || x>=width() || y>=height() || z>=depth())?out_val:(*this)(x,y,z,c);
    }

    //! Read a pixel value with Neumann boundary conditions for the three first coordinates (\c x,\c y,\c z).
    T& atXYZ(const int x, const int y, const int z, const int c=0) {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "atXYZ() : Empty instance.",
                                    cimg_instance);
      return _atXYZ(x,y,z,c);
    }

    T atXYZ(const int x, const int y, const int z, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "atXYZ() : Empty instance.",
                                    cimg_instance);
      return _atXYZ(x,y,z,c);
    }

    T& _atXYZ(const int x, const int y, const int z, const int c=0) {
      return (*this)(x<0?0:(x>=width()?width()-1:x),y<0?0:(y>=height()?height()-1:y),
                     z<0?0:(z>=depth()?depth()-1:z),c);
    }

    T _atXYZ(const int x, const int y, const int z, const int c=0) const {
      return (*this)(x<0?0:(x>=width()?width()-1:x),y<0?0:(y>=height()?height()-1:y),
                     z<0?0:(z>=depth()?depth()-1:z),c);
    }

    //! Read a pixel value with Dirichlet boundary conditions.
    T& atXYZC(const int x, const int y, const int z, const int c, const T out_val) {
      return (x<0 || y<0 || z<0 || c<0 || x>=width() || y>=height() || z>=depth() || c>=spectrum())?
        (cimg::temporary(out_val)=out_val):(*this)(x,y,z,c);
    }

    T atXYZC(const int x, const int y, const int z, const int c, const T out_val) const {
      return (x<0 || y<0 || z<0 || c<0 || x>=width() || y>=height() || z>=depth() || c>=spectrum())?out_val:(*this)(x,y,z,c);
    }

    //! Read a pixel value with Neumann boundary conditions.
    T& atXYZC(const int x, const int y, const int z, const int c) {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "atXYZC() : Empty instance.",
                                    cimg_instance);
      return _atXYZC(x,y,z,c);
    }

    T atXYZC(const int x, const int y, const int z, const int c) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "atXYZC() : Empty instance.",
                                    cimg_instance);
      return _atXYZC(x,y,z,c);
    }

    T& _atXYZC(const int x, const int y, const int z, const int c) {
      return (*this)(x<0?0:(x>=width()?width()-1:x), y<0?0:(y>=height()?height()-1:y),
                     z<0?0:(z>=depth()?depth()-1:z), c<0?0:(c>=spectrum()?spectrum()-1:c));
    }

    T _atXYZC(const int x, const int y, const int z, const int c) const {
      return (*this)(x<0?0:(x>=width()?width()-1:x), y<0?0:(y>=height()?height()-1:y),
                     z<0?0:(z>=depth()?depth()-1:z), c<0?0:(c>=spectrum()?spectrum()-1:c));
    }

    //! Read a pixel value using linear interpolation and Dirichlet boundary conditions (first coordinate).
    Tfloat linear_atX(const float fx, const int y, const int z, const int c, const T out_val) const {
      const int
        x = (int)fx - (fx>=0?0:1), nx = x + 1;
      const float
        dx = fx - x;
      const Tfloat
        Ic = (Tfloat)atX(x,y,z,c,out_val), In = (Tfloat)atXY(nx,y,z,c,out_val);
      return Ic + dx*(In-Ic);
    }

    //! Read a pixel value using linear interpolation and Neumann boundary conditions (first coordinate).
    Tfloat linear_atX(const float fx, const int y=0, const int z=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "linear_atX() : Empty instance.",
                                    cimg_instance);

      return _linear_atX(fx,y,z,c);
    }

    Tfloat _linear_atX(const float fx, const int y=0, const int z=0, const int c=0) const {
      const float
        nfx = fx<0?0:(fx>_width-1?_width-1:fx);
      const unsigned int
        x = (unsigned int)nfx;
      const float
        dx = nfx - x;
      const unsigned int
        nx = dx>0?x+1:x;
      const Tfloat
        Ic = (Tfloat)(*this)(x,y,z,c), In = (Tfloat)(*this)(nx,y,z,c);
      return Ic + dx*(In-Ic);
    }

    //! Read a pixel value using linear interpolation and Dirichlet boundary conditions (first two coordinates).
    Tfloat linear_atXY(const float fx, const float fy, const int z, const int c, const T out_val) const {
      const int
        x = (int)fx - (fx>=0?0:1), nx = x + 1,
        y = (int)fy - (fy>=0?0:1), ny = y + 1;
      const float
        dx = fx - x,
        dy = fy - y;
      const Tfloat
        Icc = (Tfloat)atXY(x,y,z,c,out_val),  Inc = (Tfloat)atXY(nx,y,z,c,out_val),
        Icn = (Tfloat)atXY(x,ny,z,c,out_val), Inn = (Tfloat)atXY(nx,ny,z,c,out_val);
      return Icc + dx*(Inc-Icc + dy*(Icc+Inn-Icn-Inc)) + dy*(Icn-Icc);
    }

    //! Read a pixel value using linear interpolation and Neumann boundary conditions (first two coordinates).
    Tfloat linear_atXY(const float fx, const float fy, const int z=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "linear_atXY() : Empty instance.",
                                    cimg_instance);

      return _linear_atXY(fx,fy,z,c);
    }

    Tfloat _linear_atXY(const float fx, const float fy, const int z=0, const int c=0) const {
      const float
        nfx = fx<0?0:(fx>_width-1?_width-1:fx),
        nfy = fy<0?0:(fy>_height-1?_height-1:fy);
      const unsigned int
        x = (unsigned int)nfx,
        y = (unsigned int)nfy;
      const float
        dx = nfx - x,
        dy = nfy - y;
      const unsigned int
        nx = dx>0?x+1:x,
        ny = dy>0?y+1:y;
      const Tfloat
        Icc = (Tfloat)(*this)(x,y,z,c),  Inc = (Tfloat)(*this)(nx,y,z,c),
        Icn = (Tfloat)(*this)(x,ny,z,c), Inn = (Tfloat)(*this)(nx,ny,z,c);
      return Icc + dx*(Inc-Icc + dy*(Icc+Inn-Icn-Inc)) + dy*(Icn-Icc);
    }

    //! Read a pixel value using linear interpolation and Dirichlet boundary conditions (first three coordinates).
    Tfloat linear_atXYZ(const float fx, const float fy, const float fz, const int c, const T out_val) const {
      const int
        x = (int)fx - (fx>=0?0:1), nx = x + 1,
        y = (int)fy - (fy>=0?0:1), ny = y + 1,
        z = (int)fz - (fz>=0?0:1), nz = z + 1;
      const float
        dx = fx - x,
        dy = fy - y,
        dz = fz - z;
      const Tfloat
        Iccc = (Tfloat)atXYZ(x,y,z,c,out_val), Incc = (Tfloat)atXYZ(nx,y,z,c,out_val),
        Icnc = (Tfloat)atXYZ(x,ny,z,c,out_val), Innc = (Tfloat)atXYZ(nx,ny,z,c,out_val),
        Iccn = (Tfloat)atXYZ(x,y,nz,c,out_val), Incn = (Tfloat)atXYZ(nx,y,nz,c,out_val),
        Icnn = (Tfloat)atXYZ(x,ny,nz,c,out_val), Innn = (Tfloat)atXYZ(nx,ny,nz,c,out_val);
      return Iccc +
        dx*(Incc-Iccc +
            dy*(Iccc+Innc-Icnc-Incc +
                dz*(Iccn+Innn+Icnc+Incc-Icnn-Incn-Iccc-Innc)) +
            dz*(Iccc+Incn-Iccn-Incc)) +
        dy*(Icnc-Iccc +
            dz*(Iccc+Icnn-Iccn-Icnc)) +
        dz*(Iccn-Iccc);
    }

    //! Read a pixel value using linear interpolation and Neumann boundary conditions (first three coordinates).
    Tfloat linear_atXYZ(const float fx, const float fy=0, const float fz=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "linear_atXYZ() : Empty instance.",
                                    cimg_instance);

      return _linear_atXYZ(fx,fy,fz,c);
    }

    Tfloat _linear_atXYZ(const float fx, const float fy=0, const float fz=0, const int c=0) const {
      const float
        nfx = fx<0?0:(fx>_width-1?_width-1:fx),
        nfy = fy<0?0:(fy>_height-1?_height-1:fy),
        nfz = fz<0?0:(fz>_depth-1?_depth-1:fz);
      const unsigned int
        x = (unsigned int)nfx,
        y = (unsigned int)nfy,
        z = (unsigned int)nfz;
      const float
        dx = nfx - x,
        dy = nfy - y,
        dz = nfz - z;
      const unsigned int
        nx = dx>0?x+1:x,
        ny = dy>0?y+1:y,
        nz = dz>0?z+1:z;
      const Tfloat
        Iccc = (Tfloat)(*this)(x,y,z,c), Incc = (Tfloat)(*this)(nx,y,z,c),
        Icnc = (Tfloat)(*this)(x,ny,z,c), Innc = (Tfloat)(*this)(nx,ny,z,c),
        Iccn = (Tfloat)(*this)(x,y,nz,c), Incn = (Tfloat)(*this)(nx,y,nz,c),
        Icnn = (Tfloat)(*this)(x,ny,nz,c), Innn = (Tfloat)(*this)(nx,ny,nz,c);
      return Iccc +
        dx*(Incc-Iccc +
            dy*(Iccc+Innc-Icnc-Incc +
                dz*(Iccn+Innn+Icnc+Incc-Icnn-Incn-Iccc-Innc)) +
            dz*(Iccc+Incn-Iccn-Incc)) +
        dy*(Icnc-Iccc +
            dz*(Iccc+Icnn-Iccn-Icnc)) +
        dz*(Iccn-Iccc);
    }

    //! Read a pixel value using linear interpolation and Dirichlet boundary conditions.
    Tfloat linear_atXYZC(const float fx, const float fy, const float fz, const float fc, const T out_val) const {
      const int
        x = (int)fx - (fx>=0?0:1), nx = x + 1,
        y = (int)fy - (fy>=0?0:1), ny = y + 1,
        z = (int)fz - (fz>=0?0:1), nz = z + 1,
        c = (int)fc - (fc>=0?0:1), nc = c + 1;
      const float
        dx = fx - x,
        dy = fy - y,
        dz = fz - z,
        dc = fc - c;
      const Tfloat
        Icccc = (Tfloat)atXYZC(x,y,z,c,out_val), Inccc = (Tfloat)atXYZC(nx,y,z,c,out_val),
        Icncc = (Tfloat)atXYZC(x,ny,z,c,out_val), Inncc = (Tfloat)atXYZC(nx,ny,z,c,out_val),
        Iccnc = (Tfloat)atXYZC(x,y,nz,c,out_val), Incnc = (Tfloat)atXYZC(nx,y,nz,c,out_val),
        Icnnc = (Tfloat)atXYZC(x,ny,nz,c,out_val), Innnc = (Tfloat)atXYZC(nx,ny,nz,c,out_val),
        Icccn = (Tfloat)atXYZC(x,y,z,nc,out_val), Inccn = (Tfloat)atXYZC(nx,y,z,nc,out_val),
        Icncn = (Tfloat)atXYZC(x,ny,z,nc,out_val), Inncn = (Tfloat)atXYZC(nx,ny,z,nc,out_val),
        Iccnn = (Tfloat)atXYZC(x,y,nz,nc,out_val), Incnn = (Tfloat)atXYZC(nx,y,nz,nc,out_val),
        Icnnn = (Tfloat)atXYZC(x,ny,nz,nc,out_val), Innnn = (Tfloat)atXYZC(nx,ny,nz,nc,out_val);
      return Icccc +
        dx*(Inccc-Icccc +
            dy*(Icccc+Inncc-Icncc-Inccc +
                dz*(Iccnc+Innnc+Icncc+Inccc-Icnnc-Incnc-Icccc-Inncc +
                    dc*(Iccnn+Innnn+Icncn+Inccn+Icnnc+Incnc+Icccc+Inncc-Icnnn-Incnn-Icccn-Inncn-Iccnc-Innnc-Icncc-Inccc)) +
                dc*(Icccn+Inncn+Icncc+Inccc-Icncn-Inccn-Icccc-Inncc)) +
            dz*(Icccc+Incnc-Iccnc-Inccc +
                dc*(Icccn+Incnn+Iccnc+Inccc-Iccnn-Inccn-Icccc-Incnc)) +
            dc*(Icccc+Inccn-Inccc-Icccn)) +
        dy*(Icncc-Icccc +
            dz*(Icccc+Icnnc-Iccnc-Icncc +
                dc*(Icccn+Icnnn+Iccnc+Icncc-Iccnn-Icncn-Icccc-Icnnc)) +
            dc*(Icccc+Icncn-Icncc-Icccn)) +
        dz*(Iccnc-Icccc +
            dc*(Icccc+Iccnn-Iccnc-Icccn)) +
        dc*(Icccn-Icccc);
    }

    //! Read a pixel value using linear interpolation and Neumann boundary conditions.
    Tfloat linear_atXYZC(const float fx, const float fy=0, const float fz=0, const float fc=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "linear_atXYZC() : Empty instance.",
                                    cimg_instance);

      return _linear_atXYZC(fx,fy,fz,fc);
    }

    Tfloat _linear_atXYZC(const float fx, const float fy=0, const float fz=0, const float fc=0) const {
      const float
        nfx = fx<0?0:(fx>_width-1?_width-1:fx),
        nfy = fy<0?0:(fy>_height-1?_height-1:fy),
        nfz = fz<0?0:(fz>_depth-1?_depth-1:fz),
        nfc = fc<0?0:(fc>_spectrum-1?_spectrum-1:fc);
      const unsigned int
        x = (unsigned int)nfx,
        y = (unsigned int)nfy,
        z = (unsigned int)nfz,
        c = (unsigned int)nfc;
      const float
        dx = nfx - x,
        dy = nfy - y,
        dz = nfz - z,
        dc = nfc - c;
      const unsigned int
        nx = dx>0?x+1:x,
        ny = dy>0?y+1:y,
        nz = dz>0?z+1:z,
        nc = dc>0?c+1:c;
      const Tfloat
        Icccc = (Tfloat)(*this)(x,y,z,c), Inccc = (Tfloat)(*this)(nx,y,z,c),
        Icncc = (Tfloat)(*this)(x,ny,z,c), Inncc = (Tfloat)(*this)(nx,ny,z,c),
        Iccnc = (Tfloat)(*this)(x,y,nz,c), Incnc = (Tfloat)(*this)(nx,y,nz,c),
        Icnnc = (Tfloat)(*this)(x,ny,nz,c), Innnc = (Tfloat)(*this)(nx,ny,nz,c),
        Icccn = (Tfloat)(*this)(x,y,z,nc), Inccn = (Tfloat)(*this)(nx,y,z,nc),
        Icncn = (Tfloat)(*this)(x,ny,z,nc), Inncn = (Tfloat)(*this)(nx,ny,z,nc),
        Iccnn = (Tfloat)(*this)(x,y,nz,nc), Incnn = (Tfloat)(*this)(nx,y,nz,nc),
        Icnnn = (Tfloat)(*this)(x,ny,nz,nc), Innnn = (Tfloat)(*this)(nx,ny,nz,nc);
      return Icccc +
        dx*(Inccc-Icccc +
            dy*(Icccc+Inncc-Icncc-Inccc +
                dz*(Iccnc+Innnc+Icncc+Inccc-Icnnc-Incnc-Icccc-Inncc +
                    dc*(Iccnn+Innnn+Icncn+Inccn+Icnnc+Incnc+Icccc+Inncc-Icnnn-Incnn-Icccn-Inncn-Iccnc-Innnc-Icncc-Inccc)) +
                dc*(Icccn+Inncn+Icncc+Inccc-Icncn-Inccn-Icccc-Inncc)) +
            dz*(Icccc+Incnc-Iccnc-Inccc +
                dc*(Icccn+Incnn+Iccnc+Inccc-Iccnn-Inccn-Icccc-Incnc)) +
            dc*(Icccc+Inccn-Inccc-Icccn)) +
        dy*(Icncc-Icccc +
            dz*(Icccc+Icnnc-Iccnc-Icncc +
                dc*(Icccn+Icnnn+Iccnc+Icncc-Iccnn-Icncn-Icccc-Icnnc)) +
            dc*(Icccc+Icncn-Icncc-Icccn)) +
        dz*(Iccnc-Icccc +
            dc*(Icccc+Iccnn-Iccnc-Icccn)) +
        dc*(Icccn-Icccc);
    }

    //! Read a pixel value using cubic interpolation and Dirichlet boundary conditions (first coordinates).
    Tfloat cubic_atX(const float fx, const int y, const int z, const int c, const T out_val) const {
      const int
        x = (int)fx - (fx>=0?0:1), px = x - 1, nx = x + 1, ax = x + 2;
      const float
        dx = fx - x;
      const Tfloat
        Ip = (Tfloat)atX(px,y,z,c,out_val), Ic = (Tfloat)atX(x,y,z,c,out_val),
        In = (Tfloat)atX(nx,y,z,c,out_val), Ia = (Tfloat)atX(ax,y,z,c,out_val);
      return Ic + 0.5f*(dx*(-Ip+In) + dx*dx*(2*Ip-5*Ic+4*In-Ia) + dx*dx*dx*(-Ip+3*Ic-3*In+Ia));
    }

    //! Read a pixel value using cubic interpolation and Dirichlet boundary conditions (first coordinates).
    Tfloat cubic_atX(const float fx, const int y, const int z, const int c, const T out_val,
                     const Tfloat min_val, const Tfloat max_val) const {
      const Tfloat val = cubic_atX(fx,y,z,c,out_val);
      return val<min_val?min_val:val>max_val?max_val:val;
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions (first coordinates).
    Tfloat cubic_atX(const float fx, const int y=0, const int z=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "cubic_atX() : Empty instance.",
                                    cimg_instance);
      return _cubic_atX(fx,y,z,c);
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions (first coordinates).
    Tfloat cubic_atX(const float fx, const int y, const int z, const int c,
                     const Tfloat min_val, const Tfloat max_val) const {
      const Tfloat val = cubic_atX(fx,y,z,c);
      return val<min_val?min_val:val>max_val?max_val:val;
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions (first coordinates).
    Tfloat _cubic_atX(const float fx, const int y=0, const int z=0, const int c=0) const {
      const float
        nfx = fx<0?0:(fx>_width-1?_width-1:fx);
      const int
        x = (int)nfx;
      const float
        dx = nfx - x;
      const int
        px = x-1<0?0:x-1, nx = dx>0?x+1:x, ax = x+2>=width()?width()-1:x+2;
      const Tfloat
        Ip = (Tfloat)(*this)(px,y,z,c), Ic = (Tfloat)(*this)(x,y,z,c),
        In = (Tfloat)(*this)(nx,y,z,c), Ia = (Tfloat)(*this)(ax,y,z,c);
      return Ic + 0.5f*(dx*(-Ip+In) + dx*dx*(2*Ip-5*Ic+4*In-Ia) + dx*dx*dx*(-Ip+3*Ic-3*In+Ia));
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions (first coordinates).
    Tfloat _cubic_atX(const float fx, const int y, const int z, const int c,
                      const Tfloat min_val, const Tfloat max_val) const {
      const Tfloat val = _cubic_atX(fx,y,z,c);
      return val<min_val?min_val:val>max_val?max_val:val;
    }

    //! Read a pixel value using cubic interpolation and Dirichlet boundary conditions.
    Tfloat cubic_atXY(const float fx, const float fy, const int z, const int c, const T out_val) const {
      const int
        x = (int)fx - (fx>=0?0:1), px = x - 1, nx = x + 1, ax = x + 2,
        y = (int)fy - (fy>=0?0:1), py = y - 1, ny = y + 1, ay = y + 2;
      const float dx = fx - x, dy = fy - y;
      const Tfloat
        Ipp = (Tfloat)atXY(px,py,z,c,out_val), Icp = (Tfloat)atXY(x,py,z,c,out_val), Inp = (Tfloat)atXY(nx,py,z,c,out_val), Iap = (Tfloat)atXY(ax,py,z,c,out_val),
        Ip = Icp + 0.5f*(dx*(-Ipp+Inp) + dx*dx*(2*Ipp-5*Icp+4*Inp-Iap) + dx*dx*dx*(-Ipp+3*Icp-3*Inp+Iap)),
        Ipc = (Tfloat)atXY(px,y,z,c,out_val),  Icc = (Tfloat)atXY(x, y,z,c,out_val), Inc = (Tfloat)atXY(nx,y,z,c,out_val),  Iac = (Tfloat)atXY(ax,y,z,c,out_val),
        Ic = Icc + 0.5f*(dx*(-Ipc+Inc) + dx*dx*(2*Ipc-5*Icc+4*Inc-Iac) + dx*dx*dx*(-Ipc+3*Icc-3*Inc+Iac)),
        Ipn = (Tfloat)atXY(px,ny,z,c,out_val), Icn = (Tfloat)atXY(x,ny,z,c,out_val), Inn = (Tfloat)atXY(nx,ny,z,c,out_val), Ian = (Tfloat)atXY(ax,ny,z,c,out_val),
        In = Icn + 0.5f*(dx*(-Ipn+Inn) + dx*dx*(2*Ipn-5*Icn+4*Inn-Ian) + dx*dx*dx*(-Ipn+3*Icn-3*Inn+Ian)),
        Ipa = (Tfloat)atXY(px,ay,z,c,out_val), Ica = (Tfloat)atXY(x,ay,z,c,out_val), Ina = (Tfloat)atXY(nx,ay,z,c,out_val), Iaa = (Tfloat)atXY(ax,ay,z,c,out_val),
        Ia = Ica + 0.5f*(dx*(-Ipa+Ina) + dx*dx*(2*Ipa-5*Ica+4*Ina-Iaa) + dx*dx*dx*(-Ipa+3*Ica-3*Ina+Iaa));
      return Ic + 0.5f*(dy*(-Ip+In) + dy*dy*(2*Ip-5*Ic+4*In-Ia) + dy*dy*dy*(-Ip+3*Ic-3*In+Ia));
    }

    //! Read a pixel value using cubic interpolation and Dirichlet boundary conditions.
    Tfloat cubic_atXY(const float fx, const float fy, const int z, const int c, const T out_val,
                      const Tfloat min_val, const Tfloat max_val) const {
      const Tfloat val = cubic_atXY(fx,fy,z,c,out_val);
      return val<min_val?min_val:val>max_val?max_val:val;
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions.
    Tfloat cubic_atXY(const float fx, const float fy, const int z=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "cubic_atXY() : Empty instance.",
                                    cimg_instance);

      return _cubic_atXY(fx,fy,z,c);
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions.
    Tfloat cubic_atXY(const float fx, const float fy, const int z, const int c,
                      const Tfloat min_val, const Tfloat max_val) const {
      const Tfloat val = cubic_atXY(fx,fy,z,c);
      return val<min_val?min_val:val>max_val?max_val:val;
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions.
    Tfloat _cubic_atXY(const float fx, const float fy, const int z=0, const int c=0) const {
      const float
        nfx = fx<0?0:(fx>_width-1?_width-1:fx),
        nfy = fy<0?0:(fy>_height-1?_height-1:fy);
      const int x = (int)nfx, y = (int)nfy;
      const float dx = nfx - x, dy = nfy - y;
      const int
        px = x-1<0?0:x-1, nx = dx>0?x+1:x, ax = x+2>=width()?width()-1:x+2,
        py = y-1<0?0:y-1, ny = dy>0?y+1:y, ay = y+2>=height()?height()-1:y+2;
      const Tfloat
        Ipp = (Tfloat)(*this)(px,py,z,c), Icp = (Tfloat)(*this)(x,py,z,c), Inp = (Tfloat)(*this)(nx,py,z,c), Iap = (Tfloat)(*this)(ax,py,z,c),
        Ip = Icp + 0.5f*(dx*(-Ipp+Inp) + dx*dx*(2*Ipp-5*Icp+4*Inp-Iap) + dx*dx*dx*(-Ipp+3*Icp-3*Inp+Iap)),
        Ipc = (Tfloat)(*this)(px,y,z,c),  Icc = (Tfloat)(*this)(x, y,z,c), Inc = (Tfloat)(*this)(nx,y,z,c),  Iac = (Tfloat)(*this)(ax,y,z,c),
        Ic = Icc + 0.5f*(dx*(-Ipc+Inc) + dx*dx*(2*Ipc-5*Icc+4*Inc-Iac) + dx*dx*dx*(-Ipc+3*Icc-3*Inc+Iac)),
        Ipn = (Tfloat)(*this)(px,ny,z,c), Icn = (Tfloat)(*this)(x,ny,z,c), Inn = (Tfloat)(*this)(nx,ny,z,c), Ian = (Tfloat)(*this)(ax,ny,z,c),
        In = Icn + 0.5f*(dx*(-Ipn+Inn) + dx*dx*(2*Ipn-5*Icn+4*Inn-Ian) + dx*dx*dx*(-Ipn+3*Icn-3*Inn+Ian)),
        Ipa = (Tfloat)(*this)(px,ay,z,c), Ica = (Tfloat)(*this)(x,ay,z,c), Ina = (Tfloat)(*this)(nx,ay,z,c), Iaa = (Tfloat)(*this)(ax,ay,z,c),
        Ia = Ica + 0.5f*(dx*(-Ipa+Ina) + dx*dx*(2*Ipa-5*Ica+4*Ina-Iaa) + dx*dx*dx*(-Ipa+3*Ica-3*Ina+Iaa));
      return Ic + 0.5f*(dy*(-Ip+In) + dy*dy*(2*Ip-5*Ic+4*In-Ia) + dy*dy*dy*(-Ip+3*Ic-3*In+Ia));
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions.
    Tfloat _cubic_atXY(const float fx, const float fy, const int z, const int c,
                       const Tfloat min_val, const Tfloat max_val) const {
      const Tfloat val = _cubic_atXY(fx,fy,z,c);
      return val<min_val?min_val:val>max_val?max_val:val;
    }

    //! Read a pixel value using cubic interpolation and Dirichlet boundary conditions.
    Tfloat cubic_atXYZ(const float fx, const float fy, const float fz, const int c, const T out_val) const {
      const int
        x = (int)fx - (fx>=0?0:1), px = x - 1, nx = x + 1, ax = x + 2,
        y = (int)fy - (fy>=0?0:1), py = y - 1, ny = y + 1, ay = y + 2,
        z = (int)fz - (fz>=0?0:1), pz = z - 1, nz = z + 1, az = z + 2;
      const float dx = fx - x, dy = fy - y, dz = fz - z;
      const Tfloat
        Ippp = (Tfloat)atXYZ(px,py,pz,c,out_val), Icpp = (Tfloat)atXYZ(x,py,pz,c,out_val),
        Inpp = (Tfloat)atXYZ(nx,py,pz,c,out_val), Iapp = (Tfloat)atXYZ(ax,py,pz,c,out_val),
        Ipp = Icpp + 0.5f*(dx*(-Ippp+Inpp) + dx*dx*(2*Ippp-5*Icpp+4*Inpp-Iapp) + dx*dx*dx*(-Ippp+3*Icpp-3*Inpp+Iapp)),
        Ipcp = (Tfloat)atXYZ(px,y,pz,c,out_val),  Iccp = (Tfloat)atXYZ(x, y,pz,c,out_val),
        Incp = (Tfloat)atXYZ(nx,y,pz,c,out_val),  Iacp = (Tfloat)atXYZ(ax,y,pz,c,out_val),
        Icp = Iccp + 0.5f*(dx*(-Ipcp+Incp) + dx*dx*(2*Ipcp-5*Iccp+4*Incp-Iacp) + dx*dx*dx*(-Ipcp+3*Iccp-3*Incp+Iacp)),
        Ipnp = (Tfloat)atXYZ(px,ny,pz,c,out_val), Icnp = (Tfloat)atXYZ(x,ny,pz,c,out_val),
        Innp = (Tfloat)atXYZ(nx,ny,pz,c,out_val), Ianp = (Tfloat)atXYZ(ax,ny,pz,c,out_val),
        Inp = Icnp + 0.5f*(dx*(-Ipnp+Innp) + dx*dx*(2*Ipnp-5*Icnp+4*Innp-Ianp) + dx*dx*dx*(-Ipnp+3*Icnp-3*Innp+Ianp)),
        Ipap = (Tfloat)atXYZ(px,ay,pz,c,out_val), Icap = (Tfloat)atXYZ(x,ay,pz,c,out_val),
        Inap = (Tfloat)atXYZ(nx,ay,pz,c,out_val), Iaap = (Tfloat)atXYZ(ax,ay,pz,c,out_val),
        Iap = Icap + 0.5f*(dx*(-Ipap+Inap) + dx*dx*(2*Ipap-5*Icap+4*Inap-Iaap) + dx*dx*dx*(-Ipap+3*Icap-3*Inap+Iaap)),
        Ip = Icp + 0.5f*(dy*(-Ipp+Inp) + dy*dy*(2*Ipp-5*Icp+4*Inp-Iap) + dy*dy*dy*(-Ipp+3*Icp-3*Inp+Iap)),
        Ippc = (Tfloat)atXYZ(px,py,z,c,out_val), Icpc = (Tfloat)atXYZ(x,py,z,c,out_val),
        Inpc = (Tfloat)atXYZ(nx,py,z,c,out_val), Iapc = (Tfloat)atXYZ(ax,py,z,c,out_val),
        Ipc = Icpc + 0.5f*(dx*(-Ippc+Inpc) + dx*dx*(2*Ippc-5*Icpc+4*Inpc-Iapc) + dx*dx*dx*(-Ippc+3*Icpc-3*Inpc+Iapc)),
        Ipcc = (Tfloat)atXYZ(px,y,z,c,out_val),  Iccc = (Tfloat)atXYZ(x, y,z,c,out_val),
        Incc = (Tfloat)atXYZ(nx,y,z,c,out_val),  Iacc = (Tfloat)atXYZ(ax,y,z,c,out_val),
        Icc = Iccc + 0.5f*(dx*(-Ipcc+Incc) + dx*dx*(2*Ipcc-5*Iccc+4*Incc-Iacc) + dx*dx*dx*(-Ipcc+3*Iccc-3*Incc+Iacc)),
        Ipnc = (Tfloat)atXYZ(px,ny,z,c,out_val), Icnc = (Tfloat)atXYZ(x,ny,z,c,out_val),
        Innc = (Tfloat)atXYZ(nx,ny,z,c,out_val), Ianc = (Tfloat)atXYZ(ax,ny,z,c,out_val),
        Inc = Icnc + 0.5f*(dx*(-Ipnc+Innc) + dx*dx*(2*Ipnc-5*Icnc+4*Innc-Ianc) + dx*dx*dx*(-Ipnc+3*Icnc-3*Innc+Ianc)),
        Ipac = (Tfloat)atXYZ(px,ay,z,c,out_val), Icac = (Tfloat)atXYZ(x,ay,z,c,out_val),
        Inac = (Tfloat)atXYZ(nx,ay,z,c,out_val), Iaac = (Tfloat)atXYZ(ax,ay,z,c,out_val),
        Iac = Icac + 0.5f*(dx*(-Ipac+Inac) + dx*dx*(2*Ipac-5*Icac+4*Inac-Iaac) + dx*dx*dx*(-Ipac+3*Icac-3*Inac+Iaac)),
        Ic = Icc + 0.5f*(dy*(-Ipc+Inc) + dy*dy*(2*Ipc-5*Icc+4*Inc-Iac) + dy*dy*dy*(-Ipc+3*Icc-3*Inc+Iac)),
        Ippn = (Tfloat)atXYZ(px,py,nz,c,out_val), Icpn = (Tfloat)atXYZ(x,py,nz,c,out_val),
        Inpn = (Tfloat)atXYZ(nx,py,nz,c,out_val), Iapn = (Tfloat)atXYZ(ax,py,nz,c,out_val),
        Ipn = Icpn + 0.5f*(dx*(-Ippn+Inpn) + dx*dx*(2*Ippn-5*Icpn+4*Inpn-Iapn) + dx*dx*dx*(-Ippn+3*Icpn-3*Inpn+Iapn)),
        Ipcn = (Tfloat)atXYZ(px,y,nz,c,out_val),  Iccn = (Tfloat)atXYZ(x, y,nz,c,out_val),
        Incn = (Tfloat)atXYZ(nx,y,nz,c,out_val),  Iacn = (Tfloat)atXYZ(ax,y,nz,c,out_val),
        Icn = Iccn + 0.5f*(dx*(-Ipcn+Incn) + dx*dx*(2*Ipcn-5*Iccn+4*Incn-Iacn) + dx*dx*dx*(-Ipcn+3*Iccn-3*Incn+Iacn)),
        Ipnn = (Tfloat)atXYZ(px,ny,nz,c,out_val), Icnn = (Tfloat)atXYZ(x,ny,nz,c,out_val),
        Innn = (Tfloat)atXYZ(nx,ny,nz,c,out_val), Iann = (Tfloat)atXYZ(ax,ny,nz,c,out_val),
        Inn = Icnn + 0.5f*(dx*(-Ipnn+Innn) + dx*dx*(2*Ipnn-5*Icnn+4*Innn-Iann) + dx*dx*dx*(-Ipnn+3*Icnn-3*Innn+Iann)),
        Ipan = (Tfloat)atXYZ(px,ay,nz,c,out_val), Ican = (Tfloat)atXYZ(x,ay,nz,c,out_val),
        Inan = (Tfloat)atXYZ(nx,ay,nz,c,out_val), Iaan = (Tfloat)atXYZ(ax,ay,nz,c,out_val),
        Ian = Ican + 0.5f*(dx*(-Ipan+Inan) + dx*dx*(2*Ipan-5*Ican+4*Inan-Iaan) + dx*dx*dx*(-Ipan+3*Ican-3*Inan+Iaan)),
        In = Icn + 0.5f*(dy*(-Ipn+Inn) + dy*dy*(2*Ipn-5*Icn+4*Inn-Ian) + dy*dy*dy*(-Ipn+3*Icn-3*Inn+Ian)),
        Ippa = (Tfloat)atXYZ(px,py,az,c,out_val), Icpa = (Tfloat)atXYZ(x,py,az,c,out_val),
        Inpa = (Tfloat)atXYZ(nx,py,az,c,out_val), Iapa = (Tfloat)atXYZ(ax,py,az,c,out_val),
        Ipa = Icpa + 0.5f*(dx*(-Ippa+Inpa) + dx*dx*(2*Ippa-5*Icpa+4*Inpa-Iapa) + dx*dx*dx*(-Ippa+3*Icpa-3*Inpa+Iapa)),
        Ipca = (Tfloat)atXYZ(px,y,az,c,out_val),  Icca = (Tfloat)atXYZ(x, y,az,c,out_val),
        Inca = (Tfloat)atXYZ(nx,y,az,c,out_val),  Iaca = (Tfloat)atXYZ(ax,y,az,c,out_val),
        Ica = Icca + 0.5f*(dx*(-Ipca+Inca) + dx*dx*(2*Ipca-5*Icca+4*Inca-Iaca) + dx*dx*dx*(-Ipca+3*Icca-3*Inca+Iaca)),
        Ipna = (Tfloat)atXYZ(px,ny,az,c,out_val), Icna = (Tfloat)atXYZ(x,ny,az,c,out_val),
        Inna = (Tfloat)atXYZ(nx,ny,az,c,out_val), Iana = (Tfloat)atXYZ(ax,ny,az,c,out_val),
        Ina = Icna + 0.5f*(dx*(-Ipna+Inna) + dx*dx*(2*Ipna-5*Icna+4*Inna-Iana) + dx*dx*dx*(-Ipna+3*Icna-3*Inna+Iana)),
        Ipaa = (Tfloat)atXYZ(px,ay,az,c,out_val), Icaa = (Tfloat)atXYZ(x,ay,az,c,out_val),
        Inaa = (Tfloat)atXYZ(nx,ay,az,c,out_val), Iaaa = (Tfloat)atXYZ(ax,ay,az,c,out_val),
        Iaa = Icaa + 0.5f*(dx*(-Ipaa+Inaa) + dx*dx*(2*Ipaa-5*Icaa+4*Inaa-Iaaa) + dx*dx*dx*(-Ipaa+3*Icaa-3*Inaa+Iaaa)),
        Ia = Ica + 0.5f*(dy*(-Ipa+Ina) + dy*dy*(2*Ipa-5*Ica+4*Ina-Iaa) + dy*dy*dy*(-Ipa+3*Ica-3*Ina+Iaa));
      return Ic + 0.5f*(dz*(-Ip+In) + dz*dz*(2*Ip-5*Ic+4*In-Ia) + dz*dz*dz*(-Ip+3*Ic-3*In+Ia));
    }

    //! Read a pixel value using cubic interpolation and Dirichlet boundary conditions.
    Tfloat cubic_atXYZ(const float fx, const float fy, const float fz, const int c, const T out_val,
                       const Tfloat min_val, const Tfloat max_val) const {
      const Tfloat val = cubic_atXYZ(fx,fy,fz,c,out_val);
      return val<min_val?min_val:val>max_val?max_val:val;
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions.
    Tfloat cubic_atXYZ(const float fx, const float fy, const float fz, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "cubic_atXYZ() : Empty instance.",
                                    cimg_instance);

      return _cubic_atXYZ(fx,fy,fz,c);
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions.
    Tfloat cubic_atXYZ(const float fx, const float fy, const float fz, const int c,
                       const Tfloat min_val, const Tfloat max_val) const {
      const Tfloat val = cubic_atXYZ(fx,fy,fz,c);
      return val<min_val?min_val:val>max_val?max_val:val;
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions.
    Tfloat _cubic_atXYZ(const float fx, const float fy, const float fz, const int c=0) const {
      const float
        nfx = fx<0?0:(fx>_width-1?_width-1:fx),
        nfy = fy<0?0:(fy>_height-1?_height-1:fy),
        nfz = fz<0?0:(fz>_depth-1?_depth-1:fz);
      const int x = (int)nfx, y = (int)nfy, z = (int)nfz;
      const float dx = nfx - x, dy = nfy - y, dz = nfz - z;
      const int
        px = x-1<0?0:x-1, nx = dx>0?x+1:x, ax = x+2>=width()?width()-1:x+2,
        py = y-1<0?0:y-1, ny = dy>0?y+1:y, ay = y+2>=height()?height()-1:y+2,
        pz = z-1<0?0:z-1, nz = dz>0?z+1:z, az = z+2>=depth()?depth()-1:z+2;
      const Tfloat
        Ippp = (Tfloat)(*this)(px,py,pz,c), Icpp = (Tfloat)(*this)(x,py,pz,c),
        Inpp = (Tfloat)(*this)(nx,py,pz,c), Iapp = (Tfloat)(*this)(ax,py,pz,c),
        Ipp = Icpp + 0.5f*(dx*(-Ippp+Inpp) + dx*dx*(2*Ippp-5*Icpp+4*Inpp-Iapp) + dx*dx*dx*(-Ippp+3*Icpp-3*Inpp+Iapp)),
        Ipcp = (Tfloat)(*this)(px,y,pz,c),  Iccp = (Tfloat)(*this)(x, y,pz,c),
        Incp = (Tfloat)(*this)(nx,y,pz,c),  Iacp = (Tfloat)(*this)(ax,y,pz,c),
        Icp = Iccp + 0.5f*(dx*(-Ipcp+Incp) + dx*dx*(2*Ipcp-5*Iccp+4*Incp-Iacp) + dx*dx*dx*(-Ipcp+3*Iccp-3*Incp+Iacp)),
        Ipnp = (Tfloat)(*this)(px,ny,pz,c), Icnp = (Tfloat)(*this)(x,ny,pz,c),
        Innp = (Tfloat)(*this)(nx,ny,pz,c), Ianp = (Tfloat)(*this)(ax,ny,pz,c),
        Inp = Icnp + 0.5f*(dx*(-Ipnp+Innp) + dx*dx*(2*Ipnp-5*Icnp+4*Innp-Ianp) + dx*dx*dx*(-Ipnp+3*Icnp-3*Innp+Ianp)),
        Ipap = (Tfloat)(*this)(px,ay,pz,c), Icap = (Tfloat)(*this)(x,ay,pz,c),
        Inap = (Tfloat)(*this)(nx,ay,pz,c), Iaap = (Tfloat)(*this)(ax,ay,pz,c),
        Iap = Icap + 0.5f*(dx*(-Ipap+Inap) + dx*dx*(2*Ipap-5*Icap+4*Inap-Iaap) + dx*dx*dx*(-Ipap+3*Icap-3*Inap+Iaap)),
        Ip = Icp + 0.5f*(dy*(-Ipp+Inp) + dy*dy*(2*Ipp-5*Icp+4*Inp-Iap) + dy*dy*dy*(-Ipp+3*Icp-3*Inp+Iap)),
        Ippc = (Tfloat)(*this)(px,py,z,c), Icpc = (Tfloat)(*this)(x,py,z,c),
        Inpc = (Tfloat)(*this)(nx,py,z,c), Iapc = (Tfloat)(*this)(ax,py,z,c),
        Ipc = Icpc + 0.5f*(dx*(-Ippc+Inpc) + dx*dx*(2*Ippc-5*Icpc+4*Inpc-Iapc) + dx*dx*dx*(-Ippc+3*Icpc-3*Inpc+Iapc)),
        Ipcc = (Tfloat)(*this)(px,y,z,c),  Iccc = (Tfloat)(*this)(x, y,z,c),
        Incc = (Tfloat)(*this)(nx,y,z,c),  Iacc = (Tfloat)(*this)(ax,y,z,c),
        Icc = Iccc + 0.5f*(dx*(-Ipcc+Incc) + dx*dx*(2*Ipcc-5*Iccc+4*Incc-Iacc) + dx*dx*dx*(-Ipcc+3*Iccc-3*Incc+Iacc)),
        Ipnc = (Tfloat)(*this)(px,ny,z,c), Icnc = (Tfloat)(*this)(x,ny,z,c),
        Innc = (Tfloat)(*this)(nx,ny,z,c), Ianc = (Tfloat)(*this)(ax,ny,z,c),
        Inc = Icnc + 0.5f*(dx*(-Ipnc+Innc) + dx*dx*(2*Ipnc-5*Icnc+4*Innc-Ianc) + dx*dx*dx*(-Ipnc+3*Icnc-3*Innc+Ianc)),
        Ipac = (Tfloat)(*this)(px,ay,z,c), Icac = (Tfloat)(*this)(x,ay,z,c),
        Inac = (Tfloat)(*this)(nx,ay,z,c), Iaac = (Tfloat)(*this)(ax,ay,z,c),
        Iac = Icac + 0.5f*(dx*(-Ipac+Inac) + dx*dx*(2*Ipac-5*Icac+4*Inac-Iaac) + dx*dx*dx*(-Ipac+3*Icac-3*Inac+Iaac)),
        Ic = Icc + 0.5f*(dy*(-Ipc+Inc) + dy*dy*(2*Ipc-5*Icc+4*Inc-Iac) + dy*dy*dy*(-Ipc+3*Icc-3*Inc+Iac)),
        Ippn = (Tfloat)(*this)(px,py,nz,c), Icpn = (Tfloat)(*this)(x,py,nz,c),
        Inpn = (Tfloat)(*this)(nx,py,nz,c), Iapn = (Tfloat)(*this)(ax,py,nz,c),
        Ipn = Icpn + 0.5f*(dx*(-Ippn+Inpn) + dx*dx*(2*Ippn-5*Icpn+4*Inpn-Iapn) + dx*dx*dx*(-Ippn+3*Icpn-3*Inpn+Iapn)),
        Ipcn = (Tfloat)(*this)(px,y,nz,c),  Iccn = (Tfloat)(*this)(x, y,nz,c),
        Incn = (Tfloat)(*this)(nx,y,nz,c),  Iacn = (Tfloat)(*this)(ax,y,nz,c),
        Icn = Iccn + 0.5f*(dx*(-Ipcn+Incn) + dx*dx*(2*Ipcn-5*Iccn+4*Incn-Iacn) + dx*dx*dx*(-Ipcn+3*Iccn-3*Incn+Iacn)),
        Ipnn = (Tfloat)(*this)(px,ny,nz,c), Icnn = (Tfloat)(*this)(x,ny,nz,c),
        Innn = (Tfloat)(*this)(nx,ny,nz,c), Iann = (Tfloat)(*this)(ax,ny,nz,c),
        Inn = Icnn + 0.5f*(dx*(-Ipnn+Innn) + dx*dx*(2*Ipnn-5*Icnn+4*Innn-Iann) + dx*dx*dx*(-Ipnn+3*Icnn-3*Innn+Iann)),
        Ipan = (Tfloat)(*this)(px,ay,nz,c), Ican = (Tfloat)(*this)(x,ay,nz,c),
        Inan = (Tfloat)(*this)(nx,ay,nz,c), Iaan = (Tfloat)(*this)(ax,ay,nz,c),
        Ian = Ican + 0.5f*(dx*(-Ipan+Inan) + dx*dx*(2*Ipan-5*Ican+4*Inan-Iaan) + dx*dx*dx*(-Ipan+3*Ican-3*Inan+Iaan)),
        In = Icn + 0.5f*(dy*(-Ipn+Inn) + dy*dy*(2*Ipn-5*Icn+4*Inn-Ian) + dy*dy*dy*(-Ipn+3*Icn-3*Inn+Ian)),
        Ippa = (Tfloat)(*this)(px,py,az,c), Icpa = (Tfloat)(*this)(x,py,az,c),
        Inpa = (Tfloat)(*this)(nx,py,az,c), Iapa = (Tfloat)(*this)(ax,py,az,c),
        Ipa = Icpa + 0.5f*(dx*(-Ippa+Inpa) + dx*dx*(2*Ippa-5*Icpa+4*Inpa-Iapa) + dx*dx*dx*(-Ippa+3*Icpa-3*Inpa+Iapa)),
        Ipca = (Tfloat)(*this)(px,y,az,c),  Icca = (Tfloat)(*this)(x, y,az,c),
        Inca = (Tfloat)(*this)(nx,y,az,c),  Iaca = (Tfloat)(*this)(ax,y,az,c),
        Ica = Icca + 0.5f*(dx*(-Ipca+Inca) + dx*dx*(2*Ipca-5*Icca+4*Inca-Iaca) + dx*dx*dx*(-Ipca+3*Icca-3*Inca+Iaca)),
        Ipna = (Tfloat)(*this)(px,ny,az,c), Icna = (Tfloat)(*this)(x,ny,az,c),
        Inna = (Tfloat)(*this)(nx,ny,az,c), Iana = (Tfloat)(*this)(ax,ny,az,c),
        Ina = Icna + 0.5f*(dx*(-Ipna+Inna) + dx*dx*(2*Ipna-5*Icna+4*Inna-Iana) + dx*dx*dx*(-Ipna+3*Icna-3*Inna+Iana)),
        Ipaa = (Tfloat)(*this)(px,ay,az,c), Icaa = (Tfloat)(*this)(x,ay,az,c),
        Inaa = (Tfloat)(*this)(nx,ay,az,c), Iaaa = (Tfloat)(*this)(ax,ay,az,c),
        Iaa = Icaa + 0.5f*(dx*(-Ipaa+Inaa) + dx*dx*(2*Ipaa-5*Icaa+4*Inaa-Iaaa) + dx*dx*dx*(-Ipaa+3*Icaa-3*Inaa+Iaaa)),
        Ia = Ica + 0.5f*(dy*(-Ipa+Ina) + dy*dy*(2*Ipa-5*Ica+4*Ina-Iaa) + dy*dy*dy*(-Ipa+3*Ica-3*Ina+Iaa));
      return Ic + 0.5f*(dz*(-Ip+In) + dz*dz*(2*Ip-5*Ic+4*In-Ia) + dz*dz*dz*(-Ip+3*Ic-3*In+Ia));
    }

    //! Read a pixel value using cubic interpolation and Neumann boundary conditions.
    Tfloat _cubic_atXYZ(const float fx, const float fy, const float fz, const int c,
                        const Tfloat min_val, const Tfloat max_val) const {
      const Tfloat val = _cubic_atXYZ(fx,fy,fz,c);
      return val<min_val?min_val:val>max_val?max_val:val;
    }

    //! Set a pixel value, with 3d float coordinates, using linear interpolation.
    CImg<T>& set_linear_atXYZ(const T& val, const float fx, const float fy=0, const float fz=0, const int c=0,
                              const bool add=false) {
      const int
        x = (int)fx - (fx>=0?0:1), nx = x + 1,
        y = (int)fy - (fy>=0?0:1), ny = y + 1,
        z = (int)fz - (fz>=0?0:1), nz = z + 1;
      const float
        dx = fx - x,
        dy = fy - y,
        dz = fz - z;
      if (c>=0 && c<spectrum()) {
        if (z>=0 && z<depth()) {
          if (y>=0 && y<height()) {
            if (x>=0 && x<width()) {
              const float w1 = (1-dx)*(1-dy)*(1-dz), w2 = add?1:(1-w1);
              (*this)(x,y,z,c) = (T)(w1*val + w2*(*this)(x,y,z,c));
            }
            if (nx>=0 && nx<width()) {
              const float w1 = dx*(1-dy)*(1-dz), w2 = add?1:(1-w1);
              (*this)(nx,y,z,c) = (T)(w1*val + w2*(*this)(nx,y,z,c));
            }
          }
          if (ny>=0 && ny<height()) {
            if (x>=0 && x<width()) {
              const float w1 = (1-dx)*dy*(1-dz), w2 = add?1:(1-w1);
              (*this)(x,ny,z,c) = (T)(w1*val + w2*(*this)(x,ny,z,c));
            }
            if (nx>=0 && nx<width()) {
              const float w1 = dx*dy*(1-dz), w2 = add?1:(1-w1);
              (*this)(nx,ny,z,c) = (T)(w1*val + w2*(*this)(nx,ny,z,c));
            }
          }
        }
        if (nz>=0 && nz<depth()) {
          if (y>=0 && y<height()) {
            if (x>=0 && x<width()) {
              const float w1 = (1-dx)*(1-dy), w2 = add?1:(1-w1);
              (*this)(x,y,nz,c) = (T)(w1*val + w2*(*this)(x,y,nz,c));
            }
            if (nx>=0 && nx<width()) {
              const float w1 = dx*(1-dy), w2 = add?1:(1-w1);
              (*this)(nx,y,nz,c) = (T)(w1*val + w2*(*this)(nx,y,nz,c));
            }
          }
          if (ny>=0 && ny<height()) {
            if (x>=0 && x<width()) {
              const float w1 = (1-dx)*dy, w2 = add?1:(1-w1);
              (*this)(x,ny,nz,c) = (T)(w1*val + w2*(*this)(x,ny,nz,c));
            }
            if (nx>=0 && nx<width()) {
              const float w1 = dx*dy, w2 = add?1:(1-w1);
              (*this)(nx,ny,nz,c) = (T)(w1*val + w2*(*this)(nx,ny,nz,c));
            }
          }
        }
      }
      return *this;
    }

    //! Set a pixel value, with 2d float coordinates, using linear interpolation.
    CImg<T>& set_linear_atXY(const T& val, const float fx, const float fy=0, const int z=0, const int c=0,
                             const bool add=false) {
      const int
        x = (int)fx - (fx>=0?0:1), nx = x + 1,
        y = (int)fy - (fy>=0?0:1), ny = y + 1;
      const float
        dx = fx - x,
        dy = fy - y;
      if (z>=0 && z<depth() && c>=0 && c<spectrum()) {
        if (y>=0 && y<height()) {
          if (x>=0 && x<width()) {
            const float w1 = (1-dx)*(1-dy), w2 = add?1:(1-w1);
            (*this)(x,y,z,c) = (T)(w1*val + w2*(*this)(x,y,z,c));
          }
          if (nx>=0 && nx<width()) {
            const float w1 = dx*(1-dy), w2 = add?1:(1-w1);
            (*this)(nx,y,z,c) = (T)(w1*val + w2*(*this)(nx,y,z,c));
          }
        }
        if (ny>=0 && ny<height()) {
          if (x>=0 && x<width()) {
            const float w1 = (1-dx)*dy, w2 = add?1:(1-w1);
            (*this)(x,ny,z,c) = (T)(w1*val + w2*(*this)(x,ny,z,c));
          }
          if (nx>=0 && nx<width()) {
            const float w1 = dx*dy, w2 = add?1:(1-w1);
            (*this)(nx,ny,z,c) = (T)(w1*val + w2*(*this)(nx,ny,z,c));
          }
        }
      }
      return *this;
    }

    //! Return a C-string containing the values of the instance image.
    CImg<charT> value_string(const char separator=',', const unsigned int max_size=0) const {
      if (is_empty()) return CImg<charT>(1,1,1,1,0);
      const unsigned int siz = (unsigned int)size();
      CImgList<charT> items;
      char item[256] = { 0 };
      const T *ptrs = _data;
      for (unsigned int off = 0; off<siz-1; ++off) {
        cimg_snprintf(item,sizeof(item),cimg::type<T>::format(),cimg::type<T>::format(*(ptrs++)));
        const unsigned int l = std::strlen(item);
        CImg<charT>(item,l+1).move_to(items).back()[l] = separator;
      }
      cimg_snprintf(item,sizeof(item),cimg::type<T>::format(),cimg::type<T>::format(*ptrs));
      CImg<charT>(item,std::strlen(item)+1).move_to(items);
      CImg<ucharT> res; (items>'x').move_to(res);
      if (max_size) { res.crop(0,max_size); res(max_size) = 0; }
      return res;
    }

    //@}
    //-------------------------------------
    //
    //! \name Instance Checking
    //@{
    //-------------------------------------

    //! Return \c true if current image has shared memory.
    bool is_shared() const {
      return _is_shared;
    }

    //! Return \c true if current image is empty.
    bool is_empty() const {
      return !(_data && _width && _height && _depth && _spectrum);
    }

    //! Return \c true if image (*this) has the specified width.
    bool is_sameX(const unsigned int dx) const {
      return (_width==dx);
    }

    //! Return \c true if images \c (*this) and \c img have same width.
    template<typename t>
    bool is_sameX(const CImg<t>& img) const {
      return is_sameX(img._width);
    }

    //! Return \c true if images \c (*this) and the display \c disp have same width.
    bool is_sameX(const CImgDisplay& disp) const {
      return is_sameX((unsigned int)disp.width());
    }

    //! Return \c true if image (*this) has the specified height.
    bool is_sameY(const unsigned int dy) const {
      return (_height==dy);
    }

    //! Return \c true if images \c (*this) and \c img have same height.
    template<typename t>
    bool is_sameY(const CImg<t>& img) const {
      return is_sameY(img._height);
    }

    //! Return \c true if images \c (*this) and the display \c disp have same height.
    bool is_sameY(const CImgDisplay& disp) const {
      return is_sameY((unsigned int)disp.height());
    }

    //! Return \c true if image (*this) has the specified depth.
    bool is_sameZ(const unsigned int dz) const {
      return (_depth==dz);
    }

    //! Return \c true if images \c (*this) and \c img have same depth.
    template<typename t>
    bool is_sameZ(const CImg<t>& img) const {
      return is_sameZ(img._depth);
    }

    //! Return \c true if image (*this) has the specified number of channels.
    bool is_sameC(const unsigned int dc) const {
      return (_spectrum==dc);
    }

    //! Return \c true if images \c (*this) and \c img have same _spectrum.
    template<typename t>
    bool is_sameC(const CImg<t>& img) const {
      return is_sameC(img._spectrum);
    }

    //! Return \c true if image (*this) has the specified width and height.
    bool is_sameXY(const unsigned int dx, const unsigned int dy) const {
      return (is_sameX(dx) && is_sameY(dy));
    }

    //! Return \c true if images have same width and same height.
    template<typename t>
    bool is_sameXY(const CImg<t>& img) const {
      return (is_sameX(img) && is_sameY(img));
    }

    //! Return \c true if image \c (*this) and the display \c disp have same width and same height.
    bool is_sameXY(const CImgDisplay& disp) const {
      return (is_sameX(disp) && is_sameY(disp));
    }

    //! Return \c true if image (*this) has the specified width and depth.
    bool is_sameXZ(const unsigned int dx, const unsigned int dz) const {
      return (is_sameX(dx) && is_sameZ(dz));
    }

    //! Return \c true if images have same width and same depth.
    template<typename t>
    bool is_sameXZ(const CImg<t>& img) const {
      return (is_sameX(img) && is_sameZ(img));
    }

    //! Return \c true if image (*this) has the specified width and number of channels.
    bool is_sameXC(const unsigned int dx, const unsigned int dc) const {
      return (is_sameX(dx) && is_sameC(dc));
    }

    //! Return \c true if images have same width and same number of channels.
    template<typename t>
    bool is_sameXC(const CImg<t>& img) const {
      return (is_sameX(img) && is_sameC(img));
    }

    //! Return \c true if image (*this) has the specified height and depth.
    bool is_sameYZ(const unsigned int dy, const unsigned int dz) const {
      return (is_sameY(dy) && is_sameZ(dz));
    }

    //! Return \c true if images have same height and same depth.
    template<typename t>
    bool is_sameYZ(const CImg<t>& img) const {
      return (is_sameY(img) && is_sameZ(img));
    }

    //! Return \c true if image (*this) has the specified height and number of channels.
    bool is_sameYC(const unsigned int dy, const unsigned int dc) const {
      return (is_sameY(dy) && is_sameC(dc));
    }

    //! Return \c true if images have same height and same number of channels.
    template<typename t>
    bool is_sameYC(const CImg<t>& img) const {
      return (is_sameY(img) && is_sameC(img));
    }

    //! Return \c true if image (*this) has the specified depth and number of channels.
    bool is_sameZC(const unsigned int dz, const unsigned int dc) const {
      return (is_sameZ(dz) && is_sameC(dc));
    }

    //! Return \c true if images have same depth and same number of channels.
    template<typename t>
    bool is_sameZC(const CImg<t>& img) const {
      return (is_sameZ(img) && is_sameC(img));
    }

    //! Return \c true if image (*this) has the specified width, height and depth.
    bool is_sameXYZ(const unsigned int dx, const unsigned int dy, const unsigned int dz) const {
      return (is_sameXY(dx,dy) && is_sameZ(dz));
    }

    //! Return \c true if images have same width, same height and same depth.
    template<typename t>
    bool is_sameXYZ(const CImg<t>& img) const {
      return (is_sameXY(img) && is_sameZ(img));
    }

    //! Return \c true if image (*this) has the specified width, height and depth.
    bool is_sameXYC(const unsigned int dx, const unsigned int dy, const unsigned int dc) const {
      return (is_sameXY(dx,dy) && is_sameC(dc));
    }

    //! Return \c true if images have same width, same height and same number of channels.
    template<typename t>
    bool is_sameXYC(const CImg<t>& img) const {
      return (is_sameXY(img) && is_sameC(img));
    }

    //! Return \c true if image (*this) has the specified width, height and number of channels.
    bool is_sameXZC(const unsigned int dx, const unsigned int dz, const unsigned int dc) const {
      return (is_sameXZ(dx,dz) && is_sameC(dc));
    }

    //! Return \c true if images have same width, same depth and same number of channels.
    template<typename t>
    bool is_sameXZC(const CImg<t>& img) const {
      return (is_sameXZ(img) && is_sameC(img));
    }

    //! Return \c true if image (*this) has the specified height, depth and number of channels.
    bool is_sameYZC(const unsigned int dy, const unsigned int dz, const unsigned int dc) const {
      return (is_sameYZ(dy,dz) && is_sameC(dc));
    }

    //! Return \c true if images have same heigth, same depth and same number of channels.
    template<typename t>
    bool is_sameYZC(const CImg<t>& img) const {
      return (is_sameYZ(img) && is_sameC(img));
    }

    //! Return \c true if image (*this) has the specified width, height, depth and number of channels.
    bool is_sameXYZC(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc) const {
      return (is_sameXYZ(dx,dy,dz) && is_sameC(dc));
    }

    //! Return \c true if images \c (*this) and \c img have same width, same height, same depth and same number of channels.
    template<typename t>
    bool is_sameXYZC(const CImg<t>& img) const {
      return (is_sameXYZ(img) && is_sameC(img));
    }

    //! Return \c true if pixel (x,y,z,c) is inside image boundaries.
    bool containsXYZC(const int x, const int y=0, const int z=0, const int c=0) const {
      return !is_empty() && x>=0 && x<width() && y>=0 && y<height() && z>=0 && z<depth() && c>=0 && c<spectrum();
    }

    //! Return \c true if specified referenced value is inside image boundaries. If true, returns pixel coordinates in (x,y,z,c).
    template<typename t>
    bool contains(const T& pixel, t& x, t& y, t& z, t& c) const {
      const unsigned int wh = _width*_height, whd = wh*_depth, siz = whd*_spectrum;
      const T *const ppixel = &pixel;
      if (is_empty() || ppixel<_data || ppixel>=_data+siz) return false;
      unsigned int off = (unsigned int)(ppixel - _data);
      const unsigned int nc = off/whd;
      off%=whd;
      const unsigned int nz = off/wh;
      off%=wh;
      const unsigned int ny = off/_width, nx = off%_width;
      x = (t)nx; y = (t)ny; z = (t)nz; c = (t)nc;
      return true;
    }

    //! Return \c true if specified referenced value is inside image boundaries. If true, returns pixel coordinates in (x,y,z).
    template<typename t>
    bool contains(const T& pixel, t& x, t& y, t& z) const {
      const unsigned int wh = _width*_height, whd = wh*_depth, siz = whd*_spectrum;
      const T *const ppixel = &pixel;
      if (is_empty() || ppixel<_data || ppixel>=_data+siz) return false;
      unsigned int off = ((unsigned int)(ppixel - _data))%whd;
      const unsigned int nz = off/wh;
      off%=wh;
      const unsigned int ny = off/_width, nx = off%_width;
      x = (t)nx; y = (t)ny; z = (t)nz;
      return true;
    }

    //! Return \c true if specified referenced value is inside image boundaries. If true, returns pixel coordinates in (x,y).
    template<typename t>
    bool contains(const T& pixel, t& x, t& y) const {
      const unsigned int wh = _width*_height, siz = wh*_depth*_spectrum;
      const T *const ppixel = &pixel;
      if (is_empty() || ppixel<_data || ppixel>=_data+siz) return false;
      unsigned int off = ((unsigned int)(ppixel - _data))%wh;
      const unsigned int ny = off/_width, nx = off%_width;
      x = (t)nx; y = (t)ny;
      return true;
    }

    //! Return \c true if specified referenced value is inside image boundaries. If true, returns pixel coordinates in (x).
    template<typename t>
    bool contains(const T& pixel, t& x) const {
      const T *const ppixel = &pixel;
      if (is_empty() || ppixel<_data || ppixel>=_data+size()) return false;
      x = (t)(((unsigned int)(ppixel - _data))%_width);
      return true;
    }

    //! Return \c true if specified referenced value is inside the image boundaries.
    bool contains(const T& pixel) const {
      const T *const ppixel = &pixel;
      return !is_empty() && ppixel>=_data && ppixel<_data + size();
    }

    //! Return \c true if the memory buffers of the two images overlaps.
    template<typename t>
    bool is_overlapped(const CImg<t>& img) const {
      const unsigned int csiz = size(), isiz = img.size();
      return !((void*)(_data + csiz)<=(void*)img._data || (void*)_data>=(void*)(img._data + isiz));
    }

    //! Return true if the set (instance,primitives,colors,opacities) stands for a valid 3d object.
    template<typename tp, typename tc, typename to>
    bool is_object3d(const CImgList<tp>& primitives,
                     const CImgList<tc>& colors,
                     const to& opacities,
                     const bool full_check=true,
                     char *const error_message=0) const {
      if (error_message) *error_message = 0;

      // Check consistency for the particular case of an empty 3d object.
      if (is_empty()) {
        if (primitives || colors || opacities) {
          if (error_message) std::sprintf(error_message,
                                          "3d object has no vertices but %u primitives, %u colors and %u opacities",
                                          primitives._width,colors._width,opacities.size());
          return false;
        }
        return true;
      }

      // Check consistency of vertices.
      if (_height!=3 || _depth>1 || _spectrum>1) { // Check vertices dimensions.
        if (error_message) std::sprintf(error_message,
                                        "3d object (%u,%u) has invalid vertices dimensions (%u,%u,%u,%u)",
                                        _width,primitives._width,_width,_height,_depth,_spectrum);
        return false;
      }
      if (colors._width>primitives._width+1) {
        if (error_message) std::sprintf(error_message,
                                        "3d object (%u,%u) defines %u colors",
                                        _width,primitives._width,colors._width);
        return false;
      }
      if (opacities.size()>primitives._width) {
        if (error_message) std::sprintf(error_message,
                                        "3d object (%u,%u) defines %u opacities",
                                        _width,primitives._width,opacities.size());
        return false;
      }
      if (!full_check) return true;

      // Check consistency of primitives.
      cimglist_for(primitives,l) {
        const CImg<tp>& primitive = primitives[l];
        const unsigned int psiz = primitive.size();
        switch (psiz) {
        case 1 : { // Point.
          const unsigned int i0 = (unsigned int)primitive(0);
          if (i0>=_width) {
            if (error_message) std::sprintf(error_message,
                                            "3d object (%u,%u) refers to invalid vertex indice %u in point primitive %u",
                                            _width,primitives._width,i0,l);
            return false;
          }
        } break;
        case 5 : { // Sphere.
          const unsigned int
            i0 = (unsigned int)primitive(0),
            i1 = (unsigned int)primitive(1);
          if (i0>=_width || i1>=_width) {
            if (error_message) std::sprintf(error_message,
                                            "3d object (%u,%u) refers to invalid vertex indices (%u,%u) in sphere primitive %u",
                                            _width,primitives._width,i0,i1,l);
            return false;
          }
        } break;
        case 2 : // Segment.
        case 6 : {
          const unsigned int
            i0 = (unsigned int)primitive(0),
            i1 = (unsigned int)primitive(1);
          if (i0>=_width || i1>=_width) {
            if (error_message) std::sprintf(error_message,
                                            "3d object (%u,%u) refers to invalid vertex indices (%u,%u) in segment primitive %u",
                                            _width,primitives._width,i0,i1,l);
            return false;
          }
        } break;
        case 3 : // Triangle.
        case 9 : {
          const unsigned int
            i0 = (unsigned int)primitive(0),
            i1 = (unsigned int)primitive(1),
            i2 = (unsigned int)primitive(2);
          if (i0>=_width || i1>=_width || i2>=_width) {
            if (error_message) std::sprintf(error_message,
                                            "3d object (%u,%u) refers to invalid vertex indices (%u,%u,%u) in triangle primitive %u",
                                            _width,primitives._width,i0,i1,i2,l);
            return false;
          }
        } break;
        case 4 : // Quadrangle.
        case 12 : {
          const unsigned int
            i0 = (unsigned int)primitive(0),
            i1 = (unsigned int)primitive(1),
            i2 = (unsigned int)primitive(2),
            i3 = (unsigned int)primitive(3);
          if (i0>=_width || i1>=_width || i2>=_width || i3>=_width) {
            if (error_message) std::sprintf(error_message,
                                            "3d object (%u,%u) refers to invalid vertex indices (%u,%u,%u,%u) in quadrangle primitive %u",
                                            _width,primitives._width,i0,i1,i2,i3,l);
            return false;
          }
        } break;
        default :
          if (error_message) std::sprintf(error_message,
                                          "3d object has invalid primitive %u of size %u",
                                          l,psiz);
          return false;
        }
      }

      // Check consistency of colors.
      cimglist_for(colors,c) {
        const CImg<tc>& color = colors[c];
        if (!color) {
          if (error_message) std::sprintf(error_message,
                                          "3d object has empty color for primitive %u",
                                          c);
          return false;
        }
      }

      // Check consistency of light texture.
      if (colors._width>primitives._width) {
        const CImg<tc> &light = colors.back();
        if (!light || light._depth>1) {
          if (error_message) std::sprintf(error_message,
                                          "3d object has invalid light texture (%u,%u,%u,%u)",
                                          light._width,light._height,light._depth,light._spectrum);
          return false;
        }
      }

      return true;
    }

    //! Test if an image is a valid CImg3d object.
    bool is_CImg3d(const bool full_check=true, char *const error_message=0) const {
      if (error_message) *error_message = 0;

      // Check instance dimension and header.
      if (_width!=1 || _height<8 || _depth!=1 || _spectrum!=1) {
        if (error_message) std::sprintf(error_message,
                                        "CImg3d has invalid dimensions (%u,%u,%u,%u)",
                                        _width,_height,_depth,_spectrum);
        return false;
      }
      const T *ptrs = _data, *const ptre = end();
      if (!_is_CImg3d(*(ptrs++),'C') || !_is_CImg3d(*(ptrs++),'I') || !_is_CImg3d(*(ptrs++),'m') ||
          !_is_CImg3d(*(ptrs++),'g') || !_is_CImg3d(*(ptrs++),'3') || !_is_CImg3d(*(ptrs++),'d')) {
        if (error_message) std::sprintf(error_message,
                                        "CImg3d header not found");
        return false;
      }
      const unsigned int
        nb_points = cimg::float2uint((float)*(ptrs++)),
        nb_primitives = cimg::float2uint((float)*(ptrs++));

      // Check consistency of vertex data.
      if (!nb_points) {
        if (nb_primitives) {
          if (error_message) std::sprintf(error_message,
                                          "CImg3d has no vertices but %u primitives",
                                          nb_primitives);
          return false;
        }
        if (ptrs!=ptre) {
          if (error_message) std::sprintf(error_message,
                                          "CImg3d (%u,%u) is empty but contains %u byte%s more than expected",
                                          nb_points,nb_primitives,(unsigned int)(ptre-ptrs),(ptre-ptrs)>1?"s":"");
          return false;
        }
        return true;
      }
      ptrs+=3*nb_points;
      if (ptrs>ptre) {
        if (error_message) std::sprintf(error_message,
                                        "CImg3d (%u,%u) has incomplete vertex data",
                                        nb_points,nb_primitives);
        return false;
      }
      if (!full_check) return true;

      // Check consistency of primitive data.
      if (ptrs==ptre) {
        if (error_message) std::sprintf(error_message,
                                        "CImg3d (%u,%u) has no primitive data",
                                        nb_points,nb_primitives);
        return false;
      }
      for (unsigned int p = 0; p<nb_primitives; ++p) {
        const unsigned int nb_inds = (unsigned int)*(ptrs++);
        switch (nb_inds) {
        case 1 : { // Point.
          const unsigned int i0 = cimg::float2uint((float)*(ptrs++));
          if (i0>=nb_points) {
            if (error_message) std::sprintf(error_message,
                                            "CImg3d (%u,%u) refers to invalid vertex indice %u in point primitive %u",
                                            nb_points,nb_primitives,i0,p);
            return false;
          }
        } break;
        case 5 : { // Sphere.
          const unsigned int
            i0 = cimg::float2uint((float)*(ptrs++)),
            i1 = cimg::float2uint((float)*(ptrs++));
          ptrs+=3;
          if (i0>=nb_points || i1>=nb_points) {
            if (error_message) std::sprintf(error_message,
                                            "CImg3d (%u,%u) refers to invalid vertex indices (%u,%u) in sphere primitive %u",
                                            nb_points,nb_primitives,i0,i1,p);
            return false;
          }
        } break;
        case 2 : case 6 : { // Segment.
          const unsigned int
            i0 = cimg::float2uint((float)*(ptrs++)),
            i1 = cimg::float2uint((float)*(ptrs++));
          if (nb_inds==6) ptrs+=4;
          if (i0>=nb_points || i1>=nb_points) {
            if (error_message) std::sprintf(error_message,
                                            "CImg3d (%u,%u) refers to invalid vertex indices (%u,%u) in segment primitive %u",
                                            nb_points,nb_primitives,i0,i1,p);
            return false;
          }
        } break;
        case 3 : case 9 : { // Triangle.
          const unsigned int
            i0 = cimg::float2uint((float)*(ptrs++)),
            i1 = cimg::float2uint((float)*(ptrs++)),
            i2 = cimg::float2uint((float)*(ptrs++));
          if (nb_inds==9) ptrs+=6;
          if (i0>=nb_points || i1>=nb_points || i2>=nb_points) {
            if (error_message) std::sprintf(error_message,
                                            "CImg3d (%u,%u) refers to invalid vertex indices (%u,%u,%u) in triangle primitive %u",
                                            nb_points,nb_primitives,i0,i1,i2,p);
            return false;
          }
        } break;
        case 4 : case 12 : { // Quadrangle.
          const unsigned int
            i0 = cimg::float2uint((float)*(ptrs++)),
            i1 = cimg::float2uint((float)*(ptrs++)),
            i2 = cimg::float2uint((float)*(ptrs++)),
            i3 = cimg::float2uint((float)*(ptrs++));
          if (nb_inds==12) ptrs+=8;
          if (i0>=nb_points || i1>=nb_points || i2>=nb_points || i3>=nb_points) {
            if (error_message) std::sprintf(error_message,
                                            "CImg3d (%u,%u) refers to invalid vertex indices (%u,%u,%u,%u) in quadrangle primitive %u",
                                            nb_points,nb_primitives,i0,i1,i2,i3,p);
            return false;
          }
        } break;
        default :
          if (error_message) std::sprintf(error_message,
                                          "CImg3d (%u,%u) has invalid primitive %u of size %u",
                                          nb_points,nb_primitives,p,nb_inds);
          return false;
        }
        if (ptrs>ptre) {
          if (error_message) std::sprintf(error_message,
                                          "CImg3d (%u,%u) has incomplete primitive data for primitive %u",
                                          nb_points,nb_primitives,p);
          return false;
        }
      }

      // Check consistency of color data.
      if (ptrs==ptre) {
        if (error_message) std::sprintf(error_message,
                                        "CImg3d (%u,%u) has no color/texture data",
                                        nb_points,nb_primitives);
        return false;
      }
      for (unsigned int c = 0; c<nb_primitives; ++c) {
        if ((int)*(ptrs++)!=-128) ptrs+=2;
        else if ((ptrs+=3)<ptre) {
          const unsigned int w = (unsigned int)*(ptrs-3), h = (unsigned int)*(ptrs-2), s = (unsigned int)*(ptrs-1);
          if (!h && !s) {
            if (w>=c) {
              if (error_message) std::sprintf(error_message,
                                              "CImg3d (%u,%u) refers to invalid shared sprite/texture indice %u for primitive %u",
                                              nb_points,nb_primitives,w,c);
              return false;
            }
          } else ptrs+=w*h*s;
        }
        if (ptrs>ptre) {
          if (error_message) std::sprintf(error_message,
                                          "CImg3d (%u,%u) has incomplete color/texture data for primitive %u",
                                          nb_points,nb_primitives,c);
          return false;
        }
      }

      // Check consistency of opacity data.
      if (ptrs==ptre) {
        if (error_message) std::sprintf(error_message,
                                        "CImg3d (%u,%u) has no opacity data",
                                        nb_points,nb_primitives);
        return false;
      }
      for (unsigned int o = 0; o<nb_primitives; ++o) {
        if ((int)*(ptrs++)==-128 && (ptrs+=3)<ptre) {
          const unsigned int w = (unsigned int)*(ptrs-3), h = (unsigned int)*(ptrs-2), s = (unsigned int)*(ptrs-1);
          if (!h && !s) {
            if (w>=o) {
              if (error_message) std::sprintf(error_message,
                                              "CImg3d (%u,%u) refers to invalid shared opacity indice %u for primitive %u",
                                              nb_points,nb_primitives,w,o);
              return false;
            }
          } else ptrs+=w*h*s;
        }
        if (ptrs>ptre) {
          if (error_message) std::sprintf(error_message,
                                          "CImg3d (%u,%u) has incomplete opacity data for primitive %u",
                                          nb_points,nb_primitives,o);
          return false;
        }
      }

      // Check end of data.
      if (ptrs<ptre) {
        if (error_message) std::sprintf(error_message,
                                        "CImg3d (%u,%u) contains %u byte%s more than expected",
                                        nb_points,nb_primitives,(unsigned int)(ptre-ptrs),(ptre-ptrs)>1?"s":"");
        return false;
      }
      return true;
    }

    static bool _is_CImg3d(const T val, const char c) {
      if (val>=(T)c && val<(T)(c+1)) return true;
      return false;
    }

    //@}
    //-------------------------------------
    //
    //! \name Mathematical Functions
    //@{
    //-------------------------------------

    // Define the math formula parser/compiler and evaluator.
    struct _cimg_math_parser {
      CImgList<charT> label;
      CImgList<uintT> code;
      CImg<uintT> level, opcode;
      CImg<doubleT> mem;
      CImg<charT> expr;
      const CImg<T>& reference;
      CImg<Tdouble> reference_stats;
      unsigned int mempos, result;
      const char *const calling_function;
#define _cimg_mp_return(x) { *se = saved_char; return x; }
#define _cimg_mp_opcode0(op) _cimg_mp_return(opcode0(op));
#define _cimg_mp_opcode1(op,i1) _cimg_mp_return(opcode1(op,i1));
#define _cimg_mp_opcode2(op,i1,i2) { const unsigned int _i1 = i1, _i2 = i2; _cimg_mp_return(opcode2(op,_i1,_i2)); }
#define _cimg_mp_opcode3(op,i1,i2,i3) { const unsigned int _i1 = i1, _i2 = i2, _i3 = i3; _cimg_mp_return(opcode3(op,_i1,_i2,_i3)); }
#define _cimg_mp_opcode5(op,i1,i2,i3,i4,i5) { const unsigned int _i1 = i1, _i2 = i2, _i3 = i3, _i4 = i4, _i5 = i5; \
          _cimg_mp_return(opcode5(op,_i1,_i2,_i3,_i4,_i5)); }

      // Constructor - Destructor.
      _cimg_math_parser(const CImg<T>& img, const char *const expression, const char *const funcname=0):
        reference(img),calling_function(funcname?funcname:"cimg_math_parser") {
        unsigned int l = 0;
        if (expression) {
          l = std::strlen(expression);
          expr.assign(expression,l+1);
          if (*expr._data) {
            char *d = expr._data;
            for (const char *s = expr._data; *s || (bool)(*d=0); ++s) if (*s!=' ') *(d++) = *s;
            l = d - expr._data;
          }
        }
        if (!l) throw CImgArgumentException("[_cimg_math_parser] "
                                            "CImg<%s>::%s() : Empty specified expression.",
                                            pixel_type(),calling_function);

        int lv = 0; // Count parenthesis level of expression.
        level.assign(l);
        unsigned int *pd = level._data;
        for (const char *ps = expr._data; *ps && lv>=0; ++ps) *(pd++) = (unsigned int)(*ps=='('?lv++:*ps==')'?--lv:lv);
        if (lv!=0) {
          throw CImgArgumentException("[_cimg_math_parser] "
                                      "CImg<%s>::%s() : Unbalanced parentheses in specified expression '%s'.",
                                      pixel_type(),calling_function,
                                      expr._data);
        }
        // Init constant values.
        mem.assign(512);
        label.assign(512);
        mem[0] = 0;
        mem[1] = 1;
        mem[2] = (double)reference._width;
        mem[3] = (double)reference._height;
        mem[4] = (double)reference._depth;
        mem[5] = (double)reference._spectrum;
        mem[6] = cimg::PI;
        mem[7] = std::exp(1.0); // Then [8] = x, [9] = y, [10] = z, [11] = c
        mempos = 12;
        result = compile(expr._data,expr._data+l); // Compile formula into a serie of opcodes.
      }

      // Insert code instructions.
      unsigned int opcode0(const char op) {
        if (mempos>=mem._width) mem.resize(-200,1,1,1,0);
        const unsigned int pos = mempos++;
        CImg<uintT>::vector(op,pos).move_to(code);
        return pos;
      }

      unsigned int opcode1(const char op, const unsigned int arg1) {
        if (mempos>=mem._width) mem.resize(-200,1,1,1,0);
        const unsigned int pos = mempos++;
        CImg<uintT>::vector(op,pos,arg1).move_to(code);
        return pos;
      }

      unsigned int opcode2(const char op, const unsigned int arg1, const unsigned int arg2) {
        if (mempos>=mem._width) mem.resize(-200,1,1,1,0);
        const unsigned int pos = mempos++;
        CImg<uintT>::vector(op,pos,arg1,arg2).move_to(code);
        return pos;
      }

      unsigned int opcode3(const char op, const unsigned int arg1, const unsigned int arg2, const unsigned int arg3) {
        if (mempos>=mem._width) mem.resize(-200,1,1,1,0);
        const unsigned int pos = mempos++;
        CImg<uintT>::vector(op,pos,arg1,arg2,arg3).move_to(code);
        return pos;
      }

      unsigned int opcode5(const char op, const unsigned int arg1, const unsigned int arg2, const unsigned int arg3,
                           const unsigned int arg4, const unsigned int arg5) {
        if (mempos>=mem._width) mem.resize(-200,1,1,1,0);
        const unsigned int pos = mempos++;
        CImg<uintT>::vector(op,pos,arg1,arg2,arg3,arg4,arg5).move_to(code);
        return pos;
      }

      // Compilation procedure.
      unsigned int compile(char *const ss, char *const se) {
        if (!ss || se<=ss || !*ss) {
          throw CImgArgumentException("[_cimg_math_parser] "
                                      "CImg<%s>::%s() : Missing item in specified expression '%s'.",
                                      pixel_type(),calling_function,
                                      expr._data);
        }
        char
          *const se1 = se-1, *const se2 = se-2, *const se3 = se-3, *const se4 = se-4,
          *const ss1 = ss+1, *const ss2 = ss+2, *const ss3 = ss+3, *const ss4 = ss+4,
          *const ss5 = ss+5, *const ss6 = ss+6, *const ss7 = ss+7;
        const char saved_char = *se; *se = 0;
        const unsigned int clevel = level[ss-expr._data], clevel1 = clevel+1;
        if (*se1==';') return compile(ss,se1);

        // Look for a single value, variable or variable assignment.
        char end = 0, sep = 0; double val = 0;
        const int nb = std::sscanf(ss,"%lf%c%c",&val,&sep,&end);
        if (nb==1) {
          if (val==0) _cimg_mp_return(0);
          if (val==1) _cimg_mp_return(1);
          if (mempos>=mem._width) mem.resize(-200,1,1,1,0);
          const unsigned int pos = mempos++;
          mem[pos] = val;
          _cimg_mp_return(pos);
        }
        if (nb==2 && sep=='%') {
          if (val==0) _cimg_mp_return(0);
          if (val==100) _cimg_mp_return(1);
          if (mempos>=mem._width) mem.resize(-200,1,1,1,0);
          const unsigned int pos = mempos++;
          mem[pos] = val/100;
          _cimg_mp_return(pos);
        }
        if (ss1==se) switch (*ss) {
          case 'w' : _cimg_mp_return(2); case 'h' : _cimg_mp_return(3); case 'd' : _cimg_mp_return(4); case 's' : _cimg_mp_return(5);
          case 'x' : _cimg_mp_return(8); case 'y' : _cimg_mp_return(9); case 'z' : _cimg_mp_return(10); case 'c' : _cimg_mp_return(11);
          case 'e' : _cimg_mp_return(7);
          case 'u' : case '?' : _cimg_mp_opcode2(0,0,1);
          case 'g' : _cimg_mp_opcode0(1);
          case 'i' : _cimg_mp_opcode0(2);
          }
        if (ss1==se1) {
          if (*ss=='p' && *ss1=='i') _cimg_mp_return(6); // pi
          if (*ss=='i') {
            if (*ss1=='m') _cimg_mp_opcode0(57); // im
            if (*ss1=='M') _cimg_mp_opcode0(58); // iM
            if (*ss1=='a') _cimg_mp_opcode0(59); // ia
            if (*ss1=='v') _cimg_mp_opcode0(60); // iv
          }
          if (*ss1=='m') {
            if (*ss=='x') _cimg_mp_opcode0(61); // xm
            if (*ss=='y') _cimg_mp_opcode0(62); // ym
            if (*ss=='z') _cimg_mp_opcode0(63); // zm
            if (*ss=='c') _cimg_mp_opcode0(64); // cm
          }
          if (*ss1=='M') {
            if (*ss=='x') _cimg_mp_opcode0(65); // xM
            if (*ss=='y') _cimg_mp_opcode0(66); // yM
            if (*ss=='z') _cimg_mp_opcode0(67); // zM
            if (*ss=='c') _cimg_mp_opcode0(68); // cM
          }
        }
        if (ss3==se) {
          if (*ss=='x' && *ss1=='/' && *ss2=='w') _cimg_mp_opcode0(3);
          if (*ss=='y' && *ss1=='/' && *ss2=='h') _cimg_mp_opcode0(4);
          if (*ss=='z' && *ss1=='/' && *ss2=='d') _cimg_mp_opcode0(5);
          if (*ss=='c' && *ss1=='/' && *ss2=='s') _cimg_mp_opcode0(6);
        }

        // Look for variable declarations.
        for (char *s = se2; s>ss; --s) if (*s==';' && level[s-expr._data]==clevel) { compile(ss,s); _cimg_mp_return(compile(s+1,se)); }
        for (char *s = ss1, *ps = ss, *ns = ss2; s<se1; ++s, ++ps, ++ns)
          if (*s=='=' && *ns!='=' && *ps!='=' && *ps!='>' && *ps!='<' && *ps!='!' && level[s-expr._data]==clevel) {
             CImg<charT> variable_name(ss,s-ss+1); variable_name.back() = 0;
             bool is_valid_name = true;
             if ((*ss>='0' && *ss<='9') ||
                 (s==ss+1 && (*ss=='x' || *ss=='y' || *ss=='z' || *ss=='c' ||
                              *ss=='w' || *ss=='h' || *ss=='d' || *ss=='s' ||
                              *ss=='e' || *ss=='u' || *ss=='g' || *ss=='i')) ||
                 (s==ss+2 && ((*ss=='p' && *(ss+1)=='i') ||
                              (*ss=='i' && (*(ss+1)=='m' || *(ss+1)=='M' || *(ss+1)=='a' || *(ss+1)=='v'))))) is_valid_name = false;
             for (const char *ns = ss; ns<s; ++ns)
               if ((*ns<'a' || *ns>'z') && (*ns<'A' || *ns>'Z') && (*ns<'0' || *ns>'9') && *ns!='_') {
                 is_valid_name = false; break;
               }
             if (!is_valid_name) {
               *se = saved_char;
               if (!std::strcmp(variable_name,"x") || !std::strcmp(variable_name,"y") || !std::strcmp(variable_name,"z") ||
                   !std::strcmp(variable_name,"c") || !std::strcmp(variable_name,"w") || !std::strcmp(variable_name,"h") ||
                   !std::strcmp(variable_name,"d") || !std::strcmp(variable_name,"s") || !std::strcmp(variable_name,"e") ||
                   !std::strcmp(variable_name,"u") || !std::strcmp(variable_name,"g") || !std::strcmp(variable_name,"i") ||
                   !std::strcmp(variable_name,"pi") || !std::strcmp(variable_name,"im") || !std::strcmp(variable_name,"iM") ||
                   !std::strcmp(variable_name,"ia") || !std::strcmp(variable_name,"iv"))
                  throw CImgArgumentException("[_cimg_math_parser] "
                                             "CImg<%s>::%s() : Invalid assignment of reserved variable name '%s' in specified expression '%s'.",
                                             pixel_type(),calling_function,
                                             variable_name._data,expr._data);
               else
                 throw CImgArgumentException("[_cimg_math_parser] "
                                             "CImg<%s>::%s() : Invalid variable name '%s' in specified expression '%s'.",
                                             pixel_type(),calling_function,
                                             variable_name._data,expr._data);
             }
             for (unsigned int i = 0; i<mempos; ++i) // Check for existing variable with same name.
               if (label[i]._data && !std::strcmp(variable_name,label[i])) {
                 *se = saved_char;
                 throw CImgArgumentException("[_cimg_math_parser] "
                                             "CImg<%s>::%s() : Invalid multiple assignments of variable '%s' in specified expression '%s'.",
                                             pixel_type(),calling_function,
                                             variable_name._data,expr._data);
               }
             const unsigned int src_pos = compile(s+1,se);
             if (mempos>=mem.size()) mem.resize(-200,1,1,1,0);
             const unsigned int dest_pos = mempos++;
             variable_name.move_to(label[dest_pos]);
             CImg<uintT>::vector(7,dest_pos,src_pos).move_to(code);
             _cimg_mp_return(dest_pos);
           }

        // Look for unary/binary operators. The operator precedences is defined as in C++.
        for (char *s = se3, *ns = se2; s>ss; --s, --ns) if (*s=='|' && *ns=='|' && level[s-expr._data]==clevel) _cimg_mp_opcode2(8,compile(ss,s),compile(s+2,se));
        for (char *s = se3, *ns = se2; s>ss; --s, --ns) if (*s=='&' && *ns=='&' && level[s-expr._data]==clevel) _cimg_mp_opcode2(9,compile(ss,s),compile(s+2,se));
        for (char *s = se2; s>ss; --s) if (*s=='|' && level[s-expr._data]==clevel) _cimg_mp_opcode2(10,compile(ss,s),compile(s+1,se));
        for (char *s = se2; s>ss; --s) if (*s=='&' && level[s-expr._data]==clevel) _cimg_mp_opcode2(11,compile(ss,s),compile(s+1,se));
        for (char *s = se3, *ns = se2; s>ss; --s, --ns) if (*s=='!' && *ns=='=' && level[s-expr._data]==clevel) _cimg_mp_opcode2(12,compile(ss,s),compile(s+2,se));
        for (char *s = se3, *ns = se2; s>ss; --s, --ns) if (*s=='=' && *ns=='=' && level[s-expr._data]==clevel) _cimg_mp_opcode2(13,compile(ss,s),compile(s+2,se));
        for (char *s = se3, *ns = se2; s>ss; --s, --ns) if (*s=='<' && *ns=='=' && level[s-expr._data]==clevel) _cimg_mp_opcode2(14,compile(ss,s),compile(s+2,se));
        for (char *s = se3, *ns = se2; s>ss; --s, --ns) if (*s=='>' && *ns=='=' && level[s-expr._data]==clevel) _cimg_mp_opcode2(15,compile(ss,s),compile(s+2,se));
        for (char *s = se2, *ns = se1, *ps = se3; s>ss; --s, --ns, --ps)
          if (*s=='<' && *ns!='<' && *ps!='<' && level[s-expr._data]==clevel) _cimg_mp_opcode2(16,compile(ss,s),compile(s+1,se));
        for (char *s = se2, *ns = se1, *ps = se3; s>ss; --s, --ns, --ps)
          if (*s=='>' && *ns!='>' && *ps!='>' && level[s-expr._data]==clevel) _cimg_mp_opcode2(17,compile(ss,s),compile(s+1,se));
        for (char *s = se3, *ns = se2; s>ss; --s, --ns) if (*s=='<' && *ns=='<' && level[s-expr._data]==clevel) _cimg_mp_opcode2(18,compile(ss,s),compile(s+2,se));
        for (char *s = se3, *ns = se2; s>ss; --s, --ns) if (*s=='>' && *ns=='>' && level[s-expr._data]==clevel) _cimg_mp_opcode2(19,compile(ss,s),compile(s+2,se));
        for (char *s = se2, *ps = se3; s>ss; --s, --ps)
          if (*s=='+' && *ps!='-' && *ps!='+' && *ps!='*' && *ps!='/' && *ps!='%' && *ps!='&' && *ps!='|' && *ps!='^' && *ps!='!' && *ps!='~' &&
              (*ps!='e' || !(ps>ss && (*(ps-1)=='.' || (*(ps-1)>='0' && *(ps-1)<='9')))) && level[s-expr._data]==clevel)
            _cimg_mp_opcode2(21,compile(ss,s),compile(s+1,se));
        for (char *s = se2, *ps = se3; s>ss; --s, --ps)
          if (*s=='-' && *ps!='-' && *ps!='+' && *ps!='*' && *ps!='/' && *ps!='%' && *ps!='&' && *ps!='|' && *ps!='^' && *ps!='!' && *ps!='~' &&
              (*ps!='e' || !(ps>ss && (*(ps-1)=='.' || (*(ps-1)>='0' && *(ps-1)<='9')))) && level[s-expr._data]==clevel)
            _cimg_mp_opcode2(20,compile(ss,s),compile(s+1,se));
        for (char *s = se2; s>ss; --s) if (*s=='*' && level[s-expr._data]==clevel) _cimg_mp_opcode2(22,compile(ss,s),compile(s+1,se));
        for (char *s = se2; s>ss; --s) if (*s=='/' && level[s-expr._data]==clevel) _cimg_mp_opcode2(23,compile(ss,s),compile(s+1,se));
        for (char *s = se2, *ns = se1; s>ss; --s, --ns)
          if (*s=='%' && *ns!='^' && level[s-expr._data]==clevel)
            _cimg_mp_opcode2(24,compile(ss,s),compile(s+1,se));
        if (ss<se1) {
          if (*ss=='+') _cimg_mp_return(compile(ss1,se));
          if (*ss=='-') _cimg_mp_opcode1(26,compile(ss1,se));
          if (*ss=='!') _cimg_mp_opcode1(27,compile(ss1,se));
          if (*ss=='~') _cimg_mp_opcode1(28,compile(ss1,se));
        }
        for (char *s = se2; s>ss; --s) if (*s=='^' && level[s-expr._data]==clevel) _cimg_mp_opcode2(25,compile(ss,s),compile(s+1,se));

        // Look for a function call or a parenthesis.
        if (*se1==')') {
          if (*ss=='(') _cimg_mp_return(compile(ss1,se1));
          if (!std::strncmp(ss,"sin(",4)) _cimg_mp_opcode1(29,compile(ss4,se1));
          if (!std::strncmp(ss,"cos(",4)) _cimg_mp_opcode1(30,compile(ss4,se1));
          if (!std::strncmp(ss,"tan(",4)) _cimg_mp_opcode1(31,compile(ss4,se1));
          if (!std::strncmp(ss,"asin(",5)) _cimg_mp_opcode1(32,compile(ss5,se1));
          if (!std::strncmp(ss,"acos(",5)) _cimg_mp_opcode1(33,compile(ss5,se1));
          if (!std::strncmp(ss,"atan(",5)) _cimg_mp_opcode1(34,compile(ss5,se1));
          if (!std::strncmp(ss,"sinh(",5)) _cimg_mp_opcode1(35,compile(ss5,se1));
          if (!std::strncmp(ss,"cosh(",5)) _cimg_mp_opcode1(36,compile(ss5,se1));
          if (!std::strncmp(ss,"tanh(",5)) _cimg_mp_opcode1(37,compile(ss5,se1));
          if (!std::strncmp(ss,"log10(",6)) _cimg_mp_opcode1(38,compile(ss6,se1));
          if (!std::strncmp(ss,"log(",4)) _cimg_mp_opcode1(39,compile(ss4,se1));
          if (!std::strncmp(ss,"exp(",4)) _cimg_mp_opcode1(40,compile(ss4,se1));
          if (!std::strncmp(ss,"sqrt(",5)) _cimg_mp_opcode1(41,compile(ss5,se1));
          if (!std::strncmp(ss,"sign(",5)) _cimg_mp_opcode1(42,compile(ss5,se1));
          if (!std::strncmp(ss,"abs(",4)) _cimg_mp_opcode1(43,compile(ss4,se1));
          if (!std::strncmp(ss,"atan2(",6)) {
            char *s1 = ss6; while (s1<se2 && (*s1!=',' || level[s1-expr._data]!=clevel1)) ++s1;
            _cimg_mp_opcode2(44,compile(ss6,s1),compile(s1+1,se1));
          }
          if (!std::strncmp(ss,"if(",3)) {
            char *s1 = ss3; while (s1<se4 && (*s1!=',' || level[s1-expr._data]!=clevel1)) ++s1;
            char *s2 = s1+1; while (s2<se2 && (*s2!=',' || level[s2-expr._data]!=clevel1)) ++s2;
            _cimg_mp_opcode3(45,compile(ss3,s1),compile(s1+1,s2),compile(s2+1,se1));
          }
          if (!std::strncmp(ss,"round(",6)) {
            unsigned int value = 0, round = 1, direction = 0;
            char *s1 = ss6; while (s1<se2 && (*s1!=',' || level[s1-expr._data]!=clevel1)) ++s1;
            value = compile(ss6,s1==se2?++s1:s1);
            if (s1<se1) {
              char *s2 = s1+1; while (s2<se2 && (*s2!=',' || level[s2-expr._data]!=clevel1)) ++s2;
              round = compile(s1+1,s2==se2?++s2:s2);
              if (s2<se1) direction = compile(s2+1,se1);
            }
            _cimg_mp_opcode3(46,value,round,direction);
          }
          if (!std::strncmp(ss,"?(",2) || !std::strncmp(ss,"u(",2)) {
            if (*ss2==')') _cimg_mp_opcode2(0,0,1);
            char *s1 = ss2; while (s1<se1 && (*s1!=',' || level[s1-expr._data]!=clevel1)) ++s1;
            if (s1<se1) _cimg_mp_opcode2(0,compile(ss2,s1),compile(s1+1,se1));
            _cimg_mp_opcode2(0,0,compile(ss2,s1));
          }
          if (!std::strncmp(ss,"i(",2)) {
            if (*ss2==')') _cimg_mp_return(0);
            unsigned int indx = 8, indy = 9, indz = 10, indc = 11, borders = 0;
            if (ss2!=se1) {
              char *s1 = ss2; while (s1<se2 && (*s1!=',' || level[s1-expr._data]!=clevel1)) ++s1;
              indx = compile(ss2,s1==se2?++s1:s1);
              if (s1<se1) {
                char *s2 = s1+1; while (s2<se2 && (*s2!=',' || level[s2-expr._data]!=clevel1)) ++s2;
                indy = compile(s1+1,s2==se2?++s2:s2);
                if (s2<se1) {
                  char *s3 = s2+1; while (s3<se2 && (*s3!=',' || level[s3-expr._data]!=clevel1)) ++s3;
                  indz = compile(s2+1,s3==se2?++s3:s3);
                  if (s3<se1) {
                    char *s4 = s3+1; while (s4<se2 && (*s4!=',' || level[s4-expr._data]!=clevel1)) ++s4;
                    indc = compile(s3+1,s4==se2?++s4:s4);
                    if (s4<se1) borders = compile(s4+1,se1);
                  }
                }
              }
            }
            _cimg_mp_opcode5(47,indx,indy,indz,indc,borders);
          }
          if (!std::strncmp(ss,"min(",4) || !std::strncmp(ss,"max(",4)) {
            CImgList<uintT> opcode;
            if (mempos>=mem.size()) mem.resize(-200,1,1,1,0);
            const unsigned int pos = mempos++;
            CImg<uintT>::vector(ss[1]=='i'?48:49,pos).move_to(opcode);
            for (char *s = ss4; s<se; ++s) {
              char *ns = s; while (ns<se && (*ns!=',' || level[ns-expr._data]!=clevel1) && (*ns!=')' || level[ns-expr._data]!=clevel)) ++ns;
              CImg<uintT>::vector(compile(s,ns)).move_to(opcode);
              s = ns;
            }
            (opcode>'y').move_to(code);
            _cimg_mp_return(pos);
          }
          if (!std::strncmp(ss,"arg(",4)) {
            CImgList<uintT> opcode;
            if (mempos>=mem.size()) mem.resize(-200,1,1,1,0);
            const unsigned int pos = mempos++;
            CImg<uintT>::vector(69,pos).move_to(opcode);
            for (char *s = ss4; s<se; ++s) {
              char *ns = s; while (ns<se && (*ns!=',' || level[ns-expr._data]!=clevel1) && (*ns!=')' || level[ns-expr._data]!=clevel)) ++ns;
              CImg<uintT>::vector(compile(s,ns)).move_to(opcode);
              s = ns;
            }
            (opcode>'y').move_to(code);
            _cimg_mp_return(pos);
          }
          if (!std::strncmp(ss,"narg(",5)) {
            if (*ss5==')') _cimg_mp_return(0);
            unsigned int nb_args = 0;
            for (char *s = ss5; s<se; ++s) {
              char *ns = s; while (ns<se && (*ns!=',' || level[ns-expr._data]!=clevel1) && (*ns!=')' || level[ns-expr._data]!=clevel)) ++ns;
              ++nb_args; s = ns;
            }
            if (nb_args==0 || nb_args==1) _cimg_mp_return(nb_args);
            if (mempos>=mem.size()) mem.resize(-200,1,1,1,0);
            const unsigned int pos = mempos++;
            mem[pos] = nb_args;
            _cimg_mp_return(pos);
          }
          if (!std::strncmp(ss,"isval(",6)) {
            char sep = 0, end = 0; double val = 0;
            if (std::sscanf(ss6,"%lf%c%c",&val,&sep,&end)==2 && sep==')') _cimg_mp_return(1);
            _cimg_mp_return(0);
          }
          if (!std::strncmp(ss,"isnan(",6)) _cimg_mp_opcode1(50,compile(ss6,se1));
          if (!std::strncmp(ss,"isinf(",6)) _cimg_mp_opcode1(51,compile(ss6,se1));
          if (!std::strncmp(ss,"isint(",6)) _cimg_mp_opcode1(52,compile(ss6,se1));
          if (!std::strncmp(ss,"isbool(",7)) _cimg_mp_opcode1(53,compile(ss7,se1));
          if (!std::strncmp(ss,"rol(",4) || !std::strncmp(ss,"ror(",4)) {
            unsigned int value = 0, nb = 1;
            char *s1 = ss4; while (s1<se2 && (*s1!=',' || level[s1-expr._data]!=clevel1)) ++s1;
            value = compile(ss4,s1==se2?++s1:s1);
            if (s1<se1) {
              char *s2 = s1+1; while (s2<se2 && (*s2!=',' || level[s2-expr._data]!=clevel1)) ++s2;
              nb = compile(s1+1,se1);
            }
            _cimg_mp_opcode2(*ss2=='l'?54:55,value,nb);
          }

          if (!std::strncmp(ss,"sinc(",5)) _cimg_mp_opcode1(56,compile(ss5,se1));
          if (!std::strncmp(ss,"int(",4)) _cimg_mp_opcode1(70,compile(ss4,se1));
        }

        // No known item found, assuming this is an already initialized variable.
        CImg<charT> variable_name(ss,se-ss+1); variable_name.back() = 0;
        for (unsigned int i = 0; i<mempos; ++i) if (label[i]._data && !std::strcmp(variable_name,label[i])) _cimg_mp_return(i);
        *se = saved_char;
        throw CImgArgumentException("[_cimg_math_parser] "
                                    "CImg<%s>::%s() : Invalid item '%s' in specified expression '%s'.\n",
                                    pixel_type(),calling_function,
                                    variable_name._data,expr._data);
        return 0;
      }

      // Evaluation functions, known by the parser.
      double mp_u() {
        return mem[opcode(2)] + cimg::rand()*(mem[opcode(3)]-mem[opcode(2)]);
      }
      double mp_g() {
        return cimg::grand();
      }
      double mp_i() {
        return (double)reference.atXYZC((int)mem[8],(int)mem[9],(int)mem[10],(int)mem[11],0);
      }
      double mp_xw() {
        return mem[8]/reference.width();
      }
      double mp_yh() {
        return mem[9]/reference.height();
      }
      double mp_zd() {
        return mem[10]/reference.depth();
      }
      double mp_cs() {
        return mem[11]/reference.spectrum();
      }
      double mp_equal() {
        return mem[opcode[2]];
      }
      double mp_logical_and() {
        return (double)((bool)mem[opcode(2)] && (bool)mem[opcode(3)]);
      }
      double mp_logical_or() {
        return (double)((bool)mem[opcode(2)] || (bool)mem[opcode(3)]);
      }
      double mp_infeq() {
        return (double)(mem[opcode(2)]<=mem[opcode(3)]);
      }
      double mp_supeq() {
        return (double)(mem[opcode(2)]>=mem[opcode(3)]);
      }
      double mp_noteq() {
        return (double)(mem[opcode(2)]!=mem[opcode(3)]);
      }
      double mp_eqeq() {
        return (double)(mem[opcode(2)]==mem[opcode(3)]);
      }
      double mp_inf() {
        return (double)(mem[opcode(2)]<mem[opcode(3)]);
      }
      double mp_sup() {
        return (double)(mem[opcode(2)]>mem[opcode(3)]);
      }
      double mp_add() {
        return mem[opcode(2)] + mem[opcode(3)];
      }
      double mp_sub() {
        return mem[opcode(2)] - mem[opcode(3)];
      }
      double mp_mul() {
        return mem[opcode(2)] * mem[opcode(3)];
      }
      double mp_div() {
        return mem[opcode(2)] / mem[opcode(3)];
      }
      double mp_minus() {
        return -mem[opcode(2)];
      }
      double mp_not() {
        return !mem[opcode(2)];
      }
      double mp_logical_not() {
        return !mem[opcode(2)];
      }
      double mp_bitwise_not() {
        return ~(unsigned long)mem[opcode(2)];
      }
      double mp_modulo() {
        return cimg::mod(mem[opcode(2)],mem[opcode(3)]);
      }
      double mp_bitwise_and() {
        return ((unsigned long)mem[opcode(2)] & (unsigned long)mem[opcode(3)]);
      }
      double mp_bitwise_or() {
        return ((unsigned long)mem[opcode(2)] | (unsigned long)mem[opcode(3)]);
      }
      double mp_pow() {
        return std::pow(mem[opcode(2)],mem[opcode(3)]);
      }
      double mp_sin() {
        return std::sin(mem[opcode(2)]);
      }
      double mp_cos() {
        return std::cos(mem[opcode(2)]);
      }
      double mp_tan() {
        return std::tan(mem[opcode(2)]);
      }
      double mp_asin() {
        return std::asin(mem[opcode(2)]);
      }
      double mp_acos() {
        return std::acos(mem[opcode(2)]);
      }
      double mp_atan() {
        return std::atan(mem[opcode(2)]);
      }
      double mp_sinh() {
        return std::sinh(mem[opcode(2)]);
      }
      double mp_cosh() {
        return std::cosh(mem[opcode(2)]);
      }
      double mp_tanh() {
        return std::tanh(mem[opcode(2)]);
      }
      double mp_log10() {
        return std::log10(mem[opcode(2)]);
      }
      double mp_log() {
        return std::log(mem[opcode(2)]);
      }
      double mp_exp() {
        return std::exp(mem[opcode(2)]);
      }
      double mp_sqrt() {
        return std::sqrt(mem[opcode(2)]);
      }
      double mp_sign() {
        return cimg::sign(mem[opcode(2)]);
      }
      double mp_abs() {
        return cimg::abs(mem[opcode(2)]);
      }
      double mp_atan2() {
        return std::atan2(mem[opcode(2)],mem[opcode(3)]);
      }
      double mp_if() {
        return mem[opcode(2)]?mem[opcode(3)]:mem[opcode(4)];
      }
      double mp_round() {
        return cimg::round(mem[opcode(2)],mem[opcode(3)],(int)mem[opcode(4)]);
      }
      double mp_ixyzc() {
        const int c = (int)mem[opcode(5)], b = (int)mem[opcode(6)];
        if (b==0) return (double)reference.linear_atXYZ((float)mem[opcode(2)],
                                                        (float)mem[opcode(3)],
                                                        (float)mem[opcode(4)],
                                                        c<0?0:c>=reference.spectrum()?reference.spectrum()-1:c,0);
        if (b==1) return (double)reference.linear_atXYZ((float)mem[opcode(2)],
                                                        (float)mem[opcode(3)],
                                                        (float)mem[opcode(4)],
                                                        c<0?0:c>=reference.spectrum()?reference.spectrum()-1:c);
        return (double)reference.linear_atXYZ((float)cimg::mod(mem[opcode(2)],(double)reference.width()),
                                              (float)cimg::mod(mem[opcode(3)],(double)reference.height()),
                                              (float)cimg::mod(mem[opcode(4)],(double)reference.depth()),
                                              c<0?0:c>=reference.spectrum()?reference.spectrum()-1:c);
      }
      double mp_min() {
        double val = mem[opcode(2)];
        for (unsigned int i = 3; i<opcode._height; ++i) val = cimg::min(val,mem[opcode(i)]);
        return val;
      }
      double mp_max() {
        double val = mem[opcode(2)];
        for (unsigned int i = 3; i<opcode._height; ++i) val = cimg::max(val,mem[opcode(i)]);
        return val;
      }
      double mp_isnan() {
        const double val = mem[opcode(2)];
        return !(val==val);
      }
      double mp_isinf() {
        const double val = mem[opcode(2)];
        return val==(val+1);
      }
      double mp_isint() {
        const double val = mem[opcode(2)];
        return (double)(int)val==val;
      }
      double mp_isbool() {
        const double val = mem[opcode(2)];
        return (val==0.0 || val==1.0);
      }
      double mp_rol() {
        return cimg::rol(mem[opcode(2)],(unsigned int)mem[opcode(3)]);
      }
      double mp_ror() {
        return cimg::ror(mem[opcode(2)],(unsigned int)mem[opcode(3)]);
      }
      double mp_lsl() {
        return (long)mem[opcode(2)]<<(unsigned int)mem[opcode(3)];
      }
      double mp_lsr() {
        return (long)mem[opcode(2)]>>(unsigned int)mem[opcode(3)];
      }
      double mp_sinc() {
        return cimg::sinc(mem[opcode(2)]);
      }
      double mp_im() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[0]:0;
      }
      double mp_iM() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[1]:0;
      }
      double mp_ia() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[2]:0;
      }
      double mp_iv() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[3]:0;
      }
      double mp_xm() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[4]:0;
      }
      double mp_ym() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[5]:0;
      }
      double mp_zm() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[6]:0;
      }
      double mp_cm() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[7]:0;
      }
      double mp_xM() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[8]:0;
      }
      double mp_yM() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[9]:0;
      }
      double mp_zM() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[10]:0;
      }
      double mp_cM() {
        if (!reference_stats) reference.get_stats().move_to(reference_stats);
        return reference_stats?reference_stats[11]:0;
      }
      double mp_arg() {
        const int _ind = (int)mem[opcode(2)];
        const unsigned int nb_args = opcode._height-2, ind = _ind<0?_ind+nb_args:(unsigned int)_ind;
        if (ind>=nb_args) return 0;
        return mem[opcode(ind+2)];
      }
      double mp_int() {
        return (double)(long)mem[opcode(2)];
      }

      // Evaluation procedure, with image data.
      double eval(const double x, const double y, const double z, const double c) {
        typedef double (_cimg_math_parser::*mp_func)();
        const mp_func mp_funcs[] = {
          &_cimg_math_parser::mp_u,            // 0
          &_cimg_math_parser::mp_g,            // 1
          &_cimg_math_parser::mp_i,            // 2
          &_cimg_math_parser::mp_xw,           // 3
          &_cimg_math_parser::mp_yh,           // 4
          &_cimg_math_parser::mp_zd,           // 5
          &_cimg_math_parser::mp_cs,           // 6
          &_cimg_math_parser::mp_equal,        // 7
          &_cimg_math_parser::mp_logical_or,   // 8
          &_cimg_math_parser::mp_logical_and,  // 9
          &_cimg_math_parser::mp_bitwise_or,   // 10
          &_cimg_math_parser::mp_bitwise_and,  // 11
          &_cimg_math_parser::mp_noteq,        // 12
          &_cimg_math_parser::mp_eqeq,         // 13
          &_cimg_math_parser::mp_infeq,        // 14
          &_cimg_math_parser::mp_supeq,        // 15
          &_cimg_math_parser::mp_inf,          // 16
          &_cimg_math_parser::mp_sup,          // 17
          &_cimg_math_parser::mp_lsl,          // 18
          &_cimg_math_parser::mp_lsr,          // 19
          &_cimg_math_parser::mp_sub,          // 20
          &_cimg_math_parser::mp_add,          // 21
          &_cimg_math_parser::mp_mul,          // 22
          &_cimg_math_parser::mp_div,          // 23
          &_cimg_math_parser::mp_modulo,       // 24
          &_cimg_math_parser::mp_pow,          // 25
          &_cimg_math_parser::mp_minus,        // 26
          &_cimg_math_parser::mp_logical_not,  // 27
          &_cimg_math_parser::mp_bitwise_not,  // 28
          &_cimg_math_parser::mp_sin,          // 29
          &_cimg_math_parser::mp_cos,          // 30
          &_cimg_math_parser::mp_tan,          // 31
          &_cimg_math_parser::mp_asin,         // 32
          &_cimg_math_parser::mp_acos,         // 33
          &_cimg_math_parser::mp_atan,         // 34
          &_cimg_math_parser::mp_sinh,         // 35
          &_cimg_math_parser::mp_cosh,         // 36
          &_cimg_math_parser::mp_tanh,         // 37
          &_cimg_math_parser::mp_log10,        // 38
          &_cimg_math_parser::mp_log,          // 39
          &_cimg_math_parser::mp_exp,          // 40
          &_cimg_math_parser::mp_sqrt,         // 41
          &_cimg_math_parser::mp_sign,         // 42
          &_cimg_math_parser::mp_abs,          // 43
          &_cimg_math_parser::mp_atan2,        // 44
          &_cimg_math_parser::mp_if,           // 45
          &_cimg_math_parser::mp_round,        // 46
          &_cimg_math_parser::mp_ixyzc,        // 47
          &_cimg_math_parser::mp_min,          // 48
          &_cimg_math_parser::mp_max,          // 49
          &_cimg_math_parser::mp_isnan,        // 50
          &_cimg_math_parser::mp_isinf,        // 51
          &_cimg_math_parser::mp_isint,        // 52
          &_cimg_math_parser::mp_isbool,       // 53
          &_cimg_math_parser::mp_rol,          // 54
          &_cimg_math_parser::mp_ror,          // 55
          &_cimg_math_parser::mp_sinc,         // 56
          &_cimg_math_parser::mp_im,           // 57
          &_cimg_math_parser::mp_iM,           // 58
          &_cimg_math_parser::mp_ia,           // 59
          &_cimg_math_parser::mp_iv,           // 60
          &_cimg_math_parser::mp_xm,           // 61
          &_cimg_math_parser::mp_ym,           // 62
          &_cimg_math_parser::mp_zm,           // 63
          &_cimg_math_parser::mp_cm,           // 64
          &_cimg_math_parser::mp_xM,           // 65
          &_cimg_math_parser::mp_yM,           // 66
          &_cimg_math_parser::mp_zM,           // 67
          &_cimg_math_parser::mp_cM,           // 68
          &_cimg_math_parser::mp_arg,          // 69
          &_cimg_math_parser::mp_int           // 70
        };

        if (!mem) return 0;
        mem[8] = x; mem[9] = y; mem[10] = z; mem[11] = c;
        opcode._is_shared = true; opcode._width = opcode._depth = opcode._spectrum = 1;
        cimglist_for(code,l) {
          const CImg<uintT> &op = code[l];
          opcode._data = op._data; opcode._height = op._height;  // Allows to avoid parameter passing to evaluation functions.
          mem[opcode(1)] = (this->*mp_funcs[opcode[0]])();
        }
        return mem[result];
      }
    };

    //! Compute the square value of each pixel.
    CImg<T>& sqr() {
      cimg_for(*this,ptrd,T) { const T val = *ptrd; *ptrd = (T)(val*val); };
      return *this;
    }

    CImg<Tfloat> get_sqr() const {
      return CImg<Tfloat>(*this,false).sqr();
    }

    //! Compute the square root of each pixel value.
    CImg<T>& sqrt() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::sqrt((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_sqrt() const {
      return CImg<Tfloat>(*this,false).sqrt();
    }

    //! Compute the exponential of each pixel value.
    CImg<T>& exp() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::exp((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_exp() const {
      return CImg<Tfloat>(*this,false).exp();
    }

    //! Compute the log of each each pixel value.
    CImg<T>& log() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::log((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_log() const {
      return CImg<Tfloat>(*this,false).log();
    }

    //! Compute the log10 of each each pixel value.
    CImg<T>& log10() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::log10((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_log10() const {
      return CImg<Tfloat>(*this,false).log10();
    }

    //! Compute the absolute value of each pixel value.
    CImg<T>& abs() {
      cimg_for(*this,ptrd,T) *ptrd = cimg::abs(*ptrd);
      return *this;
    }

    CImg<Tfloat> get_abs() const {
      return CImg<Tfloat>(*this,false).abs();
    }

    //! Compute the sign of each pixel value.
    CImg<T>& sign() {
      cimg_for(*this,ptrd,T) *ptrd = cimg::sign(*ptrd);
      return *this;
    }

    CImg<Tfloat> get_sign() const {
      return CImg<Tfloat>(*this,false).sign();
    }

    //! Compute the cosinus of each pixel value.
    CImg<T>& cos() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::cos((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_cos() const {
      return CImg<Tfloat>(*this,false).cos();
    }

    //! Compute the sinus of each pixel value.
    CImg<T>& sin() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::sin((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_sin() const {
      return CImg<Tfloat>(*this,false).sin();
    }

    //! Compute the sinus cardinal of each pixel value.
    CImg<T>& sinc() {
      cimg_for(*this,ptrd,T) *ptrd = (T)cimg::sinc((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_sinc() const {
      return CImg<Tfloat>(*this,false).sinc();
    }

    //! Compute the tangent of each pixel.
    CImg<T>& tan() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::tan((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_tan() const {
      return CImg<Tfloat>(*this,false).tan();
    }

    //! Compute the hyperbolic cosine of each pixel value.
    CImg<T>& cosh() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::cosh((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_cosh() const {
      return CImg<Tfloat>(*this,false).cosh();
    }

    //! Compute the hyperbolic sine of each pixel value.
    CImg<T>& sinh() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::sinh((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_sinh() const {
      return CImg<Tfloat>(*this,false).sinh();
    }

    //! Compute the hyperbolic tangent of each pixel value.
    CImg<T>& tanh() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::tanh((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_tanh() const {
      return CImg<Tfloat>(*this,false).tanh();
    }

    //! Compute the arc-cosine of each pixel value.
    CImg<T>& acos() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::acos((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_acos() const {
      return CImg<Tfloat>(*this,false).acos();
    }

    //! Compute the arc-sinus of each pixel value.
    CImg<T>& asin() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::asin((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_asin() const {
      return CImg<Tfloat>(*this,false).asin();
    }

    //! Compute the arc-tangent of each pixel.
    CImg<T>& atan() {
      cimg_for(*this,ptrd,T) *ptrd = (T)std::atan((double)*ptrd);
      return *this;
    }

    CImg<Tfloat> get_atan() const {
      return CImg<Tfloat>(*this,false).atan();
    }

    //! Compute the arc-tangent of each pixel.
    template<typename t>
    CImg<T>& atan2(const CImg<t>& img) {
      const unsigned int smin = cimg::min(size(),img.size());
      t *ptrs = img._data + smin;
      for (T *ptrd = _data + smin; ptrd>_data; --ptrd, *ptrd = (T)std::atan2((double)*ptrd,(double)*(--ptrs))) {}
      return *this;
    }

    template<typename t>
    CImg<Tfloat> get_atan2(const CImg<t>& img) const {
      return CImg<Tfloat>(*this,false).atan2(img);
    }

    //! Pointwise multiplication between an image and an expression.
    CImg<T>& mul(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"mul");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)(*ptrd * mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        mul(values);
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Pointwise multiplication between two images.
    template<typename t>
    CImg<T>& mul(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return mul(+img);
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = (T)(*ptrd * *(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)(*ptrd * *(ptrs++));
      }
      return *this;
    }

    template<typename t>
    CImg<_cimg_Tt> get_mul(const CImg<t>& img) const {
      return CImg<_cimg_Tt>(*this,false).mul(img);
    }

    //! Pointwise division between an image and an expression.
    CImg<T>& div(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"div");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)(*ptrd / mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        cimg::exception_mode() = omode;
        CImg<T> values(_width,_height,_depth,_spectrum);
        values = expression;
        div(values);
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    //! Pointwise division between two images.
    template<typename t>
    CImg<T>& div(const CImg<t>& img) {
      const unsigned int siz = size(), isiz = img.size();
      if (siz && isiz) {
        if (is_overlapped(img)) return div(+img);
        T *ptrd = _data, *const ptre = _data + siz;
        if (siz>isiz) for (unsigned int n = siz/isiz; n; --n)
          for (const t *ptrs = img._data, *ptrs_end = ptrs + isiz; ptrs<ptrs_end; ++ptrd) *ptrd = (T)(*ptrd / *(ptrs++));
        for (const t *ptrs = img._data; ptrd<ptre; ++ptrd) *ptrd = (T)(*ptrd / *(ptrs++));
      }
      return *this;
    }

    template<typename t>
    CImg<_cimg_Tt> get_div(const CImg<t>& img) const {
      return CImg<_cimg_Tt>(*this,false).div(img);
    }

    //! Compute the power by p of each pixel value.
    CImg<T>& pow(const double p) {
      if (p==0) return fill(1);
      if (p==0.5) { cimg_for(*this,ptrd,T) { const T val = *ptrd; *ptrd = (T)std::sqrt((double)val); } return *this; }
      if (p==1) return *this;
      if (p==2) { cimg_for(*this,ptrd,T) { const T val = *ptrd; *ptrd = val*val; } return *this; }
      if (p==3) { cimg_for(*this,ptrd,T) { const T val = *ptrd; *ptrd = val*val*val; } return *this; }
      if (p==4) { cimg_for(*this,ptrd,T) { const T val = *ptrd; *ptrd = val*val*val*val; } return *this; }
      cimg_for(*this,ptrd,T) *ptrd = (T)std::pow((double)*ptrd,p);
      return *this;
    }

    CImg<Tfloat> get_pow(const double p) const {
      return CImg<Tfloat>(*this,false).pow(p);
    }

    //! Compute the power of each pixel value.
    template<typename t>
    CImg<T>& pow(const CImg<t>& img) {
      if (is_overlapped(img)) return pow(+img);
      t *ptrs = img._data;
      T *ptrf = _data + cimg::min(size(),img.size());
      for (T* ptrd = _data; ptrd<ptrf; ++ptrd) *ptrd = (T)std::pow((double)*ptrd,(double)(*(ptrs++)));
      return *this;
    }

    template<typename t>
    CImg<Tfloat> get_pow(const CImg<t>& img) const {
      return CImg<Tfloat>(*this,false).pow(img);
    }

    //! Compute the power of each pixel value.
    CImg<T>& pow(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"pow");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)std::pow((double)*ptrd,mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        CImg<Tfloat> values(_width,_height,_depth,_spectrum);
        try {
          values.fill(expression,true);
        } catch (CImgException&) {
          cimg::exception_mode() = omode;
          values.load(expression);
        }
        pow(values);
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    CImg<Tfloat> get_pow(const char *const expression) const {
      return CImg<Tfloat>(*this,false).pow(expression);
    }

    //! Compute the bitwise left rotation of each pixel value.
    CImg<T>& rol(const unsigned int n=1) {
      cimg_for(*this,ptrd,T) *ptrd = (T)cimg::rol(*ptrd,n);
      return *this;
    }

    CImg<T> get_rol(const unsigned int n=1) const {
      return (+*this).rol(n);
    }

    template<typename t>
    CImg<T>& rol(const CImg<t>& img) {
      if (is_overlapped(img)) return rol(+img);
      t *ptrs = img._data;
      T *ptrf = _data + cimg::min(size(),img.size());
      for (T* ptrd = _data; ptrd<ptrf; ++ptrd) *ptrd = (T)cimg::rol(*ptrd,(unsigned int)(*(ptrs++)));
      return *this;
    }

    template<typename t>
    CImg<T> get_rol(const CImg<t>& img) const {
      return (+*this).rol(img);
    }

    CImg<T>& rol(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"rol");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)cimg::rol(*ptrd,(unsigned int)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        CImg<Tfloat> values(_width,_height,_depth,_spectrum);
        try {
          values.fill(expression,true);
        } catch (CImgException&) {
          cimg::exception_mode() = omode;
          values.load(expression);
        }
        rol(values);
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    CImg<T> get_rol(const char *const expression) const {
      return (+*this).rol(expression);
    }

    //! Compute the bitwise right rotation of each pixel value.
    CImg<T>& ror(const unsigned int n=1) {
      cimg_for(*this,ptrd,T) *ptrd = (T)cimg::ror(*ptrd,n);
      return *this;
    }

    CImg<T> get_ror(const unsigned int n=1) const {
      return (+*this).ror(n);
    }

    template<typename t>
    CImg<T>& ror(const CImg<t>& img) {
      if (is_overlapped(img)) return ror(+img);
      t *ptrs = img._data;
      T *ptrf = _data + cimg::min(size(),img.size());
      for (T* ptrd = _data; ptrd<ptrf; ++ptrd) *ptrd = (T)cimg::ror(*ptrd,(unsigned int)(*(ptrs++)));
      return *this;
    }

    template<typename t>
    CImg<T> get_ror(const CImg<t>& img) const {
      return (+*this).ror(img);
    }

    CImg<T>& ror(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"ror");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)cimg::ror(*ptrd,(unsigned int)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        CImg<Tfloat> values(_width,_height,_depth,_spectrum);
        try {
          values.fill(expression,true);
        } catch (CImgException&) {
          cimg::exception_mode() = omode;
          values.load(expression);
        }
        ror(values);
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    CImg<T> get_ror(const char *const expression) const {
      return (+*this).ror(expression);
    }

    //! Pointwise min operator between an image and a value.
    CImg<T>& min(const T val) {
      cimg_for(*this,ptrd,T) *ptrd = cimg::min(*ptrd,val);
      return *this;
    }

    CImg<T> get_min(const T val) const {
      return (+*this).min(val);
    }

    //! Pointwise min operator between two images.
    template<typename t>
    CImg<T>& min(const CImg<t>& img) {
      if (is_overlapped(img)) return min(+img);
      t *ptrs = img._data;
      T *ptrf = _data + cimg::min(size(),img.size());
      for (T* ptrd = _data; ptrd<ptrf; ++ptrd) *ptrd = cimg::min((T)*(ptrs++),*ptrd);
      return *this;
    }

    template<typename t>
    CImg<_cimg_Tt> get_min(const CImg<t>& img) const {
      return CImg<_cimg_Tt>(*this,false).min(img);
    }

    //! Pointwise min operator between an image and a string.
    CImg<T>& min(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"min");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)cimg::min(*ptrd,(T)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        CImg<T> values(_width,_height,_depth,_spectrum);
        try {
          values.fill(expression,true);
        } catch (CImgException&) {
          cimg::exception_mode() = omode;
          values.load(expression);
        }
        min(values);
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    CImg<Tfloat> get_min(const char *const expression) const {
      return CImg<Tfloat>(*this,false).min(expression);
    }

    //! Pointwise max operator between an image and a value.
    CImg<T>& max(const T val) {
      cimg_for(*this,ptrd,T) *ptrd = cimg::max(*ptrd,val);
      return *this;
    }

    CImg<T> get_max(const T val) const {
      return (+*this).max(val);
    }

    //! Pointwise max operator between two images.
    template<typename t>
    CImg<T>& max(const CImg<t>& img) {
      if (is_overlapped(img)) return max(+img);
      t *ptrs = img._data;
      T *ptrf = _data + cimg::min(size(),img.size());
      for (T* ptrd = _data; ptrd<ptrf; ++ptrd) *ptrd = cimg::max((T)*(ptrs++),*ptrd);
      return *this;
    }

    template<typename t>
    CImg<_cimg_Tt> get_max(const CImg<t>& img) const {
      return CImg<_cimg_Tt>(*this,false).max(img);
    }

    //! Pointwise max operator between an image and a string.
    CImg<T>& max(const char *const expression) {
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"max");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) { *ptrd = (T)cimg::max(*ptrd,(T)mp.eval(x,y,z,c)); ++ptrd; }
      } catch (CImgException&) {
        CImg<T> values(_width,_height,_depth,_spectrum);
        try {
          values.fill(expression,true);
        } catch (CImgException&) {
          cimg::exception_mode() = omode;
          values.load(expression);
        }
        max(values);
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    CImg<Tfloat> get_max(const char *const expression) const {
      return CImg<Tfloat>(*this,false).max(expression);
    }

    //! Return a reference to the minimum pixel value of the instance image
    T& min() {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "min() : Empty instance.",
                                    cimg_instance);
      T *ptr_min = _data;
      T min_value = *ptr_min;
      cimg_for(*this,ptrs,T) if (*ptrs<min_value) min_value = *(ptr_min=ptrs);
      return *ptr_min;
    }

    const T& min() const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "min() : Empty instance.",
                                    cimg_instance);
      const T *ptr_min = _data;
      T min_value = *ptr_min;
      cimg_for(*this,ptrs,T) if (*ptrs<min_value) min_value = *(ptr_min=ptrs);
      return *ptr_min;
    }

    //! Return a reference to the maximum pixel value of the instance image
    T& max() {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "max() : Empty instance.",
                                    cimg_instance);
      T *ptr_max = _data;
      T max_value = *ptr_max;
      cimg_for(*this,ptrs,T) if (*ptrs>max_value) max_value = *(ptr_max=ptrs);
      return *ptr_max;
    }

    const T& max() const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "max() : Empty instance.",
                                    cimg_instance);
      const T *ptr_max = _data;
      T max_value = *ptr_max;
      cimg_for(*this,ptrs,T) if (*ptrs>max_value) max_value = *(ptr_max=ptrs);
      return *ptr_max;
    }

    //! Return a reference to the minimum pixel value and return also the maximum pixel value.
    template<typename t>
    T& min_max(t& max_val) {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "min_max() : Empty instance.",
                                    cimg_instance);
      T *ptr_min = _data;
      T min_value = *ptr_min, max_value = min_value;
      cimg_for(*this,ptrs,T) {
        const T val = *ptrs;
        if (val<min_value) { min_value = val; ptr_min = ptrs; }
        if (val>max_value) max_value = val;
      }
      max_val = (t)max_value;
      return *ptr_min;
    }

    template<typename t>
    const T& min_max(t& max_val) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "min_max() : Empty instance.",
                                    cimg_instance);
      const T *ptr_min = _data;
      T min_value = *ptr_min, max_value = min_value;
      cimg_for(*this,ptrs,T) {
        const T val = *ptrs;
        if (val<min_value) { min_value = val; ptr_min = ptrs; }
        if (val>max_value) max_value = val;
      }
      max_val = (t)max_value;
      return *ptr_min;
    }

    //! Return a reference to the maximum pixel value and return also the minimum pixel value.
    template<typename t>
    T& max_min(t& min_val) {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "max_min() : Empty instance.",
                                    cimg_instance);
      T *ptr_max = _data;
      T max_value = *ptr_max, min_value = max_value;
      cimg_for(*this,ptrs,T) {
        const T val = *ptrs;
        if (val>max_value) { max_value = val; ptr_max = ptrs; }
        if (val<min_value) min_value = val;
      }
      min_val = (t)min_value;
      return *ptr_max;
    }

    template<typename t>
    const T& max_min(t& min_val) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "max_min() : Empty instance.",
                                    cimg_instance);
      const T *ptr_max = _data;
      T max_value = *ptr_max, min_value = max_value;
      cimg_for(*this,ptrs,T) {
        const T val = *ptrs;
        if (val>max_value) { max_value = val; ptr_max = ptrs; }
        if (val<min_value) min_value = val;
      }
      min_val = (t)min_value;
      return *ptr_max;
    }

    //! Return the kth smallest element of the image.
    T kth_smallest(const unsigned int k) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "kth_smallest() : Empty instance.",
                                    cimg_instance);
      CImg<T> arr(*this);
      unsigned int l = 0, ir = size() - 1;
      for (;;) {
        if (ir<=l+1) {
          if (ir==l+1 && arr[ir]<arr[l]) cimg::swap(arr[l],arr[ir]);
          return arr[k];
        } else {
          const unsigned int mid = (l + ir)>>1;
          cimg::swap(arr[mid],arr[l+1]);
          if (arr[l]>arr[ir]) cimg::swap(arr[l],arr[ir]);
          if (arr[l+1]>arr[ir]) cimg::swap(arr[l+1],arr[ir]);
          if (arr[l]>arr[l+1]) cimg::swap(arr[l],arr[l+1]);
          unsigned int i = l + 1, j = ir;
          const T pivot = arr[l+1];
          for (;;) {
            do ++i; while (arr[i]<pivot);
            do --j; while (arr[j]>pivot);
            if (j<i) break;
            cimg::swap(arr[i],arr[j]);
          }
          arr[l+1] = arr[j];
          arr[j] = pivot;
          if (j>=k) ir = j - 1;
          if (j<=k) l = i;
        }
      }
      return 0;
    }

    //! Return the median value of the image.
    T median() const {
      const unsigned int s = size();
      const T res = kth_smallest(s>>1);
      return (s%2)?res:((res+kth_smallest((s>>1)-1))/2);
    }

    //! Return the sum of all the pixel values in an image.
    Tdouble sum() const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "sum() : Empty instance.",
                                    cimg_instance);
      Tdouble res = 0;
      cimg_for(*this,ptrs,T) res+=(Tdouble)*ptrs;
      return res;
    }

    //! Return the mean pixel value of the instance image.
    Tdouble mean() const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "mean() : Empty instance.",
                                    cimg_instance);
      Tdouble res = 0;
      cimg_for(*this,ptrs,T) res+=(Tdouble)*ptrs;
      return res/size();
    }

    //! Return the variance of the image.
    /**
       @param variance_method Determines how to calculate the variance
       <table border="0">
       <tr><td>0</td>
       <td>Second moment:
       @f$ v = 1/N \sum\limits_{k=1}^{N} (x_k - \bar x)^2
       = 1/N \left( \sum\limits_{k=1}^N x_k^2 - \left( \sum\limits_{k=1}^N x_k \right)^2 / N \right) @f$
       with @f$ \bar x = 1/N \sum\limits_{k=1}^N x_k \f$</td></tr>
       <tr><td>1</td>
       <td>Best unbiased estimator: @f$ v = \frac{1}{N-1} \sum\limits_{k=1}^{N} (x_k - \bar x)^2 @f$</td></tr>
       <tr><td>2</td>
       <td>Least median of squares</td></tr>
       <tr><td>3</td>
       <td>Least trimmed of squares</td></tr>
       </table>
    */
    Tdouble variance(const unsigned int variance_method=1) const {
      Tdouble foo;
      return variance_mean(variance_method,foo);
    }

    //! Return the variance and the mean of the image.
    template<typename t>
    Tdouble variance_mean(const unsigned int variance_method, t& mean) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "variance() : Empty instance.",
                                    cimg_instance);

      Tdouble variance = 0, average = 0;
      const unsigned int siz = size();
      switch (variance_method) {
      case 0 :{ // Least mean square (standard definition)
        Tdouble S = 0, S2 = 0;
        cimg_for(*this,ptrs,T) { const Tdouble val = (Tdouble)*ptrs; S+=val; S2+=val*val; }
        variance = (S2 - S*S/siz)/siz;
        average = S;
      } break;
      case 1 : { // Least mean square (robust definition)
        Tdouble S = 0, S2 = 0;
        cimg_for(*this,ptrs,T) { const Tdouble val = (Tdouble)*ptrs; S+=val; S2+=val*val; }
        variance = siz>1?(S2 - S*S/siz)/(siz - 1):0;
        average = S;
      } break;
      case 2 : { // Least Median of Squares (MAD)
        CImg<Tfloat> buf(*this);
        buf.sort();
        const unsigned int siz2 = siz>>1;
        const Tdouble med_i = (double)buf[siz2];
        cimg_for(buf,ptrs,Tfloat) { const Tdouble val = (Tdouble)*ptrs; *ptrs = (Tfloat)cimg::abs(val - med_i); average+=val; }
        buf.sort();
        const Tdouble sig = (Tdouble)(1.4828*buf[siz2]);
        variance = sig*sig;
      } break;
      default : { // Least trimmed of Squares
        CImg<Tfloat> buf(*this);
        const unsigned int siz2 = siz>>1;
        cimg_for(buf,ptrs,Tfloat) { const Tdouble val = (Tdouble)*ptrs; (*ptrs)=(Tfloat)((*ptrs)*val); average+=val; }
        buf.sort();
        Tdouble a = 0;
        const Tfloat *ptrs = buf._data;
        for (unsigned int j = 0; j<siz2; ++j) a+=(Tdouble)*(ptrs++);
        const Tdouble sig = (Tdouble)(2.6477*std::sqrt(a/siz2));
        variance = sig*sig;
      }
      }
      mean = (t)(average/siz);
      return variance>0?variance:0;
    }

    //! Estimate noise variance of the instance image.
    Tdouble variance_noise(const unsigned int variance_method=1) const {
      const unsigned int siz = size();
      if (!siz || !_data) return 0;
      if (variance_method>1) return get_laplacian().variance(variance_method);
      Tdouble variance = 0, S = 0, S2 = 0;
      if (_depth==1) {
        CImg_3x3(I,T);
        cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,T) {
          const Tdouble val = (Tdouble)Inc + (Tdouble)Ipc + (Tdouble)Icn + (Tdouble)Icp - 4*(Tdouble)Icc;
          S+=val; S2+=val*val;
        }
      } else {
        CImg_3x3x3(I,T);
        cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,T) {
          const Tdouble val =
            (Tdouble)Incc + (Tdouble)Ipcc + (Tdouble)Icnc + (Tdouble)Icpc +
            (Tdouble)Iccn + (Tdouble)Iccp - 6*(Tdouble)Iccc;
          S+=val; S2+=val*val;
        }
      }
      if (variance_method) variance = siz>1?(S2 - S*S/siz)/(siz - 1):0;
      else variance = (S2 - S*S/siz)/siz;
      return variance>0?variance:0;
    }

    //! Compute the MSE (Mean-Squared Error) between two images.
    template<typename t>
    Tdouble MSE(const CImg<t>& img) const {
      if (img.size()!=size())
        throw CImgArgumentException(_cimg_instance
                                    "MSE() : Instance and specified image (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    img._width,img._height,img._depth,img._spectrum,img._data);
      Tdouble vMSE = 0;
      const t* ptr2 = img.end();
      cimg_for(*this,ptr1,T) {
        const Tdouble diff = (Tdouble)*ptr1 - (Tdouble)*(--ptr2);
        vMSE+=diff*diff;
      }
      vMSE/=img.size();
      return vMSE;
    }

    //! Compute the PSNR between two images.
    template<typename t>
    Tdouble PSNR(const CImg<t>& img, const Tdouble valmax=255) const {
      const Tdouble vMSE = (Tdouble)std::sqrt(MSE(img));
      return (vMSE!=0)?(Tdouble)(20*std::log10(valmax/vMSE)):(Tdouble)(cimg::type<Tdouble>::max());
    }

    //! Evaluate math expression.
    /**
       If you make successive evaluations on the same image and with the same expression,
       you can set 'expr' to 0 after the first call, to skip the math parsing step.
    **/
    double eval(const char *const expression, const double x=0, const double y=0, const double z=0, const double c=0) const {
      static _cimg_math_parser *mp = 0;
      if (expression) { delete mp; mp = 0; mp = new _cimg_math_parser(*this,expression,"eval"); }
      if (!mp)
        throw CImgArgumentException(_cimg_instance
                                    "eval() : No expression has been previously specified.",
                                    cimg_instance);
      return mp->eval(x,y,z,c);
    }

    //! Compute a statistics vector (min,max,mean,variance,xmin,ymin,zmin,cmin,xmax,ymax,zmax,cmax).
    CImg<T>& stats(const unsigned int variance_method=1) {
      return get_stats(variance_method).move_to(*this);
    }

    CImg<Tdouble> get_stats(const unsigned int variance_method=1) const {
      if (is_empty()) return CImg<doubleT>();
      const unsigned int siz = size();
      const T *const odata = _data;
      const T *pm = odata, *pM = odata;
      Tdouble S = 0, S2 = 0;
      T m = *pm, M = m;
      cimg_for(*this,ptrs,T) {
        const T val = *ptrs;
        const Tdouble _val = (Tdouble)val;
        if (val<m) { m = val; pm = ptrs; }
        if (val>M) { M = val; pM = ptrs; }
        S+=_val;
        S2+=_val*_val;
      }
      const Tdouble
        mean_value = S/siz,
        _variance_value = variance_method==0?(S2 - S*S/siz)/siz:
        (variance_method==1?(siz>1?(S2 - S*S/siz)/(siz - 1):0):
         variance(variance_method)),
        variance_value = _variance_value>0?_variance_value:0;
      int
        xm = 0, ym = 0, zm = 0, cm = 0,
        xM = 0, yM = 0, zM = 0, cM = 0;
      contains(*pm,xm,ym,zm,cm);
      contains(*pM,xM,yM,zM,cM);
      return CImg<Tdouble>(1,12).fill((Tdouble)m,(Tdouble)M,mean_value,variance_value,
                                      (Tdouble)xm,(Tdouble)ym,(Tdouble)zm,(Tdouble)cm,
                                      (Tdouble)xM,(Tdouble)yM,(Tdouble)zM,(Tdouble)cM);
    }

    //@}
    //-------------------------------------
    //
    //! \name Vector / Matrix Operations
    //@{
    //-------------------------------------

    //! Return the norm of the current vector/matrix. \p ntype = norm type (0=L2, 1=L1, -1=Linf).
    Tdouble magnitude(const int magnitude_type=2) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "magnitude() : Empty instance.",
                                    cimg_instance);
      Tdouble res = 0;
      switch (magnitude_type) {
      case -1 : {
        cimg_for(*this,ptrs,T) { const Tdouble val = (Tdouble)cimg::abs(*ptrs); if (val>res) res = val; }
      } break;
      case 1 : {
        cimg_for(*this,ptrs,T) res+=(Tdouble)cimg::abs(*ptrs);
      } break;
      default : {
        cimg_for(*this,ptrs,T) res+=(Tdouble)cimg::sqr(*ptrs);
        res = (Tdouble)std::sqrt(res);
      }
      }
      return res;
    }

    //! Return the trace of the image, viewed as a matrix.
    Tdouble trace() const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "trace() : Empty instance.",
                                    cimg_instance);
      Tdouble res = 0;
      cimg_forX(*this,k) res+=(Tdouble)(*this)(k,k);
      return res;
    }

    //! Return the determinant of the image, viewed as a matrix.
    Tdouble det() const {
      if (is_empty() || _width!=_height || _depth!=1 || _spectrum!=1)
        throw CImgInstanceException(_cimg_instance
                                    "det() : Instance is empty or not a square matrix.",
                                    cimg_instance);

      switch (_width) {
      case 1 : return (Tdouble)((*this)(0,0));
      case 2 : return (Tdouble)((*this)(0,0))*(Tdouble)((*this)(1,1)) - (Tdouble)((*this)(0,1))*(Tdouble)((*this)(1,0));
      case 3 : {
        const Tdouble
          a = (Tdouble)_data[0], d = (Tdouble)_data[1], g = (Tdouble)_data[2],
          b = (Tdouble)_data[3], e = (Tdouble)_data[4], h = (Tdouble)_data[5],
          c = (Tdouble)_data[6], f = (Tdouble)_data[7], i = (Tdouble)_data[8];
        return i*a*e - a*h*f - i*b*d + b*g*f + c*d*h - c*g*e;
      }
      default : {
        CImg<Tfloat> lu(*this);
        CImg<uintT> indx;
        bool d;
        lu._LU(indx,d);
        Tdouble res = d?(Tdouble)1:(Tdouble)-1;
        cimg_forX(lu,i) res*=lu(i,i);
        return res;
      }
      }
      return 0;
    }

    //! Return the dot product of the current vector/matrix with the vector/matrix \p img.
    template<typename t>
    Tdouble dot(const CImg<t>& img) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "dot() : Empty instance.",
                                    cimg_instance);
      if (!img)
        throw CImgArgumentException(_cimg_instance
                                    "dot() : Empty specified image.",
                                    cimg_instance);

      const unsigned int nb = cimg::min(size(),img.size());
      Tdouble res = 0;
      for (unsigned int off = 0; off<nb; ++off) res+=(Tdouble)_data[off]*(Tdouble)img[off];
      return res;
    }

    //! Return a new image corresponding to the vector located at (\p x,\p y,\p z) of the current vector-valued image.
    CImg<T> get_vector_at(const unsigned int x, const unsigned int y=0, const unsigned int z=0) const {
      _cimg_static CImg<T> res;
      if (res._height!=_spectrum) res.assign(1,_spectrum);
      const unsigned int whd = _width*_height*_depth;
      const T *ptrs = data(x,y,z);
      T *ptrd = res._data;
      cimg_forC(*this,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
      return res;
    }

    //! Return a new image corresponding to the \a square \a matrix located at (\p x,\p y,\p z) of the current vector-valued image.
    CImg<T> get_matrix_at(const unsigned int x=0, const unsigned int y=0, const unsigned int z=0) const {
      const int n = (int)std::sqrt((double)_spectrum);
      const T *ptrs = data(x,y,z,0);
      const unsigned int whd = _width*_height*_depth;
      CImg<T> res(n,n);
      T *ptrd = res._data;
      cimg_forC(*this,c) { *(ptrd++) = *ptrs; ptrs+=whd; }
      return res;
    }

    //! Return a new image corresponding to the \a diffusion \a tensor located at (\p x,\p y,\p z) of the current vector-valued image.
    CImg<T> get_tensor_at(const unsigned int x, const unsigned int y=0, const unsigned int z=0) const {
      const T *ptrs = data(x,y,z,0);
      const unsigned int whd = _width*_height*_depth;
      if (_spectrum==6) return tensor(*ptrs,*(ptrs+whd),*(ptrs+2*whd),*(ptrs+3*whd),*(ptrs+4*whd),*(ptrs+5*whd));
      if (_spectrum==3) return tensor(*ptrs,*(ptrs+whd),*(ptrs+2*whd));
      return tensor(*ptrs);
    }

    //! Set the image \p vec as the \a vector \a valued pixel located at (\p x,\p y,\p z) of the current vector-valued image.
    template<typename t>
    CImg<T>& set_vector_at(const CImg<t>& vec, const unsigned int x, const unsigned int y=0, const unsigned int z=0) {
      if (x<_width && y<_height && z<_depth) {
        const t *ptrs = vec._data;
        const unsigned int whd = _width*_height*_depth;
        T *ptrd = data(x,y,z);
        for (unsigned int k = cimg::min((unsigned int)vec.size(),_spectrum); k; --k) { *ptrd = (T)*(ptrs++); ptrd+=whd; }
      }
      return *this;
    }

    //! Set the image \p vec as the \a square \a matrix-valued pixel located at (\p x,\p y,\p z) of the current vector-valued image.
    template<typename t>
    CImg<T>& set_matrix_at(const CImg<t>& mat, const unsigned int x=0, const unsigned int y=0, const unsigned int z=0) {
      return set_vector_at(mat,x,y,z);
    }

    //! Set the image \p vec as the \a tensor \a valued pixel located at (\p x,\p y,\p z) of the current vector-valued image.
    template<typename t>
    CImg<T>& set_tensor_at(const CImg<t>& ten, const unsigned int x=0, const unsigned int y=0, const unsigned int z=0) {
      T *ptrd = data(x,y,z,0);
      const unsigned int siz = _width*_height*_depth;
      if (ten._height==2) {
        *ptrd = (T)ten[0]; ptrd+=siz;
        *ptrd = (T)ten[1]; ptrd+=siz;
        *ptrd = (T)ten[3];
      }
      else {
        *ptrd = (T)ten[0]; ptrd+=siz;
        *ptrd = (T)ten[1]; ptrd+=siz;
        *ptrd = (T)ten[2]; ptrd+=siz;
        *ptrd = (T)ten[4]; ptrd+=siz;
        *ptrd = (T)ten[5]; ptrd+=siz;
        *ptrd = (T)ten[8];
      }
      return *this;
    }

    //! Unroll all images values into a one-column vector.
    CImg<T>& vector() {
      return unroll('y');
    }

    CImg<T> get_vector() const {
      return get_unroll('y');
    }

    //! Realign pixel values of the instance image as a square matrix
    CImg<T>& matrix() {
      const unsigned int siz = size();
      switch (siz) {
      case 1 : break;
      case 4 : _width = _height = 2; break;
      case 9 : _width = _height = 3; break;
      case 16 : _width = _height = 4; break;
      case 25 : _width = _height = 5; break;
      case 36 : _width = _height = 6; break;
      case 49 : _width = _height = 7; break;
      case 64 : _width = _height = 8; break;
      case 81 : _width = _height = 9; break;
      case 100 : _width = _height = 10; break;
      default : {
        unsigned int i = 11, i2 = i*i;
        while (i2<siz) { i2+=2*i + 1; ++i; }
        if (i2==siz) _width = _height = i;
        else throw CImgInstanceException(_cimg_instance
                                         "matrix() : Invalid instance size %u (should be a square integer).",
                                         cimg_instance,
                                         siz);
      }
      }
      return *this;
    }

    CImg<T> get_matrix() const {
      return (+*this).matrix();
    }

    //! Realign pixel values of the instance image as a symmetric tensor.
    CImg<T>& tensor() {
      return get_tensor().move_to(*this);
    }

    CImg<T> get_tensor() const {
      CImg<T> res;
      const unsigned int siz = size();
      switch (siz) {
      case 1 : break;
      case 3 :
        res.assign(2,2);
        res(0,0) = (*this)(0);
        res(1,0) = res(0,1) = (*this)(1);
        res(1,1) = (*this)(2);
        break;
      case 6 :
        res.assign(3,3);
        res(0,0) = (*this)(0);
        res(1,0) = res(0,1) = (*this)(1);
        res(2,0) = res(0,2) = (*this)(2);
        res(1,1) = (*this)(3);
        res(2,1) = res(1,2) = (*this)(4);
        res(2,2) = (*this)(5);
        break;
      default :
        throw CImgInstanceException(_cimg_instance
                                    "tensor() : Invalid instance size (does not define a 1x1, 2x2 or 3x3 tensor).",
                                    cimg_instance);
      }
      return res;
    }

    //! Get a diagonal matrix, whose diagonal coefficients are the coefficients of the input image.
    CImg<T>& diagonal() {
      return get_diagonal().move_to(*this);
    }

    CImg<T> get_diagonal() const {
      if (is_empty()) return *this;
      CImg<T> res(size(),size(),1,1,0);
      cimg_foroff(*this,off) res(off,off) = (*this)(off);
      return res;
    }

    //! Get an identity matrix having same dimension than instance image.
    CImg<T>& identity_matrix() {
      return identity_matrix(cimg::max(_width,_height)).move_to(*this);
    }

    CImg<T> get_identity_matrix() const {
      return identity_matrix(cimg::max(_width,_height));
    }

    //! Return a N-numbered sequence vector from \p a0 to \p a1.
    CImg<T>& sequence(const T a0, const T a1) {
      if (is_empty()) return *this;
      const unsigned int siz = size() - 1;
      T* ptr = _data;
      if (siz) {
        const Tdouble delta = (Tdouble)a1 - (Tdouble)a0;
        cimg_foroff(*this,l) *(ptr++) = (T)(a0 + delta*l/siz);
      } else *ptr = a0;
      return *this;
    }

    CImg<T> get_sequence(const T a0, const T a1) const {
      return (+*this).sequence(a0,a1);
    }

    //! Transpose the current matrix.
    CImg<T>& transpose() {
      if (_width==1) { _width = _height; _height = 1; return *this; }
      if (_height==1) { _height = _width; _width = 1; return *this; }
      if (_width==_height) {
        cimg_forYZC(*this,y,z,c) for (int x = y; x<width(); ++x) cimg::swap((*this)(x,y,z,c),(*this)(y,x,z,c));
        return *this;
      }
      return get_transpose().move_to(*this);
    }

    CImg<T> get_transpose() const {
      return get_permute_axes("yxzc");
    }

    //! Compute the cross product between two 3d vectors.
    template<typename t>
    CImg<T>& cross(const CImg<t>& img) {
      if (_width!=1 || _height<3 || img._width!=1 || img._height<3)
        throw CImgInstanceException(_cimg_instance
                                    "cross() : Instance and/or specified image (%u,%u,%u,%u,%p) are not 3d vectors.",
                                    cimg_instance,
                                    img._width,img._height,img._depth,img._spectrum,img._data);

      const T x = (*this)[0], y = (*this)[1], z = (*this)[2];
      (*this)[0] = (T)(y*img[2] - z*img[1]);
      (*this)[1] = (T)(z*img[0] - x*img[2]);
      (*this)[2] = (T)(x*img[1] - y*img[0]);
      return *this;
    }

    template<typename t>
    CImg<_cimg_Tt> get_cross(const CImg<t>& img) const {
      return CImg<_cimg_Tt>(*this).cross(img);
    }

    //! Invert the current matrix.
    CImg<T>& invert(const bool use_LU=true) {
      if (_width!=_height || _depth!=1 || _spectrum!=1)
        throw CImgInstanceException(_cimg_instance
                                    "invert() : Instance is not a square matrix.",
                                    cimg_instance);
#ifdef cimg_use_lapack
      int INFO = (int)use_LU, N = _width, LWORK = 4*N, *const IPIV = new int[N];
      Tfloat
        *const lapA = new Tfloat[N*N],
        *const WORK = new Tfloat[LWORK];
      cimg_forXY(*this,k,l) lapA[k*N+l] = (Tfloat)((*this)(k,l));
      cimg::getrf(N,lapA,IPIV,INFO);
      if (INFO)
        cimg::warn(_cimg_instance
                   "invert() : LAPACK function dgetrf_() returned error code %d.",
                   cimg_instance,
                   INFO);
      else {
        cimg::getri(N,lapA,IPIV,WORK,LWORK,INFO);
        if (INFO)
          cimg::warn(_cimg_instance
                     "invert() : LAPACK function dgetri_() returned error code %d.",
                     cimg_instance,
                     INFO);
      }
      if (!INFO) cimg_forXY(*this,k,l) (*this)(k,l) = (T)(lapA[k*N+l]); else fill(0);
      delete[] IPIV; delete[] lapA; delete[] WORK;
#else
      const double dete = _width>3?-1.0:det();
      if (dete!=0.0 && _width==2) {
        const double
          a = _data[0], c = _data[1],
          b = _data[2], d = _data[3];
        _data[0] = (T)(d/dete); _data[1] = (T)(-c/dete);
        _data[2] = (T)(-b/dete); _data[3] = (T)(a/dete);
      } else if (dete!=0.0 && _width==3) {
        const double
          a = _data[0], d = _data[1], g = _data[2],
          b = _data[3], e = _data[4], h = _data[5],
          c = _data[6], f = _data[7], i = _data[8];
        _data[0] = (T)((i*e-f*h)/dete), _data[1] = (T)((g*f-i*d)/dete), _data[2] = (T)((d*h-g*e)/dete);
        _data[3] = (T)((h*c-i*b)/dete), _data[4] = (T)((i*a-c*g)/dete), _data[5] = (T)((g*b-a*h)/dete);
        _data[6] = (T)((b*f-e*c)/dete), _data[7] = (T)((d*c-a*f)/dete), _data[8] = (T)((a*e-d*b)/dete);
      } else {
        if (use_LU) { // LU-based inverse computation
          CImg<Tfloat> A(*this), indx, col(1,_width);
          bool d;
          A._LU(indx,d);
          cimg_forX(*this,j) {
            col.fill(0);
            col(j) = 1;
            col._solve(A,indx);
            cimg_forX(*this,i) (*this)(j,i) = (T)col(i);
          }
        } else { // SVD-based inverse computation
          CImg<Tfloat> U(_width,_width), S(1,_width), V(_width,_width);
          SVD(U,S,V,false);
          U.transpose();
          cimg_forY(S,k) if (S[k]!=0) S[k]=1/S[k];
          S.diagonal();
          *this = V*S*U;
        }
      }
#endif
      return *this;
    }

    CImg<Tfloat> get_invert(const bool use_LU=true) const {
      return CImg<Tfloat>(*this,false).invert(use_LU);
    }

    //! Compute the pseudo-inverse (Moore-Penrose) of the matrix.
    CImg<T>& pseudoinvert() {
      return get_pseudoinvert().move_to(*this);
    }

    CImg<Tfloat> get_pseudoinvert() const {
      CImg<Tfloat> U, S, V;
      SVD(U,S,V);
      cimg_forX(V,x) {
        const Tfloat s = S(x), invs = s!=0?1/s:(Tfloat)0;
        cimg_forY(V,y) V(x,y)*=invs;
      }
      return V*U.transpose();
    }

    //! Solve a linear system AX=B where B=*this.
    template<typename t>
    CImg<T>& solve(const CImg<t>& A) {
      if (_width!=1 || _depth!=1 || _spectrum!=1 || _height!=A._height || A._depth!=1 || A._spectrum!=1)
        throw CImgArgumentException(_cimg_instance
                                    "solve() : Instance and specified matrix (%u,%u,%u,%u,%p) have incompatible dimensions.",
                                    cimg_instance,
                                    A._width,A._height,A._depth,A._spectrum,A._data);
      typedef _cimg_Ttfloat Ttfloat;
      if (A._width==A._height) {
#ifdef cimg_use_lapack
        char TRANS = 'N';
        int INFO, N = _height, LWORK = 4*N, one = 1, *const IPIV = new int[N];
        Ttfloat
          *const lapA = new Ttfloat[N*N],
          *const lapB = new Ttfloat[N],
          *const WORK = new Ttfloat[LWORK];
        cimg_forXY(A,k,l) lapA[k*N+l] = (Ttfloat)(A(k,l));
        cimg_forY(*this,i) lapB[i] = (Ttfloat)((*this)(i));
        cimg::getrf(N,lapA,IPIV,INFO);
        if (INFO)
          cimg::warn(_cimg_instance
                     "solve() : LAPACK library function dgetrf_() returned error code %d.",
                     cimg_instance,
                     INFO);

        if (!INFO) {
          cimg::getrs(TRANS,N,lapA,IPIV,lapB,INFO);
          if (INFO)
            cimg::warn(_cimg_instance
                       "solve() : LAPACK library function dgetrs_() returned error code %d.",
                       cimg_instance,
                       INFO);
        }
        if (!INFO) cimg_forY(*this,i) (*this)(i) = (T)(lapB[i]); else fill(0);
        delete[] IPIV; delete[] lapA; delete[] lapB; delete[] WORK;
#else
        CImg<Ttfloat> lu(A);
        CImg<Ttfloat> indx;
        bool d;
        lu._LU(indx,d);
        _solve(lu,indx);
#endif
      } else assign(A.get_pseudoinvert()*(*this));
      return *this;
    }

    template<typename t>
    CImg<_cimg_Ttfloat> get_solve(const CImg<t>& A) const {
      return CImg<_cimg_Ttfloat>(*this,false).solve(A);
    }

    template<typename t, typename ti>
    CImg<T>& _solve(const CImg<t>& A, const CImg<ti>& indx) {
      typedef _cimg_Ttfloat Ttfloat;
      const int N = size();
      int ii = -1;
      Ttfloat sum;
      for (int i = 0; i<N; ++i) {
        const int ip = (int)indx[i];
        Ttfloat sum = (*this)(ip);
        (*this)(ip) = (*this)(i);
        if (ii>=0) for (int j = ii; j<=i-1; ++j) sum-=A(j,i)*(*this)(j);
        else if (sum!=0) ii = i;
        (*this)(i) = (T)sum;
      }
      for (int i = N - 1; i>=0; --i) {
        sum = (*this)(i);
        for (int j = i + 1; j<N; ++j) sum-=A(j,i)*(*this)(j);
        (*this)(i) = (T)(sum/A(i,i));
      }
      return *this;
    }

    //! Solve a linear system AX=B where B=*this and A is a tridiagonal matrix A = [ b0,c0,0,...; a1,b1,c1,0,... ; ... ; ...,0,aN,bN ].
    // (Use the Thomas Algorithm).
    template<typename t>
    CImg<T>& solve_tridiagonal(const CImg<t>& a, const CImg<t>& b, const CImg<t>& c) {
      const int siz = (int)size();
      if ((int)a.size()!=siz || (int)b.size()!=siz || (int)c.size()!=siz)
        throw CImgArgumentException(_cimg_instance
                                    "solve_tridiagonal() : Instance and tridiagonal coefficients "
                                    "(%u,%u,%u,%u,%p), (%u,%u,%u,%u,%p) and (%u,%u,%u,%u,%p) have incompatible dimensions.",
                                    cimg_instance,
                                    a._width,a._height,a._depth,a._spectrum,a._data,
                                    b._width,b._height,b._depth,b._spectrum,b._data,
                                    c._width,c._height,c._depth,c._spectrum,c._data);

      typedef _cimg_Ttfloat Ttfloat;
      CImg<Ttfloat> nc(siz);
      const T *ptra = a._data, *ptrb = b._data, *ptrc = c._data;
      T *ptrnc = nc._data, *ptrd = _data;
      const Ttfloat valb0 = (Ttfloat)*(ptrb++);
      *ptrnc = *(ptrc++)/valb0;
      Ttfloat vald = (Ttfloat)(*(ptrd++)/=valb0);
      for (int i = 1; i<siz; ++i) {
        const Ttfloat
          vala = (Tfloat)*(ptra++),
          id = 1/(*(ptrb++) - *(ptrnc++)*vala);
        *ptrnc = *(ptrc++)*id;
        vald = ((*ptrd-=vala*vald)*=id);
        ++ptrd;
      }
      vald = *(--ptrd);
      for (int i = siz-2; i>=0; --i) vald = (*(--ptrd)-=*(--ptrnc)*vald);
      return *this;
    }

    template<typename t>
    CImg<_cimg_Ttfloat> get_solve_tridiagonal(const CImg<t>& a, const CImg<t>& b, const CImg<t>& c) const {
      return CImg<_cimg_Ttfloat>(*this,false).solve_tridiagonal(a,b,c);
    }

    //! Compute the eigenvalues and eigenvectors of a matrix.
    template<typename t>
    const CImg<T>& eigen(CImg<t>& val, CImg<t> &vec) const {
      if (is_empty()) { val.assign(); vec.assign(); }
      else {
        if (_width!=_height || _depth>1 || _spectrum>1)
          throw CImgInstanceException(_cimg_instance
                                      "eigen() : Instance is not a square matrix.",
                                      cimg_instance);

        if (val.size()<_width) val.assign(1,_width);
        if (vec.size()<_width*_width) vec.assign(_width,_width);
        switch (_width) {
        case 1 : { val[0] = (t)(*this)[0]; vec[0] = (t)1; } break;
        case 2 : {
          const double a = (*this)[0], b = (*this)[1], c = (*this)[2], d = (*this)[3], e = a + d;
          double f = e*e - 4*(a*d - b*c);
          if (f<0)
            cimg::warn(_cimg_instance
                       "CImg<%s>::eigen() : Complex eigenvalues found.",
                       cimg_instance);

          f = std::sqrt(f);
          const double l1 = 0.5*(e-f), l2 = 0.5*(e+f);
          const double theta1 = std::atan2(l2-a,b), theta2 = std::atan2(l1-a,b);
          val[0] = (t)l2;
          val[1] = (t)l1;
          vec(0,0) = (t)std::cos(theta1);
          vec(0,1) = (t)std::sin(theta1);
          vec(1,0) = (t)std::cos(theta2);
          vec(1,1) = (t)std::sin(theta2);
        } break;
        default :
          throw CImgInstanceException(_cimg_instance
                                      "eigen() : Eigenvalues computation of general matrices is limited to 2x2 matrices.",
                                      cimg_instance);
        }
      }
      return *this;
    }

    CImgList<Tfloat> get_eigen() const {
      CImgList<Tfloat> res(2);
      eigen(res[0],res[1]);
      return res;
    }

    //! Compute the eigenvalues and eigenvectors of a symmetric matrix.
    template<typename t>
    const CImg<T>& symmetric_eigen(CImg<t>& val, CImg<t>& vec) const {
      if (is_empty()) { val.assign(); vec.assign(); }
      else {
#ifdef cimg_use_lapack
        char JOB = 'V', UPLO = 'U';
        int N = _width, LWORK = 4*N, INFO;
        Tfloat
          *const lapA = new Tfloat[N*N],
          *const lapW = new Tfloat[N],
          *const WORK = new Tfloat[LWORK];
        cimg_forXY(*this,k,l) lapA[k*N+l] = (Tfloat)((*this)(k,l));
        cimg::syev(JOB,UPLO,N,lapA,lapW,WORK,LWORK,INFO);
        if (INFO)
          cimg::warn(_cimg_instance
                     "symmetric_eigen() : LAPACK library function dsyev_() returned error code %d.",
                     cimg_instance,
                     INFO);

        val.assign(1,N);
        vec.assign(N,N);
        if (!INFO) {
          cimg_forY(val,i) val(i) = (T)lapW[N-1-i];
          cimg_forXY(vec,k,l) vec(k,l) = (T)(lapA[(N-1-k)*N+l]);
        } else { val.fill(0); vec.fill(0); }
        delete[] lapA; delete[] lapW; delete[] WORK;
#else
        if (_width!=_height || _depth>1 || _spectrum>1)
          throw CImgInstanceException(_cimg_instance
                                      "eigen() : Instance is not a square matrix.",
                                      cimg_instance);

        val.assign(1,_width);
        if (vec._data) vec.assign(_width,_width);
        if (_width<3) {
          eigen(val,vec);
          if (_width==2) { vec[1] = -vec[2]; vec[3] = vec[0]; } // Force orthogonality for 2x2 matrices.
          return *this;
        }
        CImg<t> V(_width,_width);
        SVD(vec,val,V,false);
        bool is_ambiguous = false;
        float eig = 0;
        cimg_forY(val,p) {       // check for ambiguous cases.
          if (val[p]>eig) eig = (float)val[p];
          t scal = 0;
          cimg_forY(vec,y) scal+=vec(p,y)*V(p,y);
          if (cimg::abs(scal)<0.9f) is_ambiguous = true;
          if (scal<0) val[p] = -val[p];
        }
        if (is_ambiguous) {
          ++(eig*=2);
          SVD(vec,val,V,false,40,eig);
          val-=eig;
        }
        CImg<intT> permutations;  // sort eigenvalues in decreasing order
        CImg<t> tmp(_width);
        val.sort(permutations,false);
        cimg_forY(vec,k) {
          cimg_forY(permutations,y) tmp(y) = vec(permutations(y),k);
          std::memcpy(vec.data(0,k),tmp._data,sizeof(t)*_width);
        }
#endif
      }
      return *this;
    }

    CImgList<Tfloat> get_symmetric_eigen() const {
      CImgList<Tfloat> res(2);
      symmetric_eigen(res[0],res[1]);
      return res;
    }

    //! Sort values of a vector and get corresponding permutations.
    template<typename t>
    CImg<T>& sort(CImg<t>& permutations, const bool increasing=true) {
      permutations.assign(_width,_height,_depth,_spectrum);
      if (is_empty()) return *this;
      cimg_foroff(permutations,off) permutations[off] = (t)off;
      return _quicksort(0,size()-1,permutations,increasing,true);
    }

    template<typename t>
    CImg<T> get_sort(CImg<t>& permutations, const bool increasing=true) const {
      return (+*this).sort(permutations,increasing);
    }

    //! Sort image values.
    CImg<T>& sort(const bool increasing=true, const char axis=0) {
      if (is_empty()) return *this;
      CImg<uintT> perm;
      switch (axis) {
      case 0 :
        _quicksort(0,size()-1,perm,increasing,false);
        break;
      case 'x' : {
        perm.assign(_width);
        get_crop(0,0,0,0,_width-1,0,0,0).sort(perm,increasing);
        CImg<T> img(*this,false);
        cimg_forXYZC(*this,x,y,z,c) (*this)(x,y,z,c) = img(perm[x],y,z,c);
      } break;
      case 'y' : {
        perm.assign(_height);
        get_crop(0,0,0,0,0,_height-1,0,0).sort(perm,increasing);
        CImg<T> img(*this,false);
        cimg_forXYZC(*this,x,y,z,c) (*this)(x,y,z,c) = img(x,perm[y],z,c);
      } break;
      case 'z' : {
        perm.assign(_depth);
        get_crop(0,0,0,0,0,0,_depth-1,0).sort(perm,increasing);
        CImg<T> img(*this,false);
        cimg_forXYZC(*this,x,y,z,c) (*this)(x,y,z,c) = img(x,y,perm[z],c);
      } break;
      case 'c' : {
        perm.assign(_spectrum);
        get_crop(0,0,0,0,0,0,0,_spectrum-1).sort(perm,increasing);
        CImg<T> img(*this,false);
        cimg_forXYZC(*this,x,y,z,c) (*this)(x,y,z,c) = img(x,y,z,perm[c]);
      } break;
      default :
        throw CImgArgumentException(_cimg_instance
                                    "sort() : Invalid specified axis '%c' "
                                    "(should be { x | y | z | c }).",
                                    cimg_instance,axis);
      }
      return *this;
    }

    CImg<T> get_sort(const bool increasing=true, const char axis=0) const {
      return (+*this).sort(increasing,axis);
    }

    template<typename t>
    CImg<T>& _quicksort(const int indm, const int indM, CImg<t>& permutations, const bool increasing, const bool is_permutations) {
      if (indm<indM) {
        const int mid = (indm + indM)/2;
        if (increasing) {
          if ((*this)[indm]>(*this)[mid]) {
            cimg::swap((*this)[indm],(*this)[mid]); if (is_permutations) cimg::swap(permutations[indm],permutations[mid]);
          }
          if ((*this)[mid]>(*this)[indM]) {
            cimg::swap((*this)[indM],(*this)[mid]); if (is_permutations) cimg::swap(permutations[indM],permutations[mid]);
          }
          if ((*this)[indm]>(*this)[mid]) {
            cimg::swap((*this)[indm],(*this)[mid]); if (is_permutations) cimg::swap(permutations[indm],permutations[mid]);
          }
        } else {
          if ((*this)[indm]<(*this)[mid]) {
            cimg::swap((*this)[indm],(*this)[mid]); if (is_permutations) cimg::swap(permutations[indm],permutations[mid]);
          }
          if ((*this)[mid]<(*this)[indM]) {
            cimg::swap((*this)[indM],(*this)[mid]); if (is_permutations) cimg::swap(permutations[indM],permutations[mid]);
          }
          if ((*this)[indm]<(*this)[mid]) {
            cimg::swap((*this)[indm],(*this)[mid]); if (is_permutations) cimg::swap(permutations[indm],permutations[mid]);
          }
        }
        if (indM - indm>=3) {
          const T pivot = (*this)[mid];
          int i = indm, j = indM;
          if (increasing) {
            do {
              while ((*this)[i]<pivot) ++i;
              while ((*this)[j]>pivot) --j;
              if (i<=j) {
                if (is_permutations) cimg::swap(permutations[i],permutations[j]);
                cimg::swap((*this)[i++],(*this)[j--]);
              }
            } while (i<=j);
          } else {
            do {
              while ((*this)[i]>pivot) ++i;
              while ((*this)[j]<pivot) --j;
              if (i<=j) {
                if (is_permutations) cimg::swap(permutations[i],permutations[j]);
                cimg::swap((*this)[i++],(*this)[j--]);
              }
            } while (i<=j);
          }
          if (indm<j) _quicksort(indm,j,permutations,increasing,is_permutations);
          if (i<indM) _quicksort(i,indM,permutations,increasing,is_permutations);
        }
      }
      return *this;
    }

    //! Compute the SVD of a general matrix.
    template<typename t>
    const CImg<T>& SVD(CImg<t>& U, CImg<t>& S, CImg<t>& V, const bool sorting=true,
                       const unsigned int max_iteration=40, const float lambda=0) const {
      if (is_empty()) { U.assign(); S.assign(); V.assign(); }
      else {
        U = *this;
        if (lambda!=0) {
          const unsigned int delta = cimg::min(U._width,U._height);
          for (unsigned int i = 0; i<delta; ++i) U(i,i) = (t)(U(i,i) + lambda);
        }
        if (S.size()<_width) S.assign(1,_width);
        if (V._width<_width || V._height<_height) V.assign(_width,_width);
        CImg<t> rv1(_width);
        t anorm = 0, c, f, g = 0, h, s, scale = 0;
        int l = 0, nm = 0;

        cimg_forX(U,i) {
          l = i+1; rv1[i] = scale*g; g = s = scale = 0;
          if (i<height()) {
            for (int k = i; k<height(); ++k) scale+= cimg::abs(U(i,k));
            if (scale) {
              for (int k = i; k<height(); ++k) { U(i,k)/=scale; s+= U(i,k)*U(i,k); }
              f = U(i,i); g = (t)((f>=0?-1:1)*std::sqrt(s)); h=f*g-s; U(i,i) = f-g;
              for (int j = l; j<width(); ++j) {
                s = 0;
                for (int k=i; k<height(); ++k) s+= U(i,k)*U(j,k);
                f = s/h;
                for (int k = i; k<height(); ++k) U(j,k)+= f*U(i,k);
              }
              for (int k = i; k<height(); ++k) U(i,k)*= scale;
            }
          }
          S[i]=scale*g;

          g = s = scale = 0;
          if (i<height() && i!=width()-1) {
            for (int k = l; k<width(); ++k) scale+=cimg::abs(U(k,i));
            if (scale) {
              for (int k = l; k<width(); ++k) { U(k,i)/= scale; s+= U(k,i)*U(k,i); }
              f = U(l,i); g = (t)((f>=0?-1:1)*std::sqrt(s)); h = f*g-s; U(l,i) = f-g;
              for (int k = l; k<width(); ++k) rv1[k]=U(k,i)/h;
              for (int j = l; j<height(); ++j) {
                s = 0;
                for (int k = l; k<width(); ++k) s+= U(k,j)*U(k,i);
                for (int k = l; k<width(); ++k) U(k,j)+= s*rv1[k];
              }
              for (int k = l; k<width(); ++k) U(k,i)*= scale;
            }
          }
          anorm = (t)cimg::max((float)anorm,(float)(cimg::abs(S[i])+cimg::abs(rv1[i])));
        }

        for (int i = width()-1; i>=0; --i) {
          if (i<width()-1) {
            if (g) {
              for (int j = l; j<width(); ++j) V(i,j) =(U(j,i)/U(l,i))/g;
              for (int j = l; j<width(); ++j) {
                s = 0;
                for (int k = l; k<width(); ++k) s+= U(k,i)*V(j,k);
                for (int k = l; k<width(); ++k) V(j,k)+= s*V(i,k);
              }
            }
            for (int j = l; j<width(); ++j) V(j,i) = V(i,j) = (t)0.0;
          }
          V(i,i) = (t)1.0; g = rv1[i]; l = i;
        }

        for (int i = cimg::min(width(),height())-1; i>=0; --i) {
          l = i+1; g = S[i];
          for (int j = l; j<width(); ++j) U(j,i) = 0;
          if (g) {
            g = 1/g;
            for (int j = l; j<width(); ++j) {
              s = 0; for (int k = l; k<height(); ++k) s+= U(i,k)*U(j,k);
              f = (s/U(i,i))*g;
              for (int k = i; k<height(); ++k) U(j,k)+= f*U(i,k);
            }
            for (int j = i; j<height(); ++j) U(i,j)*= g;
          } else for (int j = i; j<height(); ++j) U(i,j) = 0;
          ++U(i,i);
        }

        for (int k = width()-1; k>=0; --k) {
          for (unsigned int its = 0; its<max_iteration; ++its) {
            bool flag = true;
            for (l = k; l>=1; --l) {
              nm = l-1;
              if ((cimg::abs(rv1[l])+anorm)==anorm) { flag = false; break; }
              if ((cimg::abs(S[nm])+anorm)==anorm) break;
            }
            if (flag) {
              c = 0; s = 1;
              for (int i = l; i<=k; ++i) {
                f = s*rv1[i]; rv1[i] = c*rv1[i];
                if ((cimg::abs(f)+anorm)==anorm) break;
                g = S[i]; h = (t)cimg::_pythagore(f,g); S[i] = h; h = 1/h; c = g*h; s = -f*h;
                cimg_forY(U,j) { const t y = U(nm,j), z = U(i,j); U(nm,j) = y*c + z*s; U(i,j) = z*c - y*s; }
              }
            }
            const t z = S[k];
            if (l==k) { if (z<0) { S[k] = -z; cimg_forX(U,j) V(k,j) = -V(k,j); } break; }
            nm = k-1;
            t x = S[l], y = S[nm];
            g = rv1[nm]; h = rv1[k];
            f = ((y-z)*(y+z)+(g-h)*(g+h))/(2*h*y);
            g = (t)cimg::_pythagore(f,1.0);
            f = ((x-z)*(x+z)+h*((y/(f+ (f>=0?g:-g)))-h))/x;
            c = s = 1;
            for (int j = l; j<=nm; ++j) {
              const int i = j+1;
              g = rv1[i]; h = s*g; g = c*g;
              t y = S[i];
              t z = (t)cimg::_pythagore(f,h);
              rv1[j] = z; c = f/z; s = h/z;
              f = x*c+g*s; g = g*c-x*s; h = y*s; y*=c;
              cimg_forX(U,jj) { const t x = V(j,jj), z = V(i,jj); V(j,jj) = x*c + z*s; V(i,jj) = z*c - x*s; }
              z = (t)cimg::_pythagore(f,h); S[j] = z;
              if (z) { z = 1/z; c = f*z; s = h*z; }
              f = c*g+s*y; x = c*y-s*g;
              cimg_forY(U,jj) { const t y = U(j,jj); z = U(i,jj); U(j,jj) = y*c + z*s; U(i,jj) = z*c - y*s; }
            }
            rv1[l] = 0; rv1[k]=f; S[k]=x;
          }
        }

        if (sorting) {
          CImg<intT> permutations;
          CImg<t> tmp(_width);
          S.sort(permutations,false);
          cimg_forY(U,k) {
            cimg_forY(permutations,y) tmp(y) = U(permutations(y),k);
            std::memcpy(U.data(0,k),tmp._data,sizeof(t)*_width);
          }
          cimg_forY(V,k) {
            cimg_forY(permutations,y) tmp(y) = V(permutations(y),k);
            std::memcpy(V.data(0,k),tmp._data,sizeof(t)*_width);
          }
        }
      }
      return *this;
    }

    CImgList<Tfloat> get_SVD(const bool sorting=true,
                             const unsigned int max_iteration=40, const float lambda=0) const {
      CImgList<Tfloat> res(3);
      SVD(res[0],res[1],res[2],sorting,max_iteration,lambda);
      return res;
    }

    // INNER ROUTINE : Compute the LU decomposition of a permuted matrix (c.f. numerical recipies)
    template<typename t>
    CImg<T>& _LU(CImg<t>& indx, bool& d) {
      const int N = width();
      int imax = 0;
      CImg<Tfloat> vv(N);
      indx.assign(N);
      d = true;
      cimg_forX(*this,i) {
        Tfloat vmax = 0;
        cimg_forX(*this,j) {
          const Tfloat tmp = cimg::abs((*this)(j,i));
          if (tmp>vmax) vmax = tmp;
        }
        if (vmax==0) { indx.fill(0); return fill(0); }
        vv[i] = 1/vmax;
      }
      cimg_forX(*this,j) {
        for (int i = 0; i<j; ++i) {
          Tfloat sum=(*this)(j,i);
          for (int k = 0; k<i; ++k) sum-=(*this)(k,i)*(*this)(j,k);
          (*this)(j,i) = (T)sum;
        }
        Tfloat vmax = 0;
        for (int i = j; i<width(); ++i) {
          Tfloat sum=(*this)(j,i);
          for (int k = 0; k<j; ++k) sum-=(*this)(k,i)*(*this)(j,k);
          (*this)(j,i) = (T)sum;
          const Tfloat tmp = vv[i]*cimg::abs(sum);
          if (tmp>=vmax) { vmax=tmp; imax=i; }
        }
        if (j!=imax) {
          cimg_forX(*this,k) cimg::swap((*this)(k,imax),(*this)(k,j));
          d =!d;
          vv[imax] = vv[j];
        }
        indx[j] = (t)imax;
        if ((*this)(j,j)==0) (*this)(j,j) = (T)1e-20;
        if (j<N) {
          const Tfloat tmp = 1/(Tfloat)(*this)(j,j);
          for (int i=j+1; i<N; ++i) (*this)(j,i) = (T)((*this)(j,i)*tmp);
        }
      }
      return *this;
    }

    //! Compute minimal path in a graph, using the Dijkstra algorithm.
    /**
       \param distance An object having operator()(unsigned int i, unsigned int j) which returns distance between two nodes (i,j).
       \param nb_nodes Number of graph nodes.
       \param starting_node Indice of the starting node.
       \param ending_node Indice of the ending node (set to ~0U to ignore ending node).
       \param previous Array that gives the previous node indice in the path to the starting node (optional parameter).
       \return Array of distances of each node to the starting node.
    **/
    template<typename tf, typename t>
    static CImg<T> dijkstra(const tf& distance, const unsigned int nb_nodes,
                            const unsigned int starting_node, const unsigned int ending_node,
                            CImg<t>& previous) {
      if (starting_node>=nb_nodes)
        throw CImgArgumentException("CImg<%s>::dijkstra() : Specified indice of starting node %u is higher than number of nodes %u.",
                                    pixel_type(),starting_node,nb_nodes);
      CImg<T> dist(1,nb_nodes,1,1,cimg::type<T>::max());
      dist(starting_node) = 0;
      previous.assign(1,nb_nodes,1,1,(t)-1);
      previous(starting_node) = (t)starting_node;
      CImg<uintT> Q(nb_nodes);
      cimg_forX(Q,u) Q(u) = u;
      cimg::swap(Q(starting_node),Q(0));
      unsigned int sizeQ = nb_nodes;
      while (sizeQ) {
        // Update neighbors from minimal vertex
        const unsigned int umin = Q(0);
        if (umin==ending_node) sizeQ = 0;
        else {
          const T dmin = dist(umin);
          const T infty = cimg::type<T>::max();
          for (unsigned int q = 1; q<sizeQ; ++q) {
            const unsigned int v = Q(q);
            const T d = (T)distance(v,umin);
            if (d<infty) {
              const T alt = dmin + d;
              if (alt<dist(v)) {
                dist(v) = alt;
                previous(v) = (t)umin;
                const T distpos = dist(Q(q));
                for (unsigned int pos = q, par = 0; pos && distpos<dist(Q(par=(pos+1)/2-1)); pos=par) cimg::swap(Q(pos),Q(par));
              }
            }
          }
          // Remove minimal vertex from queue
          Q(0) = Q(--sizeQ);
          const T distpos = dist(Q(0));
          for (unsigned int pos = 0, left = 0, right = 0;
               ((right=2*(pos+1),(left=right-1))<sizeQ && distpos>dist(Q(left))) || (right<sizeQ && distpos>dist(Q(right)));) {
            if (right<sizeQ) {
              if (dist(Q(left))<dist(Q(right))) { cimg::swap(Q(pos),Q(left)); pos = left; }
              else { cimg::swap(Q(pos),Q(right)); pos = right; }
            } else { cimg::swap(Q(pos),Q(left)); pos = left; }
          }
        }
      }
      return dist;
    }

    //! Return minimal path in a graph, using the Dijkstra algorithm.
    template<typename tf, typename t>
    static CImg<T> dijkstra(const tf& distance, const unsigned int nb_nodes,
                            const unsigned int starting_node, const unsigned int ending_node=~0U) {
      CImg<uintT> foo;
      return dijkstra(distance,nb_nodes,starting_node,ending_node,foo);
    }

    //! Return minimal path in a graph, using the Dijkstra algorithm.
    /**
       Instance image corresponds to the adjacency matrix of the graph.
       \param starting_node Indice of the starting node.
       \param previous Array that gives the previous node indice in the path to the starting node (optional parameter).
       \return Array of distances of each node to the starting node.
    **/
    template<typename t>
    CImg<T>& dijkstra(const unsigned int starting_node, const unsigned int ending_node, CImg<t>& previous) {
      return get_dijkstra(starting_node,ending_node,previous).move_to(*this);
    }

    template<typename t>
    CImg<T> get_dijkstra(const unsigned int starting_node, const unsigned int ending_node, CImg<t>& previous) const {
      if (_width!=_height || _depth!=1 || _spectrum!=1)
        throw CImgInstanceException(_cimg_instance
                                    "dijkstra() : Instance is not a graph adjacency matrix.",
                                    cimg_instance);

      return dijkstra(*this,_width,starting_node,ending_node,previous);
    }

    //! Return minimal path in a graph, using the Dijkstra algorithm.
    CImg<T>& dijkstra(const unsigned int starting_node, const unsigned int ending_node=~0U) {
      return get_dijkstra(starting_node,ending_node).move_to(*this);
    }

    CImg<Tfloat> get_dijkstra(const unsigned int starting_node, const unsigned int ending_node=~0U) const {
      CImg<uintT> foo;
      return get_dijkstra(starting_node,ending_node,foo);
    }

    //! Return stream line of a 2d or 3d vector field.
    CImg<floatT> get_streamline(const float x, const float y, const float z,
                                const float L=256, const float dl=0.1f,
                                const unsigned int interpolation_type=2, const bool is_backward_tracking=false,
                                const bool is_oriented_only=false) const {
      if (_spectrum!=2 && _spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "streamline() : Instance is not a 2d or 3d vector field.",
                                    cimg_instance);
      if (_spectrum==2) {
        if (is_oriented_only) {
          typename CImg<T>::_functor4d_streamline2d_oriented func(*this);
          return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,true,0,0,0,_width-1.0f,_height-1.0f,0.0f);
        } else {
          typename CImg<T>::_functor4d_streamline2d_directed func(*this);
          return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,false,0,0,0,_width-1.0f,_height-1.0f,0.0f);
        }
      }
      if (is_oriented_only) {
        typename CImg<T>::_functor4d_streamline3d_oriented func(*this);
        return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,true,0,0,0,_width-1.0f,_height-1.0f,_depth-1.0f);
      }
      typename CImg<T>::_functor4d_streamline3d_directed func(*this);
      return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,false,0,0,0,_width-1.0f,_height-1.0f,_depth-1.0f);
    }

    //! Return stream line of a 3d vector field.
    /**
       \param interpolation_type Type of interpolation (can be 0=nearest int, 1=linear, 2=2nd-order RK, 3=4th-order RK.

     **/
    template<typename tfunc>
    static CImg<floatT> streamline(const tfunc& func,
                                   const float x, const float y, const float z,
                                   const float L=256, const float dl=0.1f,
                                   const unsigned int interpolation_type=2, const bool is_backward_tracking=false,
                                   const bool is_oriented_only=false,
                                   const float x0=0, const float y0=0, const float z0=0,
                                   const float x1=0, const float y1=0, const float z1=0) {
      if (dl<=0)
        throw CImgArgumentException("CImg<%s>::streamline() : Invalid specified integration length %g "
                                    "(should be >0).",
                                    pixel_type(),
                                    dl);

      const bool is_bounded = (x0!=x1 || y0!=y1 || z0!=z1);
      if (L<=0 || (is_bounded && (x<x0 || x>x1 || y<y0 || y>y1 || z<z0 || z>z1))) return CImg<floatT>();
      const unsigned int size_L = (unsigned int)cimg::round(L/dl+1);
      CImg<floatT> coordinates(size_L,3);
      const float dl2 = dl/2;
      float
        *ptr_x = coordinates.data(0,0),
        *ptr_y = coordinates.data(0,1),
        *ptr_z = coordinates.data(0,2),
        pu = (float)(dl*func(x,y,z,0)),
        pv = (float)(dl*func(x,y,z,1)),
        pw = (float)(dl*func(x,y,z,2)),
        X = x, Y = y, Z = z;

      switch (interpolation_type) {
      case 0 : { // Nearest integer interpolation.
        cimg_forX(coordinates,l) {
          *(ptr_x++) = X; *(ptr_y++) = Y; *(ptr_z++) = Z;
          const int
            xi = (int)(X>0?X+0.5f:X-0.5f),
            yi = (int)(Y>0?Y+0.5f:Y-0.5f),
            zi = (int)(Z>0?Z+0.5f:Z-0.5f);
          float
            u = (float)(dl*func((float)xi,(float)yi,(float)zi,0)),
            v = (float)(dl*func((float)xi,(float)yi,(float)zi,1)),
            w = (float)(dl*func((float)xi,(float)yi,(float)zi,2));
          if (is_oriented_only && u*pu + v*pv + w*pw<0) { u = -u; v = -v; w = -w; }
          if (is_backward_tracking) { X-=(pu=u); Y-=(pv=v); Z-=(pw=w); } else { X+=(pu=u); Y+=(pv=v); Z+=(pw=w); }
          if (is_bounded && (X<x0 || X>x1 || Y<y0 || Y>y1 || Z<z0 || Z>z1)) break;
        }
      } break;
      case 1 : { // First-order interpolation.
        cimg_forX(coordinates,l) {
          *(ptr_x++) = X; *(ptr_y++) = Y; *(ptr_z++) = Z;
          float
            u = (float)(dl*func(X,Y,Z,0)),
            v = (float)(dl*func(X,Y,Z,1)),
            w = (float)(dl*func(X,Y,Z,2));
          if (is_oriented_only && u*pu + v*pv + w*pw<0) { u = -u; v = -v; w = -w; }
          if (is_backward_tracking) { X-=(pu=u); Y-=(pv=v); Z-=(pw=w); } else { X+=(pu=u); Y+=(pv=v); Z+=(pw=w); }
          if (is_bounded && (X<x0 || X>x1 || Y<y0 || Y>y1 || Z<z0 || Z>z1)) break;
        }
      } break;
      case 2 : { // Second order interpolation.
        cimg_forX(coordinates,l) {
          *(ptr_x++) = X; *(ptr_y++) = Y; *(ptr_z++) = Z;
          float
            u0 = (float)(dl2*func(X,Y,Z,0)),
            v0 = (float)(dl2*func(X,Y,Z,1)),
            w0 = (float)(dl2*func(X,Y,Z,2));
          if (is_oriented_only && u0*pu + v0*pv + w0*pw<0) { u0 = -u0; v0 = -v0; w0 = -w0; }
          float
            u = (float)(dl*func(X+u0,Y+v0,Z+w0,0)),
            v = (float)(dl*func(X+u0,Y+v0,Z+w0,1)),
            w = (float)(dl*func(X+u0,Y+v0,Z+w0,2));
          if (is_oriented_only && u*pu + v*pv + w*pw<0) { u = -u; v = -v; w = -w; }
          if (is_backward_tracking) { X-=(pu=u); Y-=(pv=v); Z-=(pw=w); } else { X+=(pu=u); Y+=(pv=v); Z+=(pw=w); }
          if (is_bounded && (X<x0 || X>x1 || Y<y0 || Y>y1 || Z<z0 || Z>z1)) break;
        }
      } break;
      default : { // Fourth order interpolation.
        cimg_forX(coordinates,x) {
          *(ptr_x++) = X; *(ptr_y++) = Y; *(ptr_z++) = Z;
          float
            u0 = (float)(dl2*func(X,Y,Z,0)),
            v0 = (float)(dl2*func(X,Y,Z,1)),
            w0 = (float)(dl2*func(X,Y,Z,2));
          if (is_oriented_only && u0*pu + v0*pv + w0*pw<0) { u0 = -u0; v0 = -v0; w0 = -w0; }
          float
            u1 = (float)(dl2*func(X+u0,Y+v0,Z+w0,0)),
            v1 = (float)(dl2*func(X+u0,Y+v0,Z+w0,1)),
            w1 = (float)(dl2*func(X+u0,Y+v0,Z+w0,2));
          if (is_oriented_only && u1*pu + v1*pv + w1*pw<0) { u1 = -u1; v1 = -v1; w1 = -w1; }
          float
            u2 = (float)(dl2*func(X+u1,Y+v1,Z+w1,0)),
            v2 = (float)(dl2*func(X+u1,Y+v1,Z+w1,1)),
            w2 = (float)(dl2*func(X+u1,Y+v1,Z+w1,2));
          if (is_oriented_only && u2*pu + v2*pv + w2*pw<0) { u2 = -u2; v2 = -v2; w2 = -w2; }
          float
            u3 = (float)(dl2*func(X+u2,Y+v2,Z+w2,0)),
            v3 = (float)(dl2*func(X+u2,Y+v2,Z+w2,1)),
            w3 = (float)(dl2*func(X+u2,Y+v2,Z+w2,2));
          if (is_oriented_only && u2*pu + v2*pv + w2*pw<0) { u3 = -u3; v3 = -v3; w3 = -w3; }
          const float
            u = (u0 + u3)/3 + (u1 + u2)/1.5f,
            v = (v0 + v3)/3 + (v1 + v2)/1.5f,
            w = (w0 + w3)/3 + (w1 + w2)/1.5f;
          if (is_backward_tracking) { X-=(pu=u); Y-=(pv=v); Z-=(pw=w); } else { X+=(pu=u); Y+=(pv=v); Z+=(pw=w); }
          if (is_bounded && (X<x0 || X>x1 || Y<y0 || Y>y1 || Z<z0 || Z>z1)) break;
        }
      }
      }
      if (ptr_x!=coordinates.data(0,1)) coordinates.resize((int)(ptr_x-coordinates.data()),3,1,1,0);
      return coordinates;
    }

    //! Return stream line of a vector field.
    static CImg<floatT> streamline(const char *const expression,
                                   const float x, const float y, const float z,
                                   const float L=256, const float dl=0.1f,
                                   const unsigned int interpolation_type=2, const bool is_backward_tracking=true,
                                   const bool is_oriented_only=false,
                                   const float x0=0, const float y0=0, const float z0=0,
                                   const float x1=0, const float y1=0, const float z1=0) {
      _functor4d_streamline_expr func(expression);
      return streamline(func,x,y,z,L,dl,interpolation_type,is_backward_tracking,is_oriented_only,x0,y0,z0,x1,y1,z1);
    }

    struct _functor4d_streamline2d_directed {
      const CImg<T>& ref;
      _functor4d_streamline2d_directed(const CImg<T>& pref):ref(pref) {}
      float operator()(const float x, const float y, const float z, const unsigned int c) const {
        return c<2?(float)ref._linear_atXY(x,y,(int)z,c):0;
      }
    };

    struct _functor4d_streamline3d_directed {
      const CImg<T>& ref;
      _functor4d_streamline3d_directed(const CImg<T>& pref):ref(pref) {}
      float operator()(const float x, const float y, const float z, const unsigned int c) const {
        return (float)ref._linear_atXYZ(x,y,z,c);
      }
    };

    struct _functor4d_streamline2d_oriented {
      const CImg<T>& ref;
      CImg<floatT> *pI;
      _functor4d_streamline2d_oriented(const CImg<T>& pref):ref(pref),pI(0) { pI = new CImg<floatT>(2,2,1,2); }
      ~_functor4d_streamline2d_oriented() { delete pI; }
      float operator()(const float x, const float y, const float z, const unsigned int c) const {
#define _cimg_vecalign2d(i,j) if (I(i,j,0)*I(0,0,0)+I(i,j,1)*I(0,0,1)<0) { I(i,j,0) = -I(i,j,0); I(i,j,1) = -I(i,j,1); }
        int
          xi = (int)x - (x>=0?0:1), nxi = xi + 1,
          yi = (int)y - (y>=0?0:1), nyi = yi + 1,
          zi = (int)z;
        const float
          dx = x - xi,
          dy = y - yi;
        if (c==0) {
          CImg<floatT>& I = *pI;
          if (xi<0) xi = 0; if (nxi<0) nxi = 0;
          if (xi>=ref.width()) xi = ref.width()-1; if (nxi>=ref.width()) nxi = ref.width()-1;
          if (yi<0) yi = 0; if (nyi<0) nyi = 0;
          if (yi>=ref.height()) yi = ref.height()-1; if (nyi>=ref.height()) nyi = ref.height()-1;
          I(0,0,0) = (float)ref(xi,yi,zi,0); I(0,0,1) = (float)ref(xi,yi,zi,1);
          I(1,0,0) = (float)ref(nxi,yi,zi,0); I(1,0,1) = (float)ref(nxi,yi,zi,1);
          I(1,1,0) = (float)ref(nxi,nyi,zi,0); I(1,1,1) = (float)ref(nxi,nyi,zi,1);
          I(0,1,0) = (float)ref(xi,nyi,zi,0); I(0,1,1) = (float)ref(xi,nyi,zi,1);
          _cimg_vecalign2d(1,0); _cimg_vecalign2d(1,1); _cimg_vecalign2d(0,1);
        }
        return c<2?(float)pI->_linear_atXY(dx,dy,0,c):0;
      }
    };

    struct _functor4d_streamline3d_oriented {
      const CImg<T>& ref;
      CImg<floatT> *pI;
      _functor4d_streamline3d_oriented(const CImg<T>& pref):ref(pref),pI(0) { pI = new CImg<floatT>(2,2,2,3); }
      ~_functor4d_streamline3d_oriented() { delete pI; }
      float operator()(const float x, const float y, const float z, const unsigned int c) const {
#define _cimg_vecalign3d(i,j,k) if (I(i,j,k,0)*I(0,0,0,0)+I(i,j,k,1)*I(0,0,0,1)+I(i,j,k,2)*I(0,0,0,2)<0) { \
  I(i,j,k,0) = -I(i,j,k,0); I(i,j,k,1) = -I(i,j,k,1); I(i,j,k,2) = -I(i,j,k,2); }
        int
          xi = (int)x - (x>=0?0:1), nxi = xi + 1,
          yi = (int)y - (y>=0?0:1), nyi = yi + 1,
          zi = (int)z - (z>=0?0:1), nzi = zi + 1;
        const float
          dx = x - xi,
          dy = y - yi,
          dz = z - zi;
        if (c==0) {
          CImg<floatT>& I = *pI;
          if (xi<0) xi = 0; if (nxi<0) nxi = 0;
          if (xi>=ref.width()) xi = ref.width()-1; if (nxi>=ref.width()) nxi = ref.width()-1;
          if (yi<0) yi = 0; if (nyi<0) nyi = 0;
          if (yi>=ref.height()) yi = ref.height()-1; if (nyi>=ref.height()) nyi = ref.height()-1;
          if (zi<0) zi = 0; if (nzi<0) nzi = 0;
          if (zi>=ref.depth()) zi = ref.depth()-1; if (nzi>=ref.depth()) nzi = ref.depth()-1;
          I(0,0,0,0) = (float)ref(xi,yi,zi,0); I(0,0,0,1) = (float)ref(xi,yi,zi,1); I(0,0,0,2) = (float)ref(xi,yi,zi,2);
          I(1,0,0,0) = (float)ref(nxi,yi,zi,0); I(1,0,0,1) = (float)ref(nxi,yi,zi,1); I(1,0,0,2) = (float)ref(nxi,yi,zi,2);
          I(1,1,0,0) = (float)ref(nxi,nyi,zi,0); I(1,1,0,1) = (float)ref(nxi,nyi,zi,1); I(1,1,0,2) = (float)ref(nxi,nyi,zi,2);
          I(0,1,0,0) = (float)ref(xi,nyi,zi,0); I(0,1,0,1) = (float)ref(xi,nyi,zi,1); I(0,1,0,2) = (float)ref(xi,yi,zi,2);
          I(0,0,0,1) = (float)ref(xi,yi,nzi,0); I(0,0,0,1) = (float)ref(xi,yi,nzi,1); I(0,0,0,2) = (float)ref(xi,yi,nzi,2);
          I(1,0,0,1) = (float)ref(nxi,yi,nzi,0); I(1,0,0,1) = (float)ref(nxi,yi,nzi,1); I(1,0,0,2) = (float)ref(nxi,yi,nzi,2);
          I(1,1,0,1) = (float)ref(nxi,nyi,nzi,0); I(1,1,0,1) = (float)ref(nxi,nyi,nzi,1); I(1,1,0,2) = (float)ref(nxi,nyi,nzi,2);
          I(0,1,0,1) = (float)ref(xi,nyi,nzi,0); I(0,1,0,1) = (float)ref(xi,nyi,nzi,1); I(0,1,0,2) = (float)ref(xi,yi,nzi,2);
          _cimg_vecalign3d(1,0,0); _cimg_vecalign3d(1,1,0); _cimg_vecalign3d(0,1,0);
          _cimg_vecalign3d(0,0,1); _cimg_vecalign3d(1,0,1); _cimg_vecalign3d(1,1,1); _cimg_vecalign3d(0,1,1);
        }
        return (float)pI->_linear_atXYZ(dx,dy,dz,c);
      }
    };

    struct _functor4d_streamline_expr {
      _cimg_math_parser *mp;
      ~_functor4d_streamline_expr() { delete mp; }
      _functor4d_streamline_expr(const char *const expr):mp(0) { mp = new _cimg_math_parser(CImg<T>::empty(),expr,"streamline"); }
      float operator()(const float x, const float y, const float z, const unsigned int c) const {
        return (float)mp->eval(x,y,z,c);
      }
    };

    //! Return an image containing the specified string.
    static CImg<T> string(const char *const str) {
      if (!str) return CImg<T>();
      return CImg<T>(str,std::strlen(str)+1);
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0) {
      _cimg_static CImg<T> r(1,1);
      r[0] = a0;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1) {
      _cimg_static CImg<T> r(1,2); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2) {
      _cimg_static CImg<T> r(1,3); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3) {
      _cimg_static CImg<T> r(1,4); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3, const T& a4) {
      _cimg_static CImg<T> r(1,5); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3; *(ptr++) = a4;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3, const T& a4, const T& a5) {
      _cimg_static CImg<T> r(1,6); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3; *(ptr++) = a4; *(ptr++) = a5;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6) {
      _cimg_static CImg<T> r(1,7); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7) {
      _cimg_static CImg<T> r(1,8); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7,
                          const T& a8) {
      _cimg_static CImg<T> r(1,9); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      *(ptr++) = a8;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7,
                          const T& a8, const T& a9) {
      _cimg_static CImg<T> r(1,10); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      *(ptr++) = a8; *(ptr++) = a9;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7,
                          const T& a8, const T& a9, const T& a10) {
      _cimg_static CImg<T> r(1,11); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7,
                          const T& a8, const T& a9, const T& a10, const T& a11) {
      _cimg_static CImg<T> r(1,12); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7,
                          const T& a8, const T& a9, const T& a10, const T& a11,
                          const T& a12) {
      _cimg_static CImg<T> r(1,13); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
      *(ptr++) = a12;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7,
                          const T& a8, const T& a9, const T& a10, const T& a11,
                          const T& a12, const T& a13) {
      _cimg_static CImg<T> r(1,14); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
      *(ptr++) = a12; *(ptr++) = a13;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7,
                          const T& a8, const T& a9, const T& a10, const T& a11,
                          const T& a12, const T& a13, const T& a14) {
      _cimg_static CImg<T> r(1,15); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
      *(ptr++) = a12; *(ptr++) = a13; *(ptr++) = a14;
      return r;
    }

    //! Return a vector with specified coefficients.
    static CImg<T> vector(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7,
                          const T& a8, const T& a9, const T& a10, const T& a11,
                          const T& a12, const T& a13, const T& a14, const T& a15) {
      _cimg_static CImg<T> r(1,16); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
      *(ptr++) = a12; *(ptr++) = a13; *(ptr++) = a14; *(ptr++) = a15;
      return r;
    }

    //! Return a 1x1 square matrix with specified coefficients.
    static CImg<T> matrix(const T& a0) {
      return vector(a0);
    }

    //! Return a 2x2 square matrix with specified coefficients.
    static CImg<T> matrix(const T& a0, const T& a1,
                          const T& a2, const T& a3) {
      _cimg_static CImg<T> r(2,2); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1;
      *(ptr++) = a2; *(ptr++) = a3;
      return r;
    }

    //! Return a 3x3 square matrix with specified coefficients.
    static CImg<T> matrix(const T& a0, const T& a1, const T& a2,
                          const T& a3, const T& a4, const T& a5,
                          const T& a6, const T& a7, const T& a8) {
      _cimg_static CImg<T> r(3,3); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2;
      *(ptr++) = a3; *(ptr++) = a4; *(ptr++) = a5;
      *(ptr++) = a6; *(ptr++) = a7; *(ptr++) = a8;
      return r;
    }

    //! Return a 4x4 square matrix with specified coefficients.
    static CImg<T> matrix(const T& a0, const T& a1, const T& a2, const T& a3,
                          const T& a4, const T& a5, const T& a6, const T& a7,
                          const T& a8, const T& a9, const T& a10, const T& a11,
                          const T& a12, const T& a13, const T& a14, const T& a15) {
      _cimg_static CImg<T> r(4,4); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3;
      *(ptr++) = a4; *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7;
      *(ptr++) = a8; *(ptr++) = a9; *(ptr++) = a10; *(ptr++) = a11;
      *(ptr++) = a12; *(ptr++) = a13; *(ptr++) = a14; *(ptr++) = a15;
      return r;
    }

    //! Return a 5x5 square matrix with specified coefficients.
    static CImg<T> matrix(const T& a0, const T& a1, const T& a2, const T& a3, const T& a4,
                          const T& a5, const T& a6, const T& a7, const T& a8, const T& a9,
                          const T& a10, const T& a11, const T& a12, const T& a13, const T& a14,
                          const T& a15, const T& a16, const T& a17, const T& a18, const T& a19,
                          const T& a20, const T& a21, const T& a22, const T& a23, const T& a24) {
      _cimg_static CImg<T> r(5,5); T *ptr = r._data;
      *(ptr++) = a0; *(ptr++) = a1; *(ptr++) = a2; *(ptr++) = a3; *(ptr++) = a4;
      *(ptr++) = a5; *(ptr++) = a6; *(ptr++) = a7; *(ptr++) = a8; *(ptr++) = a9;
      *(ptr++) = a10; *(ptr++) = a11; *(ptr++) = a12; *(ptr++) = a13; *(ptr++) = a14;
      *(ptr++) = a15; *(ptr++) = a16; *(ptr++) = a17; *(ptr++) = a18; *(ptr++) = a19;
      *(ptr++) = a20; *(ptr++) = a21; *(ptr++) = a22; *(ptr++) = a23; *(ptr++) = a24;
      return r;
    }

    //! Return a 1x1 symmetric matrix with specified coefficients.
    static CImg<T> tensor(const T& a1) {
      return matrix(a1);
    }

    //! Return a 2x2 symmetric matrix tensor with specified coefficients.
    static CImg<T> tensor(const T& a1, const T& a2, const T& a3) {
      return matrix(a1,a2,a2,a3);
    }

    //! Return a 3x3 symmetric matrix with specified coefficients.
    static CImg<T> tensor(const T& a1, const T& a2, const T& a3, const T& a4, const T& a5, const T& a6) {
      return matrix(a1,a2,a3,a2,a4,a5,a3,a5,a6);
    }

    //! Return a 1x1 diagonal matrix with specified coefficients.
    static CImg<T> diagonal(const T& a0) {
      return matrix(a0);
    }

    //! Return a 2x2 diagonal matrix with specified coefficients.
    static CImg<T> diagonal(const T& a0, const T& a1) {
      return matrix(a0,0,0,a1);
    }

    //! Return a 3x3 diagonal matrix with specified coefficients.
    static CImg<T> diagonal(const T& a0, const T& a1, const T& a2) {
      return matrix(a0,0,0,0,a1,0,0,0,a2);
    }

    //! Return a 4x4 diagonal matrix with specified coefficients.
    static CImg<T> diagonal(const T& a0, const T& a1, const T& a2, const T& a3) {
      return matrix(a0,0,0,0,0,a1,0,0,0,0,a2,0,0,0,0,a3);
    }

    //! Return a 5x5 diagonal matrix with specified coefficients.
    static CImg<T> diagonal(const T& a0, const T& a1, const T& a2, const T& a3, const T& a4) {
      return matrix(a0,0,0,0,0,0,a1,0,0,0,0,0,a2,0,0,0,0,0,a3,0,0,0,0,0,a4);
    }

    //! Return a NxN identity matrix.
    static CImg<T> identity_matrix(const unsigned int N) {
      CImg<T> res(N,N,1,1,0);
      cimg_forX(res,x) res(x,x) = 1;
      return res;
    }

    //! Return a N-numbered sequence vector from \p a0 to \p a1.
    static CImg<T> sequence(const unsigned int N, const T a0, const T a1) {
      if (N) return CImg<T>(1,N).sequence(a0,a1);
      return CImg<T>();
    }

    //! Return a 3x3 rotation matrix along the (x,y,z)-axis with an angle w.
    static CImg<T> rotation_matrix(const float x, const float y, const float z, const float w, const bool quaternion_data=false) {
      float X,Y,Z,W;
      if (!quaternion_data) {
        const float norm = (float)std::sqrt(x*x + y*y + z*z),
          nx = norm>0?x/norm:0,
          ny = norm>0?y/norm:0,
          nz = norm>0?z/norm:1,
          nw = norm>0?w:0,
          sina = (float)std::sin(nw/2),
          cosa = (float)std::cos(nw/2);
        X = nx*sina;
        Y = ny*sina;
        Z = nz*sina;
        W = cosa;
      } else {
        const float norm = (float)std::sqrt(x*x + y*y + z*z + w*w);
        if (norm>0) { X = x/norm; Y = y/norm; Z = z/norm; W = w/norm; }
        else { X = Y = Z = 0; W = 1; }
      }
      const float xx = X*X, xy = X*Y, xz = X*Z, xw = X*W, yy = Y*Y, yz = Y*Z, yw = Y*W, zz = Z*Z, zw = Z*W;
      return CImg<T>::matrix((T)(1-2*(yy+zz)), (T)(2*(xy+zw)),   (T)(2*(xz-yw)),
                             (T)(2*(xy-zw)),   (T)(1-2*(xx+zz)), (T)(2*(yz+xw)),
                             (T)(2*(xz+yw)),   (T)(2*(yz-xw)),   (T)(1-2*(xx+yy)));
    }

    //@}
    //-----------------------------------
    //
    //! \name Value Manipulation
    //@{
    //-----------------------------------

    //! Fill an image by a value \p val.
    /**
       \param val = fill value
       \note All pixel values of the instance image will be initialized by \p val.
    **/
    CImg<T>& fill(const T val) {
      if (is_empty()) return *this;
      if (val && sizeof(T)!=1) cimg_for(*this,ptrd,T) *ptrd = val;
      else std::memset(_data,(int)val,size()*sizeof(T));
      return *this;
    }

    CImg<T> get_fill(const T val) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val);
    }

    //! Fill sequentially all pixel values with values \a val0 and \a val1 respectively.
    CImg<T>& fill(const T val0, const T val1) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-1;
      for (ptrd = _data; ptrd<ptre; ) { *(ptrd++) = val0; *(ptrd++) = val1; }
      if (ptrd!=ptre+1) *(ptrd++) = val0;
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1);
    }

    //! Fill sequentially all pixel values with values \a val0 and \a val1 and \a val2.
    CImg<T>& fill(const T val0, const T val1, const T val2) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-2;
      for (ptrd = _data; ptrd<ptre; ) { *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; }
      ptre+=2;
      switch (ptre - ptrd) {
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2);
    }

    //! Fill sequentially all pixel values with values \a val0 and \a val1 and \a val2 and \a val3.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-3;
      for (ptrd = _data; ptrd<ptre; ) { *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; }
      ptre+=3;
      switch (ptre - ptrd) {
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3);
    }

    //! Fill sequentially all pixel values with values \a val0 and \a val1 and \a val2 and \a val3 and \a val4.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-4;
      for (ptrd = _data; ptrd<ptre; ) { *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; }
      ptre+=4;
      switch (ptre - ptrd) {
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4);
    }

    //! Fill sequentially all pixel values with values \a val0 and \a val1 and \a val2 and \a val3 and \a val4 and \a val5.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-5;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
      }
      ptre+=5;
      switch (ptre - ptrd) {
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-6;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5; *(ptrd++) = val6;
      }
      ptre+=6;
      switch (ptre - ptrd) {
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                  const T val7) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-7;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3;
        *(ptrd++) = val4; *(ptrd++) = val5; *(ptrd++) = val6; *(ptrd++) = val7;
      }
      ptre+=7;
      switch (ptre - ptrd) {
      case 7 : *(--ptre) = val6;
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                     const T val7) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                  const T val7, const T val8) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-8;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2;
        *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8;
      }
      ptre+=8;
      switch (ptre - ptrd) {
      case 8 : *(--ptre) = val7;
      case 7 : *(--ptre) = val6;
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                     const T val7, const T val8) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                  const T val7, const T val8, const T val9) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-9;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4;
        *(ptrd++) = val5; *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9;
      }
      ptre+=9;
      switch (ptre - ptrd) {
      case 9 : *(--ptre) = val8;
      case 8 : *(--ptre) = val7;
      case 7 : *(--ptre) = val6;
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                     const T val7, const T val8, const T val9) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                  const T val7, const T val8, const T val9, const T val10) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-10;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4;
        *(ptrd++) = val5; *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9;
        *(ptrd++) = val10;
      }
      ptre+=10;
      switch (ptre - ptrd) {
      case 10 : *(--ptre) = val9;
      case 9 : *(--ptre) = val8;
      case 8 : *(--ptre) = val7;
      case 7 : *(--ptre) = val6;
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                     const T val7, const T val8, const T val9, const T val10) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                  const T val7, const T val8, const T val9, const T val10, const T val11) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-11;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
      }
      ptre+=11;
      switch (ptre - ptrd) {
      case 11 : *(--ptre) = val10;
      case 10 : *(--ptre) = val9;
      case 9 : *(--ptre) = val8;
      case 8 : *(--ptre) = val7;
      case 7 : *(--ptre) = val6;
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                     const T val7, const T val8, const T val9, const T val10, const T val11) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,val11);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                  const T val7, const T val8, const T val9, const T val10, const T val11, const T val12) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-12;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
        *(ptrd++) = val12;
      }
      ptre+=12;
      switch (ptre - ptrd) {
      case 12 : *(--ptre) = val11;
      case 11 : *(--ptre) = val10;
      case 10 : *(--ptre) = val9;
      case 9 : *(--ptre) = val8;
      case 8 : *(--ptre) = val7;
      case 7 : *(--ptre) = val6;
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                     const T val7, const T val8, const T val9, const T val10, const T val11, const T val12) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,val11,val12);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                  const T val7, const T val8, const T val9, const T val10, const T val11, const T val12,
                  const T val13) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-13;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
        *(ptrd++) = val12; *(ptrd++) = val13;
      }
      ptre+=13;
      switch (ptre - ptrd) {
      case 13 : *(--ptre) = val12;
      case 12 : *(--ptre) = val11;
      case 11 : *(--ptre) = val10;
      case 10 : *(--ptre) = val9;
      case 9 : *(--ptre) = val8;
      case 8 : *(--ptre) = val7;
      case 7 : *(--ptre) = val6;
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                     const T val7, const T val8, const T val9, const T val10, const T val11, const T val12,
                     const T val13) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,val11,val12,
                                                  val13);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                  const T val7, const T val8, const T val9, const T val10, const T val11, const T val12,
                  const T val13, const T val14) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-14;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
        *(ptrd++) = val12; *(ptrd++) = val13; *(ptrd++) = val14;
      }
      ptre+=14;
      switch (ptre - ptrd) {
      case 14 : *(--ptre) = val13;
      case 13 : *(--ptre) = val12;
      case 12 : *(--ptre) = val11;
      case 11 : *(--ptre) = val10;
      case 10 : *(--ptre) = val9;
      case 9 : *(--ptre) = val8;
      case 8 : *(--ptre) = val7;
      case 7 : *(--ptre) = val6;
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                     const T val7, const T val8, const T val9, const T val10, const T val11, const T val12,
                     const T val13, const T val14) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,val11,val12,
                                                  val13,val14);
    }

    //! Fill sequentially pixel values.
    CImg<T>& fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                  const T val7, const T val8, const T val9, const T val10, const T val11, const T val12,
                  const T val13, const T val14, const T val15) {
      if (is_empty()) return *this;
      T *ptrd, *ptre = end()-15;
      for (ptrd = _data; ptrd<ptre; ) {
        *(ptrd++) = val0; *(ptrd++) = val1; *(ptrd++) = val2; *(ptrd++) = val3; *(ptrd++) = val4; *(ptrd++) = val5;
        *(ptrd++) = val6; *(ptrd++) = val7; *(ptrd++) = val8; *(ptrd++) = val9; *(ptrd++) = val10; *(ptrd++) = val11;
        *(ptrd++) = val12; *(ptrd++) = val13; *(ptrd++) = val14; *(ptrd++) = val15;
      }
      ptre+=15;
      switch (ptre - ptrd) {
      case 15 : *(--ptre) = val14;
      case 14 : *(--ptre) = val13;
      case 13 : *(--ptre) = val12;
      case 12 : *(--ptre) = val11;
      case 11 : *(--ptre) = val10;
      case 10 : *(--ptre) = val9;
      case 9 : *(--ptre) = val8;
      case 8 : *(--ptre) = val7;
      case 7 : *(--ptre) = val6;
      case 6 : *(--ptre) = val5;
      case 5 : *(--ptre) = val4;
      case 4 : *(--ptre) = val3;
      case 3 : *(--ptre) = val2;
      case 2 : *(--ptre) = val1;
      case 1 : *(--ptre) = val0;
      }
      return *this;
    }

    CImg<T> get_fill(const T val0, const T val1, const T val2, const T val3, const T val4, const T val5, const T val6,
                     const T val7, const T val8, const T val9, const T val10, const T val11, const T val12,
                     const T val13, const T val14, const T val15) const {
      return CImg<T>(_width,_height,_depth,_spectrum).fill(val0,val1,val2,val3,val4,val5,val6,val7,val8,val9,val10,val11,val12,
                                                  val13,val14,val15);
    }

    //! Fill image values according to the given expression, which can be a formula or a list of values.
    CImg<T>& fill(const char *const expression, const bool repeat_flag) {
      if (is_empty() || !expression || !*expression) return *this;
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try { // Try to fill values according to a formula.
        const CImg<T> _base = std::strstr(expression,"i(")?+*this:CImg<T>(), &base = _base?_base:*this;
        _cimg_math_parser mp(base,expression,"fill");
        T *ptrd = _data;
        cimg_forXYZC(*this,x,y,z,c) *(ptrd++) = (T)mp.eval((double)x,(double)y,(double)z,(double)c);
      } catch (CImgException& e) { // If failed, try to recognize a list of values.
        char item[16384] = { 0 }, sep = 0;
        const char *nexpression = expression;
        unsigned int nb = 0; const unsigned int siz = size();
        T *ptrd = _data;
        for (double val = 0; *nexpression && nb<siz; ++nb) {
          sep = 0;
          const int err = std::sscanf(nexpression,"%4095[ \n\t0-9.e+-]%c",item,&sep);
          if (err>0 && std::sscanf(item,"%lf",&val)==1) {
            nexpression+=std::strlen(item) + (err>1?1:0);
            *(ptrd++) = (T)val;
          } else break;
        }
        cimg::exception_mode() = omode;
        if (nb<siz && (sep || *nexpression))
          throw CImgArgumentException(e.what(),pixel_type(),expression);
        if (repeat_flag && nb && nb<siz) for (T *ptrs = _data, *const ptre = _data + siz; ptrd<ptre; ++ptrs) *(ptrd++) = *ptrs;
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    CImg<T> get_fill(const char *const values, const bool repeat_values) const {
      return (+*this).fill(values,repeat_values);
    }

    //! Fill image values according to the values found in the specified image.
    template<typename t>
    CImg<T>& fill(const CImg<t>& values, const bool repeat_values=true) {
      if (is_empty() || !values) return *this;
      T *ptrd = _data, *ptre = ptrd + size();
      for (t *ptrs = values._data, *ptrs_end = ptrs + values.size(); ptrs<ptrs_end && ptrd<ptre; ++ptrs) *(ptrd++) = (T)*ptrs;
      if (repeat_values && ptrd<ptre) for (T *ptrs = _data; ptrd<ptre; ++ptrs) *(ptrd++) = *ptrs;
      return *this;
    }

    template<typename t>
    CImg<T> get_fill(const CImg<t>& values, const bool repeat_values=true) const {
      return repeat_values?CImg<T>(_width,_height,_depth,_spectrum).fill(values,repeat_values):(+*this).fill(values,repeat_values);
    }

    //! Fill image values along the X-axis at the specified pixel position (y,z,c).
    CImg<T>& fillX(const unsigned int y, const unsigned int z, const unsigned int c, const int a0, ...) {
#define _cimg_fill1(x,y,z,c,off,siz,t) { \
    va_list ap; va_start(ap,a0); T *ptrd = data(x,y,z,c); *ptrd = (T)a0; \
    for (unsigned int k = 1; k<siz; ++k) { ptrd+=off; *ptrd = (T)va_arg(ap,t); } \
    va_end(ap); }
      if (y<_height && z<_depth && c<_spectrum) _cimg_fill1(0,y,z,c,1,_width,int);
      return *this;
    }

    CImg<T>& fillX(const unsigned int y, const unsigned int z, const unsigned int c, const double a0, ...) {
      if (y<_height && z<_depth && c<_spectrum) _cimg_fill1(0,y,z,c,1,_width,double);
      return *this;
    }

    //! Fill image values along the Y-axis at the specified pixel position (x,z,c).
    CImg<T>& fillY(const unsigned int x, const unsigned int z, const unsigned int c, const int a0, ...) {
      if (x<_width && z<_depth && c<_spectrum) _cimg_fill1(x,0,z,c,_width,_height,int);
      return *this;
    }

    CImg<T>& fillY(const unsigned int x, const unsigned int z, const unsigned int c, const double a0, ...) {
      if (x<_width && z<_depth && c<_spectrum) _cimg_fill1(x,0,z,c,_width,_height,double);
      return *this;
    }

    //! Fill image values along the Z-axis at the specified pixel position (x,y,c).
    CImg<T>& fillZ(const unsigned int x, const unsigned int y, const unsigned int c, const int a0, ...) {
      const unsigned int wh = _width*_height;
      if (x<_width && y<_height && c<_spectrum) _cimg_fill1(x,y,0,c,wh,_depth,int);
      return *this;
    }

    CImg<T>& fillZ(const unsigned int x, const unsigned int y, const unsigned int c, const double a0, ...) {
      const unsigned int wh = _width*_height;
      if (x<_width && y<_height && c<_spectrum) _cimg_fill1(x,y,0,c,wh,_depth,double);
      return *this;
    }

    //! Fill image values along the C-axis at the specified pixel position (x,y,z).
    CImg<T>& fillC(const unsigned int x, const unsigned int y, const unsigned int z, const int a0, ...) {
      const unsigned int whd = _width*_height*_depth;
      if (x<_width && y<_height && z<_depth) _cimg_fill1(x,y,z,0,whd,_spectrum,int);
      return *this;
    }

    CImg<T>& fillC(const unsigned int x, const unsigned int y, const unsigned int z, const double a0, ...) {
      const unsigned int whd = _width*_height*_depth;
      if (x<_width && y<_height && z<_depth) _cimg_fill1(x,y,z,0,whd,_spectrum,double);
      return *this;
    }

    //! Remove specified value from the image buffer, and return resulting buffer as a one-column vector.
    CImg<T>& discard(const T value) {
      return get_discard(value).move_to(*this);
    }

    CImg<T> get_discard(const T value) const {
      CImg<T> res(1,size());
      T *pd = res._data;
      for (const T *ps = _data, *const pse = end(); ps<pse; ++ps)
        if (*ps!=value) *(pd++) = *ps;
      if (pd==res._data) return CImg<T>();
      return res.resize(1,pd-res._data,1,1,-1);
    }

    //! Remove specified values sequence from the image buffer, and return resulting buffer as a one-column vector.
    template<typename t>
    CImg<T>& discard(const CImg<t>& values) {
      return get_discard(values).move_to(*this);
    }

    template<typename t>
    CImg<T> get_discard(const CImg<t>& values) const {
      if (!values) return *this;
      if (values.size()==1) return get_discard(*values);
      CImg<T> res(1,size());
      T *pd = res._data;
      const t *const pve = values.end();
      for (const T *ps = _data, *const pse = end(); ps<pse; ) {
        const T *_ps = ps;
        const t *pv = values._data;
        while (_ps<pse && pv<pve) { if (*(_ps++)!=(T)*pv) break; ++pv; }
        if (pv!=pve) {
          const unsigned int l = _ps - ps;
          if (l==1) *(pd++) = *ps; else { std::memcpy(pd,ps,sizeof(T)*l); pd+=l; }
        }
        ps = _ps;
      }
      if (pd==res._data) return CImg<T>();
      return res.resize(1,pd-res._data,1,1,-1);
    }

    //! Invert endianness of the image buffer.
    CImg<T>& invert_endianness() {
      cimg::invert_endianness(_data,size());
      return *this;
    }

    CImg<T> get_invert_endianness() const {
      return (+*this).invert_endianness();
    }

    //! Fill the instance image with random values between specified range.
    CImg<T>& rand(const T val_min, const T val_max) {
      const float delta = (float)val_max - (float)val_min;
      cimg_for(*this,ptrd,T) *ptrd = (T)(val_min + cimg::rand()*delta);
      return *this;
    }

    CImg<T> get_rand(const T val_min, const T val_max) const {
      return (+*this).rand(val_min,val_max);
    }

    //! Compute image with rounded pixel values.
    /**
       \param y Rounding precision.
       \param rounding_type Roundin type, can be 0 (nearest), 1 (forward), -1(backward).
    **/
    CImg<T>& round(const double y=1, const int rounding_type=0) {
      if (y>0) cimg_for(*this,ptrd,T) *ptrd = cimg::round(*ptrd,y,rounding_type);
      return *this;
    }

    CImg<T> get_round(const double y=1, const unsigned int rounding_type=0) const {
      return (+*this).round(y,rounding_type);
    }

    //! Add random noise to the values of the instance image.
    /**
       \param sigma Amplitude of the random additive noise. If \p sigma<0, it stands for a percentage of the global value range.
       \param noise_type Type of additive noise (can be \p 0=gaussian, \p 1=uniform, \p 2=Salt and Pepper, \p 3=Poisson or \p 4=Rician).
       \return A reference to the modified instance image.
       \note
       - For Poisson noise (\p noise_type=3), parameter \p sigma is ignored, as Poisson noise only depends on the image value itself.
       - Function \p CImg<T>::get_noise() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"), res = img.get_noise(40);
       (img,res.normalize(0,255)).display();
       \endcode
       \image html ref_noise.jpg
    **/
    CImg<T>& noise(const double sigma, const unsigned int noise_type=0) {
      if (!is_empty()) {
        const Tfloat vmin = (Tfloat)cimg::type<T>::min(), vmax = (Tfloat)cimg::type<T>::max();
        Tfloat nsigma = (Tfloat)sigma, m = 0, M = 0;
        if (nsigma==0 && noise_type!=3) return *this;
        if (nsigma<0 || noise_type==2) m = (Tfloat)min_max(M);
        if (nsigma<0) nsigma = (Tfloat)(-nsigma*(M-m)/100.0);
        switch (noise_type) {
        case 0 : { // Gaussian noise
          cimg_for(*this,ptrd,T) {
            Tfloat val = (Tfloat)(*ptrd + nsigma*cimg::grand());
            if (val>vmax) val = vmax;
            if (val<vmin) val = vmin;
            *ptrd = (T)val;
          }
        } break;
        case 1 : { // Uniform noise
          cimg_for(*this,ptrd,T) {
            Tfloat val = (Tfloat)(*ptrd + nsigma*cimg::crand());
            if (val>vmax) val = vmax;
            if (val<vmin) val = vmin;
            *ptrd = (T)val;
          }
        } break;
        case 2 : { // Salt & Pepper noise
          if (nsigma<0) nsigma = -nsigma;
          if (M==m) { m = 0; M = (Tfloat)(cimg::type<T>::is_float()?1:cimg::type<T>::max()); }
          cimg_for(*this,ptrd,T) if (cimg::rand()*100<nsigma) *ptrd = (T)(cimg::rand()<0.5?M:m);
        } break;

        case 3 : { // Poisson Noise
          cimg_for(*this,ptrd,T) *ptrd = (T)cimg::prand(*ptrd);
        } break;

        case 4 : { // Rice noise
          const Tfloat sqrt2 = (Tfloat)std::sqrt(2.0);
          cimg_for(*this,ptrd,T) {
            const Tfloat
              val0 = (Tfloat)*ptrd/sqrt2,
              re = (Tfloat)(val0 + nsigma*cimg::grand()),
              im = (Tfloat)(val0 + nsigma*cimg::grand());
            Tfloat val = (Tfloat)std::sqrt(re*re + im*im);
            if (val>vmax) val = vmax;
            if (val<vmin) val = vmin;
            *ptrd = (T)val;
          }
        } break;
        default :
          throw CImgArgumentException(_cimg_instance
                                      "noise() : Invalid specified noise type %d "
                                      "(should be { 0=gaussian | 1=uniform | 2=salt&Pepper | 3=poisson }).",
                                      cimg_instance,
                                      noise_type);
        }
      }
      return *this;
    }

    CImg<T> get_noise(const double sigma, const unsigned int noise_type=0) const {
      return (+*this).noise(sigma,noise_type);
    }

    //! Linearly normalize values of the instance image between \p value_min and \p value_max.
    /**
       \param value_min Minimum desired value of the resulting image.
       \param value_max Maximum desired value of the resulting image.
       \return A reference to the modified instance image.
       \note
       - Function \p CImg<T>::get_normalize() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"), res = img.get_normalize(160,220);
       (img,res).display();
       \endcode
       \image html ref_normalize2.jpg
    **/
    CImg<T>& normalize(const T value_min, const T value_max) {
      if (is_empty()) return *this;
      const T a = value_min<value_max?value_min:value_max, b = value_min<value_max?value_max:value_min;
      T m, M = max_min(m);
      const Tfloat fm = (Tfloat)m, fM = (Tfloat)M;
      if (m==M) return fill(0);
      if (m!=a || M!=b) cimg_for(*this,ptrd,T) *ptrd = (T)((*ptrd-fm)/(fM-fm)*(b-a)+a);
      return *this;
    }

    CImg<Tfloat> get_normalize(const T value_min, const T value_max) const {
      return CImg<Tfloat>(*this,false).normalize((Tfloat)value_min,(Tfloat)value_max);
    }

    //! Normalize multi-valued pixels of the instance image, with respect to their L2-norm.
    /**
       \return A reference to the modified instance image.
       \note
       - Function \p CImg<T>::get_normalize() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"), res = img.get_normalize();
       (img,res.normalize(0,255)).display();
       \endcode
       \image html ref_normalize.jpg
    **/
    CImg<T>& normalize() {
      T *ptrd = _data;
      const unsigned int whd = _width*_height*_depth;
      cimg_forXYZ(*this,x,y,z) {
        const T *ptrs = ptrd;
        float n = 0;
        cimg_forC(*this,c) { n+=cimg::sqr((float)*ptrs); ptrs+=whd; }
        n = (float)std::sqrt(n);
        T *_ptrd = ptrd++;
        if (n>0) cimg_forC(*this,c) { *_ptrd = (T)(*_ptrd/n); _ptrd+=whd; }
        else cimg_forC(*this,c) { *_ptrd = (T)0; _ptrd+=whd; }
      }
      return *this;
    }

    CImg<Tfloat> get_normalize() const {
      return CImg<Tfloat>(*this,false).normalize();
    }

    //! Compute L2-norm of each multi-valued pixel of the instance image.
    /**
       \param norm_type Type of computed vector norm (can be \p 0=Linf, \p 1=L1 or \p 2=L2).
       \return A reference to the modified instance image.
       \note
       - Function \p CImg<T>::get_norm() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"), res = img.get_norm();
       (img,res.normalize(0,255)).display();
       \endcode
       \image html ref_norm.jpg
    **/
    CImg<T>& norm(const int norm_type=2) {
      if (_spectrum==1) return abs();
      return get_norm(norm_type).move_to(*this);
    }

    CImg<Tfloat> get_norm(const int norm_type=2) const {
      if (is_empty()) return *this;
      if (_spectrum==1) return get_abs();
      const T *ptrs = _data;
      const unsigned int whd = _width*_height*_depth;
      CImg<Tfloat> res(_width,_height,_depth);
      Tfloat *ptrd = res._data;
      switch (norm_type) {
      case -1 : {             // Linf norm
        cimg_forXYZ(*this,x,y,z) {
          Tfloat n = 0;
          const T *_ptrs = ptrs++;
          cimg_forC(*this,c) { const Tfloat val = (Tfloat)cimg::abs(*_ptrs); if (val>n) n = val; _ptrs+=whd; }
          *(ptrd++) = n;
        }
      } break;
      case 1 : {              // L1 norm
        cimg_forXYZ(*this,x,y,z) {
          Tfloat n = 0;
          const T *_ptrs = ptrs++;
          cimg_forC(*this,c) { n+=cimg::abs(*_ptrs); _ptrs+=whd; }
          *(ptrd++) = n;
        }
      } break;
      default : {             // L2 norm
        cimg_forXYZ(*this,x,y,z) {
          Tfloat n = 0;
          const T *_ptrs = ptrs++;
          cimg_forC(*this,c) { n+=cimg::sqr((Tfloat)*_ptrs); _ptrs+=whd; }
          *(ptrd++) = (Tfloat)std::sqrt((Tfloat)n);
        }
      }
      }
      return res;
    }

    //! Cut values of the instance image between \p value_min and \p value_max.
    /**
       \param value_min Minimum desired value of the resulting image.
       \param value_max Maximum desired value of the resulting image.
       \return A reference to the modified instance image.
       \note
       - Function \p CImg<T>::get_cut() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"), res = img.get_cut(160,220);
       (img,res).display();
       \endcode
       \image html ref_cut.jpg
    **/
    CImg<T>& cut(const T value_min, const T value_max) {
      if (is_empty()) return *this;
      const T a = value_min<value_max?value_min:value_max, b = value_min<value_max?value_max:value_min;
      cimg_for(*this,ptrd,T) *ptrd = (*ptrd<a)?a:((*ptrd>b)?b:*ptrd);
      return *this;
    }

    CImg<T> get_cut(const T value_min, const T value_max) const {
      return (+*this).cut(value_min,value_max);
    }

    //! Uniformly quantize values of the instance image into \p nb_levels levels.
    /**
       \param nb_levels Number of quantization levels.
       \param keep_range Tells if resulting values keep the same range as the original ones.
       \return A reference to the modified instance image.
       \note
       - Function \p CImg<T>::get_quantize() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"), res = img.get_quantize(4);
       (img,res).display();
       \endcode
       \image html ref_quantize.jpg
    **/
    CImg<T>& quantize(const unsigned int nb_levels, const bool keep_range=true) {
      if (!nb_levels)
        throw CImgArgumentException(_cimg_instance
                                    "quantize() : Invalid quantization request with 0 values.",
                                    cimg_instance);

      if (is_empty()) return *this;
      Tfloat m, M = (Tfloat)max_min(m), range = M - m;
      if (range>0) {
        if (keep_range) cimg_for(*this,ptrd,T) {
          const unsigned int val = (unsigned int)((*ptrd-m)*nb_levels/range);
          *ptrd = (T)(m + cimg::min(val,nb_levels-1)*range/nb_levels);
        } else cimg_for(*this,ptrd,T) {
          const unsigned int val = (unsigned int)((*ptrd-m)*nb_levels/range);
          *ptrd = (T)cimg::min(val,nb_levels-1);
        }
      }
      return *this;
    }

    CImg<T> get_quantize(const unsigned int n, const bool keep_range=true) const {
      return (+*this).quantize(n,keep_range);
    }

    //! Threshold values of the instance image.
    /**
       \param value Threshold value
       \param soft_threshold Tells if soft thresholding must be applied (instead of hard one).
       \param strict_threshold Tells if threshold value is strict.
       \return A reference to the modified instance image. Resulting pixel values are either equal to 0 or 1.
       \note
       - Function \p CImg<T>::get_threshold() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"), res = img.get_threshold(128);
       (img,res.normalize(0,255)).display();
       \endcode
       \image html ref_threshold.jpg
    **/
    CImg<T>& threshold(const T value, const bool soft_threshold=false, const bool strict_threshold=false) {
      if (is_empty()) return *this;
      if (strict_threshold) {
        if (soft_threshold) cimg_for(*this,ptrd,T) { const T v = *ptrd; *ptrd = v>value?(T)(v-value):v<-(float)value?(T)(v+value):(T)0; }
        else cimg_for(*this,ptrd,T) *ptrd = *ptrd>value?(T)1:(T)0;
      } else {
        if (soft_threshold) cimg_for(*this,ptrd,T) { const T v = *ptrd; *ptrd = v>=value?(T)(v-value):v<=-(float)value?(T)(v+value):(T)0; }
        else cimg_for(*this,ptrd,T) *ptrd = *ptrd>=value?(T)1:(T)0;
      }
      return *this;
    }

    CImg<T> get_threshold(const T value, const bool soft_threshold=false, const bool strict_threshold=false) const {
      return (+*this).threshold(value,soft_threshold,strict_threshold);
    }

    //! Compute the histogram of the instance image.
    /**
       \param nb_levels Number of desired histogram levels.
       \param value_min Minimum pixel value considered for the histogram computation. All pixel values lower than \p value_min will not be counted.
       \param value_max Maximum pixel value considered for the histogram computation. All pixel values higher than \p value_max will not be counted.
       \return Instance image is replaced by its histogram, defined as a \p CImg<T>(nb_levels) image.
       \note
       - The histogram H of an image I is the 1d function where H(x) counts the number of occurences of the value x in the image I.
       - If \p value_min==value_max==0 (default behavior), the function first estimates the whole range of pixel values
       then uses it to compute the histogram.
       - The resulting histogram is always defined in 1d. Histograms of multi-valued images are not multi-dimensional.
       - Function \p CImg<T>::get_histogram() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img = CImg<float>("reference.jpg").histogram(256);
       img.display_graph(0,3);
       \endcode
       \image html ref_histogram.jpg
    **/
    CImg<T>& histogram(const unsigned int nb_levels, const T value_min=(T)0, const T value_max=(T)0) {
      return get_histogram(nb_levels,value_min,value_max).move_to(*this);
    }

    CImg<floatT> get_histogram(const unsigned int nb_levels, const T value_min=(T)0, const T value_max=(T)0) const {
      if (!nb_levels)
        throw CImgArgumentException(_cimg_instance
                                    "histogram() : Invalid histogram request with 0 levels.",
                                    cimg_instance);

      if (is_empty()) return CImg<floatT>();
      T vmin = value_min, vmax = value_max;
      CImg<floatT> res(nb_levels,1,1,1,0);
      if (vmin>=vmax && vmin==0) vmin = min_max(vmax);
      if (vmin<vmax) cimg_for(*this,ptrs,T) {
        const T val = *ptrs;
        if (val>=vmin && val<=vmax) ++res[val==vmax?nb_levels-1:(int)((val-vmin)*nb_levels/(vmax-vmin))];
      } else res[0]+=size();
      return res;
    }

    //! Compute the histogram-equalized version of the instance image.
    /**
       \param nb_levels Number of histogram levels used for the equalization.
       \param value_min Minimum pixel value considered for the histogram computation. All pixel values lower than \p value_min will not be counted.
       \param value_max Maximum pixel value considered for the histogram computation. All pixel values higher than \p value_max will not be counted.
       \return A reference to the modified instance image.
       \note
       - If \p value_min==value_max==0 (default behavior), the function first estimates the whole range of pixel values
       then uses it to equalize the histogram.
       - Function \p CImg<T>::get_equalize() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"), res = img.get_equalize(256);
       (img,res).display();
       \endcode
       \image html ref_equalize.jpg
    **/
    CImg<T>& equalize(const unsigned int nb_levels, const T value_min=(T)0, const T value_max=(T)0) {
      if (is_empty()) return *this;
      T vmin = value_min, vmax = value_max;
      if (vmin==vmax && vmin==0) vmin = min_max(vmax);
      if (vmin<vmax) {
        CImg<floatT> hist = get_histogram(nb_levels,vmin,vmax);
        float cumul = 0;
        cimg_forX(hist,pos) { cumul+=hist[pos]; hist[pos] = cumul; }
        cimg_for(*this,ptrd,T) {
          const int pos = (unsigned int)((*ptrd-vmin)*(nb_levels-1)/(vmax-vmin));
          if (pos>=0 && pos<(int)nb_levels) *ptrd = (T)(vmin + (vmax-vmin)*hist[pos]/size());
        }
      }
      return *this;
    }

    CImg<T> get_equalize(const unsigned int nblevels, const T val_min=(T)0, const T val_max=(T)0) const {
      return (+*this).equalize(nblevels,val_min,val_max);
    }

    //! Index multi-valued pixels of the instance image, regarding to a predefined palette.
    /**
       \param palette Multi-valued palette used as the basis for multi-valued pixel indexing.
       \param dithering Tells if Floyd-Steinberg dithering is activated or not.
       \param map_indexes Tell if the values of the resulting image are the palette indices or the palette vectors.
       \return A reference to the modified instance image.
       \note
       - \p img.index(palette,dithering,1) is equivalent to <tt>img.index(palette,dithering,0).map(palette)</tt>.
       - Function \p CImg<T>::get_index() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"), palette(3,1,1,3, 0,128,255, 0,128,255, 0,128,255);
       const CImg<float> res = img.get_index(palette,true,true);
       (img,res).display();
       \endcode
       \image html ref_index.jpg
    **/
    template<typename t>
    CImg<T>& index(const CImg<t>& palette, const bool dithering=false, const bool map_indexes=false) {
      return get_index(palette,dithering,map_indexes).move_to(*this);
    }

    template<typename t>
    CImg<typename CImg<t>::Tuint>
    get_index(const CImg<t>& palette, const bool dithering=false, const bool map_indexes=true) const {
      if (palette._spectrum!=_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "index() : Instance and specified palette (%u,%u,%u,%u,%p) "
                                    "have incompatible dimensions.",
                                    cimg_instance,
                                    palette._width,palette._height,palette._depth,palette._spectrum,palette._data);

      typedef typename CImg<t>::Tuint tuint;
      if (is_empty()) return CImg<tuint>();
      const unsigned int whd = _width*_height*_depth, pwhd = palette._width*palette._height*palette._depth;
      CImg<tuint> res(_width,_height,_depth,map_indexes?_spectrum:1);
      tuint *ptrd = res._data;
      if (dithering) { // Dithered versions.
        Tfloat valm = 0, valM = (Tfloat)max_min(valm);
        if (valm==valM && valm>=0 && valM<=255) { valm = 0; valM = 255; }
        CImg<Tfloat> cache = get_crop(-1,0,0,0,_width,1,0,_spectrum-1);
        Tfloat *cache_current = cache.data(1,0,0,0), *cache_next = cache.data(1,1,0,0);
        const unsigned int cwhd = cache._width*cache._height*cache._depth;
        switch (_spectrum) {
        case 1 : { // Optimized for scalars.
          cimg_forYZ(*this,y,z) {
            if (y<height()-2) {
              Tfloat *ptrc0 = cache_next; const T *ptrs0 = data(0,y+1,z,0);
              cimg_forX(*this,x) *(ptrc0++) = (Tfloat)*(ptrs0++);
            }
            Tfloat *ptrs0 = cache_current, *ptrsn0 = cache_next;
            cimg_forX(*this,x) {
              const Tfloat _val0 = (Tfloat)*ptrs0, val0 = _val0<valm?valm:_val0>valM?valM:_val0;
              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = palette._data;
              for (const t *ptrp0 = palette._data, *ptrp_end = ptrp0 + pwhd; ptrp0<ptrp_end; ) {
                const Tfloat pval0 = (Tfloat)*(ptrp0++) - val0, dist = pval0*pval0;
                if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
              }
              const Tfloat err0 = ((*(ptrs0++)=val0) - (Tfloat)*ptrmin0)/16;
              *ptrs0+=7*err0; *(ptrsn0-1)+=3*err0; *(ptrsn0++)+=5*err0; *ptrsn0+=err0;
              if (map_indexes) *(ptrd++) = (tuint)*ptrmin0; else *(ptrd++) = (tuint)(ptrmin0 - palette._data);
            }
            cimg::swap(cache_current,cache_next);
          }
        } break;
        case 2 : { // Optimized for 2d vectors.
          tuint *ptrd1 = ptrd + whd;
          cimg_forYZ(*this,y,z) {
            if (y<height()-2) {
              Tfloat *ptrc0 = cache_next, *ptrc1 = ptrc0 + cwhd;
              const T *ptrs0 = data(0,y+1,z,0), *ptrs1 = ptrs0 + whd;
              cimg_forX(*this,x) { *(ptrc0++) = (Tfloat)*(ptrs0++); *(ptrc1++) = (Tfloat)*(ptrs1++); }
            }
            Tfloat
              *ptrs0 = cache_current, *ptrs1 = ptrs0 + cwhd,
              *ptrsn0 = cache_next, *ptrsn1 = ptrsn0 + cwhd;
            cimg_forX(*this,x) {
              const Tfloat
                _val0 = (Tfloat)*ptrs0, val0 = _val0<valm?valm:_val0>valM?valM:_val0,
                _val1 = (Tfloat)*ptrs1, val1 = _val1<valm?valm:_val1>valM?valM:_val1;
              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = palette._data;
              for (const t *ptrp0 = palette._data, *ptrp1 = ptrp0 + pwhd, *ptrp_end = ptrp1; ptrp0<ptrp_end; ) {
                const Tfloat
                  pval0 = (Tfloat)*(ptrp0++) - val0, pval1 = (Tfloat)*(ptrp1++) - val1,
                  dist = pval0*pval0 + pval1*pval1;
                if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
              }
              const t *const ptrmin1 = ptrmin0 + pwhd;
              const Tfloat
                err0 = ((*(ptrs0++)=val0) - (Tfloat)*ptrmin0)/16,
                err1 = ((*(ptrs1++)=val1) - (Tfloat)*ptrmin1)/16;
              *ptrs0+=7*err0; *ptrs1+=7*err1;
              *(ptrsn0-1)+=3*err0; *(ptrsn1-1)+=3*err1;
              *(ptrsn0++)+=5*err0; *(ptrsn1++)+=5*err1;
              *ptrsn0+=err0; *ptrsn1+=err1;
              if (map_indexes) { *(ptrd++) = (tuint)*ptrmin0; *(ptrd1++) = (tuint)*ptrmin1; }
              else *(ptrd++) = (tuint)(ptrmin0 - palette._data);
            }
            cimg::swap(cache_current,cache_next);
          }
        } break;
        case 3 : { // Optimized for 3d vectors (colors).
          tuint *ptrd1 = ptrd + whd, *ptrd2 = ptrd1 + whd;
          cimg_forYZ(*this,y,z) {
            if (y<height()-2) {
              Tfloat *ptrc0 = cache_next, *ptrc1 = ptrc0 + cwhd, *ptrc2 = ptrc1 + cwhd;
              const T *ptrs0 = data(0,y+1,z,0), *ptrs1 = ptrs0 + whd, *ptrs2 = ptrs1 + whd;
              cimg_forX(*this,x) { *(ptrc0++) = (Tfloat)*(ptrs0++); *(ptrc1++) = (Tfloat)*(ptrs1++); *(ptrc2++) = (Tfloat)*(ptrs2++); }
            }
            Tfloat
              *ptrs0 = cache_current, *ptrs1 = ptrs0 + cwhd, *ptrs2 = ptrs1 + cwhd,
              *ptrsn0 = cache_next, *ptrsn1 = ptrsn0 + cwhd, *ptrsn2 = ptrsn1 + cwhd;
            cimg_forX(*this,x) {
              const Tfloat
                _val0 = (Tfloat)*ptrs0, val0 = _val0<valm?valm:_val0>valM?valM:_val0,
                _val1 = (Tfloat)*ptrs1, val1 = _val1<valm?valm:_val1>valM?valM:_val1,
                _val2 = (Tfloat)*ptrs2, val2 = _val2<valm?valm:_val2>valM?valM:_val2;
              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = palette._data;
              for (const t *ptrp0 = palette._data, *ptrp1 = ptrp0 + pwhd, *ptrp2 = ptrp1 + pwhd, *ptrp_end = ptrp1; ptrp0<ptrp_end; ) {
                const Tfloat
                  pval0 = (Tfloat)*(ptrp0++) - val0, pval1 = (Tfloat)*(ptrp1++) - val1, pval2 = (Tfloat)*(ptrp2++) - val2,
                  dist = pval0*pval0 + pval1*pval1 + pval2*pval2;
                if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
              }
              const t *const ptrmin1 = ptrmin0 + pwhd, *const ptrmin2 = ptrmin1 + pwhd;
              const Tfloat
                err0 = ((*(ptrs0++)=val0) - (Tfloat)*ptrmin0)/16,
                err1 = ((*(ptrs1++)=val1) - (Tfloat)*ptrmin1)/16,
                err2 = ((*(ptrs2++)=val2) - (Tfloat)*ptrmin2)/16;
              *ptrs0+=7*err0; *ptrs1+=7*err1; *ptrs2+=7*err2;
              *(ptrsn0-1)+=3*err0; *(ptrsn1-1)+=3*err1; *(ptrsn2-1)+=3*err2;
              *(ptrsn0++)+=5*err0; *(ptrsn1++)+=5*err1; *(ptrsn2++)+=5*err2;
              *ptrsn0+=err0; *ptrsn1+=err1; *ptrsn2+=err2;
              if (map_indexes) { *(ptrd++) = (tuint)*ptrmin0; *(ptrd1++) = (tuint)*ptrmin1; *(ptrd2++) = (tuint)*ptrmin2; }
              else *(ptrd++) = (tuint)(ptrmin0 - palette._data);
            }
            cimg::swap(cache_current,cache_next);
          }
        } break;
        default : // Generic version
          cimg_forYZ(*this,y,z) {
            if (y<height()-2) {
              Tfloat *ptrc = cache_next;
              cimg_forC(*this,c) {
                Tfloat *_ptrc = ptrc; const T *_ptrs = data(0,y+1,z,c);
                cimg_forX(*this,x) *(_ptrc++) = (Tfloat)*(_ptrs++);
                ptrc+=cwhd;
              }
            }
            Tfloat *ptrs = cache_current, *ptrsn = cache_next;
            cimg_forX(*this,x) {
              Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin = palette._data;
              for (const t *ptrp = palette._data, *ptrp_end = ptrp + pwhd; ptrp<ptrp_end; ++ptrp) {
                Tfloat dist = 0; Tfloat *_ptrs = ptrs; const t *_ptrp = ptrp;
                cimg_forC(*this,c) {
                  const Tfloat _val = *_ptrs, val = _val<valm?valm:_val>valM?valM:_val;
                  dist+=cimg::sqr((*_ptrs=val) - (Tfloat)*_ptrp); _ptrs+=cwhd; _ptrp+=pwhd;
                }
                if (dist<distmin) { ptrmin = ptrp; distmin = dist; }
              }
              const t *_ptrmin = ptrmin; Tfloat *_ptrs = ptrs++, *_ptrsn = (ptrsn++)-1;
              cimg_forC(*this,c) {
                const Tfloat err = (*(_ptrs++) - (Tfloat)*_ptrmin)/16;
                *_ptrs+=7*err; *(_ptrsn++)+=3*err; *(_ptrsn++)+=5*err; *_ptrsn+=err;
                _ptrmin+=pwhd; _ptrs+=cwhd-1; _ptrsn+=cwhd-2;
              }
              if (map_indexes) {
                tuint *_ptrd = ptrd++;
                cimg_forC(*this,c) { *_ptrd = (tuint)*ptrmin; _ptrd+=whd; ptrmin+=pwhd; }
              }
              else *(ptrd++) = (tuint)(ptrmin - palette._data);
            }
            cimg::swap(cache_current,cache_next);
          }
        }
      } else { // Non-dithered versions
        switch (_spectrum) {
        case 1 : { // Optimized for scalars.
          for (const T *ptrs0 = _data, *ptrs_end = ptrs0 + whd; ptrs0<ptrs_end; ) {
            const Tfloat val0 = (Tfloat)*(ptrs0++);
            Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = palette._data;
            for (const t *ptrp0 = palette._data, *ptrp_end = ptrp0 + pwhd; ptrp0<ptrp_end; ) {
              const Tfloat pval0 = (Tfloat)*(ptrp0++) - val0, dist = pval0*pval0;
              if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
            }
            if (map_indexes) *(ptrd++) = (tuint)*ptrmin0; else *(ptrd++) = (tuint)(ptrmin0 - palette._data);
          }
        } break;
        case 2 : { // Optimized for 2d vectors.
          tuint *ptrd1 = ptrd + whd;
          for (const T *ptrs0 = _data, *ptrs1 = ptrs0 + whd, *ptrs_end = ptrs1; ptrs0<ptrs_end; ) {
            const Tfloat val0 = (Tfloat)*(ptrs0++), val1 = (Tfloat)*(ptrs1++);
            Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = palette._data;
            for (const t *ptrp0 = palette._data, *ptrp1 = ptrp0 + pwhd, *ptrp_end = ptrp1; ptrp0<ptrp_end; ) {
              const Tfloat
                pval0 = (Tfloat)*(ptrp0++) - val0, pval1 = (Tfloat)*(ptrp1++) - val1,
                dist = pval0*pval0 + pval1*pval1;
              if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
            }
            if (map_indexes) { *(ptrd++) = (tuint)*ptrmin0; *(ptrd1++) = (tuint)*(ptrmin0 + pwhd); }
            else *(ptrd++) = (tuint)(ptrmin0 - palette._data);
          }
        } break;
        case 3 : { // Optimized for 3d vectors (colors).
          tuint *ptrd1 = ptrd + whd, *ptrd2 = ptrd1 + whd;
          for (const T *ptrs0 = _data, *ptrs1 = ptrs0 + whd, *ptrs2 = ptrs1 + whd, *ptrs_end = ptrs1; ptrs0<ptrs_end; ) {
            const Tfloat val0 = (Tfloat)*(ptrs0++), val1 = (Tfloat)*(ptrs1++), val2 = (Tfloat)*(ptrs2++);
            Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin0 = palette._data;
            for (const t *ptrp0 = palette._data, *ptrp1 = ptrp0 + pwhd, *ptrp2 = ptrp1 + pwhd, *ptrp_end = ptrp1; ptrp0<ptrp_end; ) {
              const Tfloat
                pval0 = (Tfloat)*(ptrp0++) - val0, pval1 = (Tfloat)*(ptrp1++) - val1, pval2 = (Tfloat)*(ptrp2++) - val2,
                dist = pval0*pval0 + pval1*pval1 + pval2*pval2;
              if (dist<distmin) { ptrmin0 = ptrp0 - 1; distmin = dist; }
            }
            if (map_indexes) { *(ptrd++) = (tuint)*ptrmin0; *(ptrd1++) = (tuint)*(ptrmin0 + pwhd); *(ptrd2++) = (tuint)*(ptrmin0 + 2*pwhd); }
            else *(ptrd++) = (tuint)(ptrmin0 - palette._data);
          }
        } break;
        default : // Generic version.
          for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ++ptrs) {
            Tfloat distmin = cimg::type<Tfloat>::max(); const t *ptrmin = palette._data;
            for (const t *ptrp = palette._data, *ptrp_end = ptrp + pwhd; ptrp<ptrp_end; ++ptrp) {
              Tfloat dist = 0; const T *_ptrs = ptrs; const t *_ptrp = ptrp;
              cimg_forC(*this,c) { dist+=cimg::sqr((Tfloat)*_ptrs - (Tfloat)*_ptrp); _ptrs+=whd; _ptrp+=pwhd; }
              if (dist<distmin) { ptrmin = ptrp; distmin = dist; }
            }
            if (map_indexes) {
              tuint *_ptrd = ptrd++;
              cimg_forC(*this,c) { *_ptrd = (tuint)*ptrmin; _ptrd+=whd; ptrmin+=pwhd; }
            }
            else *(ptrd++) = (tuint)(ptrmin - palette._data);
          }
        }
      }
      return res;
    }

    //! Map predefined palette on the scalar (indexed) instance image.
    /**
       \param palette Multi-valued palette used for mapping the indexes.
       \return A reference to the modified instance image.
       \note
       - Function \p CImg<T>::get_map() is also defined. It returns a non-shared modified copy of the instance image.
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg"),
                         palette1(3,1,1,3, 0,128,255, 0,128,255, 0,128,255),
                         palette2(3,1,1,3, 255,0,0, 0,255,0, 0,0,255),
                         res = img.get_index(palette1,false).map(palette2);
       (img,res).display();
       \endcode
       \image html ref_map.jpg
    **/
    template<typename t>
    CImg<T>& map(const CImg<t>& palette) {
      return get_map(palette).move_to(*this);
    }

    template<typename t>
    CImg<t> get_map(const CImg<t>& palette) const {
      if (_spectrum!=1 && palette._spectrum!=1)
        throw CImgArgumentException(_cimg_instance
                                    "map() : Instance and specified palette (%u,%u,%u,%u,%p) "
                                    "have incompatible dimensions.",
                                    cimg_instance,
                                    palette._width,palette._height,palette._depth,palette._spectrum,palette._data);

      const unsigned int whd = _width*_height*_depth, pwhd = palette._width*palette._height*palette._depth;
      CImg<t> res(_width,_height,_depth,palette._spectrum==1?_spectrum:palette._spectrum);
      switch (palette._spectrum) {
      case 1 : { // Optimized for scalars.
        const T *ptrs = _data + whd*_spectrum;
        cimg_for(res,ptrd,t) {
          const unsigned int _ind = (unsigned int)*(--ptrs), ind = _ind<pwhd?_ind:0;
          *ptrd = palette[ind];
        }
      } break;
      case 2 : { // Optimized for 2d vectors.
        const t *const ptrp0 = palette._data, *ptrp1 = ptrp0 + pwhd;
        t *ptrd0 = res._data, *ptrd1 = ptrd0 + whd;
        for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
          const unsigned int _ind = (unsigned int)*(ptrs++), ind = _ind<pwhd?_ind:0;
          *(ptrd0++) = ptrp0[ind]; *(ptrd1++) = ptrp1[ind];
        }
      } break;
      case 3 : { // Optimized for 3d vectors (colors).
        const t *const ptrp0 = palette._data, *ptrp1 = ptrp0 + pwhd, *ptrp2 = ptrp1 + pwhd;
        t *ptrd0 = res._data, *ptrd1 = ptrd0 + whd, *ptrd2 = ptrd1 + whd;
        for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
          const unsigned int _ind = (unsigned int)*(ptrs++), ind = _ind<pwhd?_ind:0;
          *(ptrd0++) = ptrp0[ind]; *(ptrd1++) = ptrp1[ind]; *(ptrd2++) = ptrp2[ind];
        }
      } break;
      default : { // Generic version.
        t *ptrd = res._data;
        for (const T *ptrs = _data, *ptrs_end = ptrs + whd; ptrs<ptrs_end; ) {
          const unsigned int _ind = (unsigned int)*(ptrs++), ind = _ind<pwhd?_ind:0;
          const t *ptrp = palette._data + ind;
          t *_ptrd = ptrd++; cimg_forC(res,c) { *_ptrd = *ptrp; _ptrd+=whd; ptrp+=pwhd; }
        }
      }
      }
      return res;
    }

    //! Label connected components.
    /**
       \param is_high_connectivity Boolean that choose between 4(false)- or 8(true)-connectivity
                                   in 2d case, and between 6(false)- or 26(true)-connectivity in 3d case.
        \note The algorithm of connected components computation has been primarily done
              by A. Meijster, according to the publication :
             'W.H. Hesselink, A. Meijster, C. Bron, "Concurrent Determination of Connected Components.",
             In: Science of Computer Programming 41 (2001), pp. 173--194'.
             The submitted code has then been modified to fit CImg coding style and constraints.
    **/
    CImg<T>& label(const bool is_high_connectivity=false, const Tfloat tolerance=0) {
      return get_label(is_high_connectivity,tolerance).move_to(*this);
    }

    CImg<unsigned long> get_label(const bool is_high_connectivity=false, const Tfloat tolerance=0) const {
      if (is_empty()) return CImg<unsigned long>();

      // Create neighborhood tables.
      int dx[26], dy[26], dz[26], nb = 0;
      if (_depth>1) { // 3d version.
        for (unsigned int _dx = 0; _dx<=1; ++_dx)
          for (unsigned int _dy = 0; _dy<=1; ++_dy)
            for (unsigned int _dz = 0; _dz<=1; ++_dz)
              if (_dx+_dy+_dz && (is_high_connectivity || _dx+_dy+_dz==1)) { dx[nb] = (int)_dx; dy[nb] = (int)_dy; dz[nb] = (int)_dz; ++nb; }
      } else { // 2d version.
        for (unsigned int _dx = 0; _dx<=1; ++_dx)
          for (unsigned int _dy = 0; _dy<=1; ++_dy)
            if (_dx+_dy && (is_high_connectivity || _dx+_dy==1)) { dx[nb] = (int)_dx; dy[nb] = (int)_dy; dz[nb] = 0; ++nb; }
      }
      return _get_label(nb,dx,dy,dz,tolerance);
    }

    template<typename t>
    CImg<T>& label(const CImg<t>& connectivity_mask, const Tfloat tolerance=0) {
      return get_label(connectivity_mask,tolerance).move_to(*this);
    }

    template<typename t>
    CImg<unsigned long> get_label(const CImg<t>& connectivity_mask, const Tfloat tolerance=0) const {
      int nb = 0;
      cimg_for(connectivity_mask,ptr,t) if (*ptr) ++nb;
      CImg<intT> dx(nb,1,1,1,0), dy(nb,1,1,1,0), dz(nb,1,1,1,0);
      nb = 0;
      cimg_forXYZ(connectivity_mask,x,y,z) if ((x || y || z) && connectivity_mask(x,y,z)) {
        dx[nb] = x; dy[nb] = y; dz[nb++] = z;
      }
      return _get_label(nb,dx,dy,dz,tolerance);
    }

    // Generic version, allows any kind of neighbor connectivity. Use it at your own risk :)
    CImg<unsigned long> _get_label(const unsigned int nb, const int *const dx, const int *const dy, const int *const dz,
                                   const Tfloat tolerance) const {
      CImg<unsigned long> res(_width,_height,_depth,_spectrum);
      cimg_forC(*this,c) {
        CImg<unsigned long> _res = res.get_shared_channel(c);

        // Init label numbers.
        unsigned long *ptr = _res.data();
        cimg_foroff(_res,p) *(ptr++) = p;

        // For each neighbour-direction, label.
        for (unsigned int n = 0; n<nb; ++n) {
          const int _dx = dx[n], _dy = dy[n], _dz = dz[n];
          if (_dx || _dy || _dz) {
            const unsigned int
              x0 = _dx<0?-_dx:0,
              x1 = _dx<0?_width:_width - _dx,
              y0 = _dy<0?-_dy:0,
              y1 = _dy<0?_height:_height - _dy,
              z0 = _dz<0?-_dz:0,
              z1 = _dz<0?_depth:_depth - _dz,
              wh = _width*_height;
            const unsigned long offset = _dz*wh + _dy*_width + _dx;
            for (unsigned long z = z0, nz = z0 + _dz, pz = z0*wh; z<z1; ++z, ++nz, pz+=wh) {
              for (unsigned long y = y0, ny = y0 + _dy, py = y0*_width + pz; y<y1; ++y, ++ny, py+=_width) {
                for (unsigned long x = x0, nx = x0 + _dx, p = x0 + py; x<x1; ++x, ++nx, ++p) {
                  if ((Tfloat)cimg::abs((*this)(x,y,z,0,wh)-(*this)(nx,ny,nz,0,wh))<=tolerance) {
                    const unsigned long q = p + offset;
                    unsigned long x, y;
                    for (x = p<q?q:p, y = p<q?p:q; x!=y && _res[x]!=x; ) { x = _res[x]; if (x<y) cimg::swap(x,y); }
                    if (x!=y) _res[x] = y;
                    for (unsigned long _p = p; _p!=y; ) { const unsigned long h = _res[_p]; _res[_p] = y; _p = h; }
                    for (unsigned long _q = q; _q!=y; ) { const unsigned long h = _res[_q]; _res[_q] = y; _q = h; }
                  }
                }
              }
            }
          }
        }

        // Remove equivalences.
        unsigned long counter = 0;
        ptr = _res.data();
        cimg_foroff(_res,p) { *ptr = *ptr==p?counter++:_res[*ptr]; ++ptr; }
      }
      return res;
    }

    //@}
    //---------------------------------
    //
    //! \name Color Base Management
    //@{
    //---------------------------------

    //! Return a palette 'default' with 256 (R,G,B) entries.
    static const CImg<Tuchar>& default_LUT256() {
      static CImg<Tuchar> palette;
      if (!palette) {
        palette.assign(1,256,1,3);
        for (unsigned int index = 0, r = 16; r<256; r+=32)
          for (unsigned int g = 16; g<256; g+=32)
            for (unsigned int b = 32; b<256; b+=64) {
              palette(0,index,0) = (Tuchar)r;
              palette(0,index,1) = (Tuchar)g;
              palette(0,index++,2) = (Tuchar)b;
            }
      }
      return palette;
    }

    //! Return palette 'HSV' with 256 (R,G,B) entries.
    static const CImg<Tuchar>& HSV_LUT256() {
      static CImg<Tuchar> palette;
      if (!palette) {
        CImg<Tint> tmp(1,256,1,3,1);
        tmp.get_shared_channel(0).sequence(0,359);
        palette = tmp.HSVtoRGB();
      }
      return palette;
    }

    //! Return palette 'lines' with 256 (R,G,B) entries.
    static const CImg<Tuchar>& lines_LUT256() {
      static const unsigned char pal[] = {
        217,62,88,75,1,237,240,12,56,160,165,116,1,1,204,2,15,248,148,185,133,141,46,246,222,116,16,5,207,226,
        17,114,247,1,214,53,238,0,95,55,233,235,109,0,17,54,33,0,90,30,3,0,94,27,19,0,68,212,166,130,0,15,7,119,
        238,2,246,198,0,3,16,10,13,2,25,28,12,6,2,99,18,141,30,4,3,140,12,4,30,233,7,10,0,136,35,160,168,184,20,
        233,0,1,242,83,90,56,180,44,41,0,6,19,207,5,31,214,4,35,153,180,75,21,76,16,202,218,22,17,2,136,71,74,
        81,251,244,148,222,17,0,234,24,0,200,16,239,15,225,102,230,186,58,230,110,12,0,7,129,249,22,241,37,219,
        1,3,254,210,3,212,113,131,197,162,123,252,90,96,209,60,0,17,0,180,249,12,112,165,43,27,229,77,40,195,12,
        87,1,210,148,47,80,5,9,1,137,2,40,57,205,244,40,8,252,98,0,40,43,206,31,187,0,180,1,69,70,227,131,108,0,
        223,94,228,35,248,243,4,16,0,34,24,2,9,35,73,91,12,199,51,1,249,12,103,131,20,224,2,70,32,
        233,1,165,3,8,154,246,233,196,5,0,6,183,227,247,195,208,36,0,0,226,160,210,198,69,153,210,1,23,8,192,2,4,
        137,1,0,52,2,249,241,129,0,0,234,7,238,71,7,32,15,157,157,252,158,2,250,6,13,30,11,162,0,199,21,11,27,224,
        4,157,20,181,111,187,218,3,0,11,158,230,196,34,223,22,248,135,254,210,157,219,0,117,239,3,255,4,227,5,247,
        11,4,3,188,111,11,105,195,2,0,14,1,21,219,192,0,183,191,113,241,1,12,17,248,0,48,7,19,1,254,212,0,239,246,
        0,23,0,250,165,194,194,17,3,253,0,24,6,0,141,167,221,24,212,2,235,243,0,0,205,1,251,133,204,28,4,6,1,10,
        141,21,74,12,236,254,228,19,1,0,214,1,186,13,13,6,13,16,27,209,6,216,11,207,251,59,32,9,155,23,19,235,143,
        116,6,213,6,75,159,23,6,0,228,4,10,245,249,1,7,44,234,4,102,174,0,19,239,103,16,15,18,8,214,22,4,47,244,
        255,8,0,251,173,1,212,252,250,251,252,6,0,29,29,222,233,246,5,149,0,182,180,13,151,0,203,183,0,35,149,0,
        235,246,254,78,9,17,203,73,11,195,0,3,5,44,0,0,237,5,106,6,130,16,214,20,168,247,168,4,207,11,5,1,232,251,
        129,210,116,231,217,223,214,27,45,38,4,177,186,249,7,215,172,16,214,27,249,230,236,2,34,216,217,0,175,30,
        243,225,244,182,20,212,2,226,21,255,20,0,2,13,62,13,191,14,76,64,20,121,4,118,0,216,1,147,0,2,210,1,215,
        95,210,236,225,184,46,0,248,24,11,1,9,141,250,243,9,221,233,160,11,147,2,55,8,23,12,253,9,0,54,0,231,6,3,
        141,8,2,246,9,180,5,11,8,227,8,43,110,242,1,130,5,97,36,10,6,219,86,133,11,108,6,1,5,244,67,19,28,0,174,
        154,16,127,149,252,188,196,196,228,244,9,249,0,0,0,37,170,32,250,0,73,255,23,3,224,234,38,195,198,0,255,87,
        33,221,174,31,3,0,189,228,6,153,14,144,14,108,197,0,9,206,245,254,3,16,253,178,248,0,95,125,8,0,3,168,21,
        23,168,19,50,240,244,185,0,1,144,10,168,31,82,1,13 };
      static const CImg<Tuchar> palette(pal,1,256,1,3,false);
      return palette;
    }

    //! Return the palette 'hot' with 256 (R,G,B) entries.
    static const CImg<Tuchar>& hot_LUT256() {
      static CImg<Tuchar> palette;
      if (!palette) {
        palette.assign(1,4,1,3,0);
        palette[1] = palette[2] = palette[3] = palette[6] = palette[7] = palette[11] = 255;
        palette.resize(1,256,1,3,3);
      }
      return palette;
    }

    //! Return the palette 'cool' with 256 (R,G,B) entries.
    static const CImg<Tuchar>& cool_LUT256() {
      static CImg<Tuchar> palette;
      if (!palette) palette.assign(1,2,1,3).fill(0,255,255,0,255,255).resize(1,256,1,3,3);
      return palette;
    }

    //! Return palette 'jet' with 256 (R,G,B) entries.
    static const CImg<Tuchar>& jet_LUT256() {
      static CImg<Tuchar> palette;
      if (!palette) {
        palette.assign(1,4,1,3,0);
        palette[2] = palette[3] = palette[5] = palette[6] = palette[8] = palette[9] = 255;
        palette.resize(1,256,1,3,3);
      }
      return palette;
    }

    //! Return palette 'flag' with 256 (R,G,B) entries.
    static const CImg<Tuchar>& flag_LUT256() {
      static CImg<Tuchar> palette;
      if (!palette) {
        palette.assign(1,4,1,3,0);
        palette[0] = palette[1] = palette[5] = palette[9] = palette[10] = 255;
        palette.resize(1,256,1,3,0,2);
      }
      return palette;
    }

    //! Return palette 'cube' with 256 (R,G,B) entries.
    static const CImg<Tuchar>& cube_LUT256() {
      static CImg<Tuchar> palette;
      if (!palette) {
        palette.assign(1,8,1,3,0);
        palette[1] = palette[3] = palette[5] = palette[7] =
          palette[10] = palette[11] = palette[12] = palette[13] =
          palette[20] = palette[21] = palette[22] = palette[23] = 255;
        palette.resize(1,256,1,3,3);
      }
      return palette;
    }

    //! Convert color pixels from (R,G,B) to (H,S,V).
    CImg<T>& RGBtoHSV() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "RGBtoHSV() : Instance is not a RGB image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          R = (Tfloat)*p1,
          G = (Tfloat)*p2,
          B = (Tfloat)*p3,
          nR = (R<0?0:(R>255?255:R))/255,
          nG = (G<0?0:(G>255?255:G))/255,
          nB = (B<0?0:(B>255?255:B))/255,
          m = cimg::min(nR,nG,nB),
          M = cimg::max(nR,nG,nB);
        Tfloat H = 0, S = 0;
        if (M!=m) {
          const Tfloat
            f = (nR==m)?(nG-nB):((nG==m)?(nB-nR):(nR-nG)),
            i = (Tfloat)((nR==m)?3:((nG==m)?5:1));
          H = (i-f/(M-m));
          if (H>=6) H-=6;
          H*=60;
          S = (M-m)/M;
        }
        *(p1++) = (T)H;
        *(p2++) = (T)S;
        *(p3++) = (T)M;
      }
      return *this;
    }

    CImg<Tfloat> get_RGBtoHSV() const {
      return CImg<Tfloat>(*this,false).RGBtoHSV();
    }

    //! Convert color pixels from (H,S,V) to (R,G,B).
    CImg<T>& HSVtoRGB() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "HSVtoRGB() : Instance is not a HSV image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        Tfloat
          H = (Tfloat)*p1,
          S = (Tfloat)*p2,
          V = (Tfloat)*p3,
          R = 0, G = 0, B = 0;
        if (H==0 && S==0) R = G = B = V;
        else {
          H/=60;
          const int i = (int)std::floor(H);
          const Tfloat
            f = (i&1)?(H - i):(1 - H + i),
            m = V*(1 - S),
            n = V*(1 - S*f);
          switch (i) {
          case 6 :
          case 0 : R = V; G = n; B = m; break;
          case 1 : R = n; G = V; B = m; break;
          case 2 : R = m; G = V; B = n; break;
          case 3 : R = m; G = n; B = V; break;
          case 4 : R = n; G = m; B = V; break;
          case 5 : R = V; G = m; B = n; break;
          }
        }
        R*=255; G*=255; B*=255;
        *(p1++) = (T)(R<0?0:(R>255?255:R));
        *(p2++) = (T)(G<0?0:(G>255?255:G));
        *(p3++) = (T)(B<0?0:(B>255?255:B));
      }
      return *this;
    }

    CImg<Tuchar> get_HSVtoRGB() const {
      return CImg<Tuchar>(*this,false).HSVtoRGB();
    }

    //! Convert color pixels from (R,G,B) to (H,S,L).
    CImg<T>& RGBtoHSL() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "RGBtoHSL() : Instance is not a RGB image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          R = (Tfloat)*p1,
          G = (Tfloat)*p2,
          B = (Tfloat)*p3,
          nR = (R<0?0:(R>255?255:R))/255,
          nG = (G<0?0:(G>255?255:G))/255,
          nB = (B<0?0:(B>255?255:B))/255,
          m = cimg::min(nR,nG,nB),
          M = cimg::max(nR,nG,nB),
          L = (m + M)/2;
        Tfloat H = 0, S = 0;
        if (M==m) H = S = 0;
        else {
          const Tfloat
            f = (nR==m)?(nG-nB):((nG==m)?(nB-nR):(nR-nG)),
            i = (nR==m)?3.0f:((nG==m)?5.0f:1.0f);
          H = (i-f/(M-m));
          if (H>=6) H-=6;
          H*=60;
          S = (2*L<=1)?((M-m)/(M+m)):((M-m)/(2-M-m));
        }
        *(p1++) = (T)H;
        *(p2++) = (T)S;
        *(p3++) = (T)L;
      }
      return *this;
    }

    CImg<Tfloat> get_RGBtoHSL() const {
      return CImg< Tfloat>(*this,false).RGBtoHSL();
    }

    //! Convert color pixels from (H,S,L) to (R,G,B).
    CImg<T>& HSLtoRGB() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "HSLtoRGB() : Instance is not a HSL image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          H = (Tfloat)*p1,
          S = (Tfloat)*p2,
          L = (Tfloat)*p3,
          q = 2*L<1?L*(1+S):(L+S-L*S),
          p = 2*L-q,
          h = H/360,
          tr = h + 1.0f/3,
          tg = h,
          tb = h - 1.0f/3,
          ntr = tr<0?tr+1:(tr>1?tr-1:tr),
          ntg = tg<0?tg+1:(tg>1?tg-1:tg),
          ntb = tb<0?tb+1:(tb>1?tb-1:tb),
          R = 255*(6*ntr<1?p+(q-p)*6*ntr:(2*ntr<1?q:(3*ntr<2?p+(q-p)*6*(2.0f/3-ntr):p))),
          G = 255*(6*ntg<1?p+(q-p)*6*ntg:(2*ntg<1?q:(3*ntg<2?p+(q-p)*6*(2.0f/3-ntg):p))),
          B = 255*(6*ntb<1?p+(q-p)*6*ntb:(2*ntb<1?q:(3*ntb<2?p+(q-p)*6*(2.0f/3-ntb):p)));
        *(p1++) = (T)(R<0?0:(R>255?255:R));
        *(p2++) = (T)(G<0?0:(G>255?255:G));
        *(p3++) = (T)(B<0?0:(B>255?255:B));
      }
      return *this;
    }

    CImg<Tuchar> get_HSLtoRGB() const {
      return CImg<Tuchar>(*this,false).HSLtoRGB();
    }

    //! Convert color pixels from (R,G,B) to (H,S,I).
    //! Reference: "Digital Image Processing, 2nd. edition", R. Gonzalez and R. Woods. Prentice Hall, 2002.
    CImg<T>& RGBtoHSI() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "RGBtoHSI() : Instance is not a RGB image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          R = (Tfloat)*p1,
          G = (Tfloat)*p2,
          B = (Tfloat)*p3,
          nR = (R<0?0:(R>255?255:R))/255,
          nG = (G<0?0:(G>255?255:G))/255,
          nB = (B<0?0:(B>255?255:B))/255,
          m = cimg::min(nR,nG,nB),
          theta = (Tfloat)(std::acos(0.5f*((nR-nG)+(nR-nB))/std::sqrt(std::pow(nR-nG,2)+(nR-nB)*(nG-nB)))*180/cimg::PI),
          sum = nR + nG + nB;
        Tfloat H = 0, S = 0, I = 0;
        if (theta>0) H = (nB<=nG)?theta:360-theta;
        if (sum>0) S = 1 - 3/sum*m;
        I = sum/3;
        *(p1++) = (T)H;
        *(p2++) = (T)S;
        *(p3++) = (T)I;
      }
      return *this;
    }

    CImg<Tfloat> get_RGBtoHSI() const {
      return CImg<Tfloat>(*this,false).RGBtoHSI();
    }

    //! Convert color pixels from (H,S,I) to (R,G,B).
    CImg<T>& HSItoRGB() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "HSItoRGB() : Instance is not a HSI image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        Tfloat
          H = (Tfloat)*p1,
          S = (Tfloat)*p2,
          I = (Tfloat)*p3,
          a = I*(1-S),
          R = 0, G = 0, B = 0;
        if (H<120) {
          B = a;
          R = (Tfloat)(I*(1+S*std::cos(H*cimg::PI/180)/std::cos((60-H)*cimg::PI/180)));
          G = 3*I-(R+B);
        } else if (H<240) {
          H-=120;
          R = a;
          G = (Tfloat)(I*(1+S*std::cos(H*cimg::PI/180)/std::cos((60-H)*cimg::PI/180)));
          B = 3*I-(R+G);
        } else {
          H-=240;
          G = a;
          B = (Tfloat)(I*(1+S*std::cos(H*cimg::PI/180)/std::cos((60-H)*cimg::PI/180)));
          R = 3*I-(G+B);
        }
        R*=255; G*=255; B*=255;
        *(p1++) = (T)(R<0?0:(R>255?255:R));
        *(p2++) = (T)(G<0?0:(G>255?255:G));
        *(p3++) = (T)(B<0?0:(B>255?255:B));
      }
      return *this;
    }

    CImg<Tfloat> get_HSItoRGB() const {
      return CImg< Tuchar>(*this,false).HSItoRGB();
    }

    //! Convert color pixels from (R,G,B) to (Y,Cb,Cr).
    CImg<T>& RGBtoYCbCr() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "RGBtoYCbCr() : Instance is not a RGB image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          R = (Tfloat)*p1,
          G = (Tfloat)*p2,
          B = (Tfloat)*p3,
          Y = (66*R + 129*G + 25*B + 128)/256 + 16,
          Cb = (-38*R - 74*G + 112*B + 128)/256 + 128,
          Cr = (112*R - 94*G - 18*B + 128)/256 + 128;
        *(p1++) = (T)(Y<0?0:(Y>255?255:Y));
        *(p2++) = (T)(Cb<0?0:(Cb>255?255:Cb));
        *(p3++) = (T)(Cr<0?0:(Cr>255?255:Cr));
      }
      return *this;
    }

    CImg<Tuchar> get_RGBtoYCbCr() const {
      return CImg<Tuchar>(*this,false).RGBtoYCbCr();
    }

    //! Convert color pixels from (R,G,B) to (Y,Cb,Cr).
    CImg<T>& YCbCrtoRGB() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "YCbCrtoRGB() : Instance is not a YCbCr image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          Y = (Tfloat)*p1 - 16,
          Cb = (Tfloat)*p2 - 128,
          Cr = (Tfloat)*p3 - 128,
          R = (298*Y + 409*Cr + 128)/256,
          G = (298*Y - 100*Cb - 208*Cr + 128)/256,
          B = (298*Y + 516*Cb + 128)/256;
        *(p1++) = (T)(R<0?0:(R>255?255:R));
        *(p2++) = (T)(G<0?0:(G>255?255:G));
        *(p3++) = (T)(B<0?0:(B>255?255:B));
      }
      return *this;
    }

    CImg<Tuchar> get_YCbCrtoRGB() const {
      return CImg<Tuchar>(*this,false).YCbCrtoRGB();
    }

    //! Convert color pixels from (R,G,B) to (Y,U,V).
    CImg<T>& RGBtoYUV() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "RGBtoYUV() : Instance is not a RGB image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          R = (Tfloat)*p1/255,
          G = (Tfloat)*p2/255,
          B = (Tfloat)*p3/255,
          Y = 0.299f*R + 0.587f*G + 0.114f*B;
        *(p1++) = (T)Y;
        *(p2++) = (T)(0.492f*(B-Y));
        *(p3++) = (T)(0.877*(R-Y));
      }
      return *this;
    }

    CImg<Tfloat> get_RGBtoYUV() const {
      return CImg<Tfloat>(*this,false).RGBtoYUV();
    }

    //! Convert color pixels from (Y,U,V) to (R,G,B).
    CImg<T>& YUVtoRGB() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "YUVtoRGB() : Instance is not a YUV image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          Y = (Tfloat)*p1,
          U = (Tfloat)*p2,
          V = (Tfloat)*p3,
          R = (Y + 1.140f*V)*255,
          G = (Y - 0.395f*U - 0.581f*V)*255,
          B = (Y + 2.032f*U)*255;
        *(p1++) = (T)(R<0?0:(R>255?255:R));
        *(p2++) = (T)(G<0?0:(G>255?255:G));
        *(p3++) = (T)(B<0?0:(B>255?255:B));
      }
      return *this;
    }

    CImg<Tuchar> get_YUVtoRGB() const {
      return CImg< Tuchar>(*this,false).YUVtoRGB();
    }

    //! Convert color pixels from (R,G,B) to (C,M,Y).
    CImg<T>& RGBtoCMY() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "RGBtoCMY() : Instance is not a RGB image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          R = (Tfloat)*p1,
          G = (Tfloat)*p2,
          B = (Tfloat)*p3,
          C = 255 - R,
          M = 255 - G,
          Y = 255 - B;
        *(p1++) = (T)(C<0?0:(C>255?255:C));
        *(p2++) = (T)(M<0?0:(M>255?255:M));
        *(p3++) = (T)(Y<0?0:(Y>255?255:Y));
      }
      return *this;
    }

    CImg<Tuchar> get_RGBtoCMY() const {
      return CImg<Tfloat>(*this,false).RGBtoCMY();
    }

    //! Convert (C,M,Y) pixels of a color image into the (R,G,B) color space.
    CImg<T>& CMYtoRGB() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "CMYtoRGB() : Instance is not a CMY image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          C = (Tfloat)*p1,
          M = (Tfloat)*p2,
          Y = (Tfloat)*p3,
          R = 255 - C,
          G = 255 - M,
          B = 255 - Y;
        *(p1++) = (T)(R<0?0:(R>255?255:R));
        *(p2++) = (T)(G<0?0:(G>255?255:G));
        *(p3++) = (T)(B<0?0:(B>255?255:B));
      }
      return *this;
    }

    CImg<Tuchar> get_CMYtoRGB() const {
      return CImg<Tuchar>(*this,false).CMYtoRGB();
    }

    //! Convert color pixels from (C,M,Y) to (C,M,Y,K).
    CImg<T>& CMYtoCMYK() {
      return get_CMYtoCMYK().move_to(*this);
    }

    CImg<Tuchar> get_CMYtoCMYK() const {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "CMYtoCMYK() : Instance is not a CMY image.",
                                    cimg_instance);

      CImg<Tfloat> res(_width,_height,_depth,4);
      const T *ps1 = data(0,0,0,0), *ps2 = data(0,0,0,1), *ps3 = data(0,0,0,2);
      Tfloat *pd1 = res.data(0,0,0,0), *pd2 = res.data(0,0,0,1), *pd3 = res.data(0,0,0,2), *pd4 = res.data(0,0,0,3);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        Tfloat
          C = (Tfloat)*(ps1++),
          M = (Tfloat)*(ps2++),
          Y = (Tfloat)*(ps3++),
          K = cimg::min(C,M,Y);
        if (K>=255) C = M = Y = 0;
        else { const Tfloat K1 = 255 - K; C = 255*(C - K)/K1; M = 255*(M - K)/K1; Y = 255*(Y - K)/K1; }
        *(pd1++) = (Tfloat)(C<0?0:(C>255?255:C));
        *(pd2++) = (Tfloat)(M<0?0:(M>255?255:M));
        *(pd3++) = (Tfloat)(Y<0?0:(Y>255?255:Y));
        *(pd4++) = (Tfloat)(K<0?0:(K>255?255:K));
      }
      return res;
    }

    //! Convert (C,M,Y,K) pixels of a color image into the (C,M,Y) color space.
    CImg<T>& CMYKtoCMY() {
      return get_CMYKtoCMY().move_to(*this);
    }

    CImg<Tfloat> get_CMYKtoCMY() const {
      if (_spectrum!=4)
        throw CImgInstanceException(_cimg_instance
                                    "CMYKtoCMY() : Instance is not a CMYK image.",
                                    cimg_instance);

      CImg<Tfloat> res(_width,_height,_depth,3);
      const T *ps1 = data(0,0,0,0), *ps2 = data(0,0,0,1), *ps3 = data(0,0,0,2), *ps4 = data(0,0,0,3);
      Tfloat *pd1 = res.data(0,0,0,0), *pd2 = res.data(0,0,0,1), *pd3 = res.data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          C = (Tfloat)*(ps1++),
          M = (Tfloat)*(ps2++),
          Y = (Tfloat)*(ps3++),
          K = (Tfloat)*(ps4++),
          K1 = 1 - K/255,
          nC = C*K1 + K,
          nM = M*K1 + K,
          nY = Y*K1 + K;
        *(pd1++) = (Tfloat)(nC<0?0:(nC>255?255:nC));
        *(pd2++) = (Tfloat)(nM<0?0:(nM>255?255:nM));
        *(pd3++) = (Tfloat)(nY<0?0:(nY>255?255:nY));
      }
      return res;
    }

    //! Convert color pixels from (R,G,B) to (X,Y,Z)_709.
    CImg<T>& RGBtoXYZ() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "RGBtoXYZ() : Instance is not a RGB image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          R = (Tfloat)*p1/255,
          G = (Tfloat)*p2/255,
          B = (Tfloat)*p3/255;
        *(p1++) = (T)(0.412453f*R + 0.357580f*G + 0.180423f*B);
        *(p2++) = (T)(0.212671f*R + 0.715160f*G + 0.072169f*B);
        *(p3++) = (T)(0.019334f*R + 0.119193f*G + 0.950227f*B);
      }
      return *this;
    }

    CImg<Tfloat> get_RGBtoXYZ() const {
      return CImg<Tfloat>(*this,false).RGBtoXYZ();
    }

    //! Convert (X,Y,Z)_709 pixels of a color image into the (R,G,B) color space.
    CImg<T>& XYZtoRGB() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "XYZtoRGB() : Instance is not a XYZ image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          X = (Tfloat)*p1*255,
          Y = (Tfloat)*p2*255,
          Z = (Tfloat)*p3*255,
          R = 3.240479f*X  - 1.537150f*Y - 0.498535f*Z,
          G = -0.969256f*X + 1.875992f*Y + 0.041556f*Z,
          B = 0.055648f*X  - 0.204043f*Y + 1.057311f*Z;
        *(p1++) = (T)(R<0?0:(R>255?255:R));
        *(p2++) = (T)(G<0?0:(G>255?255:G));
        *(p3++) = (T)(B<0?0:(B>255?255:B));
      }
      return *this;
    }

    CImg<Tuchar> get_XYZtoRGB() const {
      return CImg<Tuchar>(*this,false).XYZtoRGB();
    }

    //! Convert (X,Y,Z)_709 pixels of a color image into the (L*,a*,b*) color space.
    CImg<T>& XYZtoLab() {
#define _cimg_Labf(x) ((x)>=0.008856f?(std::pow(x,(Tfloat)1/3)):(7.787f*(x)+16.0f/116))

      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "XYZtoLab() : Instance is not a XYZ image.",
                                    cimg_instance);

      const Tfloat
        Xn = (Tfloat)(0.412453f + 0.357580f + 0.180423f),
        Yn = (Tfloat)(0.212671f + 0.715160f + 0.072169f),
        Zn = (Tfloat)(0.019334f + 0.119193f + 0.950227f);
      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          X = (Tfloat)*p1,
          Y = (Tfloat)*p2,
          Z = (Tfloat)*p3,
          XXn = X/Xn, YYn = Y/Yn, ZZn = Z/Zn,
          fX = (Tfloat)_cimg_Labf(XXn),
          fY = (Tfloat)_cimg_Labf(YYn),
          fZ = (Tfloat)_cimg_Labf(ZZn);
        *(p1++) = (T)(116*fY - 16);
        *(p2++) = (T)(500*(fX - fY));
        *(p3++) = (T)(200*(fY - fZ));
      }
      return *this;
    }

    CImg<Tfloat> get_XYZtoLab() const {
      return CImg<Tfloat>(*this,false).XYZtoLab();
    }

    //! Convert (L,a,b) pixels of a color image into the (X,Y,Z) color space.
    CImg<T>& LabtoXYZ() {
#define _cimg_Labfi(x) ((x)>=0.206893f?((x)*(x)*(x)):(((x)-16.0f/116)/7.787f))

      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "LabtoXYZ() : Instance is not a Lab image.",
                                    cimg_instance);

      const Tfloat
        Xn = (Tfloat)(0.412453f + 0.357580f + 0.180423f),
        Yn = (Tfloat)(0.212671f + 0.715160f + 0.072169f),
        Zn = (Tfloat)(0.019334f + 0.119193f + 0.950227f);
      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          L = (Tfloat)*p1,
          a = (Tfloat)*p2,
          b = (Tfloat)*p3,
          cY = (L + 16)/116,
          Y = (Tfloat)(Yn*_cimg_Labfi(cY)),
          pY = (Tfloat)std::pow(Y/Yn,(Tfloat)1/3),
          cX = a/500 + pY,
          X = Xn*cX*cX*cX,
          cZ = pY - b/200,
          Z = Zn*cZ*cZ*cZ;
        *(p1++) = (T)(X);
        *(p2++) = (T)(Y);
        *(p3++) = (T)(Z);
      }
      return *this;
    }

    CImg<Tfloat> get_LabtoXYZ() const {
      return CImg<Tfloat>(*this,false).LabtoXYZ();
    }

    //! Convert (X,Y,Z)_709 pixels of a color image into the (x,y,Y) color space.
    CImg<T>& XYZtoxyY() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "XYZtoxyY() : Instance is not a XYZ image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
          X = (Tfloat)*p1,
          Y = (Tfloat)*p2,
          Z = (Tfloat)*p3,
          sum = (X+Y+Z),
          nsum = sum>0?sum:1;
        *(p1++) = (T)(X/nsum);
        *(p2++) = (T)(Y/nsum);
        *(p3++) = (T)Y;
      }
      return *this;
    }

    CImg<Tfloat> get_XYZtoxyY() const {
      return CImg<Tfloat>(*this,false).XYZtoxyY();
    }

    //! Convert (x,y,Y) pixels of a color image into the (X,Y,Z)_709 color space.
    CImg<T>& xyYtoXYZ() {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "xyYtoXYZ() : Instance is not a xyY image.",
                                    cimg_instance);

      T *p1 = data(0,0,0,0), *p2 = data(0,0,0,1), *p3 = data(0,0,0,2);
      for (unsigned int N = _width*_height*_depth; N; --N) {
        const Tfloat
         px = (Tfloat)*p1,
         py = (Tfloat)*p2,
         Y = (Tfloat)*p3,
         ny = py>0?py:1;
        *(p1++) = (T)(px*Y/ny);
        *(p2++) = (T)Y;
        *(p3++) = (T)((1-px-py)*Y/ny);
      }
      return *this;
    }

    CImg<Tfloat> get_xyYtoXYZ() const {
      return CImg<Tfloat>(*this,false).xyYtoXYZ();
    }

    //! Convert a (R,G,B) image to a (L,a,b) one.
    CImg<T>& RGBtoLab() {
      return RGBtoXYZ().XYZtoLab();
    }

    CImg<Tfloat> get_RGBtoLab() const {
      return CImg<Tfloat>(*this,false).RGBtoLab();
    }

    //! Convert a (L,a,b) image to a (R,G,B) one.
    CImg<T>& LabtoRGB() {
      return LabtoXYZ().XYZtoRGB();
    }

    CImg<Tuchar> get_LabtoRGB() const {
      return CImg<Tuchar>(*this,false).LabtoRGB();
    }

    //! Convert a (R,G,B) image to a (x,y,Y) one.
    CImg<T>& RGBtoxyY() {
      return RGBtoXYZ().XYZtoxyY();
    }

    CImg<Tfloat> get_RGBtoxyY() const {
      return CImg<Tfloat>(*this,false).RGBtoxyY();
    }

    //! Convert a (x,y,Y) image to a (R,G,B) one.
    CImg<T>& xyYtoRGB() {
      return xyYtoXYZ().XYZtoRGB();
    }

    CImg<Tuchar> get_xyYtoRGB() const {
      return CImg<Tuchar>(*this,false).xyYtoRGB();
    }

    //! Convert a (R,G,B) image to a (C,M,Y,K) one.
    CImg<T>& RGBtoCMYK() {
      return RGBtoCMY().CMYtoCMYK();
    }

    CImg<Tfloat> get_RGBtoCMYK() const {
      return CImg<Tfloat>(*this,false).RGBtoCMYK();
    }

    //! Convert a (C,M,Y,K) image to a (R,G,B) one.
    CImg<T>& CMYKtoRGB() {
      return CMYKtoCMY().CMYtoRGB();
    }

    CImg<Tuchar> get_CMYKtoRGB() const {
      return CImg<Tuchar>(*this,false).CMYKtoRGB();
    }

    //! Convert a (R,G,B) image to a Bayer-coded representation.
    /**
       \note First (upper-left) pixel if the red component of the pixel color.
    **/
    CImg<T>& RGBtoBayer() {
      return get_RGBtoBayer().move_to(*this);
    }

    CImg<T> get_RGBtoBayer() const {
      if (_spectrum!=3)
        throw CImgInstanceException(_cimg_instance
                                    "RGBtoBayer() : Instance is not a RGB image.",
                                    cimg_instance);

      CImg<T> res(_width,_height,_depth,1);
      const T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
      T *ptrd = res._data;
      cimg_forXYZ(*this,x,y,z) {
        if (y%2) {
          if (x%2) *(ptrd++) = *ptr_b;
          else *(ptrd++) = *ptr_g;
        } else {
          if (x%2) *(ptrd++) = *ptr_g;
          else *(ptrd++) = *ptr_r;
        }
        ++ptr_r; ++ptr_g; ++ptr_b;
      }
      return res;
    }

    //! Convert a Bayer-coded image to a (R,G,B) color image.
    CImg<T>& BayertoRGB(const unsigned int interpolation_type=3) {
      return get_BayertoRGB(interpolation_type).move_to(*this);
    }

    CImg<Tuchar> get_BayertoRGB(const unsigned int interpolation_type=3) const {
      if (_spectrum!=1)
        throw CImgInstanceException(_cimg_instance
                                    "BayertoRGB() : Instance is not a Bayer image.",
                                    cimg_instance);

      CImg<Tuchar> res(_width,_height,_depth,3);
      CImg_3x3(I,T);
      Tuchar *ptr_r = res.data(0,0,0,0), *ptr_g = res.data(0,0,0,1), *ptr_b = res.data(0,0,0,2);
      switch (interpolation_type) {
      case 3 : { // Edge-directed
        CImg_3x3(R,T);
        CImg_3x3(G,T);
        CImg_3x3(B,T);
        cimg_forXYZ(*this,x,y,z) {
          const int _p1x = x?x-1:1, _p1y = y?y-1:1, _n1x = x<width()-1?x+1:x-1, _n1y = y<height()-1?y+1:y-1;
          cimg_get3x3(*this,x,y,z,0,I,T);
          if (y%2) {
            if (x%2) {
              const Tfloat alpha = cimg::sqr((Tfloat)Inc - Ipc), beta = cimg::sqr((Tfloat)Icn - Icp), cx = 1/(1+alpha), cy = 1/(1+beta);
              *ptr_g = (Tuchar)((cx*(Inc+Ipc) + cy*(Icn+Icp))/(2*(cx+cy)));
            } else *ptr_g = (Tuchar)Icc;
          } else {
            if (x%2) *ptr_g = (Tuchar)Icc;
            else {
              const Tfloat alpha = cimg::sqr((Tfloat)Inc - Ipc), beta = cimg::sqr((Tfloat)Icn - Icp), cx = 1/(1+alpha), cy = 1/(1+beta);
              *ptr_g = (Tuchar)((cx*(Inc+Ipc) + cy*(Icn+Icp))/(2*(cx+cy)));
            }
          }
          ++ptr_g;
        }
        cimg_forXYZ(*this,x,y,z) {
          const int _p1x = x?x-1:1, _p1y = y?y-1:1, _n1x = x<width()-1?x+1:x-1, _n1y = y<height()-1?y+1:y-1;
          cimg_get3x3(*this,x,y,z,0,I,T);
          cimg_get3x3(res,x,y,z,1,G,T);
          if (y%2) {
            if (x%2) *ptr_b = (Tuchar)Icc;
            else { *ptr_r = (Tuchar)((Icn+Icp)/2); *ptr_b = (Tuchar)((Inc+Ipc)/2); }
          } else {
            if (x%2) { *ptr_r = (Tuchar)((Inc+Ipc)/2); *ptr_b = (Tuchar)((Icn+Icp)/2); }
            else *ptr_r = (Tuchar)Icc;
          }
          ++ptr_r; ++ptr_b;
        }
        ptr_r = res.data(0,0,0,0);
        ptr_g = res.data(0,0,0,1);
        ptr_b = res.data(0,0,0,2);
        cimg_forXYZ(*this,x,y,z) {
          const int _p1x = x?x-1:1, _p1y = y?y-1:1, _n1x = x<width()-1?x+1:x-1, _n1y = y<height()-1?y+1:y-1;
          cimg_get3x3(res,x,y,z,0,R,T);
          cimg_get3x3(res,x,y,z,1,G,T);
          cimg_get3x3(res,x,y,z,2,B,T);
          if (y%2) {
            if (x%2) {
              const float alpha = (float)cimg::sqr(Rnc-Rpc), beta = (float)cimg::sqr(Rcn-Rcp), cx = 1/(1+alpha), cy = 1/(1+beta);
              *ptr_r = (Tuchar)((cx*(Rnc+Rpc) + cy*(Rcn+Rcp))/(2*(cx+cy)));
            }
          } else {
            if (!(x%2)) {
              const float alpha = (float)cimg::sqr(Bnc-Bpc), beta = (float)cimg::sqr(Bcn-Bcp), cx = 1/(1+alpha), cy = 1/(1+beta);
              *ptr_b = (Tuchar)((cx*(Bnc+Bpc) + cy*(Bcn+Bcp))/(2*(cx+cy)));
            }
          }
          ++ptr_r; ++ptr_g; ++ptr_b;
        }
      } break;
      case 2 : { // Linear interpolation
        cimg_forXYZ(*this,x,y,z) {
          const int _p1x = x?x-1:1, _p1y = y?y-1:1, _n1x = x<width()-1?x+1:x-1, _n1y = y<height()-1?y+1:y-1;
          cimg_get3x3(*this,x,y,z,0,I,T);
          if (y%2) {
            if (x%2) { *ptr_r = (Tuchar)((Ipp+Inn+Ipn+Inp)/4); *ptr_g = (Tuchar)((Inc+Ipc+Icn+Icp)/4); *ptr_b = (Tuchar)Icc; }
            else { *ptr_r = (Tuchar)((Icp+Icn)/2); *ptr_g = (Tuchar)Icc; *ptr_b = (Tuchar)((Inc+Ipc)/2); }
          } else {
            if (x%2) { *ptr_r = (Tuchar)((Ipc+Inc)/2); *ptr_g = (Tuchar)Icc; *ptr_b = (Tuchar)((Icn+Icp)/2); }
            else { *ptr_r = (Tuchar)Icc; *ptr_g = (Tuchar)((Inc+Ipc+Icn+Icp)/4); *ptr_b = (Tuchar)((Ipp+Inn+Ipn+Inp)/4); }
          }
          ++ptr_r; ++ptr_g; ++ptr_b;
        }
      } break;
      case 1 : { // Nearest neighbor interpolation
        cimg_forXYZ(*this,x,y,z) {
          const int _p1x = x?x-1:1, _p1y = y?y-1:1, _n1x = x<width()-1?x+1:x-1, _n1y = y<height()-1?y+1:y-1;
          cimg_get3x3(*this,x,y,z,0,I,T);
          if (y%2) {
            if (x%2) { *ptr_r = (Tuchar)cimg::min(Ipp,Inn,Ipn,Inp); *ptr_g = (Tuchar)cimg::min(Inc,Ipc,Icn,Icp); *ptr_b = (Tuchar)Icc; }
            else { *ptr_r = (Tuchar)cimg::min(Icn,Icp); *ptr_g = (Tuchar)Icc; *ptr_b = (Tuchar)cimg::min(Inc,Ipc); }
          } else {
            if (x%2) { *ptr_r = (Tuchar)cimg::min(Inc,Ipc); *ptr_g = (Tuchar)Icc; *ptr_b = (Tuchar)cimg::min(Icn,Icp); }
            else { *ptr_r = (Tuchar)Icc; *ptr_g = (Tuchar)cimg::min(Inc,Ipc,Icn,Icp); *ptr_b = (Tuchar)cimg::min(Ipp,Inn,Ipn,Inp); }
          }
          ++ptr_r; ++ptr_g; ++ptr_b;
        }
      } break;
      default : { // 0-filling interpolation
        const T *ptrs = _data;
        res.fill(0);
        cimg_forXYZ(*this,x,y,z) {
          const T val = *(ptrs++);
          if (y%2) { if (x%2) *ptr_b = val; else *ptr_g = val; } else { if (x%2) *ptr_g = val; else *ptr_r = val; }
          ++ptr_r; ++ptr_g; ++ptr_b;
        }
      }
      }
      return res;
    }

    //@}
    //------------------------------------------
    //
    //! \name Geometric / Spatial Manipulation
    //@{
    //------------------------------------------

    static float _cimg_lanczos(const float x) {
      if (x<=-2 || x>=2) return 0;
      const float a = (float)cimg::PI*x, b = 0.5f*a;
      return (float)(x?std::sin(a)*std::sin(b)/(a*b):1);
    }

    //! Resize an image.
    /**
       \param size_x Number of columns (new size along the X-axis).
       \param size_y Number of rows (new size along the Y-axis).
       \param size_z Number of slices (new size along the Z-axis).
       \param size_c Number of vector-channels (new size along the C-axis).
       \param interpolation_type Method of interpolation :
       - -1 = no interpolation : raw memory resizing.
       - 0 = no interpolation : additional space is filled according to \p border_condition.
       - 1 = nearest-neighbor interpolation.
       - 2 = moving average interpolation.
       - 3 = linear interpolation.
       - 4 = grid interpolation.
       - 5 = bicubic interpolation.
       - 6 = lanczos interpolation.
       \param border_conditions Border condition type.
       \param centering_x Set centering type (only if \p interpolation_type=0).
       \param centering_y Set centering type (only if \p interpolation_type=0).
       \param centering_z Set centering type (only if \p interpolation_type=0).
       \param centering_c Set centering type (only if \p interpolation_type=0).
       \note If pd[x,y,z,v]<0, it corresponds to a percentage of the original size (the default value is -100).
    **/
    CImg<T>& resize(const int size_x, const int size_y=-100,
                    const int size_z=-100, const int size_c=-100,
                    const int interpolation_type=1, const unsigned int border_conditions=0,
                    const float centering_x = 0, const float centering_y = 0,
                    const float centering_z = 0, const float centering_c = 0) {
      if (!size_x || !size_y || !size_z || !size_c) return assign();
      const unsigned int
        _sx = (unsigned int)(size_x<0?-size_x*_width/100:size_x),
        _sy = (unsigned int)(size_y<0?-size_y*_height/100:size_y),
        _sz = (unsigned int)(size_z<0?-size_z*_depth/100:size_z),
        _sc = (unsigned int)(size_c<0?-size_c*_spectrum/100:size_c),
        sx = _sx?_sx:1, sy = _sy?_sy:1, sz = _sz?_sz:1, sc = _sc?_sc:1;
      if (sx==_width && sy==_height && sz==_depth && sc==_spectrum) return *this;
      if (is_empty()) return assign(sx,sy,sz,sc,0);
      if (interpolation_type==-1 && sx*sy*sz*sc==size()) {
        _width = sx; _height = sy; _depth = sz; _spectrum = sc;
        return *this;
      }
      return get_resize(sx,sy,sz,sc,interpolation_type,border_conditions,centering_x,centering_y,centering_z,centering_c).move_to(*this);
    }

    CImg<T> get_resize(const int size_x, const int size_y = -100,
                       const int size_z = -100, const int size_c = -100,
                       const int interpolation_type=1, const unsigned int border_conditions=0,
                       const float centering_x = 0, const float centering_y = 0,
                       const float centering_z = 0, const float centering_c = 0) const {
      if (centering_x<0 || centering_x>1 || centering_y<0 || centering_y>1 ||
          centering_z<0 || centering_z>1 || centering_c<0 || centering_c>1)
        throw CImgArgumentException(_cimg_instance
                                    "resize() : Specified centering arguments (%g,%g,%g,%g) are outside range [0,1].",
                                    cimg_instance,
                                    centering_x,centering_y,centering_z,centering_c);

      if (!size_x || !size_y || !size_z || !size_c) return CImg<T>();
      const unsigned int
        _sx = (unsigned int)(size_x<0?-size_x*_width/100:size_x),
        _sy = (unsigned int)(size_y<0?-size_y*_height/100:size_y),
        _sz = (unsigned int)(size_z<0?-size_z*_depth/100:size_z),
        _sc = (unsigned int)(size_c<0?-size_c*_spectrum/100:size_c),
        sx = _sx?_sx:1, sy = _sy?_sy:1, sz = _sz?_sz:1, sc = _sc?_sc:1;
      if (sx==_width && sy==_height && sz==_depth && sc==_spectrum) return +*this;
      if (is_empty()) return CImg<T>(sx,sy,sz,sc,0);

      CImg<T> res;
      switch (interpolation_type) {

        // Raw resizing.
        //
      case -1 :
        std::memcpy(res.assign(sx,sy,sz,sc,0)._data,_data,sizeof(T)*cimg::min(size(),sx*sy*sz*sc));
        break;

        // No interpolation.
        //
      case 0 : {
        const int
          xc = (int)(centering_x*((int)sx - width())),
          yc = (int)(centering_y*((int)sy - height())),
          zc = (int)(centering_z*((int)sz - depth())),
          cc = (int)(centering_c*((int)sc - spectrum()));

        switch (border_conditions) {
        case 2 : { // Cyclic borders.
          res.assign(sx,sy,sz,sc);
          const int
            x0 = ((int)xc%width()) - width(),
            y0 = ((int)yc%height()) - height(),
            z0 = ((int)zc%depth()) - depth(),
            c0 = ((int)cc%spectrum()) - spectrum();
          for (int c = c0; c<(int)sc; c+=spectrum())
            for (int z = z0; z<(int)sz; z+=depth())
              for (int y = y0; y<(int)sy; y+=height())
                for (int x = x0; x<(int)sx; x+=width())
                  res.draw_image(x,y,z,c,*this);
        } break;
        case 1 : { // Neumann borders.
          res.assign(sx,sy,sz,sc).draw_image(xc,yc,zc,cc,*this);
          CImg<T> sprite;
          if (xc>0) {  // X-backward
            res.get_crop(xc,yc,zc,cc,xc,yc+height()-1,zc+depth()-1,cc+spectrum()-1).move_to(sprite);
            for (int x = xc-1; x>=0; --x) res.draw_image(x,yc,zc,cc,sprite);
          }
          if (xc+width()<(int)sx) { // X-forward
            res.get_crop(xc+width()-1,yc,zc,cc,xc+width()-1,yc+height()-1,zc+depth()-1,cc+spectrum()-1).move_to(sprite);
            for (int x = xc+width(); x<(int)sx; ++x) res.draw_image(x,yc,zc,cc,sprite);
          }
          if (yc>0) {  // Y-backward
            res.get_crop(0,yc,zc,cc,sx-1,yc,zc+depth()-1,cc+spectrum()-1).move_to(sprite);
            for (int y = yc-1; y>=0; --y) res.draw_image(0,y,zc,cc,sprite);
          }
          if (yc+height()<(int)sy) { // Y-forward
            res.get_crop(0,yc+height()-1,zc,cc,sx-1,yc+height()-1,zc+depth()-1,cc+spectrum()-1).move_to(sprite);
            for (int y = yc+height(); y<(int)sy; ++y) res.draw_image(0,y,zc,cc,sprite);
          }
          if (zc>0) {  // Z-backward
            res.get_crop(0,0,zc,cc,sx-1,sy-1,zc,cc+spectrum()-1).move_to(sprite);
            for (int z = zc-1; z>=0; --z) res.draw_image(0,0,z,cc,sprite);
          }
          if (zc+depth()<(int)sz) { // Z-forward
            res.get_crop(0,0,zc+depth()-1,cc,sx-1,sy-1,zc+depth()-1,cc+spectrum()-1).move_to(sprite);
            for (int z = zc+depth(); z<(int)sz; ++z) res.draw_image(0,0,z,cc,sprite);
          }
          if (cc>0) {  // C-backward
            res.get_crop(0,0,0,cc,sx-1,sy-1,sz-1,cc).move_to(sprite);
            for (int c = cc-1; c>=0; --c) res.draw_image(0,0,0,c,sprite);
          }
          if (cc+spectrum()<(int)sc) { // C-forward
            res.get_crop(0,0,0,cc+spectrum()-1,sx-1,sy-1,sz-1,cc+spectrum()-1).move_to(sprite);
            for (int c = cc+spectrum(); c<(int)sc; ++c) res.draw_image(0,0,0,c,sprite);
          }
        } break;
        default : // Dirichlet borders.
          res.assign(sx,sy,sz,sc,0).draw_image(xc,yc,zc,cc,*this);
        }
        break;
      } break;

        // Nearest neighbor interpolation.
        //
      case 1 : {
        res.assign(sx,sy,sz,sc);
        CImg<ulongT> off_x(sx), off_y(sy+1), off_z(sz+1), off_c(sc+1);
        unsigned long *poff_x, *poff_y, *poff_z, *poff_c, curr, old;
        const unsigned long
          wh = (unsigned long)_width*_height,
          whd = (unsigned long)_width*_height*_depth,
          sxy = (unsigned long)sx*sy,
          sxyz = (unsigned long)sx*sy*sz;
        if (sx==_width) off_x.fill(1);
        else {
          poff_x = off_x._data; curr = 0;
          cimg_forX(res,x) { old = curr; curr = ((x+1LU)*_width/sx); *(poff_x++) = curr - old; }
        }
        if (sy==_height) off_y.fill(_width);
        else {
          poff_y = off_y._data; curr = 0;
          cimg_forY(res,y) { old = curr; curr = ((y+1LU)*_height/sy); *(poff_y++) = _width*(curr - old); } *poff_y = 0;
        }
        if (sz==_depth) off_z.fill(wh);
        else {
          poff_z = off_z._data; curr = 0;
          cimg_forZ(res,z) { old = curr; curr = ((z+1LU)*_depth/sz); *(poff_z++) = wh*(curr - old); } *poff_z = 0;
        }
        if (sc==_spectrum) off_c.fill(whd);
        else {
          poff_c = off_c._data; curr = 0;
          cimg_forC(res,c) { old = curr; curr = ((c+1LU)*_spectrum/sc); *(poff_c++) = whd*(curr - old); } *poff_c = 0;
        }

        T *ptrd = res._data;
        const T* ptrv = _data;
        poff_c = off_c._data;
        for (unsigned int c = 0; c<sc; ) {
          const T *ptrz = ptrv;
          poff_z = off_z._data;
          for (unsigned int z = 0; z<sz; ) {
            const T *ptry = ptrz;
            poff_y = off_y._data;
            for (unsigned int y = 0; y<sy; ) {
              const T *ptrx = ptry;
              poff_x = off_x._data;
              cimg_forX(res,x) { *(ptrd++) = *ptrx; ptrx+=*(poff_x++); }
              ++y;
              unsigned long dy = *(poff_y++);
              for (;!dy && y<dy; std::memcpy(ptrd,ptrd - sx,sizeof(T)*sx), ++y, ptrd+=sx, dy = *(poff_y++)) {}
              ptry+=dy;
            }
            ++z;
            unsigned long dz = *(poff_z++);
            for (;!dz && z<dz; std::memcpy(ptrd,ptrd-sxy,sizeof(T)*sxy), ++z, ptrd+=sxy, dz = *(poff_z++)) {}
            ptrz+=dz;
          }
          ++c;
          unsigned long dc = *(poff_c++);
          for (;!dc && c<dc; std::memcpy(ptrd,ptrd-sxyz,sizeof(T)*sxyz), ++c, ptrd+=sxyz, dc = *(poff_c++)) {}
          ptrv+=dc;
        }
      } break;

        // Moving average.
        //
      case 2 : {
        bool instance_first = true;
        if (sx!=_width) {
          CImg<Tfloat> tmp(sx,_height,_depth,_spectrum,0);
          for (unsigned int a = _width*sx, b = _width, c = sx, s = 0, t = 0; a; ) {
            const unsigned int d = cimg::min(b,c);
            a-=d; b-=d; c-=d;
            cimg_forYZC(tmp,y,z,v) tmp(t,y,z,v)+=(Tfloat)(*this)(s,y,z,v)*d;
            if (!b) { cimg_forYZC(tmp,y,z,v) tmp(t,y,z,v)/=_width; ++t; b = _width; }
            if (!c) { ++s; c = sx; }
          }
          tmp.move_to(res);
          instance_first = false;
        }
        if (sy!=_height) {
          CImg<Tfloat> tmp(sx,sy,_depth,_spectrum,0);
          for (unsigned int a = _height*sy, b = _height, c = sy, s = 0, t = 0; a; ) {
            const unsigned int d = cimg::min(b,c);
            a-=d; b-=d; c-=d;
            if (instance_first) cimg_forXZC(tmp,x,z,v) tmp(x,t,z,v)+=(Tfloat)(*this)(x,s,z,v)*d;
            else cimg_forXZC(tmp,x,z,v) tmp(x,t,z,v)+=(Tfloat)res(x,s,z,v)*d;
            if (!b) { cimg_forXZC(tmp,x,z,v) tmp(x,t,z,v)/=_height; ++t; b = _height; }
            if (!c) { ++s; c = sy; }
          }
          tmp.move_to(res);
          instance_first = false;
        }
        if (sz!=_depth) {
          CImg<Tfloat> tmp(sx,sy,sz,_spectrum,0);
          for (unsigned int a = _depth*sz, b = _depth, c = sz, s = 0, t = 0; a; ) {
            const unsigned int d = cimg::min(b,c);
            a-=d; b-=d; c-=d;
            if (instance_first) cimg_forXYC(tmp,x,y,v) tmp(x,y,t,v)+=(Tfloat)(*this)(x,y,s,v)*d;
            else cimg_forXYC(tmp,x,y,v) tmp(x,y,t,v)+=(Tfloat)res(x,y,s,v)*d;
            if (!b) { cimg_forXYC(tmp,x,y,v) tmp(x,y,t,v)/=_depth; ++t; b = _depth; }
            if (!c) { ++s; c = sz; }
          }
          tmp.move_to(res);
          instance_first = false;
        }
        if (sc!=_spectrum) {
          CImg<Tfloat> tmp(sx,sy,sz,sc,0);
          for (unsigned int a = _spectrum*sc, b = _spectrum, c = sc, s = 0, t = 0; a; ) {
            const unsigned int d = cimg::min(b,c);
            a-=d; b-=d; c-=d;
            if (instance_first) cimg_forXYZ(tmp,x,y,z) tmp(x,y,z,t)+=(Tfloat)(*this)(x,y,z,s)*d;
            else cimg_forXYZ(tmp,x,y,z) tmp(x,y,z,t)+=(Tfloat)res(x,y,z,s)*d;
            if (!b) { cimg_forXYZ(tmp,x,y,z) tmp(x,y,z,t)/=_spectrum; ++t; b = _spectrum; }
            if (!c) { ++s; c = sc; }
          }
          tmp.move_to(res);
          instance_first = false;
        }
      } break;

        // Linear interpolation.
        //
      case 3 : {
        CImg<uintT> off(cimg::max(sx,sy,sz,sc));
        CImg<floatT> foff(off._width);
        unsigned int *poff;
        float *pfoff, old, curr;
        CImg<T> resx, resy, resz, resc;
        T *ptrd;

        if (sx!=_width) {
          if (_width==1) get_resize(sx,_height,_depth,_spectrum,1).move_to(resx);
          else {
            const float fx = (!border_conditions && sx>_width)?(sx>1?(_width-1.0f)/(sx-1):0):(float)_width/sx;
            resx.assign(sx,_height,_depth,_spectrum);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forX(resx,x) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fx; *(poff++) = (unsigned int)curr - (unsigned int)old; }
            ptrd = resx._data;
            const T *ptrs0 = _data;
            cimg_forYZC(resx,y,z,c) {
              poff = off._data; pfoff = foff._data;
              const T *ptrs = ptrs0, *const ptrsmax = ptrs0 + (_width-1);
              cimg_forX(resx,x) {
                const float alpha = *(pfoff++);
                const T val1 = *ptrs, val2 = ptrs<ptrsmax?*(ptrs+1):val1;
                *(ptrd++) = (T)((1-alpha)*val1 + alpha*val2);
                ptrs+=*(poff++);
              }
              ptrs0+=_width;
            }
          }
        } else resx.assign(*this,true);

        if (sy!=_height) {
          if (_height==1) resx.get_resize(sx,sy,_depth,_spectrum,1).move_to(resy);
          else {
            const float fy = (!border_conditions && sy>_height)?(sy>1?(_height-1.0f)/(sy-1):0):(float)_height/sy;
            resy.assign(sx,sy,_depth,_spectrum);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forY(resy,y) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fy; *(poff++) = sx*((unsigned int)curr-(unsigned int)old); }
            cimg_forXZC(resy,x,z,c) {
              ptrd = resy.data(x,0,z,c);
              const T *ptrs = resx.data(x,0,z,c), *const ptrsmax = ptrs + (_height-1)*sx;
              poff = off._data; pfoff = foff._data;
              cimg_forY(resy,y) {
                const float alpha = *(pfoff++);
                const T val1 = *ptrs, val2 = ptrs<ptrsmax?*(ptrs+sx):val1;
                *ptrd = (T)((1-alpha)*val1 + alpha*val2);
                ptrd+=sx;
                ptrs+=*(poff++);
              }
            }
          }
          resx.assign();
        } else resy.assign(resx,true);

        if (sz!=_depth) {
          if (_depth==1) resy.get_resize(sx,sy,sz,_spectrum,1).move_to(resz);
          else {
            const float fz = (!border_conditions && sz>_depth)?(sz>1?(_depth-1.0f)/(sz-1):0):(float)_depth/sz;
            const unsigned int sxy = sx*sy;
            resz.assign(sx,sy,sz,_spectrum);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forZ(resz,z) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fz; *(poff++) = sxy*((unsigned int)curr - (unsigned int)old); }
            cimg_forXYC(resz,x,y,c) {
              ptrd = resz.data(x,y,0,c);
              const T *ptrs = resy.data(x,y,0,c), *const ptrsmax = ptrs + (_depth-1)*sxy;
              poff = off._data; pfoff = foff._data;
              cimg_forZ(resz,z) {
                const float alpha = *(pfoff++);
                const T val1 = *ptrs, val2 = ptrs<ptrsmax?*(ptrs+sxy):val1;
                *ptrd = (T)((1-alpha)*val1 + alpha*val2);
                ptrd+=sxy;
                ptrs+=*(poff++);
              }
            }
          }
          resy.assign();
        } else resz.assign(resy,true);

        if (sc!=_spectrum) {
          if (_spectrum==1) resz.get_resize(sx,sy,sz,sc,1).move_to(resc);
          else {
            const float fc = (!border_conditions && sc>_spectrum)?(sc>1?(_spectrum-1.0f)/(sc-1):0):(float)_spectrum/sc;
            const unsigned int sxyz = sx*sy*sz;
            resc.assign(sx,sy,sz,sc);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forC(resc,c) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fc; *(poff++) = sxyz*((unsigned int)curr - (unsigned int)old); }
            cimg_forXYZ(resc,x,y,z) {
              ptrd = resc.data(x,y,z,0);
              const T *ptrs = resz.data(x,y,z,0), *const ptrsmax = ptrs + (_spectrum-1)*sxyz;
              poff = off._data; pfoff = foff._data;
              cimg_forC(resc,c) {
                const float alpha = *(pfoff++);
                const T val1 = *ptrs, val2 = ptrs<ptrsmax?*(ptrs+sxyz):val1;
                *ptrd = (T)((1-alpha)*val1 + alpha*val2);
                ptrd+=sxyz;
                ptrs+=*(poff++);
              }
            }
          }
          resz.assign();
        } else resc.assign(resz,true);
        return resc._is_shared?(resz._is_shared?(resy._is_shared?(resx._is_shared?(+(*this)):resx):resy):resz):resc;
      } break;

        // Grid interpolation.
        //
      case 4 : {
        CImg<T> resx, resy, resz, resc;
        const unsigned int sxy = sx*sy, sxyz = sx*sy*sz;
        if (sx!=_width) {
          if (sx<_width) get_resize(sx,_height,_depth,_spectrum,1).move_to(resx);
          else {
            resx.assign(sx,_height,_depth,_spectrum,0);
            const T *ptrs = _data;
            T *ptrd = resx._data + (int)(centering_x*(sx-1)/_width);
            cimg_forYZC(*this,y,z,c) {
              cimg_forX(*this,x) ptrd[x*sx/_width] = *(ptrs++);
              ptrd+=sx;
            }
          }
        } else resx.assign(*this,true);

        if (sy!=_height) {
          if (sy<_height) resx.get_resize(sx,sy,_depth,_spectrum,1).move_to(resy);
          else {
            resy.assign(sx,sy,_depth,_spectrum,0);
            const T *ptrs = resx._data;
            T *ptrd = resy._data + (int)(centering_y*(sy-1)/_height)*sx;
            cimg_forZC(*this,z,c) {
              cimg_forY(*this,y) { std::memcpy(ptrd + (y*sy/_height)*sx,ptrs,sizeof(T)*sx); ptrs+=sx; }
              ptrd+=sxy;
            }
          }
          resx.assign();
        } else resy.assign(resx,true);

        if (sz!=_depth) {
          if (sz<_depth) resy.get_resize(sx,sy,sz,_spectrum,1).move_to(resz);
          else {
            resz.assign(sx,sy,sz,_spectrum,0);
            const T *ptrs = resy._data;
            T *ptrd = resz._data + (int)(centering_z*(sz-1)/_depth)*sxy;
            cimg_forC(*this,c) {
              cimg_forZ(*this,z) { std::memcpy(ptrd + (z*sz/_depth)*sxy,ptrs,sizeof(T)*sxy); ptrs+=sxy; }
              ptrd+=sxyz;
            }
          }
          resy.assign();
        } else resz.assign(resy,true);

        if (sc!=_spectrum) {
          if (sc<_spectrum) resz.get_resize(sx,sy,sz,sc,1).move_to(resc);
          else {
            resc.assign(sx,sy,sz,sc,0);
            const T *ptrs = resz._data;
            T *ptrd = resc._data + (int)(centering_c*(sc-1)/_spectrum)*sxyz;
            cimg_forC(*this,c) { std::memcpy(ptrd + (c*sc/_spectrum)*sxyz,ptrs,sizeof(T)*sxyz); ptrs+=sxyz; }
          }
          resz.assign();
        } else resc.assign(resz,true);

        return resc._is_shared?(resz._is_shared?(resy._is_shared?(resx._is_shared?(+(*this)):resx):resy):resz):resc;
      } break;

        // Bicubic interpolation.
        //
      case 5 : {
        const Tfloat vmin = (Tfloat)cimg::type<T>::min(), vmax = (Tfloat)cimg::type<T>::max();
        CImg<uintT> off(cimg::max(sx,sy,sz,sc));
        CImg<floatT> foff(off._width);
        unsigned int *poff;
        float *pfoff, old, curr;
        CImg<T> resx, resy, resz, resc;
        T *ptrd;

        if (sx!=_width) {
          if (_width==1) get_resize(sx,_height,_depth,_spectrum,1).move_to(resx);
          else {
            const float fx = (!border_conditions && sx>_width)?(sx>1?(_width-1.0f)/(sx-1):0):(float)_width/sx;
            resx.assign(sx,_height,_depth,_spectrum);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forX(resx,x) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fx; *(poff++) = (unsigned int)curr - (unsigned int)old; }
            ptrd = resx._data;
            const T *ptrs0 = _data;
            cimg_forYZC(resx,y,z,c) {
              poff = off._data; pfoff = foff._data;
              const T *ptrs = ptrs0, *const ptrsmax = ptrs0 + (_width-2);
              cimg_forX(resx,x) {
                const float t = *(pfoff++);
                const Tfloat
                  val1 = (Tfloat)*ptrs,
                  val0 = ptrs>ptrs0?(Tfloat)*(ptrs-1):val1,
                  val2 = ptrs<=ptrsmax?(Tfloat)*(ptrs+1):val1,
                  val3 = ptrs<ptrsmax?(Tfloat)*(ptrs+2):val2,
                  val = val1 + 0.5f*(t*(-val0+val2) + t*t*(2*val0-5*val1+4*val2-val3) + t*t*t*(-val0+3*val1-3*val2+val3));
                *(ptrd++) = (T)(val<vmin?vmin:val>vmax?vmax:val);
                ptrs+=*(poff++);
              }
              ptrs0+=_width;
            }
          }
        } else resx.assign(*this,true);

        if (sy!=_height) {
          if (_height==1) resx.get_resize(sx,sy,_depth,_spectrum,1).move_to(resy);
          else {
            const float fy = (!border_conditions && sy>_height)?(sy>1?(_height-1.0f)/(sy-1):0):(float)_height/sy;
            resy.assign(sx,sy,_depth,_spectrum);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forY(resy,y) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fy; *(poff++) = sx*((unsigned int)curr-(unsigned int)old); }
            cimg_forXZC(resy,x,z,c) {
              ptrd = resy.data(x,0,z,c);
              const T *const ptrs0 = resx.data(x,0,z,c), *ptrs = ptrs0, *const ptrsmax = ptrs0 + (_height-2)*sx;
              poff = off._data; pfoff = foff._data;
              cimg_forY(resy,y) {
                const float t = *(pfoff++);
                const Tfloat
                  val1 = (Tfloat)*ptrs,
                  val0 = ptrs>ptrs0?(Tfloat)*(ptrs-sx):val1,
                  val2 = ptrs<=ptrsmax?(Tfloat)*(ptrs+sx):val1,
                  val3 = ptrs<ptrsmax?(Tfloat)*(ptrs+2*sx):val2,
                  val = val1 + 0.5f*(t*(-val0+val2) + t*t*(2*val0-5*val1+4*val2-val3) + t*t*t*(-val0+3*val1-3*val2+val3));
                *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
                ptrd+=sx;
                ptrs+=*(poff++);
              }
            }
          }
          resx.assign();
        } else resy.assign(resx,true);

        if (sz!=_depth) {
          if (_depth==1) resy.get_resize(sx,sy,sz,_spectrum,1).move_to(resz);
          else {
            const float fz = (!border_conditions && sz>_depth)?(sz>1?(_depth-1.0f)/(sz-1):0):(float)_depth/sz;
            const unsigned int sxy = sx*sy;
            resz.assign(sx,sy,sz,_spectrum);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forZ(resz,z) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fz; *(poff++) = sxy*((unsigned int)curr - (unsigned int)old); }
            cimg_forXYC(resz,x,y,c) {
              ptrd = resz.data(x,y,0,c);
              const T *const ptrs0 = resy.data(x,y,0,c), *ptrs = ptrs0, *const ptrsmax = ptrs0 + (_depth-2)*sxy;
              poff = off._data; pfoff = foff._data;
              cimg_forZ(resz,z) {
                const float t = *(pfoff++);
                const Tfloat
                  val1 = (Tfloat)*ptrs,
                  val0 = ptrs>ptrs0?(Tfloat)*(ptrs-sxy):val1,
                  val2 = ptrs<=ptrsmax?(Tfloat)*(ptrs+sxy):val1,
                  val3 = ptrs<ptrsmax?(Tfloat)*(ptrs+2*sxy):val2,
                  val = val1 + 0.5f*(t*(-val0+val2) + t*t*(2*val0-5*val1+4*val2-val3) + t*t*t*(-val0+3*val1-3*val2+val3));
                *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
                ptrd+=sxy;
                ptrs+=*(poff++);
              }
            }
          }
          resy.assign();
        } else resz.assign(resy,true);

        if (sc!=_spectrum) {
          if (_spectrum==1) resz.get_resize(sx,sy,sz,sc,1).move_to(resc);
          else {
            const float fc = (!border_conditions && sc>_spectrum)?(sc>1?(_spectrum-1.0f)/(sc-1):0):(float)_spectrum/sc;
            const unsigned int sxyz = sx*sy*sz;
            resc.assign(sx,sy,sz,sc);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forC(resc,c) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fc; *(poff++) = sxyz*((unsigned int)curr - (unsigned int)old); }
            cimg_forXYZ(resc,x,y,z) {
              ptrd = resc.data(x,y,z,0);
              const T *const ptrs0 = resz.data(x,y,z,0), *ptrs = ptrs0, *const ptrsmax = ptrs + (_spectrum-2)*sxyz;
              poff = off._data; pfoff = foff._data;
              cimg_forC(resc,c) {
                const float t = *(pfoff++);
                const Tfloat
                  val1 = (Tfloat)*ptrs,
                  val0 = ptrs>ptrs0?(Tfloat)*(ptrs-sxyz):val1,
                  val2 = ptrs<=ptrsmax?(Tfloat)*(ptrs+sxyz):val1,
                  val3 = ptrs<ptrsmax?(Tfloat)*(ptrs+2*sxyz):val2,
                  val = val1 + 0.5f*(t*(-val0+val2) + t*t*(2*val0-5*val1+4*val2-val3) + t*t*t*(-val0+3*val1-3*val2+val3));
                *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
                ptrd+=sxyz;
                ptrs+=*(poff++);
              }
            }
          }
          resz.assign();
        } else resc.assign(resz,true);

        return resc._is_shared?(resz._is_shared?(resy._is_shared?(resx._is_shared?(+(*this)):resx):resy):resz):resc;
      } break;

        // Lanczos interpolation.
        //
      case 6 : {
        const Tfloat vmin = (Tfloat)cimg::type<T>::min(), vmax = (Tfloat)cimg::type<T>::max();
        CImg<uintT> off(cimg::max(sx,sy,sz,sc));
        CImg<floatT> foff(off._width);
        unsigned int *poff;
        float *pfoff, old, curr;
        CImg<T> resx, resy, resz, resc;
        T *ptrd;

        if (sx!=_width) {
          if (_width==1) get_resize(sx,_height,_depth,_spectrum,1).move_to(resx);
          else {
            const float fx = (!border_conditions && sx>_width)?(sx>1?(_width-1.0f)/(sx-1):0):(float)_width/sx;
            resx.assign(sx,_height,_depth,_spectrum);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forX(resx,x) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fx; *(poff++) = (unsigned int)curr - (unsigned int)old; }
            ptrd = resx._data;
            const T *ptrs0 = _data;
            cimg_forYZC(resx,y,z,c) {
              poff = off._data; pfoff = foff._data;
              const T *ptrs = ptrs0, *const ptrsmin = ptrs0 + 1, *const ptrsmax = ptrs0 + (_width-2);
              cimg_forX(resx,x) {
                const float
                  t = *(pfoff++),
                  w0 = _cimg_lanczos(t+2),
                  w1 = _cimg_lanczos(t+1),
                  w2 = _cimg_lanczos(t),
                  w3 = _cimg_lanczos(t-1),
                  w4 = _cimg_lanczos(t-2);
                const Tfloat
                  val2 = (Tfloat)*ptrs,
                  val1 = ptrs>=ptrsmin?(Tfloat)*(ptrs-1):val2,
                  val0 = ptrs>ptrsmin?(Tfloat)*(ptrs-2):val1,
                  val3 = ptrs<=ptrsmax?(Tfloat)*(ptrs+1):val2,
                  val4 = ptrs<ptrsmax?(Tfloat)*(ptrs+2):val3,
                  val = (val0*w0 + val1*w1 + val2*w2 + val3*w3 + val4*w4)/(w1 + w2 + w3 + w4);
                *(ptrd++) = (T)(val<vmin?vmin:val>vmax?vmax:val);
                ptrs+=*(poff++);
              }
              ptrs0+=_width;
            }
          }
        } else resx.assign(*this,true);

        if (sy!=_height) {
          if (_height==1) resx.get_resize(sx,sy,_depth,_spectrum,1).move_to(resy);
          else {
            const float fy = (!border_conditions && sy>_height)?(sy>1?(_height-1.0f)/(sy-1):0):(float)_height/sy;
            resy.assign(sx,sy,_depth,_spectrum);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forY(resy,y) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fy; *(poff++) = sx*((unsigned int)curr-(unsigned int)old); }
            cimg_forXZC(resy,x,z,c) {
              ptrd = resy.data(x,0,z,c);
              const T *const ptrs0 = resx.data(x,0,z,c), *ptrs = ptrs0, *const ptrsmin = ptrs0 + sx, *const ptrsmax = ptrs0 + (_height-2)*sx;
              poff = off._data; pfoff = foff._data;
              cimg_forY(resy,y) {
                const float
                  t = *(pfoff++),
                  w0 = _cimg_lanczos(t+2),
                  w1 = _cimg_lanczos(t+1),
                  w2 = _cimg_lanczos(t),
                  w3 = _cimg_lanczos(t-1),
                  w4 = _cimg_lanczos(t-2);
                const Tfloat
                  val2 = (Tfloat)*ptrs,
                  val1 = ptrs>=ptrsmin?(Tfloat)*(ptrs-sx):val2,
                  val0 = ptrs>ptrsmin?(Tfloat)*(ptrs-2*sx):val1,
                  val3 = ptrs<=ptrsmax?(Tfloat)*(ptrs+sx):val2,
                  val4 = ptrs<ptrsmax?(Tfloat)*(ptrs+2*sx):val3,
                  val = (val0*w0 + val1*w1 + val2*w2 + val3*w3 + val4*w4)/(w1 + w2 + w3 + w4);
                *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
                ptrd+=sx;
                ptrs+=*(poff++);
              }
            }
          }
          resx.assign();
        } else resy.assign(resx,true);

        if (sz!=_depth) {
          if (_depth==1) resy.get_resize(sx,sy,sz,_spectrum,1).move_to(resz);
          else {
            const float fz = (!border_conditions && sz>_depth)?(sz>1?(_depth-1.0f)/(sz-1):0):(float)_depth/sz;
            const unsigned int sxy = sx*sy;
            resz.assign(sx,sy,sz,_spectrum);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forZ(resz,z) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fz; *(poff++) = sxy*((unsigned int)curr - (unsigned int)old); }
            cimg_forXYC(resz,x,y,c) {
              ptrd = resz.data(x,y,0,c);
              const T *const ptrs0 = resy.data(x,y,0,c), *ptrs = ptrs0, *const ptrsmin = ptrs0 + sxy, *const ptrsmax = ptrs0 + (_depth-2)*sxy;
              poff = off._data; pfoff = foff._data;
              cimg_forZ(resz,z) {
                const float
                  t = *(pfoff++),
                  w0 = _cimg_lanczos(t+2),
                  w1 = _cimg_lanczos(t+1),
                  w2 = _cimg_lanczos(t),
                  w3 = _cimg_lanczos(t-1),
                  w4 = _cimg_lanczos(t-2);
                const Tfloat
                  val2 = (Tfloat)*ptrs,
                  val1 = ptrs>=ptrsmin?(Tfloat)*(ptrs-sxy):val2,
                  val0 = ptrs>ptrsmin?(Tfloat)*(ptrs-2*sxy):val1,
                  val3 = ptrs<=ptrsmax?(Tfloat)*(ptrs+sxy):val2,
                  val4 = ptrs<ptrsmax?(Tfloat)*(ptrs+2*sxy):val3,
                  val = (val0*w0 + val1*w1 + val2*w2 + val3*w3 + val4*w4)/(w1 + w2 + w3 + w4);
                *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
                ptrd+=sxy;
                ptrs+=*(poff++);
              }
            }
          }
          resy.assign();
        } else resz.assign(resy,true);

        if (sc!=_spectrum) {
          if (_spectrum==1) resz.get_resize(sx,sy,sz,sc,1).move_to(resc);
          else {
            const float fc = (!border_conditions && sc>_spectrum)?(sc>1?(_spectrum-1.0f)/(sc-1):0):(float)_spectrum/sc;
            const unsigned int sxyz = sx*sy*sz;
            resc.assign(sx,sy,sz,sc);
            curr = old = 0; poff = off._data; pfoff = foff._data;
            cimg_forC(resc,c) { *(pfoff++) = curr - (unsigned int)curr; old = curr; curr+=fc; *(poff++) = sxyz*((unsigned int)curr - (unsigned int)old); }
            cimg_forXYZ(resc,x,y,z) {
              ptrd = resc.data(x,y,z,0);
              const T *const ptrs0 = resz.data(x,y,z,0), *ptrs = ptrs0, *const ptrsmin = ptrs0 + sxyz, *const ptrsmax = ptrs + (_spectrum-2)*sxyz;
              poff = off._data; pfoff = foff._data;
              cimg_forC(resc,c) {
                const float
                  t = *(pfoff++),
                  w0 = _cimg_lanczos(t+2),
                  w1 = _cimg_lanczos(t+1),
                  w2 = _cimg_lanczos(t),
                  w3 = _cimg_lanczos(t-1),
                  w4 = _cimg_lanczos(t-2);
                const Tfloat
                  val2 = (Tfloat)*ptrs,
                  val1 = ptrs>=ptrsmin?(Tfloat)*(ptrs-sxyz):val2,
                  val0 = ptrs>ptrsmin?(Tfloat)*(ptrs-2*sxyz):val1,
                  val3 = ptrs<=ptrsmax?(Tfloat)*(ptrs+sxyz):val2,
                  val4 = ptrs<ptrsmax?(Tfloat)*(ptrs+2*sxyz):val3,
                  val = (val0*w0 + val1*w1 + val2*w2 + val3*w3 + val4*w4)/(w1 + w2 + w3 + w4);
                *ptrd = (T)(val<vmin?vmin:val>vmax?vmax:val);
                ptrd+=sxyz;
                ptrs+=*(poff++);
              }
            }
          }
          resz.assign();
        } else resc.assign(resz,true);

        return resc._is_shared?(resz._is_shared?(resy._is_shared?(resx._is_shared?(+(*this)):resx):resy):resz):resc;
      } break;

        // Unknow interpolation.
        //
      default :
        throw CImgArgumentException(_cimg_instance
                                    "resize() : Invalid specified interpolation %d "
                                    "(should be { -1=raw | 0=none | 1=nearest | 2=average | 3=linear | 4=grid | 5=bicubic | 6=lanczos }).",
                                    cimg_instance,
                                    interpolation_type);
      }
      return res;
    }

    //! Resize an image.
    template<typename t>
    CImg<T>& resize(const CImg<t>& src,
                    const int interpolation_type=1, const unsigned int border_conditions=0,
                    const float centering_x = 0, const float centering_y = 0,
                    const float centering_z = 0, const float centering_c = 0) {
      return resize(src._width,src._height,src._depth,src._spectrum,interpolation_type,border_conditions,
                    centering_x,centering_y,centering_z,centering_c);
    }

    template<typename t>
    CImg<T> get_resize(const CImg<t>& src,
                       const int interpolation_type=1, const unsigned int border_conditions=0,
                       const float centering_x = 0, const float centering_y = 0,
                       const float centering_z = 0, const float centering_c = 0) const {
      return get_resize(src._width,src._height,src._depth,src._spectrum,interpolation_type,border_conditions,
                        centering_x,centering_y,centering_z,centering_c);
    }

    //! Resize an image.
    CImg<T>& resize(const CImgDisplay& disp,
                    const int interpolation_type=1, const unsigned int border_conditions=0,
                    const float centering_x = 0, const float centering_y = 0,
                    const float centering_z = 0, const float centering_c = 0) {
      return resize(disp.width(),disp.height(),_depth,_spectrum,interpolation_type,border_conditions,
                    centering_x,centering_y,centering_z,centering_c);
    }

    CImg<T> get_resize(const CImgDisplay& disp,
                       const int interpolation_type=1, const unsigned int border_conditions=0,
                       const float centering_x = 0, const float centering_y = 0,
                       const float centering_z = 0, const float centering_c = 0) const {
      return get_resize(disp.width(),disp.height(),_depth,_spectrum,interpolation_type,border_conditions,
                        centering_x,centering_y,centering_z,centering_c);
    }

    //! Half-resize an image, using a special optimized filter.
    CImg<T>& resize_halfXY() {
      return get_resize_halfXY().move_to(*this);
    }

    CImg<T> get_resize_halfXY() const {
      if (is_empty()) return *this;
      const Tfloat mask[9] = { 0.07842776544f, 0.1231940459f, 0.07842776544f,
                              0.1231940459f,  0.1935127547f, 0.1231940459f,
                              0.07842776544f, 0.1231940459f, 0.07842776544f };
      T I[9] = { 0 };
      CImg<T> res(_width/2,_height/2,_depth,_spectrum);
      T *ptrd = res._data;
      cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,T)
        if (x%2 && y%2) *(ptrd++) = (T)
                          (I[0]*mask[0] + I[1]*mask[1] + I[2]*mask[2] +
                           I[3]*mask[3] + I[4]*mask[4] + I[5]*mask[5] +
                           I[6]*mask[6] + I[7]*mask[7] + I[8]*mask[8]);
      return res;
    }

    //! Upscale an image by a factor 2x.
    /**
       Use anisotropic upscaling algorithm described at
       http://scale2x.sourceforge.net/algorithm.html
    **/
    CImg<T>& resize_doubleXY() {
      return get_resize_doubleXY().move_to(*this);
    }

    CImg<T> get_resize_doubleXY() const {
#define _cimg_gs2x_for3(bound,i) \
 for (int i = 0, _p1##i = 0, \
      _n1##i = 1>=(bound)?(int)(bound)-1:1; \
      _n1##i<(int)(bound) || i==--_n1##i; \
      _p1##i = i++, ++_n1##i, ptrd1+=(res)._width, ptrd2+=(res)._width)

#define _cimg_gs2x_for3x3(img,x,y,z,c,I,T) \
  _cimg_gs2x_for3((img)._height,y) for (int x = 0, \
   _p1##x = 0, \
   _n1##x = (int)( \
   (I[1] = (T)(img)(0,_p1##y,z,c)), \
   (I[3] = I[4] = (T)(img)(0,y,z,c)), \
   (I[7] = (T)(img)(0,_n1##y,z,c)),     \
   1>=(img)._width?(img).width()-1:1); \
   (_n1##x<(img).width() && ( \
   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[5] = (T)(img)(_n1##x,y,z,c)), \
   (I[8] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
   x==--_n1##x; \
   I[1] = I[2], \
   I[3] = I[4], I[4] = I[5], \
   I[7] = I[8], \
   _p1##x = x++, ++_n1##x)

      if (is_empty()) return *this;
      CImg<T> res(_width<<1,_height<<1,_depth,_spectrum);
      CImg_3x3(I,T);
      cimg_forZC(*this,z,c) {
        T
          *ptrd1 = res.data(0,0,z,c),
          *ptrd2 = ptrd1 + res._width;
        _cimg_gs2x_for3x3(*this,x,y,z,c,I,T) {
          if (Icp!=Icn && Ipc!=Inc) {
            *(ptrd1++) = Ipc==Icp?Ipc:Icc;
            *(ptrd1++) = Icp==Inc?Inc:Icc;
            *(ptrd2++) = Ipc==Icn?Ipc:Icc;
            *(ptrd2++) = Icn==Inc?Inc:Icc;
          } else { *(ptrd1++) = Icc; *(ptrd1++) = Icc; *(ptrd2++) = Icc; *(ptrd2++) = Icc; }
        }
      }
      return res;
    }

    //! Upscale an image by a factor 3x.
    /**
       Use anisotropic upscaling algorithm described at
       http://scale2x.sourceforge.net/algorithm.html
    **/
    CImg<T>& resize_tripleXY() {
      return get_resize_tripleXY().move_to(*this);
    }

    CImg<T> get_resize_tripleXY() const {
#define _cimg_gs3x_for3(bound,i) \
 for (int i = 0, _p1##i = 0, \
      _n1##i = 1>=(bound)?(int)(bound)-1:1; \
      _n1##i<(int)(bound) || i==--_n1##i; \
      _p1##i = i++, ++_n1##i, ptrd1+=2*(res)._width, ptrd2+=2*(res)._width, ptrd3+=2*(res)._width)

#define _cimg_gs3x_for3x3(img,x,y,z,c,I,T) \
  _cimg_gs3x_for3((img)._height,y) for (int x = 0, \
   _p1##x = 0, \
   _n1##x = (int)( \
   (I[0] = I[1] = (T)(img)(0,_p1##y,z,c)), \
   (I[3] = I[4] = (T)(img)(0,y,z,c)), \
   (I[6] = I[7] = (T)(img)(0,_n1##y,z,c)),      \
   1>=(img)._width?(img).width()-1:1); \
   (_n1##x<(img).width() && ( \
   (I[2] = (T)(img)(_n1##x,_p1##y,z,c)), \
   (I[5] = (T)(img)(_n1##x,y,z,c)), \
   (I[8] = (T)(img)(_n1##x,_n1##y,z,c)),1)) || \
   x==--_n1##x; \
   I[0] = I[1], I[1] = I[2], \
   I[3] = I[4], I[4] = I[5], \
   I[6] = I[7], I[7] = I[8], \
   _p1##x = x++, ++_n1##x)

      if (is_empty()) return *this;
      CImg<T> res(3*_width,3*_height,_depth,_spectrum);
      CImg_3x3(I,T);
      cimg_forZC(*this,z,c) {
        T
          *ptrd1 = res.data(0,0,z,c),
          *ptrd2 = ptrd1 + res._width,
          *ptrd3 = ptrd2 + res._width;
        _cimg_gs3x_for3x3(*this,x,y,z,c,I,T) {
          if (Icp != Icn && Ipc != Inc) {
            *(ptrd1++) = Ipc==Icp?Ipc:Icc;
            *(ptrd1++) = (Ipc==Icp && Icc!=Inp) || (Icp==Inc && Icc!=Ipp)?Icp:Icc;
            *(ptrd1++) = Icp==Inc?Inc:Icc;
            *(ptrd2++) = (Ipc==Icp && Icc!=Ipn) || (Ipc==Icn && Icc!=Ipp)?Ipc:Icc;
            *(ptrd2++) = Icc;
            *(ptrd2++) = (Icp==Inc && Icc!=Inn) || (Icn==Inc && Icc!=Inp)?Inc:Icc;
            *(ptrd3++) = Ipc==Icn?Ipc:Icc;
            *(ptrd3++) = (Ipc==Icn && Icc!=Inn) || (Icn==Inc && Icc!=Ipn)?Icn:Icc;
            *(ptrd3++) = Icn==Inc?Inc:Icc;
          } else {
            *(ptrd1++) = Icc; *(ptrd1++) = Icc; *(ptrd1++) = Icc;
            *(ptrd2++) = Icc; *(ptrd2++) = Icc; *(ptrd2++) = Icc;
            *(ptrd3++) = Icc; *(ptrd3++) = Icc; *(ptrd3++) = Icc;
          }
        }
      }
      return res;
    }

    //! Mirror an image along the specified axis.
    CImg<T>& mirror(const char axis) {
      if (is_empty()) return *this;
      T *pf, *pb, *buf = 0;
      switch (cimg::uncase(axis)) {
      case 'x' : {
        pf = _data; pb = data(_width-1);
        const unsigned int width2 = _width/2;
        for (unsigned int yzv = 0; yzv<_height*_depth*_spectrum; ++yzv) {
          for (unsigned int x = 0; x<width2; ++x) { const T val = *pf; *(pf++) = *pb; *(pb--) = val; }
          pf+=_width - width2;
          pb+=_width + width2;
        }
      } break;
      case 'y' : {
        buf = new T[_width];
        pf = _data; pb = data(0,_height-1);
        const unsigned int height2 = _height/2;
        for (unsigned int zv = 0; zv<_depth*_spectrum; ++zv) {
          for (unsigned int y = 0; y<height2; ++y) {
            std::memcpy(buf,pf,_width*sizeof(T));
            std::memcpy(pf,pb,_width*sizeof(T));
            std::memcpy(pb,buf,_width*sizeof(T));
            pf+=_width;
            pb-=_width;
          }
          pf+=_width*(_height - height2);
          pb+=_width*(_height + height2);
        }
      } break;
      case 'z' : {
        buf = new T[_width*_height];
        pf = _data; pb = data(0,0,_depth-1);
        const unsigned int depth2 = _depth/2;
        cimg_forC(*this,c) {
          for (unsigned int z = 0; z<depth2; ++z) {
            std::memcpy(buf,pf,_width*_height*sizeof(T));
            std::memcpy(pf,pb,_width*_height*sizeof(T));
            std::memcpy(pb,buf,_width*_height*sizeof(T));
            pf+=_width*_height;
            pb-=_width*_height;
          }
          pf+=_width*_height*(_depth - depth2);
          pb+=_width*_height*(_depth + depth2);
        }
      } break;
      default : {
        buf = new T[_width*_height*_depth];
        pf = _data; pb = data(0,0,0,_spectrum-1);
        const unsigned int _spectrum2 = _spectrum/2;
        for (unsigned int v = 0; v<_spectrum2; ++v) {
          std::memcpy(buf,pf,_width*_height*_depth*sizeof(T));
          std::memcpy(pf,pb,_width*_height*_depth*sizeof(T));
          std::memcpy(pb,buf,_width*_height*_depth*sizeof(T));
          pf+=_width*_height*_depth;
          pb-=_width*_height*_depth;
        }
      }
      }
      delete[] buf;
      return *this;
    }

    CImg<T> get_mirror(const char axis) const {
      return (+*this).mirror(axis);
    }

    //! Shift the image.
    /**
       \param deltax Amount of displacement along the X-axis.
       \param deltay Amount of displacement along the Y-axis.
       \param deltaz Amount of displacement along the Z-axis.
       \param deltac Amount of displacement along the C-axis.
       \param border_condition Border condition.

       - \c border_condition can be :
          - 0 : Zero border condition (Dirichlet).
          - 1 : Nearest neighbors (Neumann).
          - 2 : Repeat Pattern (Fourier style).
    **/
    CImg<T>& shift(const int deltax, const int deltay=0, const int deltaz=0, const int deltac=0,
                   const int border_condition=0) {
      if (is_empty()) return *this;
      if (deltax) // Shift along X-axis
        switch (border_condition) {
        case 0 :
          if (cimg::abs(deltax)>=width()) return fill(0);
          if (deltax<0) cimg_forYZC(*this,y,z,c) {
            std::memmove(data(0,y,z,c),data(-deltax,y,z,c),(_width+deltax)*sizeof(T));
            std::memset(data(_width+deltax,y,z,c),0,-deltax*sizeof(T));
          } else cimg_forYZC(*this,y,z,c) {
            std::memmove(data(deltax,y,z,c),data(0,y,z,c),(_width-deltax)*sizeof(T));
            std::memset(data(0,y,z,c),0,deltax*sizeof(T));
          }
          break;
        case 1 :
          if (deltax<0) {
            const int ndeltax = (-deltax>=width())?_width-1:-deltax;
            if (!ndeltax) return *this;
            cimg_forYZC(*this,y,z,c) {
              std::memmove(data(0,y,z,c),data(ndeltax,y,z,c),(_width-ndeltax)*sizeof(T));
              T *ptrd = data(_width-1,y,z,c);
              const T val = *ptrd;
              for (int l = 0; l<ndeltax-1; ++l) *(--ptrd) = val;
            }
          } else {
            const int ndeltax = (deltax>=width())?_width-1:deltax;
            if (!ndeltax) return *this;
            cimg_forYZC(*this,y,z,c) {
              std::memmove(data(ndeltax,y,z,c),data(0,y,z,c),(_width-ndeltax)*sizeof(T));
              T *ptrd = data(0,y,z,c);
              const T val = *ptrd;
              for (int l = 0; l<ndeltax-1; ++l) *(++ptrd) = val;
            }
          }
          break;
        default : {
          const int ml = cimg::mod(-deltax,width()), ndeltax = (ml<=width()/2)?ml:(ml-width());
          if (!ndeltax) return *this;
          T *const buf = new T[cimg::abs(ndeltax)];
          if (ndeltax>0) cimg_forYZC(*this,y,z,c) {
            std::memcpy(buf,data(0,y,z,c),ndeltax*sizeof(T));
            std::memmove(data(0,y,z,c),data(ndeltax,y,z,c),(_width-ndeltax)*sizeof(T));
            std::memcpy(data(_width-ndeltax,y,z,c),buf,ndeltax*sizeof(T));
          } else cimg_forYZC(*this,y,z,c) {
            std::memcpy(buf,data(_width+ndeltax,y,z,c),-ndeltax*sizeof(T));
            std::memmove(data(-ndeltax,y,z,c),data(0,y,z,c),(_width+ndeltax)*sizeof(T));
            std::memcpy(data(0,y,z,c),buf,-ndeltax*sizeof(T));
          }
          delete[] buf;
        }
        }

      if (deltay) // Shift along Y-axis
        switch (border_condition) {
        case 0 :
          if (cimg::abs(deltay)>=height()) return fill(0);
          if (deltay<0) cimg_forZC(*this,z,c) {
            std::memmove(data(0,0,z,c),data(0,-deltay,z,c),_width*(_height+deltay)*sizeof(T));
            std::memset(data(0,_height+deltay,z,c),0,-deltay*_width*sizeof(T));
          } else cimg_forZC(*this,z,c) {
            std::memmove(data(0,deltay,z,c),data(0,0,z,c),_width*(_height-deltay)*sizeof(T));
            std::memset(data(0,0,z,c),0,deltay*_width*sizeof(T));
          }
          break;
        case 1 :
          if (deltay<0) {
            const int ndeltay = (-deltay>=height())?_height-1:-deltay;
            if (!ndeltay) return *this;
            cimg_forZC(*this,z,c) {
              std::memmove(data(0,0,z,c),data(0,ndeltay,z,c),_width*(_height-ndeltay)*sizeof(T));
              T *ptrd = data(0,_height-ndeltay,z,c), *ptrs = data(0,_height-1,z,c);
              for (int l = 0; l<ndeltay-1; ++l) { std::memcpy(ptrd,ptrs,_width*sizeof(T)); ptrd+=_width; }
            }
          } else {
            const int ndeltay = (deltay>=height())?_height-1:deltay;
            if (!ndeltay) return *this;
            cimg_forZC(*this,z,c) {
              std::memmove(data(0,ndeltay,z,c),data(0,0,z,c),_width*(_height-ndeltay)*sizeof(T));
              T *ptrd = data(0,1,z,c), *ptrs = data(0,0,z,c);
              for (int l = 0; l<ndeltay-1; ++l) { std::memcpy(ptrd,ptrs,_width*sizeof(T)); ptrd+=_width; }
            }
          }
          break;
        default : {
          const int ml = cimg::mod(-deltay,height()), ndeltay = (ml<=height()/2)?ml:(ml-height());
          if (!ndeltay) return *this;
          T *const buf = new T[_width*cimg::abs(ndeltay)];
          if (ndeltay>0) cimg_forZC(*this,z,c) {
            std::memcpy(buf,data(0,0,z,c),_width*ndeltay*sizeof(T));
            std::memmove(data(0,0,z,c),data(0,ndeltay,z,c),_width*(_height-ndeltay)*sizeof(T));
            std::memcpy(data(0,_height-ndeltay,z,c),buf,_width*ndeltay*sizeof(T));
          } else cimg_forZC(*this,z,c) {
            std::memcpy(buf,data(0,_height+ndeltay,z,c),-ndeltay*_width*sizeof(T));
            std::memmove(data(0,-ndeltay,z,c),data(0,0,z,c),_width*(_height+ndeltay)*sizeof(T));
            std::memcpy(data(0,0,z,c),buf,-ndeltay*_width*sizeof(T));
          }
          delete[] buf;
        }
        }

      if (deltaz) // Shift along Z-axis
        switch (border_condition) {
        case 0 :
          if (cimg::abs(deltaz)>=depth()) return fill(0);
          if (deltaz<0) cimg_forC(*this,c) {
            std::memmove(data(0,0,0,c),data(0,0,-deltaz,c),_width*_height*(_depth+deltaz)*sizeof(T));
            std::memset(data(0,0,_depth+deltaz,c),0,_width*_height*(-deltaz)*sizeof(T));
          } else cimg_forC(*this,c) {
            std::memmove(data(0,0,deltaz,c),data(0,0,0,c),_width*_height*(_depth-deltaz)*sizeof(T));
            std::memset(data(0,0,0,c),0,deltaz*_width*_height*sizeof(T));
          }
          break;
        case 1 :
          if (deltaz<0) {
            const int ndeltaz = (-deltaz>=depth())?_depth-1:-deltaz;
            if (!ndeltaz) return *this;
            cimg_forC(*this,c) {
              std::memmove(data(0,0,0,c),data(0,0,ndeltaz,c),_width*_height*(_depth-ndeltaz)*sizeof(T));
              T *ptrd = data(0,0,_depth-ndeltaz,c), *ptrs = data(0,0,_depth-1,c);
              for (int l = 0; l<ndeltaz-1; ++l) { std::memcpy(ptrd,ptrs,_width*_height*sizeof(T)); ptrd+=_width*_height; }
            }
          } else {
            const int ndeltaz = (deltaz>=depth())?_depth-1:deltaz;
            if (!ndeltaz) return *this;
            cimg_forC(*this,c) {
              std::memmove(data(0,0,ndeltaz,c),data(0,0,0,c),_width*_height*(_depth-ndeltaz)*sizeof(T));
              T *ptrd = data(0,0,1,c), *ptrs = data(0,0,0,c);
              for (int l = 0; l<ndeltaz-1; ++l) { std::memcpy(ptrd,ptrs,_width*_height*sizeof(T)); ptrd+=_width*_height; }
            }
          }
          break;
        default : {
          const int ml = cimg::mod(-deltaz,depth()), ndeltaz = (ml<=depth()/2)?ml:(ml-depth());
          if (!ndeltaz) return *this;
          T *const buf = new T[_width*_height*cimg::abs(ndeltaz)];
          if (ndeltaz>0) cimg_forC(*this,c) {
            std::memcpy(buf,data(0,0,0,c),_width*_height*ndeltaz*sizeof(T));
            std::memmove(data(0,0,0,c),data(0,0,ndeltaz,c),_width*_height*(_depth-ndeltaz)*sizeof(T));
            std::memcpy(data(0,0,_depth-ndeltaz,c),buf,_width*_height*ndeltaz*sizeof(T));
          } else cimg_forC(*this,c) {
            std::memcpy(buf,data(0,0,_depth+ndeltaz,c),-ndeltaz*_width*_height*sizeof(T));
            std::memmove(data(0,0,-ndeltaz,c),data(0,0,0,c),_width*_height*(_depth+ndeltaz)*sizeof(T));
            std::memcpy(data(0,0,0,c),buf,-ndeltaz*_width*_height*sizeof(T));
          }
          delete[] buf;
        }
        }

      if (deltac) // Shift along C-axis
        switch (border_condition) {
        case 0 :
          if (cimg::abs(deltac)>=spectrum()) return fill(0);
          if (deltac<0) {
            std::memmove(_data,data(0,0,0,-deltac),_width*_height*_depth*(_spectrum+deltac)*sizeof(T));
            std::memset(data(0,0,0,_spectrum+deltac),0,_width*_height*_depth*(-deltac)*sizeof(T));
          } else {
            std::memmove(data(0,0,0,deltac),_data,_width*_height*_depth*(_spectrum-deltac)*sizeof(T));
            std::memset(_data,0,deltac*_width*_height*_depth*sizeof(T));
          }
          break;
        case 1 :
          if (deltac<0) {
            const int ndeltac = (-deltac>=spectrum())?_spectrum-1:-deltac;
            if (!ndeltac) return *this;
            std::memmove(_data,data(0,0,0,ndeltac),_width*_height*_depth*(_spectrum-ndeltac)*sizeof(T));
            T *ptrd = data(0,0,0,_spectrum-ndeltac), *ptrs = data(0,0,0,_spectrum-1);
            for (int l = 0; l<ndeltac-1; ++l) { std::memcpy(ptrd,ptrs,_width*_height*_depth*sizeof(T)); ptrd+=_width*_height*_depth; }
          } else {
            const int ndeltac = (deltac>=spectrum())?_spectrum-1:deltac;
            if (!ndeltac) return *this;
            std::memmove(data(0,0,0,ndeltac),_data,_width*_height*_depth*(_spectrum-ndeltac)*sizeof(T));
            T *ptrd = data(0,0,0,1);
            for (int l = 0; l<ndeltac-1; ++l) { std::memcpy(ptrd,_data,_width*_height*_depth*sizeof(T)); ptrd+=_width*_height*_depth; }
          }
          break;
        default : {
          const int ml = cimg::mod(-deltac,spectrum()), ndeltac = (ml<=spectrum()/2)?ml:(ml-spectrum());
          if (!ndeltac) return *this;
          T *const buf = new T[_width*_height*_depth*cimg::abs(ndeltac)];
          if (ndeltac>0) {
            std::memcpy(buf,_data,_width*_height*_depth*ndeltac*sizeof(T));
            std::memmove(_data,data(0,0,0,ndeltac),_width*_height*_depth*(_spectrum-ndeltac)*sizeof(T));
            std::memcpy(data(0,0,0,_spectrum-ndeltac),buf,_width*_height*_depth*ndeltac*sizeof(T));
          } else {
            std::memcpy(buf,data(0,0,0,_spectrum+ndeltac),-ndeltac*_width*_height*_depth*sizeof(T));
            std::memmove(data(0,0,0,-ndeltac),_data,_width*_height*_depth*(_spectrum+ndeltac)*sizeof(T));
            std::memcpy(_data,buf,-ndeltac*_width*_height*_depth*sizeof(T));
          }
          delete[] buf;
        }
        }
      return *this;
    }

    CImg<T> get_shift(const int deltax, const int deltay=0, const int deltaz=0, const int deltac=0,
                          const int border_condition=0) const {
      return (+*this).shift(deltax,deltay,deltaz,deltac,border_condition);
    }

    // Permute axes order (internal).
    template<typename t>
    CImg<t> _get_permute_axes(const char *const permut, const t&) const {
      if (is_empty() || !permut) return CImg<t>(*this,false);
      CImg<t> res;
      const T* ptrs = _data;
      if (!cimg::strncasecmp(permut,"xyzc",4)) return (+*this);
      if (!cimg::strncasecmp(permut,"xycz",4)) {
        res.assign(_width,_height,_spectrum,_depth);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(x,y,c,z,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"xzyc",4)) {
        res.assign(_width,_depth,_height,_spectrum);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(x,z,y,c,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"xzcy",4)) {
        res.assign(_width,_depth,_spectrum,_height);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(x,z,c,y,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"xcyz",4)) {
        res.assign(_width,_spectrum,_height,_depth);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(x,c,y,z,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"xczy",4)) {
        res.assign(_width,_spectrum,_depth,_height);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(x,c,z,y,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"yxzc",4)) {
        res.assign(_height,_width,_depth,_spectrum);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(y,x,z,c,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"yxcz",4)) {
        res.assign(_height,_width,_spectrum,_depth);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(y,x,c,z,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"yzxc",4)) {
        res.assign(_height,_depth,_width,_spectrum);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(y,z,x,c,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"yzcx",4)) {
        res.assign(_height,_depth,_spectrum,_width);
        switch (_width) {
        case 1 : {
          t *ptr_r = res.data(0,0,0,0);
          for (unsigned int siz = _height*_depth*_spectrum; siz; --siz) {
            *(ptr_r++) = (t)*(ptrs++);
          }
        } break;
        case 2 : {
          t *ptr_r = res.data(0,0,0,0), *ptr_g = res.data(0,0,0,1);
          for (unsigned int siz = _height*_depth*_spectrum; siz; --siz) {
            *(ptr_r++) = (t)*(ptrs++); *(ptr_g++) = (t)*(ptrs++);
          }
        } break;
        case 3 : { // Optimization for the classical conversion from interleaved RGB to planar RGB
          t *ptr_r = res.data(0,0,0,0), *ptr_g = res.data(0,0,0,1), *ptr_b = res.data(0,0,0,2);
          for (unsigned int siz = _height*_depth*_spectrum; siz; --siz) {
            *(ptr_r++) = (t)*(ptrs++); *(ptr_g++) = (t)*(ptrs++); *(ptr_b++) = (t)*(ptrs++);
          }
        } break;
        case 4 : { // Optimization for the classical conversion from interleaved RGBA to planar RGBA
          t *ptr_r = res.data(0,0,0,0), *ptr_g = res.data(0,0,0,1), *ptr_b = res.data(0,0,0,2), *ptr_a = res.data(0,0,0,3);
          for (unsigned int siz = _height*_depth*_spectrum; siz; --siz) {
            *(ptr_r++) = (t)*(ptrs++); *(ptr_g++) = (t)*(ptrs++); *(ptr_b++) = (t)*(ptrs++); *(ptr_a++) = (t)*(ptrs++);
          }
        } break;
        default : {
          const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
          cimg_forXYZC(*this,x,y,z,c) res(y,z,c,x,wh,whd) = *(ptrs++);
          return res;
        }
        }
      }
      if (!cimg::strncasecmp(permut,"ycxz",4)) {
        res.assign(_height,_spectrum,_width,_depth);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(y,c,x,z,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"yczx",4)) {
        res.assign(_height,_spectrum,_depth,_width);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(y,c,z,x,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"zxyc",4)) {
        res.assign(_depth,_width,_height,_spectrum);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(z,x,y,c,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"zxcy",4)) {
        res.assign(_depth,_width,_spectrum,_height);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(z,x,c,y,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"zyxc",4)) {
        res.assign(_depth,_height,_width,_spectrum);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(z,y,x,c,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"zycx",4)) {
        res.assign(_depth,_height,_spectrum,_width);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(z,y,c,x,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"zcxy",4)) {
        res.assign(_depth,_spectrum,_width,_height);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(z,c,x,y,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"zcyx",4)) {
        res.assign(_depth,_spectrum,_height,_width);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(z,c,y,x,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"cxyz",4)) {
        res.assign(_spectrum,_width,_height,_depth);
        switch (_spectrum) {
        case 1 : {
          const T *ptr_r = data(0,0,0,0);
          t *ptrd = res._data;
          for (unsigned int siz = _width*_height*_depth; siz; --siz) {
            *(ptrd++) = (t)*(ptr_r++);
          }
        } break;
        case 2 : {
          const T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1);
          t *ptrd = res._data;
          for (unsigned int siz = _width*_height*_depth; siz; --siz) {
            *(ptrd++) = (t)*(ptr_r++); *(ptrd++) = (t)*(ptr_g++);
          }
        } break;
        case 3 : { // Optimization for the classical conversion from planar RGB to interleaved RGB
          const T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
          t *ptrd = res._data;
          for (unsigned int siz = _width*_height*_depth; siz; --siz) {
            *(ptrd++) = (t)*(ptr_r++); *(ptrd++) = (t)*(ptr_g++); *(ptrd++) = (t)*(ptr_b++);
          }
        } break;
        case 4 : { // Optimization for the classical conversion from planar RGBA to interleaved RGBA
          const T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2), *ptr_a = data(0,0,0,3);
          t *ptrd = res._data;
          for (unsigned int siz = _width*_height*_depth; siz; --siz) {
            *(ptrd++) = (t)*(ptr_r++); *(ptrd++) = (t)*(ptr_g++); *(ptrd++) = (t)*(ptr_b++); *(ptrd++) = (t)*(ptr_a++);
          }
        } break;
        default : {
          const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
          cimg_forXYZC(*this,x,y,z,c) res(c,x,y,z,wh,whd) = (t)*(ptrs++);
        }
        }
      }
      if (!cimg::strncasecmp(permut,"cxzy",4)) {
        res.assign(_spectrum,_width,_depth,_height);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(c,x,z,y,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"cyxz",4)) {
        res.assign(_spectrum,_height,_width,_depth);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(c,y,x,z,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"cyzx",4)) {
        res.assign(_spectrum,_height,_depth,_width);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(c,y,z,x,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"czxy",4)) {
        res.assign(_spectrum,_depth,_width,_height);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(c,z,x,y,wh,whd) = (t)*(ptrs++);
      }
      if (!cimg::strncasecmp(permut,"czyx",4)) {
        res.assign(_spectrum,_depth,_height,_width);
        const unsigned long wh = (unsigned long)res._width*res._height, whd = wh*res._depth;
        cimg_forXYZC(*this,x,y,z,c) res(c,z,y,x,wh,whd) = (t)*(ptrs++);
      }
      if (!res)
        throw CImgArgumentException(_cimg_instance
                                    "permute_axes() : Invalid specified permutation '%s'.",
                                    cimg_instance,
                                    permut);
      return res;
    }

    //! Permute axes order.
    /**
       This function permutes image axes.
       \param permut = String describing the permutation (4 characters).
    **/
    CImg<T>& permute_axes(const char *const order) {
      return get_permute_axes(order).move_to(*this);
    }

    CImg<T> get_permute_axes(const char *const order) const {
      const T foo = (T)0;
      return _get_permute_axes(order,foo);
    }

    //! Unroll all images values into specified axis.
    CImg<T>& unroll(const char axis) {
      const unsigned int siz = size();
      if (siz) switch (axis) {
      case 'x' : _width = siz; _height = _depth = _spectrum = 1; break;
      case 'y' : _height = siz; _width = _depth = _spectrum = 1; break;
      case 'z' : _depth = siz; _width = _height = _spectrum = 1; break;
      default : _spectrum = siz; _width = _height = _depth = 1;
      }
      return *this;
    }

    CImg<T> get_unroll(const char axis) const {
      return (+*this).unroll(axis);
    }

    //! Rotate an image.
    /**
       \param angle = rotation angle (in degrees).
       \param cond = rotation type. can be :
       - 0 = zero-value at borders
       - 1 = nearest pixel.
       - 2 = cyclic.
       \note Returned image will probably have a different size than the instance image *this.
    **/
    CImg<T>& rotate(const float angle, const unsigned int border_conditions=0, const unsigned int interpolation=1) {
      return get_rotate(angle,border_conditions,interpolation).move_to(*this);
    }

    CImg<T> get_rotate(const float angle, const unsigned int border_conditions=0, const unsigned int interpolation=1) const {
      if (is_empty()) return *this;
      CImg<T> res;
      const float nangle = cimg::mod(angle,360.0f);
      if (border_conditions!=1 && cimg::mod(nangle,90.0f)==0) { // optimized version for orthogonal angles
        const int wm1 = width() - 1, hm1 = height() - 1;
        const int iangle = (int)nangle/90;
        switch (iangle) {
        case 1 : {
          res.assign(_height,_width,_depth,_spectrum);
          T *ptrd = res._data;
          cimg_forXYZC(res,x,y,z,c) *(ptrd++) = (*this)(y,hm1-x,z,c);
        } break;
        case 2 : {
          res.assign(_width,_height,_depth,_spectrum);
          T *ptrd = res._data;
          cimg_forXYZC(res,x,y,z,c) *(ptrd++) = (*this)(wm1-x,hm1-y,z,c);
        } break;
        case 3 : {
          res.assign(_height,_width,_depth,_spectrum);
          T *ptrd = res._data;
          cimg_forXYZC(res,x,y,z,c) *(ptrd++) = (*this)(wm1-y,x,z,c);
        } break;
        default :
          return *this;
        }
      } else { // generic version
        const Tfloat vmin = (Tfloat)cimg::type<T>::min(), vmax = (Tfloat)cimg::type<T>::max();
        const float
          rad = (float)(nangle*cimg::PI/180.0),
          ca = (float)std::cos(rad),
          sa = (float)std::sin(rad),
          ux = cimg::abs(_width*ca), uy = cimg::abs(_width*sa),
          vx = cimg::abs(_height*sa), vy = cimg::abs(_height*ca),
          w2 = 0.5f*_width, h2 = 0.5f*_height,
          dw2 = 0.5f*(ux+vx), dh2 = 0.5f*(uy+vy);
        res.assign((int)(ux+vx),(int)(uy+vy),_depth,_spectrum);
        switch (border_conditions) {
        case 0 : {
          switch (interpolation) {
          case 2 : {
            cimg_forXY(res,x,y) cimg_forZC(*this,z,c) {
              const Tfloat val = cubic_atXY(w2 + (x-dw2)*ca + (y-dh2)*sa,h2 - (x-dw2)*sa + (y-dh2)*ca,z,c,0);
              res(x,y,z,c) = (T)(val<vmin?vmin:val>vmax?vmax:val);
            }
          } break;
          case 1 : {
            cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
              res(x,y,z,c) = (T)linear_atXY(w2 + (x-dw2)*ca + (y-dh2)*sa,h2 - (x-dw2)*sa + (y-dh2)*ca,z,c,0);
          } break;
          default : {
            cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
              res(x,y,z,c) = atXY((int)(w2 + (x-dw2)*ca + (y-dh2)*sa),(int)(h2 - (x-dw2)*sa + (y-dh2)*ca),z,c,0);
          }
          }
        } break;
        case 1 : {
          switch (interpolation) {
          case 2 : {
            cimg_forXY(res,x,y) cimg_forZC(*this,z,c) {
              const Tfloat val = _cubic_atXY(w2 + (x-dw2)*ca + (y-dh2)*sa,h2 - (x-dw2)*sa + (y-dh2)*ca,z,c);
              res(x,y,z,c) = (T)(val<vmin?vmin:val>vmax?vmax:val);
            }
          } break;
          case 1 : {
            cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
              res(x,y,z,c) = (T)_linear_atXY(w2 + (x-dw2)*ca + (y-dh2)*sa,h2 - (x-dw2)*sa + (y-dh2)*ca,z,c);
          } break;
          default : {
            cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
              res(x,y,z,c) = _atXY((int)(w2 + (x-dw2)*ca + (y-dh2)*sa),(int)(h2 - (x-dw2)*sa + (y-dh2)*ca),z,c);
          }
          }
        } break;
        case 2 : {
          switch (interpolation) {
          case 2 : {
            cimg_forXY(res,x,y) cimg_forZC(*this,z,c) {
              const Tfloat val = _cubic_atXY(cimg::mod(w2 + (x-dw2)*ca + (y-dh2)*sa,(float)width()),
                                             cimg::mod(h2 - (x-dw2)*sa + (y-dh2)*ca,(float)height()),z,c);
              res(x,y,z,c) = (T)(val<vmin?vmin:val>vmax?vmax:val);
            }
          } break;
          case 1 : {
            cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
              res(x,y,z,c) = (T)_linear_atXY(cimg::mod(w2 + (x-dw2)*ca + (y-dh2)*sa,(float)width()),
                                             cimg::mod(h2 - (x-dw2)*sa + (y-dh2)*ca,(float)height()),z,c);
          } break;
          default : {
            cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
              res(x,y,z,c) = (*this)(cimg::mod((int)(w2 + (x-dw2)*ca + (y-dh2)*sa),width()),
                                      cimg::mod((int)(h2 - (x-dw2)*sa + (y-dh2)*ca),height()),z,c);
          }
          }
        } break;
        default :
          throw CImgArgumentException(_cimg_instance
                                      "rotate() : Invalid specified border conditions %d "
                                      "(should be { 0=dirichlet | 1=neumann | 2=cyclic }).",
                                      cimg_instance,
                                      border_conditions);
        }
      }
      return res;
    }

    //! Rotate an image around a center point (\c cx,\c cy).
    /**
       \param angle = rotation angle (in degrees).
       \param cx = X-coordinate of the rotation center.
       \param cy = Y-coordinate of the rotation center.
       \param zoom = zoom.
       \param cond = rotation type. can be :
       - 0 = zero-value at borders
       - 1 = repeat image at borders
       - 2 = zero-value at borders and linear interpolation
    **/
    CImg<T>& rotate(const float angle, const float cx, const float cy, const float zoom,
                    const unsigned int border_conditions=3, const unsigned int interpolation=1) {
      return get_rotate(angle,cx,cy,zoom,border_conditions,interpolation).move_to(*this);
    }

    CImg<T> get_rotate(const float angle, const float cx, const float cy, const float zoom,
                       const unsigned int border_conditions=3, const unsigned int interpolation=1) const {
      if (interpolation>2)
        throw CImgArgumentException(_cimg_instance
                                    "rotate() : Invalid specified interpolation %d "
                                    "(should be { 0=none | 1=linear | 2=bicubic }).",
                                    cimg_instance,
                                    interpolation);

      if (is_empty()) return *this;
      CImg<T> res(_width,_height,_depth,_spectrum);
      const Tfloat vmin = (Tfloat)cimg::type<T>::min(), vmax = (Tfloat)cimg::type<T>::max();
      const float
        rad = (float)((angle*cimg::PI)/180.0),
        ca = (float)std::cos(rad)/zoom,
        sa = (float)std::sin(rad)/zoom;
      switch (border_conditions) {
      case 0 : {
        switch (interpolation) {
        case 2 : {
          cimg_forXY(res,x,y) cimg_forZC(*this,z,c) {
            const Tfloat val = cubic_atXY(cx + (x-cx)*ca + (y-cy)*sa,cy - (x-cx)*sa + (y-cy)*ca,z,c,0);
            res(x,y,z,c) = (T)(val<vmin?vmin:val>vmax?vmax:val);
          }
        } break;
        case 1 : {
          cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
            res(x,y,z,c) = (T)linear_atXY(cx + (x-cx)*ca + (y-cy)*sa,cy - (x-cx)*sa + (y-cy)*ca,z,c,0);
        } break;
        default : {
          cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
            res(x,y,z,c) = atXY((int)(cx + (x-cx)*ca + (y-cy)*sa),(int)(cy - (x-cx)*sa + (y-cy)*ca),z,c,0);
        }
        }
      } break;
      case 1 : {
        switch (interpolation) {
        case 2 : {
          cimg_forXY(res,x,y) cimg_forZC(*this,z,c) {
            const Tfloat val = _cubic_atXY(cx + (x-cx)*ca + (y-cy)*sa,cy - (x-cx)*sa + (y-cy)*ca,z,c);
            res(x,y,z,c) = (T)(val<vmin?vmin:val>vmax?vmax:val);
          }
        } break;
        case 1 : {
          cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
            res(x,y,z,c) = (T)_linear_atXY(cx + (x-cx)*ca + (y-cy)*sa,cy - (x-cx)*sa + (y-cy)*ca,z,c);
        } break;
        default : {
          cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
            res(x,y,z,c) = _atXY((int)(cx + (x-cx)*ca + (y-cy)*sa),(int)(cy - (x-cx)*sa + (y-cy)*ca),z,c);
        }
        }
      } break;
      case 2 : {
        switch (interpolation) {
        case 2 : {
          cimg_forXY(res,x,y) cimg_forZC(*this,z,c) {
            const Tfloat val = _cubic_atXY(cimg::mod(cx + (x-cx)*ca + (y-cy)*sa,(float)width()),
                                           cimg::mod(cy - (x-cx)*sa + (y-cy)*ca,(float)height()),z,c);
            res(x,y,z,c) = (T)(val<vmin?vmin:val>vmax?vmax:val);
          }
        } break;
        case 1 : {
          cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
            res(x,y,z,c) = (T)_linear_atXY(cimg::mod(cx + (x-cx)*ca + (y-cy)*sa,(float)width()),
                                           cimg::mod(cy - (x-cx)*sa + (y-cy)*ca,(float)height()),z,c);
        } break;
        default : {
          cimg_forXY(res,x,y) cimg_forZC(*this,z,c)
            res(x,y,z,c) = (*this)(cimg::mod((int)(cx + (x-cx)*ca + (y-cy)*sa),width()),
                                    cimg::mod((int)(cy - (x-cx)*sa + (y-cy)*ca),height()),z,c);
        }
        }
      } break;
      default :
        throw CImgArgumentException(_cimg_instance
                                    "rotate() : Invalid specified border conditions %d "
                                    "(should be { 0=dirichlet | 1=neumann | 2=cyclic }).",
                                    cimg_instance,
                                    border_conditions);
      }
      return res;
    }

    //! Warp an image.
    template<typename t>
    CImg<T>& warp(const CImg<t>& warp, const bool is_relative=false,
                  const bool interpolation=true, const unsigned int border_conditions=0) {
      return get_warp(warp,is_relative,interpolation,border_conditions).move_to(*this);
    }

    template<typename t>
    CImg<T> get_warp(const CImg<t>& warp, const bool is_relative=false,
                     const bool interpolation=true, const unsigned int border_conditions=0) const {
      if (is_empty() || !warp) return *this;
      if (is_relative && !is_sameXYZ(warp))
        throw CImgArgumentException(_cimg_instance
                                    "warp() : Instance and specified relative warping field (%u,%u,%u,%u,%p) "
                                    "have different XYZ dimensions.",
                                    cimg_instance,
                                    warp._width,warp._height,warp._depth,warp._spectrum,warp._data);

      CImg<T> res(warp._width,warp._height,warp._depth,_spectrum);
      T *ptrd = res._data;
      switch (warp._spectrum) {
      case 1 : // 1d warping.
        if (is_relative) { // Relative warp coordinates
          if (interpolation) switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atX(cimg::mod(x - (float)*(ptrs0++),(float)_width),y,z,c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atX(x - (float)*(ptrs0++),y,z,c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)linear_atX(x - (float)*(ptrs0++),y,z,c,0);
              }
            }
            } else switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (*this)(cimg::mod(x - (int)*(ptrs0++),(int)_width),y,z,c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = _atX(x - (int)*(ptrs0++),y,z,c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = atX(x - (int)*(ptrs0++),y,z,c,0);
              }
            }
            }
        } else { // Absolute warp coordinates
          if (interpolation) switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atX(cimg::mod((float)*(ptrs0++),(float)_width),0,0,c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atX((float)*(ptrs0++),0,0,c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)linear_atX((float)*(ptrs0++),0,0,c,0);
              }
            }
            } else switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (*this)(cimg::mod((int)*(ptrs0++),(int)_width),0,0,c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = _atX((int)*(ptrs0++),0,0,c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp._data;
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = atX((int)*(ptrs0++),0,0,c,0);
              }
            }
            }
        }
        break;

      case 2 : // 2d warping
        if (is_relative) { // Relative warp coordinates
          if (interpolation) switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atXY(cimg::mod(x - (float)*(ptrs0++),(float)_width),
                                              cimg::mod(y - (float)*(ptrs1++),(float)_height),z,c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atXY(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z,c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)linear_atXY(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z,c,0);
              }
            }
            } else switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (*this)(cimg::mod(x - (int)*(ptrs0++),(int)_width),
                                      cimg::mod(y - (int)*(ptrs1++),(int)_height),z,c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = _atXY(x - (int)*(ptrs0++),y - (int)*(ptrs1++),z,c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = atXY(x - (int)*(ptrs0++),y - (int)*(ptrs1++),z,c,0);
              }
            }
            }
        } else { // Absolute warp coordinates
          if (interpolation) switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atXY(cimg::mod((float)*(ptrs0++),(float)_width),
                                              cimg::mod((float)*(ptrs1++),(float)_height),0,c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atXY((float)*(ptrs0++),(float)*(ptrs1++),0,c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)linear_atXY((float)*(ptrs0++),(float)*(ptrs1++),0,c,0);
              }
            }
            } else switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (*this)(cimg::mod((int)*(ptrs0++),(int)_width),
                                      cimg::mod((int)*(ptrs1++),(int)_height),0,c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = _atXY((int)*(ptrs0++),(int)*(ptrs1++),0,c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = atXY((int)*(ptrs0++),(int)*(ptrs1++),0,c,0);
              }
            }
            }
        }
        break;

      default : // 3d warping
        if (is_relative) { // Relative warp coordinates
          if (interpolation) switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atXYZ(cimg::mod(x - (float)*(ptrs0++),(float)_width),
                                               cimg::mod(y - (float)*(ptrs1++),(float)_height),
                                               cimg::mod(z - (float)*(ptrs2++),(float)_depth),c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atXYZ(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z - (float)*(ptrs2++),c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)linear_atXYZ(x - (float)*(ptrs0++),y - (float)*(ptrs1++),z - (float)*(ptrs2++),c,0);
              }
            }
            } else switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (*this)(cimg::mod(x - (int)*(ptrs0++),(int)_width),
                                      cimg::mod(y - (int)*(ptrs1++),(int)_height),
                                      cimg::mod(z - (int)*(ptrs2++),(int)_depth),c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = _atXYZ(x - (int)*(ptrs0++),y - (int)*(ptrs1++),z - (int)*(ptrs2++),c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = atXYZ(x - (int)*(ptrs0++),y - (int)*(ptrs1++),z - (int)*(ptrs2++),c,0);
              }
            }
            }
        } else { // Absolute warp coordinates
          if (interpolation) switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atXYZ(cimg::mod((float)*(ptrs0++),(float)_width),
                                               cimg::mod((float)*(ptrs1++),(float)_height),
                                               cimg::mod((float)*(ptrs2++),(float)_depth),c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)_linear_atXYZ((float)*(ptrs0++),(float)*(ptrs1++),(float)*(ptrs2++),c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (T)linear_atXYZ((float)*(ptrs0++),(float)*(ptrs1++),(float)*(ptrs2++),c,0);
              }
            }
            } else switch (border_conditions) {
            case 2 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = (*this)(cimg::mod((int)*(ptrs0++),(int)_width),
                                      cimg::mod((int)*(ptrs1++),(int)_height),
                                      cimg::mod((int)*(ptrs2++),(int)_depth),c);
              }
            } break;
            case 1 : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = _atXYZ((int)*(ptrs0++),(int)*(ptrs1++),(int)*(ptrs2++),c);
              }
            } break;
            default : {
              cimg_forC(res,c) {
                const t *ptrs0 = warp.data(0,0,0,0), *ptrs1 = warp.data(0,0,0,1), *ptrs2 = warp.data(0,0,0,2);
                cimg_forXYZ(res,x,y,z)
                  *(ptrd++) = atXYZ((int)*(ptrs0++),(int)*(ptrs1++),(int)*(ptrs2++),c,0);
              }
            }
            }
        }
      }
      return res;
    }

    //! Return a 2d representation of a 3d image, with three slices.
    CImg<T>& projections2d(const unsigned int x0, const unsigned int y0, const unsigned int z0) {
      if (_depth<2) return *this;
      return get_projections2d(x0,y0,z0).move_to(*this);
    }

    CImg<T> get_projections2d(const unsigned int x0, const unsigned int y0, const unsigned int z0) const {
      if (is_empty() || _depth<2) return +*this;
      const unsigned int
        _x0 = (x0>=_width)?_width - 1:x0,
        _y0 = (y0>=_height)?_height - 1:y0,
        _z0 = (z0>=_depth)?_depth - 1:z0;
      const CImg<T>
        img_xy = get_crop(0,0,_z0,0,_width-1,_height-1,_z0,_spectrum-1),
        img_zy = get_crop(_x0,0,0,0,_x0,_height-1,_depth-1,_spectrum-1).permute_axes("xzyc").resize(_depth,_height,1,-100,-1),
        img_xz = get_crop(0,_y0,0,0,_width-1,_y0,_depth-1,_spectrum-1).resize(_width,_depth,1,-100,-1);
      return CImg<T>(_width + _depth,_height + _depth,1,_spectrum,cimg::min(img_xy.min(),img_zy.min(),img_xz.min())).
        draw_image(0,0,img_xy).draw_image(img_xy._width,0,img_zy).
        draw_image(0,img_xy._height,img_xz);
    }

    //! Get a square region of the image.
    /**
       \param x0 = X-coordinate of the upper-left crop rectangle corner.
       \param y0 = Y-coordinate of the upper-left crop rectangle corner.
       \param z0 = Z-coordinate of the upper-left crop rectangle corner.
       \param c0 = C-coordinate of the upper-left crop rectangle corner.
       \param x1 = X-coordinate of the lower-right crop rectangle corner.
       \param y1 = Y-coordinate of the lower-right crop rectangle corner.
       \param z1 = Z-coordinate of the lower-right crop rectangle corner.
       \param c1 = C-coordinate of the lower-right crop rectangle corner.
       \param border_condition = Dirichlet (false) or Neumann border conditions.
    **/
    CImg<T>& crop(const int x0, const int y0, const int z0, const int c0,
                  const int x1, const int y1, const int z1, const int c1,
                  const bool border_condition=false) {
      return get_crop(x0,y0,z0,c0,x1,y1,z1,c1,border_condition).move_to(*this);
    }

    CImg<T> get_crop(const int x0, const int y0, const int z0, const int c0,
                     const int x1, const int y1, const int z1, const int c1,
                     const bool border_condition=false) const {
      if (is_empty()) return *this;
      const int
        nx0 = x0<x1?x0:x1, nx1 = x0^x1^nx0,
        ny0 = y0<y1?y0:y1, ny1 = y0^y1^ny0,
        nz0 = z0<z1?z0:z1, nz1 = z0^z1^nz0,
        nc0 = c0<c1?c0:c1, nc1 = c0^c1^nc0;
      CImg<T> res(1U + nx1 - nx0,1U + ny1 - ny0,1U + nz1 - nz0,1U + nc1 - nc0);
      if (nx0<0 || nx1>=width() || ny0<0 || ny1>=height() || nz0<0 || nz1>=depth() || nc0<0 || nc1>=spectrum()) {
        if (border_condition) cimg_forXYZC(res,x,y,z,c) res(x,y,z,c) = _atXYZC(nx0+x,ny0+y,nz0+z,nc0+c);
        else res.fill(0).draw_image(-nx0,-ny0,-nz0,-nc0,*this);
      } else res.draw_image(-nx0,-ny0,-nz0,-nc0,*this);
      return res;
    }

    //! Get a rectangular part of the instance image.
    /**
       \param x0 = X-coordinate of the upper-left crop rectangle corner.
       \param y0 = Y-coordinate of the upper-left crop rectangle corner.
       \param z0 = Z-coordinate of the upper-left crop rectangle corner.
       \param x1 = X-coordinate of the lower-right crop rectangle corner.
       \param y1 = Y-coordinate of the lower-right crop rectangle corner.
       \param z1 = Z-coordinate of the lower-right crop rectangle corner.
       \param border_condition = determine the type of border condition if
       some of the desired region is outside the image.
    **/
    CImg<T>& crop(const int x0, const int y0, const int z0,
                  const int x1, const int y1, const int z1,
                  const bool border_condition=false) {
      return crop(x0,y0,z0,0,x1,y1,z1,_spectrum-1,border_condition);
    }

    CImg<T> get_crop(const int x0, const int y0, const int z0,
                     const int x1, const int y1, const int z1,
                     const bool border_condition=false) const {
      return get_crop(x0,y0,z0,0,x1,y1,z1,_spectrum-1,border_condition);
    }

    //! Get a rectangular part of the instance image.
    /**
       \param x0 = X-coordinate of the upper-left crop rectangle corner.
       \param y0 = Y-coordinate of the upper-left crop rectangle corner.
       \param x1 = X-coordinate of the lower-right crop rectangle corner.
       \param y1 = Y-coordinate of the lower-right crop rectangle corner.
       \param border_condition = determine the type of border condition if
       some of the desired region is outside the image.
    **/
    CImg<T>& crop(const int x0, const int y0,
                  const int x1, const int y1,
                  const bool border_condition=false) {
      return crop(x0,y0,0,0,x1,y1,_depth - 1,_spectrum - 1,border_condition);
    }

    CImg<T> get_crop(const int x0, const int y0,
                     const int x1, const int y1,
                     const bool border_condition=false) const {
      return get_crop(x0,y0,0,0,x1,y1,_depth - 1,_spectrum - 1,border_condition);
    }

    //! Get a rectangular part of the instance image.
    /**
       \param x0 = X-coordinate of the upper-left crop rectangle corner.
       \param x1 = X-coordinate of the lower-right crop rectangle corner.
       \param border_condition = determine the type of border condition if
       some of the desired region is outside the image.
    **/
    CImg<T>& crop(const int x0, const int x1, const bool border_condition=false) {
      return crop(x0,0,0,0,x1,_height-1,_depth-1,_spectrum-1,border_condition);
    }

    CImg<T> get_crop(const int x0, const int x1, const bool border_condition=false) const {
      return get_crop(x0,0,0,0,x1,_height-1,_depth-1,_spectrum-1,border_condition);
    }

    //! Autocrop an image, regarding of the specified backround value.
    CImg<T>& autocrop(const T value, const char *const axes="czyx") {
      if (is_empty()) return *this;
      for (const char *s = axes; *s; ++s) {
        const char axis = cimg::uncase(*s);
        const CImg<intT> coords = _autocrop(value,axis);
        switch (axis) {
        case 'x' : {
          const int x0 = coords[0], x1 = coords[1];
          if (x0>=0 && x1>=0) crop(x0,x1);
        } break;
        case 'y' : {
          const int y0 = coords[0], y1 = coords[1];
          if (y0>=0 && y1>=0) crop(0,y0,_width-1,y1);
        } break;
        case 'z' : {
          const int z0 = coords[0], z1 = coords[1];
          if (z0>=0 && z1>=0) crop(0,0,z0,_width-1,_height-1,z1);
        } break;
        default : {
          const int c0 = coords[0], c1 = coords[1];
          if (c0>=0 && c1>=0) crop(0,0,0,c0,_width-1,_height-1,_depth-1,c1);
        }
        }
      }
      return *this;
    }

    CImg<T> get_autocrop(const T value, const char *const axes="czyx") const {
      return (+*this).autocrop(value,axes);
    }

    //! Autocrop an image, regarding of the specified backround color.
    CImg<T>& autocrop(const T *const color, const char *const axes="zyx") {
      if (is_empty()) return *this;
      for (const char *s = axes; *s; ++s) {
        const char axis = cimg::uncase(*s);
        switch (axis) {
        case 'x' : {
          int x0 = _width, x1 = -1;
          cimg_forC(*this,c) {
            const CImg<intT> coords = get_shared_channel(c)._autocrop(color[c],'x');
            const int nx0 = coords[0], nx1 = coords[1];
            if (nx0>=0 && nx1>=0) { x0 = cimg::min(x0,nx0); x1 = cimg::max(x1,nx1); }
          }
          if (x0<=x1) crop(x0,x1);
        } break;
        case 'y' : {
          int y0 = _height, y1 = -1;
          cimg_forC(*this,c) {
            const CImg<intT> coords = get_shared_channel(c)._autocrop(color[c],'y');
            const int ny0 = coords[0], ny1 = coords[1];
            if (ny0>=0 && ny1>=0) { y0 = cimg::min(y0,ny0); y1 = cimg::max(y1,ny1); }
          }
          if (y0<=y1) crop(0,y0,_width-1,y1);
        } break;
        default : {
          int z0 = _depth, z1 = -1;
          cimg_forC(*this,c) {
            const CImg<intT> coords = get_shared_channel(c)._autocrop(color[c],'z');
            const int nz0 = coords[0], nz1 = coords[1];
            if (nz0>=0 && nz1>=0) { z0 = cimg::min(z0,nz0); z1 = cimg::max(z1,nz1); }
          }
          if (z0<=z1) crop(0,0,z0,_width-1,_height-1,z1);
        }
        }
      }
      return *this;
    }

    CImg<T> get_autocrop(const T *const color, const char *const axes="zyx") const {
      return (+*this).autocrop(color,axes);
    }

    //! Autocrop an image, regarding of the specified backround color.
    template<typename t> CImg<T>& autocrop(const CImg<t>& color, const char *const axes="zyx") {
      return get_autocrop(color,axes).move_to(*this);
    }

    template<typename t> CImg<T> get_autocrop(const CImg<t>& color, const char *const axes="zyx") const {
      return get_autocrop(color._data,axes);
    }

    CImg<intT> _autocrop(const T value, const char axis) const {
      CImg<intT> res;
      int x0 = -1, y0 = -1, z0 = -1, c0 = -1, x1 = -1, y1 = -1, z1 = -1, c1 = -1;
      switch (cimg::uncase(axis)) {
      case 'x' : {
        cimg_forX(*this,x) cimg_forYZC(*this,y,z,c)
          if ((*this)(x,y,z,c)!=value) { x0 = x; x = width(); y = height(); z = depth(); c = spectrum(); }
        if (x0>=0) {
          for (int x = width()-1; x>=0; --x) cimg_forYZC(*this,y,z,c)
            if ((*this)(x,y,z,c)!=value) { x1 = x; x = 0; y = height(); z = depth(); c = spectrum(); }
        }
        res = CImg<intT>::vector(x0,x1);
      } break;
      case 'y' : {
        cimg_forY(*this,y) cimg_forXZC(*this,x,z,c)
          if ((*this)(x,y,z,c)!=value) { y0 = y; x = width(); y = height(); z = depth(); c = spectrum(); }
        if (y0>=0) {
          for (int y = height()-1; y>=0; --y) cimg_forXZC(*this,x,z,c)
            if ((*this)(x,y,z,c)!=value) { y1 = y; x = width(); y = 0; z = depth(); c = spectrum(); }
        }
        res = CImg<intT>::vector(y0,y1);
      } break;
      case 'z' : {
        cimg_forZ(*this,z) cimg_forXYC(*this,x,y,c)
          if ((*this)(x,y,z,c)!=value) { z0 = z; x = width(); y = height(); z = depth(); c = spectrum(); }
        if (z0>=0) {
          for (int z = depth()-1; z>=0; --z) cimg_forXYC(*this,x,y,c)
            if ((*this)(x,y,z,c)!=value) { z1 = z; x = width(); y = height(); z = 0; c = spectrum(); }
        }
        res = CImg<intT>::vector(z0,z1);
      } break;
      default : {
        cimg_forC(*this,c) cimg_forXYZ(*this,x,y,z)
          if ((*this)(x,y,z,c)!=value) { c0 = c; x = width(); y = height(); z = depth(); c = spectrum(); }
        if (c0>=0) {
          for (int c = spectrum()-1; c>=0; --c) cimg_forXYZ(*this,x,y,z)
            if ((*this)(x,y,z,c)!=value) { c1 = c; x = width(); y = height(); z = depth(); c = 0; }
        }
        res = CImg<intT>::vector(c0,c1);
      }
      }
      return res;
    }

    //! Get one column.
    CImg<T>& column(const unsigned int x0) {
      return columns(x0,x0);
    }

    CImg<T> get_column(const unsigned int x0) const {
      return get_columns(x0,x0);
    }

    //! Get a set of columns.
    CImg<T>& columns(const unsigned int x0, const unsigned int x1) {
      return get_columns(x0,x1).move_to(*this);
    }

    CImg<T> get_columns(const unsigned int x0, const unsigned int x1) const {
      return get_crop((int)x0,0,0,0,(int)x1,height()-1,depth()-1,spectrum()-1);
    }

    //! Get a line.
    CImg<T>& line(const unsigned int y0) {
      return lines(y0,y0);
    }

    CImg<T> get_line(const unsigned int y0) const {
      return get_lines(y0,y0);
    }

    //! Get a set of lines.
    CImg<T>& lines(const unsigned int y0, const unsigned int y1) {
      return get_lines(y0,y1).move_to(*this);
    }

    CImg<T> get_lines(const unsigned int y0, const unsigned int y1) const {
      return get_crop(0,(int)y0,0,0,width()-1,(int)y1,depth()-1,spectrum()-1);
    }

    //! Get a slice.
    CImg<T>& slice(const unsigned int z0) {
      return slices(z0,z0);
    }

    CImg<T> get_slice(const unsigned int z0) const {
      return get_slices(z0,z0);
    }

    //! Get a set of slices.
    CImg<T>& slices(const unsigned int z0, const unsigned int z1) {
      return get_slices(z0,z1).move_to(*this);
    }

    CImg<T> get_slices(const unsigned int z0, const unsigned int z1) const {
      return get_crop(0,0,(int)z0,0,width()-1,height()-1,(int)z1,spectrum()-1);
    }

    //! Get a channel.
    CImg<T>& channel(const unsigned int c0) {
      return channels(c0,c0);
    }

    CImg<T> get_channel(const unsigned int c0) const {
      return get_channels(c0,c0);
    }

    //! Get a set of channels.
    CImg<T>& channels(const unsigned int c0, const unsigned int c1) {
      return get_channels(c0,c1).move_to(*this);
    }

    CImg<T> get_channels(const unsigned int c0, const unsigned int c1) const {
      return get_crop(0,0,0,(int)c0,width()-1,height()-1,depth()-1,(int)c1);
    }

    //! Get a shared-memory image referencing a set of points of the instance image.
    CImg<T> get_shared_points(const unsigned int x0, const unsigned int x1,
                              const unsigned int y0=0, const unsigned int z0=0, const unsigned int c0=0) {
      const unsigned int beg = (unsigned int)offset(x0,y0,z0,c0), end = offset(x1,y0,z0,c0);
      if (beg>end || beg>=size() || end>=size())
        throw CImgArgumentException(_cimg_instance
                                    "get_shared_points() : Invalid request of a shared-memory subset (%u->%u,%u,%u,%u).",
                                    cimg_instance,
                                    x0,x1,y0,z0,c0);

      return CImg<T>(_data+beg,x1-x0+1,1,1,1,true);
    }

    const CImg<T> get_shared_points(const unsigned int x0, const unsigned int x1,
                                    const unsigned int y0=0, const unsigned int z0=0, const unsigned int c0=0) const {
      const unsigned int beg = (unsigned int)offset(x0,y0,z0,c0), end = offset(x1,y0,z0,c0);
      if (beg>end || beg>=size() || end>=size())
        throw CImgArgumentException(_cimg_instance
                                    "get_shared_points() : Invalid request of a shared-memory subset (%u->%u,%u,%u,%u).",
                                    cimg_instance,
                                    x0,x1,y0,z0,c0);

      return CImg<T>(_data+beg,x1-x0+1,1,1,1,true);
    }

    //! Return a shared-memory image referencing a set of lines of the instance image.
    CImg<T> get_shared_lines(const unsigned int y0, const unsigned int y1,
                             const unsigned int z0=0, const unsigned int c0=0) {
      const unsigned int beg = offset(0,y0,z0,c0), end = offset(0,y1,z0,c0);
      if (beg>end || beg>=size() || end>=size())
        throw CImgArgumentException(_cimg_instance
                                    "get_shared_lines() : Invalid request of a shared-memory subset (0->%u,%u->%u,%u,%u).",
                                    cimg_instance,
                                    _width-1,y0,y1,z0,c0);

      return CImg<T>(_data+beg,_width,y1-y0+1,1,1,true);
    }

    const CImg<T> get_shared_lines(const unsigned int y0, const unsigned int y1,
                                   const unsigned int z0=0, const unsigned int c0=0) const {
      const unsigned int beg = offset(0,y0,z0,c0), end = offset(0,y1,z0,c0);
      if (beg>end || beg>=size() || end>=size())
        throw CImgArgumentException(_cimg_instance
                                    "get_shared_lines() : Invalid request of a shared-memory subset (0->%u,%u->%u,%u,%u).",
                                    cimg_instance,
                                    _width-1,y0,y1,z0,c0);

      return CImg<T>(_data+beg,_width,y1-y0+1,1,1,true);
    }

    //! Return a shared-memory image referencing one particular line (y0,z0,c0) of the instance image.
    CImg<T> get_shared_line(const unsigned int y0, const unsigned int z0=0, const unsigned int c0=0) {
      return get_shared_lines(y0,y0,z0,c0);
    }

    const CImg<T> get_shared_line(const unsigned int y0, const unsigned int z0=0, const unsigned int c0=0) const {
      return get_shared_lines(y0,y0,z0,c0);
    }

    //! Return a shared memory image referencing a set of planes (z0->z1,c0) of the instance image.
    CImg<T> get_shared_planes(const unsigned int z0, const unsigned int z1, const unsigned int c0=0) {
      const unsigned int beg = offset(0,0,z0,c0), end = offset(0,0,z1,c0);
      if (beg>end || beg>=size() || end>=size())
        throw CImgArgumentException(_cimg_instance
                                    "get_shared_planes() : Invalid request of a shared-memory subset (0->%u,0->%u,%u->%u,%u).",
                                    cimg_instance,
                                    _width-1,_height-1,z0,z1,c0);

      return CImg<T>(_data+beg,_width,_height,z1-z0+1,1,true);
    }

    const CImg<T> get_shared_planes(const unsigned int z0, const unsigned int z1, const unsigned int c0=0) const {
      const unsigned int beg = offset(0,0,z0,c0), end = offset(0,0,z1,c0);
      if (beg>end || beg>=size() || end>=size())
        throw CImgArgumentException(_cimg_instance
                                    "get_shared_planes() : Invalid request of a shared-memory subset (0->%u,0->%u,%u->%u,%u).",
                                    cimg_instance,
                                    _width-1,_height-1,z0,z1,c0);

      return CImg<T>(_data+beg,_width,_height,z1-z0+1,1,true);
    }

    //! Return a shared-memory image referencing one plane (z0,c0) of the instance image.
    CImg<T> get_shared_plane(const unsigned int z0, const unsigned int c0=0) {
      return get_shared_planes(z0,z0,c0);
    }

    const CImg<T> get_shared_plane(const unsigned int z0, const unsigned int c0=0) const {
      return get_shared_planes(z0,z0,c0);
    }

    //! Return a shared-memory image referencing a set of channels (c0->c1) of the instance image.
    CImg<T> get_shared_channels(const unsigned int c0, const unsigned int c1) {
      const unsigned int beg = offset(0,0,0,c0), end = offset(0,0,0,c1);
      if (beg>end || beg>=size() || end>=size())
        throw CImgArgumentException(_cimg_instance
                                    "get_shared_channels() : Invalid request of a shared-memory subset (0->%u,0->%u,0->%u,%u->%u).",
                                    cimg_instance,
                                    _width-1,_height-1,_depth-1,c0,c1);

      return CImg<T>(_data+beg,_width,_height,_depth,c1-c0+1,true);
    }

    const CImg<T> get_shared_channels(const unsigned int c0, const unsigned int c1) const {
      const unsigned int beg = offset(0,0,0,c0), end = offset(0,0,0,c1);
      if (beg>end || beg>=size() || end>=size())
        throw CImgArgumentException(_cimg_instance
                                    "get_shared_channels() : Invalid request of a shared-memory subset (0->%u,0->%u,0->%u,%u->%u).",
                                    cimg_instance,
                                    _width-1,_height-1,_depth-1,c0,c1);

      return CImg<T>(_data+beg,_width,_height,_depth,c1-c0+1,true);
    }

    //! Return a shared-memory image referencing one channel c0 of the instance image.
    CImg<T> get_shared_channel(const unsigned int c0) {
      return get_shared_channels(c0,c0);
    }

    const CImg<T> get_shared_channel(const unsigned int c0) const {
      return get_shared_channels(c0,c0);
    }

    //! Return a shared version of the instance image.
    CImg<T> get_shared() {
      return CImg<T>(_data,_width,_height,_depth,_spectrum,true);
    }

    const CImg<T> get_shared() const {
      return CImg<T>(_data,_width,_height,_depth,_spectrum,true);
    }

    //! Split image into a list.
    CImgList<T> get_split(const char axis, const int nb=0) const {
      CImgList<T> res;
      const char naxis = cimg::uncase(axis);
      const unsigned int nnb = (unsigned int)(nb==0?1:(nb>0?nb:-nb));
      if (nb<=0) switch (naxis) { // Split by bloc size
      case 'x': {
        for (unsigned int p = 0; p<_width; p+=nnb) get_crop(p,0,0,0,cimg::min(p+nnb-1,_width-1),_height-1,_depth-1,_spectrum-1).move_to(res);
      } break;
      case 'y': {
        for (unsigned int p = 0; p<_height; p+=nnb) get_crop(0,p,0,0,_width-1,cimg::min(p+nnb-1,_height-1),_depth-1,_spectrum-1).move_to(res);
      } break;
      case 'z': {
        for (unsigned int p = 0; p<_depth; p+=nnb) get_crop(0,0,p,0,_width-1,_height-1,cimg::min(p+nnb-1,_depth-1),_spectrum-1).move_to(res);
      } break;
      default: {
        for (unsigned int p = 0; p<_spectrum; p+=nnb) get_crop(0,0,0,p,_width-1,_height-1,_depth-1,cimg::min(p+nnb-1,_spectrum-1)).move_to(res);
      }
      } else { // Split by number of blocs
        const unsigned int siz = naxis=='x'?_width:naxis=='y'?_height:naxis=='z'?_depth:naxis=='c'?_spectrum:0;
        if (nnb>siz)
          throw CImgArgumentException(_cimg_instance
                                      "get_split() : Instance cannot be split along %c-axis into %u blocs.",
                                      cimg_instance,
                                      axis,nnb);
        res.assign(nnb);
        switch (naxis) {
        case 'x' : {
          cimglist_for(res,p) get_crop(p*siz/nnb,0,0,0,(p+1)*siz/nnb-1,_height-1,_depth-1,_spectrum-1).move_to(res[p]);
        } break;
        case 'y' : {
          cimglist_for(res,p) get_crop(0,p*siz/nnb,0,0,_width-1,(p+1)*siz/nnb-1,_depth-1,_spectrum-1).move_to(res[p]);
        } break;
        case 'z' : {
          cimglist_for(res,p) get_crop(0,0,p*siz/nnb,0,_width-1,_height-1,(p+1)*siz/nnb-1,_spectrum-1).move_to(res[p]);
        } break;
        default : {
          cimglist_for(res,p) get_crop(0,0,0,p*siz/nnb,_width-1,_height-1,_depth-1,(p+1)*siz/nnb-1).move_to(res[p]);
        }
        }
      }
      return res;
    }

    //! Split image into a list of one-column vectors, according to specified splitting value.
    CImgList<T> get_split(const T value, const bool keep_values, const bool is_shared) const {
      CImgList<T> res;
      for (const T *ps = _data, *_ps = ps, *const pe = end(); ps<pe; ) {
        while (_ps<pe && *_ps==value) ++_ps;
        unsigned int siz = _ps - ps;
        if (siz && keep_values) res.insert(CImg<T>(ps,1,siz,1,1,is_shared),~0U,is_shared);
        ps = _ps;
        while (_ps<pe && *_ps!=value) ++_ps;
        siz = _ps - ps;
        if (siz) res.insert(CImg<T>(ps,1,siz,1,1,is_shared),~0U,is_shared);
        ps = _ps;
      }
      return res;
    }

    //! Split image into a list of one-column vectors, according to specified sequence of splitting values.
    /**
       \param values The splitting pattern of values.
       \param keep_values Can be :
          - false : Discard splitting values in resulting list.
          - true : Keep splitting values as separate images in resulting list.
     **/
    template<typename t>
    CImgList<T> get_split(const CImg<t>& values, const bool keep_values, const bool is_shared) const {
      if (!values) return CImgList<T>(*this);
      if (values.size()==1) return get_split(*values,keep_values,is_shared);
      CImgList<T> res;
      const t *pve = values.end();
      for (const T *ps = _data, *_ps = ps, *const pe = end(); ps<pe; ) {

        // Try to find match from current position.
        const t *pv = 0;
        do {
          pv = values._data;
          const T *__ps = _ps;
          while (__ps<pe && pv<pve && *__ps==(T)*pv) { ++__ps; ++pv; }
          if (pv==pve) _ps = __ps;
        } while (pv==pve);
        unsigned int siz = _ps - ps;
        if (siz && keep_values) res.insert(CImg<T>(ps,1,siz,1,1,is_shared),~0U,is_shared); // If match found.
        ps = _ps;

        // Try to find non-match from current position.
        do {
          pv = values._data;
          while (_ps<pe && *_ps!=(T)*pv) ++_ps;
          if (_ps<pe) {
            const T *__ps = _ps + 1;
            ++pv;
            while (__ps<pe && pv<pve && *__ps==(T)*pv) { ++__ps; ++pv; }
            if (pv!=pve) _ps = __ps;
          }
        } while (_ps<pe && pv!=pve);

        // Here, EOF of match found.
        siz = _ps - ps;
        if (siz) res.insert(CImg<T>(ps,1,siz,1,1,is_shared),~0U,is_shared);
        ps = _ps;
      }
      return res;
    }

    //! Append an image.
    template<typename t>
    CImg<T>& append(const CImg<t>& img, const char axis='x', const float align=0) {
      if (is_empty()) return assign(img,false);
      if (!img) return *this;
      return CImgList<T>(*this,true).insert(img).get_append(axis,align).move_to(*this);
    }

    CImg<T>& append(const CImg<T>& img, const char axis='x', const float align=0) {
      if (is_empty()) return assign(img,false);
      if (!img) return *this;
      return CImgList<T>(*this,img,true).get_append(axis,align).move_to(*this);
    }

    template<typename t>
    CImg<_cimg_Tt> get_append(const CImg<T>& img, const char axis='x', const float align=0) const {
      if (is_empty()) return +img;
      if (!img) return +*this;
      return CImgList<_cimg_Tt>(*this,true).insert(img).get_append(axis,align);
    }

    CImg<T> get_append(const CImg<T>& img, const char axis='x', const float align=0) const {
      if (is_empty()) return +img;
      if (!img) return +*this;
      return CImgList<T>(*this,img,true).get_append(axis,align);
    }

    //@}
    //---------------------------------------
    //
    //! \name Filtering / Transforms
    //@{
    //---------------------------------------

    //! Compute the correlation of the instance image by a mask.
    /**
       The correlation of the instance image \p *this by the mask \p mask is defined to be :

       res(x,y,z) = sum_{i,j,k} (*this)(x+i,y+j,z+k)*mask(i,j,k)

       \param mask = the correlation kernel.
       \param border_conditions = the border condition type (0=zero, 1=dirichlet)
       \param is_normalized = enable local normalization.
    **/
    template<typename t>
    CImg<T>& correlate(const CImg<t>& mask, const unsigned int border_conditions=1, const bool is_normalized=false) {
      if (is_empty() || !mask) return *this;
      return get_correlate(mask,border_conditions,is_normalized).move_to(*this);
    }

    template<typename t>
    CImg<_cimg_Ttfloat> get_correlate(const CImg<t>& mask, const unsigned int border_conditions=1,
                                      const bool is_normalized=false) const {
      if (is_empty() || !mask) return *this;
      typedef _cimg_Ttfloat Ttfloat;
      CImg<Ttfloat> res(_width,_height,_depth,cimg::max(_spectrum,mask._spectrum));
      if (border_conditions && mask._width==mask._height && ((mask._depth==1 && mask._width<=5) || (mask._depth==mask._width && mask._width<=3))) {
        // A special optimization is done for 2x2, 3x3, 4x4, 5x5, 2x2x2 and 3x3x3 mask (with border_conditions=1)
        Ttfloat *ptrd = res._data;
        switch (mask._depth) {
        case 3 : {
          T I[27] = { 0 };
          cimg_forC(res,c) {
            const CImg<T> _img = get_shared_channel(c%_spectrum);
            const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
            if (is_normalized) {
              const Ttfloat _M = (Ttfloat)_mask.magnitude(2), M = _M*_M;
              cimg_forZ(_img,z) cimg_for3x3x3(_img,x,y,z,0,I,T) {
                const Ttfloat N = M*(I[ 0]*I[ 0] + I[ 1]*I[ 1] + I[ 2]*I[ 2] +
                                     I[ 3]*I[ 3] + I[ 4]*I[ 4] + I[ 5]*I[ 5] +
                                     I[ 6]*I[ 6] + I[ 7]*I[ 7] + I[ 8]*I[ 8] +
                                     I[ 9]*I[ 9] + I[10]*I[10] + I[11]*I[11] +
                                     I[12]*I[12] + I[13]*I[13] + I[14]*I[14] +
                                     I[15]*I[15] + I[16]*I[16] + I[17]*I[17] +
                                     I[18]*I[18] + I[19]*I[19] + I[20]*I[20] +
                                     I[21]*I[21] + I[22]*I[22] + I[23]*I[23] +
                                     I[24]*I[24] + I[25]*I[25] + I[26]*I[26]);
                *(ptrd++) = (Ttfloat)(N?(I[ 0]*_mask[ 0] + I[ 1]*_mask[ 1] + I[ 2]*_mask[ 2] +
                                         I[ 3]*_mask[ 3] + I[ 4]*_mask[ 4] + I[ 5]*_mask[ 5] +
                                         I[ 6]*_mask[ 6] + I[ 7]*_mask[ 7] + I[ 8]*_mask[ 8] +
                                         I[ 9]*_mask[ 9] + I[10]*_mask[10] + I[11]*_mask[11] +
                                         I[12]*_mask[12] + I[13]*_mask[13] + I[14]*_mask[14] +
                                         I[15]*_mask[15] + I[16]*_mask[16] + I[17]*_mask[17] +
                                         I[18]*_mask[18] + I[19]*_mask[19] + I[20]*_mask[20] +
                                         I[21]*_mask[21] + I[22]*_mask[22] + I[23]*_mask[23] +
                                         I[24]*_mask[24] + I[25]*_mask[25] + I[26]*_mask[26])/std::sqrt(N):0);
              }
            } else cimg_forZ(_img,z) cimg_for3x3x3(_img,x,y,z,0,I,T)
                     *(ptrd++) = (Ttfloat)(I[ 0]*_mask[ 0] + I[ 1]*_mask[ 1] + I[ 2]*_mask[ 2] +
                                           I[ 3]*_mask[ 3] + I[ 4]*_mask[ 4] + I[ 5]*_mask[ 5] +
                                           I[ 6]*_mask[ 6] + I[ 7]*_mask[ 7] + I[ 8]*_mask[ 8] +
                                           I[ 9]*_mask[ 9] + I[10]*_mask[10] + I[11]*_mask[11] +
                                           I[12]*_mask[12] + I[13]*_mask[13] + I[14]*_mask[14] +
                                           I[15]*_mask[15] + I[16]*_mask[16] + I[17]*_mask[17] +
                                           I[18]*_mask[18] + I[19]*_mask[19] + I[20]*_mask[20] +
                                           I[21]*_mask[21] + I[22]*_mask[22] + I[23]*_mask[23] +
                                           I[24]*_mask[24] + I[25]*_mask[25] + I[26]*_mask[26]);
          }
        } break;
        case 2 : {
          T I[8] = { 0 };
          cimg_forC(res,c) {
            const CImg<T> _img = get_shared_channel(c%_spectrum);
            const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
            if (is_normalized) {
              const Ttfloat _M = (Ttfloat)_mask.magnitude(2), M = _M*_M;
              cimg_forZ(_img,z) cimg_for2x2x2(_img,x,y,z,0,I,T) {
                const Ttfloat N = M*(I[0]*I[0] + I[1]*I[1] +
                                     I[2]*I[2] + I[3]*I[3] +
                                     I[4]*I[4] + I[5]*I[5] +
                                     I[6]*I[6] + I[7]*I[7]);
                *(ptrd++) = (Ttfloat)(N?(I[0]*_mask[0] + I[1]*_mask[1] +
                                         I[2]*_mask[2] + I[3]*_mask[3] +
                                         I[4]*_mask[4] + I[5]*_mask[5] +
                                         I[6]*_mask[6] + I[7]*_mask[7])/std::sqrt(N):0);
              }
            } else cimg_forZ(_img,z) cimg_for2x2x2(_img,x,y,z,0,I,T)
                     *(ptrd++) = (Ttfloat)(I[0]*_mask[0] + I[1]*_mask[1] +
                                           I[2]*_mask[2] + I[3]*_mask[3] +
                                           I[4]*_mask[4] + I[5]*_mask[5] +
                                           I[6]*_mask[6] + I[7]*_mask[7]);
          }
        } break;
        default :
        case 1 :
          switch (mask._width) {
          case 6 : {
            T I[36] = { 0 };
            cimg_forC(res,c) {
              const CImg<T> _img = get_shared_channel(c%_spectrum);
              const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
              if (is_normalized) {
                const Ttfloat _M = (Ttfloat)_mask.magnitude(2), M = _M*_M;
                cimg_forZ(_img,z) cimg_for6x6(_img,x,y,z,0,I,T) {
                  const Ttfloat N = M*(I[ 0]*I[ 0] + I[ 1]*I[ 1] + I[ 2]*I[ 2] + I[ 3]*I[ 3] + I[ 4]*I[ 4] + I[ 5]*I[ 5] +
                                       I[ 6]*I[ 6] + I[ 7]*I[ 7] + I[ 8]*I[ 8] + I[ 9]*I[ 9] + I[10]*I[10] + I[11]*I[11] +
                                       I[12]*I[12] + I[13]*I[13] + I[14]*I[14] + I[15]*I[15] + I[16]*I[16] + I[17]*I[17] +
                                       I[18]*I[18] + I[19]*I[19] + I[20]*I[20] + I[21]*I[21] + I[22]*I[22] + I[23]*I[23] +
                                       I[24]*I[24] + I[25]*I[25] + I[26]*I[26] + I[27]*I[27] + I[28]*I[28] + I[29]*I[29] +
                                       I[30]*I[30] + I[31]*I[31] + I[32]*I[32] + I[33]*I[33] + I[34]*I[34] + I[35]*I[35]);
                  *(ptrd++) = (Ttfloat)(N?(I[ 0]*_mask[ 0] + I[ 1]*_mask[ 1] + I[ 2]*_mask[ 2] + I[ 3]*_mask[ 3] + I[ 4]*_mask[ 4] + I[ 5]*_mask[ 5] +
                                           I[ 6]*_mask[ 6] + I[ 7]*_mask[ 7] + I[ 8]*_mask[ 8] + I[ 9]*_mask[ 9] + I[10]*_mask[10] + I[11]*_mask[11] +
                                           I[12]*_mask[12] + I[13]*_mask[13] + I[14]*_mask[14] + I[15]*_mask[15] + I[16]*_mask[16] + I[17]*_mask[17] +
                                           I[18]*_mask[18] + I[19]*_mask[19] + I[20]*_mask[20] + I[21]*_mask[21] + I[22]*_mask[22] + I[23]*_mask[23] +
                                           I[24]*_mask[24] + I[25]*_mask[25] + I[26]*_mask[26] + I[27]*_mask[27] + I[28]*_mask[28] + I[29]*_mask[29] +
                                           I[30]*_mask[30] + I[31]*_mask[31] + I[32]*_mask[32] + I[33]*_mask[33] + I[34]*_mask[34] + I[35]*_mask[35])/std::sqrt(N):0);
                }
              } else cimg_forZ(_img,z) cimg_for6x6(_img,x,y,z,0,I,T)
                       *(ptrd++) = (Ttfloat)(I[ 0]*_mask[ 0] + I[ 1]*_mask[ 1] + I[ 2]*_mask[ 2] + I[ 3]*_mask[ 3] + I[ 4]*_mask[ 4] + I[ 5]*_mask[ 5] +
                                             I[ 6]*_mask[ 6] + I[ 7]*_mask[ 7] + I[ 8]*_mask[ 8] + I[ 9]*_mask[ 9] + I[10]*_mask[10] + I[11]*_mask[11] +
                                             I[12]*_mask[12] + I[13]*_mask[13] + I[14]*_mask[14] + I[15]*_mask[15] + I[16]*_mask[16] + I[17]*_mask[17] +
                                             I[18]*_mask[18] + I[19]*_mask[19] + I[20]*_mask[20] + I[21]*_mask[21] + I[22]*_mask[22] + I[23]*_mask[23] +
                                             I[24]*_mask[24] + I[25]*_mask[25] + I[26]*_mask[26] + I[27]*_mask[27] + I[28]*_mask[28] + I[29]*_mask[29] +
                                             I[30]*_mask[30] + I[31]*_mask[31] + I[32]*_mask[32] + I[33]*_mask[33] + I[34]*_mask[34] + I[35]*_mask[35]);
            }
          } break;
          case 5 : {
            T I[25] = { 0 };
            cimg_forC(res,c) {
              const CImg<T> _img = get_shared_channel(c%_spectrum);
              const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
              if (is_normalized) {
                const Ttfloat _M = (Ttfloat)_mask.magnitude(2), M = _M*_M;
                cimg_forZ(_img,z) cimg_for5x5(_img,x,y,z,0,I,T) {
                  const Ttfloat N = M*(I[ 0]*I[ 0] + I[ 1]*I[ 1] + I[ 2]*I[ 2] + I[ 3]*I[ 3] + I[ 4]*I[ 4] +
                                       I[ 5]*I[ 5] + I[ 6]*I[ 6] + I[ 7]*I[ 7] + I[ 8]*I[ 8] + I[ 9]*I[ 9] +
                                       I[10]*I[10] + I[11]*I[11] + I[12]*I[12] + I[13]*I[13] + I[14]*I[14] +
                                       I[15]*I[15] + I[16]*I[16] + I[17]*I[17] + I[18]*I[18] + I[19]*I[19] +
                                       I[20]*I[20] + I[21]*I[21] + I[22]*I[22] + I[23]*I[23] + I[24]*I[24]);
                  *(ptrd++) = (Ttfloat)(N?(I[ 0]*_mask[ 0] + I[ 1]*_mask[ 1] + I[ 2]*_mask[ 2] + I[ 3]*_mask[ 3] + I[ 4]*_mask[ 4] +
                                           I[ 5]*_mask[ 5] + I[ 6]*_mask[ 6] + I[ 7]*_mask[ 7] + I[ 8]*_mask[ 8] + I[ 9]*_mask[ 9] +
                                           I[10]*_mask[10] + I[11]*_mask[11] + I[12]*_mask[12] + I[13]*_mask[13] + I[14]*_mask[14] +
                                           I[15]*_mask[15] + I[16]*_mask[16] + I[17]*_mask[17] + I[18]*_mask[18] + I[19]*_mask[19] +
                                           I[20]*_mask[20] + I[21]*_mask[21] + I[22]*_mask[22] + I[23]*_mask[23] + I[24]*_mask[24])/std::sqrt(N):0);
                }
              } else cimg_forZ(_img,z) cimg_for5x5(_img,x,y,z,0,I,T)
                       *(ptrd++) = (Ttfloat)(I[ 0]*_mask[ 0] + I[ 1]*_mask[ 1] + I[ 2]*_mask[ 2] + I[ 3]*_mask[ 3] + I[ 4]*_mask[ 4] +
                                             I[ 5]*_mask[ 5] + I[ 6]*_mask[ 6] + I[ 7]*_mask[ 7] + I[ 8]*_mask[ 8] + I[ 9]*_mask[ 9] +
                                             I[10]*_mask[10] + I[11]*_mask[11] + I[12]*_mask[12] + I[13]*_mask[13] + I[14]*_mask[14] +
                                             I[15]*_mask[15] + I[16]*_mask[16] + I[17]*_mask[17] + I[18]*_mask[18] + I[19]*_mask[19] +
                                             I[20]*_mask[20] + I[21]*_mask[21] + I[22]*_mask[22] + I[23]*_mask[23] + I[24]*_mask[24]);
            }
          } break;
          case 4 : {
            T I[16] = { 0 };
            cimg_forC(res,c) {
              const CImg<T> _img = get_shared_channel(c%_spectrum);
              const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
              if (is_normalized) {
                const Ttfloat _M = (Ttfloat)_mask.magnitude(2), M = _M*_M;
                cimg_forZ(_img,z) cimg_for4x4(_img,x,y,z,0,I,T) {
                  const Ttfloat N = M*(I[ 0]*I[ 0] + I[ 1]*I[ 1] + I[ 2]*I[ 2] + I[ 3]*I[ 3] +
                                       I[ 4]*I[ 4] + I[ 5]*I[ 5] + I[ 6]*I[ 6] + I[ 7]*I[ 7] +
                                       I[ 8]*I[ 8] + I[ 9]*I[ 9] + I[10]*I[10] + I[11]*I[11] +
                                       I[12]*I[12] + I[13]*I[13] + I[14]*I[14] + I[15]*I[15]);
                  *(ptrd++) = (Ttfloat)(N?(I[ 0]*_mask[ 0] + I[ 1]*_mask[ 1] + I[ 2]*_mask[ 2] + I[ 3]*_mask[ 3] +
                                           I[ 4]*_mask[ 4] + I[ 5]*_mask[ 5] + I[ 6]*_mask[ 6] + I[ 7]*_mask[ 7] +
                                           I[ 8]*_mask[ 8] + I[ 9]*_mask[ 9] + I[10]*_mask[10] + I[11]*_mask[11] +
                                           I[12]*_mask[12] + I[13]*_mask[13] + I[14]*_mask[14] + I[15]*_mask[15])/std::sqrt(N):0);
                }
              } else cimg_forZ(_img,z) cimg_for4x4(_img,x,y,z,0,I,T)
                       *(ptrd++) = (Ttfloat)(I[ 0]*_mask[ 0] + I[ 1]*_mask[ 1] + I[ 2]*_mask[ 2] + I[ 3]*_mask[ 3] +
                                             I[ 4]*_mask[ 4] + I[ 5]*_mask[ 5] + I[ 6]*_mask[ 6] + I[ 7]*_mask[ 7] +
                                             I[ 8]*_mask[ 8] + I[ 9]*_mask[ 9] + I[10]*_mask[10] + I[11]*_mask[11] +
                                             I[12]*_mask[12] + I[13]*_mask[13] + I[14]*_mask[14] + I[15]*_mask[15]);
            }
          } break;
          case 3 : {
            T I[9] = { 0 };
            cimg_forC(res,c) {
              const CImg<T> _img = get_shared_channel(c%_spectrum);
              const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
              if (is_normalized) {
                const Ttfloat _M = (Ttfloat)_mask.magnitude(2), M = _M*_M;
                cimg_forZ(_img,z) cimg_for3x3(_img,x,y,z,0,I,T) {
                  const Ttfloat N = M*(I[0]*I[0] + I[1]*I[1] + I[2]*I[2] +
                                       I[3]*I[3] + I[4]*I[4] + I[5]*I[5] +
                                       I[6]*I[6] + I[7]*I[7] + I[8]*I[8]);
                  *(ptrd++) = (Ttfloat)(N?(I[0]*_mask[0] + I[1]*_mask[1] + I[2]*_mask[2] +
                                           I[3]*_mask[3] + I[4]*_mask[4] + I[5]*_mask[5] +
                                           I[6]*_mask[6] + I[7]*_mask[7] + I[8]*_mask[8])/std::sqrt(N):0);
                }
              } else cimg_forZ(_img,z) cimg_for3x3(_img,x,y,z,0,I,T)
                       *(ptrd++) = (Ttfloat)(I[0]*_mask[0] + I[1]*_mask[1] + I[2]*_mask[2] +
                                             I[3]*_mask[3] + I[4]*_mask[4] + I[5]*_mask[5] +
                                             I[6]*_mask[6] + I[7]*_mask[7] + I[8]*_mask[8]);
            }
          } break;
          case 2 : {
            T I[4] = { 0 };
            cimg_forC(res,c) {
              const CImg<T> _img = get_shared_channel(c%_spectrum);
              const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
              if (is_normalized) {
                const Ttfloat _M = (Ttfloat)_mask.magnitude(2), M = _M*_M;
                cimg_forZ(_img,z) cimg_for2x2(_img,x,y,z,0,I,T) {
                  const Ttfloat N = M*(I[0]*I[0] + I[1]*I[1] +
                                       I[2]*I[2] + I[3]*I[3]);
                  *(ptrd++) = (Ttfloat)(N?(I[0]*_mask[0] + I[1]*_mask[1] +
                                           I[2]*_mask[2] + I[3]*_mask[3])/std::sqrt(N):0);
                }
              } else cimg_forZ(_img,z) cimg_for2x2(_img,x,y,z,0,I,T)
                       *(ptrd++) = (Ttfloat)(I[0]*_mask[0] + I[1]*_mask[1] +
                                             I[2]*_mask[2] + I[3]*_mask[3]);
            }
          } break;
          case 1 :
            if (is_normalized) res.fill(1);
            else cimg_forC(res,c) {
                const CImg<T> _img = get_shared_channel(c%_spectrum);
                const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
                res.get_shared_channel(c).assign(_img)*=_mask[0];
              }
            break;
          }
        }
      } else { // Generic version for other masks and borders conditions.
        const int
          mx2 = mask.width()/2, my2 = mask.height()/2, mz2 = mask.depth()/2,
          mx1 = mx2 - 1 + (mask.width()%2), my1 = my2 - 1 + (mask.height()%2), mz1 = mz2 - 1 + (mask.depth()%2),
          mxe = width() - mx2, mye = height() - my2, mze = depth() - mz2;
        cimg_forC(res,c) {
          const CImg<T> _img = get_shared_channel(c%_spectrum);
          const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
          if (is_normalized) { // Normalized correlation.
            const Ttfloat _M = (Ttfloat)_mask.magnitude(2), M = _M*_M;
            for (int z = mz1; z<mze; ++z)
              for (int y = my1; y<mye; ++y)
                for (int x = mx1; x<mxe; ++x) {
                  Ttfloat val = 0, N = 0;
                  for (int zm = -mz1; zm<=mz2; ++zm)
                    for (int ym = -my1; ym<=my2; ++ym)
                      for (int xm = -mx1; xm<=mx2; ++xm) {
                        const Ttfloat _val = (Ttfloat)_img(x+xm,y+ym,z+zm);
                        val+=_val*_mask(mx1+xm,my1+ym,mz1+zm);
                        N+=_val*_val;
                      }
                  N*=M;
                  res(x,y,z,c) = (Ttfloat)(N?val/std::sqrt(N):0);
                }
            if (border_conditions)
              cimg_forYZ(res,y,z)
                for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                  Ttfloat val = 0, N = 0;
                  for (int zm = -mz1; zm<=mz2; ++zm)
                    for (int ym = -my1; ym<=my2; ++ym)
                      for (int xm = -mx1; xm<=mx2; ++xm) {
                        const Ttfloat _val = (Ttfloat)_img._atXYZ(x+xm,y+ym,z+zm);
                        val+=_val*_mask(mx1+xm,my1+ym,mz1+zm);
                        N+=_val*_val;
                      }
                  N*=M;
                  res(x,y,z,c) = (Ttfloat)(N?val/std::sqrt(N):0);
                }
            else
              cimg_forYZ(res,y,z)
                for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                  Ttfloat val = 0, N = 0;
                  for (int zm = -mz1; zm<=mz2; ++zm)
                    for (int ym = -my1; ym<=my2; ++ym)
                      for (int xm = -mx1; xm<=mx2; ++xm) {
                        const Ttfloat _val = (Ttfloat)_img.atXYZ(x+xm,y+ym,z+zm,0,0);
                        val+=_val*_mask(mx1+xm,my1+ym,mz1+zm);
                        N+=_val*_val;
                      }
                  N*=M;
                  res(x,y,z,c) = (Ttfloat)(N?val/std::sqrt(N):0);
                }
          } else { // Classical correlation.
            for (int z = mz1; z<mze; ++z)
              for (int y = my1; y<mye; ++y)
                for (int x = mx1; x<mxe; ++x) {
                  Ttfloat val = 0;
                  for (int zm = -mz1; zm<=mz2; ++zm)
                    for (int ym = -my1; ym<=my2; ++ym)
                      for (int xm = -mx1; xm<=mx2; ++xm)
                        val+=_img(x+xm,y+ym,z+zm)*_mask(mx1+xm,my1+ym,mz1+zm);
                  res(x,y,z,c) = (Ttfloat)val;
                }
            if (border_conditions)
              cimg_forYZ(res,y,z)
                for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                  Ttfloat val = 0;
                  for (int zm = -mz1; zm<=mz2; ++zm)
                    for (int ym = -my1; ym<=my2; ++ym)
                      for (int xm = -mx1; xm<=mx2; ++xm)
                        val+=_img._atXYZ(x+xm,y+ym,z+zm)*_mask(mx1+xm,my1+ym,mz1+zm);
                  res(x,y,z,c) = (Ttfloat)val;
                }
            else
              cimg_forYZ(res,y,z)
                for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                  Ttfloat val = 0;
                  for (int zm = -mz1; zm<=mz2; ++zm)
                    for (int ym = -my1; ym<=my2; ++ym)
                      for (int xm = -mx1; xm<=mx2; ++xm)
                        val+=_img.atXYZ(x+xm,y+ym,z+zm,0,0)*_mask(mx1+xm,my1+ym,mz1+zm);
                  res(x,y,z,c) = (Ttfloat)val;
                }
          }
        }
      }
      return res;
    }

    //! Compute the convolution of the image by a mask.
    /**
       The result \p res of the convolution of an image \p img by a mask \p mask is defined to be :

       res(x,y,z) = sum_{i,j,k} img(x-i,y-j,z-k)*mask(i,j,k)

       \param mask = the correlation kernel.
       \param border_conditions = the border condition type (0=zero, 1=dirichlet)
       \param is_normalized = enable local normalization.
    **/
    template<typename t>
    CImg<T>& convolve(const CImg<t>& mask, const unsigned int border_conditions=1, const bool is_normalized=false) {
      if (is_empty() || !mask) return *this;
      return get_convolve(mask,border_conditions,is_normalized).move_to(*this);
    }

    template<typename t>
    CImg<_cimg_Ttfloat> get_convolve(const CImg<t>& mask, const unsigned int border_conditions=1,
                                     const bool is_normalized=false) const {
      if (is_empty() || !mask) return *this;
      return get_correlate(CImg<t>(mask._data,mask.size(),1,1,1,true).get_mirror('x').resize(mask,-1),border_conditions,is_normalized);
    }

    //! Return the erosion of the image by a structuring element.
    template<typename t>
    CImg<T>& erode(const CImg<t>& mask, const unsigned int border_conditions=1, const bool is_normalized=false) {
      if (is_empty() || !mask) return *this;
      return get_erode(mask,border_conditions,is_normalized).move_to(*this);
    }

    template<typename t>
    CImg<_cimg_Tt> get_erode(const CImg<t>& mask, const unsigned int border_conditions=1,
                             const bool is_normalized=false) const {
      if (is_empty() || !mask) return *this;
      typedef _cimg_Tt Tt;
      CImg<Tt> res(_width,_height,_depth,cimg::max(_spectrum,mask._spectrum));
      const int
        mx2 = mask.width()/2, my2 = mask.height()/2, mz2 = mask.depth()/2,
        mx1 = mx2 - 1 + (mask.width()%2), my1 = my2 - 1 + (mask.height()%2), mz1 = mz2 - 1 + (mask.depth()%2),
        mxe = width() - mx2, mye = height() - my2, mze = depth() - mz2;
      cimg_forC(*this,c) {
        const CImg<T> _img = get_shared_channel(c%_spectrum);
        const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
        if (is_normalized) { // Normalized erosion.
          for (int z = mz1; z<mze; ++z)
            for (int y = my1; y<mye; ++y)
              for (int x = mx1; x<mxe; ++x) {
                Tt min_val = cimg::type<Tt>::max();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const t mval = _mask(mx1+xm,my1+ym,mz1+zm);
                      const Tt cval = (Tt)(_img(x+xm,y+ym,z+zm) + mval);
                      if (mval && cval<min_val) min_val = cval;
                    }
                res(x,y,z,c) = min_val;
              }
          if (border_conditions)
            cimg_forYZ(res,y,z)
              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                Tt min_val = cimg::type<Tt>::max();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const t mval = _mask(mx1+xm,my1+ym,mz1+zm);
                      const Tt cval = (Tt)(_img._atXYZ(x+xm,y+ym,z+zm) + mval);
                      if (mval && cval<min_val) min_val = cval;
                    }
                res(x,y,z,c) = min_val;
              }
          else
            cimg_forYZ(res,y,z)
              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                Tt min_val = cimg::type<Tt>::max();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const t mval = _mask(mx1+xm,my1+ym,mz1+zm);
                      const Tt cval = (Tt)(_img.atXYZ(x+xm,y+ym,z+zm,0,0) + mval);
                      if (mval && cval<min_val) min_val = cval;
                    }
                res(x,y,z,c) = min_val;
              }
        } else { // Classical erosion.
          for (int z = mz1; z<mze; ++z)
            for (int y = my1; y<mye; ++y)
              for (int x = mx1; x<mxe; ++x) {
                Tt min_val = cimg::type<Tt>::max();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const Tt cval = (Tt)_img(x+xm,y+ym,z+zm);
                      if (_mask(mx1+xm,my1+ym,mz1+zm) && cval<min_val) min_val = cval;
                    }
                res(x,y,z,c) = min_val;
              }
          if (border_conditions)
            cimg_forYZ(res,y,z)
              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                Tt min_val = cimg::type<Tt>::max();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const T cval = (Tt)_img._atXYZ(x+xm,y+ym,z+zm);
                      if (_mask(mx1+xm,my1+ym,mz1+zm) && cval<min_val) min_val = cval;
                    }
                res(x,y,z,c) = min_val;
              }
          else
            cimg_forYZ(res,y,z)
              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                Tt min_val = cimg::type<Tt>::max();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const T cval = (Tt)_img.atXYZ(x+xm,y+ym,z+zm,0,0);
                      if (_mask(mx1+xm,my1+ym,mz1+zm) && cval<min_val) min_val = cval;
                    }
                res(x,y,z,c) = min_val;
              }
        }
      }
      return res;
    }

    //! Erode the image by a rectangular structuring element of size sx,sy,sz.
    CImg<T>& erode(const unsigned int sx, const unsigned int sy, const unsigned int sz=1) {
      if (is_empty() || (sx==1 && sy==1 && sz==1)) return *this;
      if (sx>1 && _width>1) { // Along X-axis.
        const int L = width(), off = 1, s = (int)sx, _s1 = s/2, _s2 = s - _s1, s1 = _s1>L?L:_s1, s2 = _s2>L?L:_s2;
        CImg<T> buf(L);
        T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
        cimg_forYZC(*this,y,z,c) {
          const T *const ptrsb = data(0,y,z,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
          ptrd = buf._data; T cur = *ptrs; ptrs+=off; bool is_first = true;
          for (int p = s2-1; p>0 && ptrs<=ptrse; --p) { const T val = *ptrs; ptrs+=off; if (val<=cur) { cur = val; is_first = false; }} *(ptrd++) = cur;
          for (int p = s1; p>0 && ptrd<=ptrde; --p) { const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val<=cur) { cur = val; is_first = false; } *(ptrd++) = cur; }
          for (int p = L - s - 1; p>0; --p) {
            const T val = *ptrs; ptrs+=off;
            if (is_first) {
              const T *nptrs = ptrs - off; cur = val;
              for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval<cur) cur = nval; }
              nptrs-=off; const T nval = *nptrs; if (nval<cur) { cur = nval; is_first = true; } else is_first = false;
            } else { if (val<=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
            *(ptrd++) = cur;
          }
          ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
          for (int p = s1; p>0 && ptrs>=ptrsb; --p) { const T val = *ptrs; ptrs-=off; if (val<cur) cur = val; } *(ptrd--) = cur;
          for (int p = s2-1; p>0 && ptrd>=ptrdb; --p) { const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val<cur) cur = val; *(ptrd--) = cur; }
          T *pd = data(_width-1,y,z,c) + off; cimg_for(buf,ps,T) { pd-=off; *pd = *ps; }
        }
      }

      if (sy>1 && _height>1) { // Along Y-axis.
        const int L = height(), off = width(), s = (int)sy, _s1 = s/2, _s2 = s - _s1, s1 = _s1>L?L:_s1, s2 = _s2>L?L:_s2;
        CImg<T> buf(L);
        T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
        cimg_forXZC(*this,x,z,c) {
          const T *const ptrsb = data(x,0,z,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
          ptrd = buf._data; T cur = *ptrs; ptrs+=off; bool is_first = true;
          for (int p = s2-1; p>0 && ptrs<=ptrse; --p) { const T val = *ptrs; ptrs+=off; if (val<=cur) { cur = val; is_first = false; }} *(ptrd++) = cur;
          for (int p = s1; p>0 && ptrd<=ptrde; --p) { const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val<=cur) { cur = val; is_first = false; } *(ptrd++) = cur; }
          for (int p = L - s - 1; p>0; --p) {
            const T val = *ptrs; ptrs+=off;
            if (is_first) {
              const T *nptrs = ptrs - off; cur = val;
              for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval<cur) cur = nval; }
              nptrs-=off; const T nval = *nptrs; if (nval<cur) { cur = nval; is_first = true; } else is_first = false;
            } else { if (val<=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
            *(ptrd++) = cur;
          }
          ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
          for (int p = s1; p>0 && ptrs>=ptrsb; --p) { const T val = *ptrs; ptrs-=off; if (val<cur) cur = val; } *(ptrd--) = cur;
          for (int p = s2-1; p>0 && ptrd>=ptrdb; --p) { const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val<cur) cur = val; *(ptrd--) = cur; }
          T *pd = data(x,_height-1,z,c) + off; cimg_for(buf,ps,T) { pd-=off; *pd = *ps; }
        }
      }

      if (sz>1 && _depth>1) { // Along Z-axis.
        const int L = depth(), off = width()*height(), s = (int)sz, _s1 = s/2, _s2 = s - _s1, s1 = _s1>L?L:_s1, s2 = _s2>L?L:_s2;
        CImg<T> buf(L);
        T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
        cimg_forXYC(*this,x,y,c) {
          const T *const ptrsb = data(x,y,0,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
          ptrd = buf._data; T cur = *ptrs; ptrs+=off; bool is_first = true;
          for (int p = s2-1; p>0 && ptrs<=ptrse; --p) { const T val = *ptrs; ptrs+=off; if (val<=cur) { cur = val; is_first = false; }} *(ptrd++) = cur;
          for (int p = s1; p>0 && ptrd<=ptrde; --p) { const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val<=cur) { cur = val; is_first = false; } *(ptrd++) = cur; }
          for (int p = L - s - 1; p>0; --p) {
            const T val = *ptrs; ptrs+=off;
            if (is_first) {
              const T *nptrs = ptrs - off; cur = val;
              for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval<cur) cur = nval; }
              nptrs-=off; const T nval = *nptrs; if (nval<cur) { cur = nval; is_first = true; } else is_first = false;
            } else { if (val<=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
            *(ptrd++) = cur;
          }
          ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
          for (int p = s1; p>0 && ptrs>=ptrsb; --p) { const T val = *ptrs; ptrs-=off; if (val<cur) cur = val; } *(ptrd--) = cur;
          for (int p = s2-1; p>0 && ptrd>=ptrdb; --p) { const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val<cur) cur = val; *(ptrd--) = cur; }
          T *pd = data(x,y,_depth-1,c) + off; cimg_for(buf,ps,T) { pd-=off; *pd = *ps; }
        }
      }
      return *this;
    }

    CImg<T> get_erode(const unsigned int sx, const unsigned int sy, const unsigned int sz=1) const {
      return (+*this).erode(sx,sy,sz);
    }

    //! Erode the image by a square structuring element of size sx.
    CImg<T>& erode(const unsigned int s) {
      return erode(s,s,s);
    }

    CImg<T> get_erode(const unsigned int s) const {
      return (+*this).erode(s);
    }

    //! Dilate the image by a structuring element.
    template<typename t>
    CImg<T>& dilate(const CImg<t>& mask, const unsigned int border_conditions=1, const bool is_normalized=false) {
      if (is_empty() || !mask) return *this;
      return get_dilate(mask,border_conditions,is_normalized).move_to(*this);
    }

    template<typename t>
    CImg<_cimg_Tt> get_dilate(const CImg<t>& mask, const unsigned int border_conditions=1,
                              const bool is_normalized=false) const {
      if (is_empty() || !mask) return *this;
      typedef _cimg_Tt Tt;
      CImg<Tt> res(_width,_height,_depth,_spectrum);
      const int
        mx2 = mask.width()/2, my2 = mask.height()/2, mz2 = mask.depth()/2,
        mx1 = mx2 - 1 + (mask.width()%2), my1 = my2 - 1 + (mask.height()%2), mz1 = mz2 - 1 + (mask.depth()%2),
        mxe = width() - mx2, mye = height() - my2, mze = depth() - mz2;
      cimg_forC(*this,c) {
        const CImg<T> _img = get_shared_channel(c%_spectrum);
        const CImg<t> _mask = mask.get_shared_channel(c%mask._spectrum);
        if (is_normalized) { // Normalized dilation.
          for (int z = mz1; z<mze; ++z)
            for (int y = my1; y<mye; ++y)
              for (int x = mx1; x<mxe; ++x) {
                Tt max_val = cimg::type<Tt>::min();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const t mval = _mask(mx1+xm,my1+ym,mz1+zm);
                      const Tt cval = (Tt)(_img(x+xm,y+ym,z+zm) - mval);
                      if (mval && cval>max_val) max_val = cval;
                    }
                res(x,y,z,c) = max_val;
              }
          if (border_conditions)
            cimg_forYZ(res,y,z)
              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                Tt max_val = cimg::type<Tt>::min();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const t mval = _mask(mx1+xm,my1+ym,mz1+zm);
                      const Tt cval = (Tt)(_img._atXYZ(x+xm,y+ym,z+zm) - mval);
                      if (mval && cval>max_val) max_val = cval;
                    }
                res(x,y,z,c) = max_val;
              }
          else
            cimg_forYZ(*this,y,z)
              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                Tt max_val = cimg::type<Tt>::min();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const t mval = _mask(mx1+xm,my1+ym,mz1+zm);
                      const Tt cval = (Tt)(_img.atXYZ(x+xm,y+ym,z+zm,0,0) - mval);
                      if (mval && cval>max_val) max_val = cval;
                    }
                res(x,y,z,c) = max_val;
              }
        } else { // Classical dilation.
          for (int z = mz1; z<mze; ++z)
            for (int y = my1; y<mye; ++y)
              for (int x = mx1; x<mxe; ++x) {
                Tt max_val = cimg::type<Tt>::min();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const Tt cval = (Tt)_img(x+xm,y+ym,z+zm);
                      if (_mask(mx1+xm,my1+ym,mz1+zm) && cval>max_val) max_val = cval;
                    }
                res(x,y,z,c) = max_val;
              }
          if (border_conditions)
            cimg_forYZ(res,y,z)
              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                Tt max_val = cimg::type<Tt>::min();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const T cval = (Tt)_img._atXYZ(x+xm,y+ym,z+zm);
                      if (_mask(mx1+xm,my1+ym,mz1+zm) && cval>max_val) max_val = cval;
                    }
                res(x,y,z,c) = max_val;
              }
          else
            cimg_forYZ(res,y,z)
              for (int x = 0; x<width(); (y<my1 || y>=mye || z<mz1 || z>=mze)?++x:((x<mx1-1 || x>=mxe)?++x:(x=mxe))) {
                Tt max_val = cimg::type<Tt>::min();
                for (int zm = -mz1; zm<=mz2; ++zm)
                  for (int ym = -my1; ym<=my2; ++ym)
                    for (int xm = -mx1; xm<=mx2; ++xm) {
                      const T cval = (Tt)_img.atXYZ(x+xm,y+ym,z+zm,0,0);
                      if (_mask(mx1+xm,my1+ym,mz1+zm) && cval>max_val) max_val = cval;
                    }
                res(x,y,z,c) = max_val;
              }
        }
      }
      return res;
    }

    //! Dilate the image by a rectangular structuring element of size sx,sy,sz.
    CImg<T>& dilate(const unsigned int sx, const unsigned int sy, const unsigned int sz=1) {
      if (is_empty() || (sx==1 && sy==1 && sz==1)) return *this;
      if (sx>1 && _width>1) { // Along X-axis.
        const int L = width(), off = 1, s = (int)sx, _s2 = s/2 + 1, _s1 = s - _s2, s1 = _s1>L?L:_s1, s2 = _s2>L?L:_s2;
        CImg<T> buf(L);
        T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
        cimg_forYZC(*this,y,z,c) {
          const T *const ptrsb = data(0,y,z,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
          ptrd = buf._data; T cur = *ptrs; ptrs+=off; bool is_first = true;
          for (int p = s2-1; p>0 && ptrs<=ptrse; --p) { const T val = *ptrs; ptrs+=off; if (val>=cur) { cur = val; is_first = false; }} *(ptrd++) = cur;
          for (int p = s1; p>0 && ptrd<=ptrde; --p) { const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val>=cur) { cur = val; is_first = false; } *(ptrd++) = cur; }
          for (int p = L - s - 1; p>0; --p) {
            const T val = *ptrs; ptrs+=off;
            if (is_first) {
              const T *nptrs = ptrs - off; cur = val;
              for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval>cur) cur = nval; }
              nptrs-=off; const T nval = *nptrs; if (nval>cur) { cur = nval; is_first = true; } else is_first = false;
            } else { if (val>=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
            *(ptrd++) = cur;
          }
          ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
          for (int p = s1; p>0 && ptrs>=ptrsb; --p) { const T val = *ptrs; ptrs-=off; if (val>cur) cur = val; } *(ptrd--) = cur;
          for (int p = s2-1; p>0 && ptrd>=ptrdb; --p) { const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val>cur) cur = val; *(ptrd--) = cur; }
          T *pd = data(_width-1,y,z,c) + off; cimg_for(buf,ps,T) { pd-=off; *pd = *ps; }
        }
      }

      if (sy>1 && _height>1) { // Along Y-axis.
        const int L = height(), off = width(), s = (int)sy, _s2 = s/2 + 1, _s1 = s - _s2, s1 = _s1>L?L:_s1, s2 = _s2>L?L:_s2;
        CImg<T> buf(L);
        T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
        cimg_forXZC(*this,x,z,c) {
          const T *const ptrsb = data(x,0,z,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
          ptrd = buf._data; T cur = *ptrs; ptrs+=off; bool is_first = true;
          for (int p = s2-1; p>0 && ptrs<=ptrse; --p) { const T val = *ptrs; ptrs+=off; if (val>=cur) { cur = val; is_first = false; }} *(ptrd++) = cur;
          for (int p = s1; p>0 && ptrd<=ptrde; --p) { const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val>=cur) { cur = val; is_first = false; } *(ptrd++) = cur; }
          for (int p = L - s - 1; p>0; --p) {
            const T val = *ptrs; ptrs+=off;
            if (is_first) {
              const T *nptrs = ptrs - off; cur = val;
              for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval>cur) cur = nval; }
              nptrs-=off; const T nval = *nptrs; if (nval>cur) { cur = nval; is_first = true; } else is_first = false;
            } else { if (val>=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
            *(ptrd++) = cur;
          }
          ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
          for (int p = s1; p>0 && ptrs>=ptrsb; --p) { const T val = *ptrs; ptrs-=off; if (val>cur) cur = val; } *(ptrd--) = cur;
          for (int p = s2-1; p>0 && ptrd>=ptrdb; --p) { const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val>cur) cur = val; *(ptrd--) = cur; }
          T *pd = data(x,_height-1,z,c) + off; cimg_for(buf,ps,T) { pd-=off; *pd = *ps; }
        }
      }

      if (sz>1 && _depth>1) { // Along Z-axis.
        const int L = depth(), off = width()*height(), s = (int)sz, _s2 = s/2 + 1, _s1 = s - _s2, s1 = _s1>L?L:_s1, s2 = _s2>L?L:_s2;
        CImg<T> buf(L);
        T *const ptrdb = buf._data, *ptrd = ptrdb, *const ptrde = buf._data + L - 1;
        cimg_forXYC(*this,x,y,c) {
          const T *const ptrsb = data(x,y,0,c), *ptrs = ptrsb, *const ptrse = ptrs + L*off - off;
          ptrd = buf._data; T cur = *ptrs; ptrs+=off; bool is_first = true;
          for (int p = s2-1; p>0 && ptrs<=ptrse; --p) { const T val = *ptrs; ptrs+=off; if (val>=cur) { cur = val; is_first = false; }} *(ptrd++) = cur;
          for (int p = s1; p>0 && ptrd<=ptrde; --p) { const T val = *ptrs; if (ptrs<ptrse) ptrs+=off; if (val>=cur) { cur = val; is_first = false; } *(ptrd++) = cur; }
          for (int p = L - s - 1; p>0; --p) {
            const T val = *ptrs; ptrs+=off;
            if (is_first) {
              const T *nptrs = ptrs - off; cur = val;
              for (int q = s - 2; q>0; --q) { nptrs-=off; const T nval = *nptrs; if (nval>cur) cur = nval; }
              nptrs-=off; const T nval = *nptrs; if (nval>cur) { cur = nval; is_first = true; } else is_first = false;
            } else { if (val>=cur) cur = val; else if (cur==*(ptrs-s*off)) is_first = true; }
            *(ptrd++) = cur;
          }
          ptrd = ptrde; ptrs = ptrse; cur = *ptrs; ptrs-=off;
          for (int p = s1; p>0 && ptrs>=ptrsb; --p) { const T val = *ptrs; ptrs-=off; if (val>cur) cur = val; } *(ptrd--) = cur;
          for (int p = s2-1; p>0 && ptrd>=ptrdb; --p) { const T val = *ptrs; if (ptrs>ptrsb) ptrs-=off; if (val>cur) cur = val; *(ptrd--) = cur; }
          T *pd = data(x,y,_depth-1,c) + off; cimg_for(buf,ps,T) { pd-=off; *pd = *ps; }
        }
      }
      return *this;
    }

    CImg<T> get_dilate(const unsigned int sx, const unsigned int sy, const unsigned int sz=1) const {
      return (+*this).dilate(sx,sy,sz);
    }

    //! Erode the image by a square structuring element of size sx.
    CImg<T>& dilate(const unsigned int s) {
      return dilate(s,s,s);
    }

    CImg<T> get_dilate(const unsigned int s) const {
      return (+*this).dilate(s);
    }

    //! Compute the watershed transform, from an instance image of non-zero labels.
    template<typename t>
    CImg<T>& watershed(const CImg<t>& priority, const bool fill_lines=true) {
      if (is_empty()) return *this;
      if (!is_sameXYZ(priority))
        throw CImgArgumentException(_cimg_instance
                                    "watershed() : Instance image and specified priority (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,priority._width,priority._height,priority._depth,priority._spectrum,priority._data);
      if (_spectrum!=1) { cimg_forC(*this,c) get_shared_channel(c).watershed(priority.get_shared_channel(c%priority._spectrum),fill_lines); return *this; }

      CImg<boolT> in_queue(_width,_height,_depth,1,0);
      CImg<typename cimg::superset2<T,t,int>::type> Q;
      unsigned int sizeQ = 0;

      // Find seed points and insert them in priority queue.
      const T *ptrs = _data;
      cimg_forXYZ(*this,x,y,z) if (*(ptrs++)) {
        if (x-1>=0 && !(*this)(x-1,y,z))       Q._watershed_insert(in_queue,sizeQ,priority(x-1,y,z),x-1,y,z);
        if (x+1<width() && !(*this)(x+1,y,z))  Q._watershed_insert(in_queue,sizeQ,priority(x+1,y,z),x+1,y,z);
        if (y-1>=0 && !(*this)(x,y-1,z))       Q._watershed_insert(in_queue,sizeQ,priority(x,y-1,z),x,y-1,z);
        if (y+1<height() && !(*this)(x,y+1,z)) Q._watershed_insert(in_queue,sizeQ,priority(x,y+1,z),x,y+1,z);
        if (z-1>=0 && !(*this)(x,y,z-1))       Q._watershed_insert(in_queue,sizeQ,priority(x,y,z-1),x,y,z-1);
        if (z+1<depth() && !(*this)(x,y,z+1))  Q._watershed_insert(in_queue,sizeQ,priority(x,y,z+1),x,y,z+1);
      }

      // Start watershed computation.
      while (sizeQ) {

        // Get and remove point with minimal priority from the queue.
        const int x = (int)Q(0,1), y = (int)Q(0,2), z = (int)Q(0,3);
        Q._watershed_remove(sizeQ);

        // Check labels of the neighbors.
        bool is_same_label = true;
        unsigned int label = 0;
        if (x-1>=0) {
          if ((*this)(x-1,y,z)) { if (!label) label = (*this)(x-1,y,z); else if (label!=(*this)(x-1,y,z)) is_same_label = false; }
          else Q._watershed_insert(in_queue,sizeQ,priority(x-1,y,z),x-1,y,z);
        }
        if (x+1<width()) {
          if ((*this)(x+1,y,z)) { if (!label) label = (*this)(x+1,y,z); else if (label!=(*this)(x+1,y,z)) is_same_label = false; }
          else Q._watershed_insert(in_queue,sizeQ,priority(x+1,y,z),x+1,y,z);
        }
        if (y-1>=0) {
          if ((*this)(x,y-1,z)) { if (!label) label = (*this)(x,y-1,z); else if (label!=(*this)(x,y-1,z)) is_same_label = false; }
          else Q._watershed_insert(in_queue,sizeQ,priority(x,y-1,z),x,y-1,z);
        }
        if (y+1<height()) {
          if ((*this)(x,y+1,z)) { if (!label) label = (*this)(x,y+1,z); else if (label!=(*this)(x,y+1,z)) is_same_label = false; }
          else Q._watershed_insert(in_queue,sizeQ,priority(x,y+1,z),x,y+1,z);
        }
        if (z-1>=0) {
          if ((*this)(x,y,z-1)) { if (!label) label = (*this)(x,y,z-1); else if (label!=(*this)(x,y,z-1)) is_same_label = false; }
          else Q._watershed_insert(in_queue,sizeQ,priority(x,y,z-1),x,y,z-1);
        }
        if (z+1<depth()) {
          if ((*this)(x,y,z+1)) { if (!label) label = (*this)(x,y,z+1); else if (label!=(*this)(x,y,z+1)) is_same_label = false; }
          else Q._watershed_insert(in_queue,sizeQ,priority(x,y,z+1),x,y,z+1);
        }
        if (is_same_label) (*this)(x,y,z) = label;
      }

      // Fill lines.
      if (fill_lines) {

        // Sort all non-labeled pixels with labeled neighbors.
        in_queue = false;
        const T *ptrs = _data;
        cimg_forXYZ(*this,x,y,z) if (!*(ptrs++) &&
                                     ((x-1>=0 && (*this)(x-1,y,z)) || (x+1<width() && (*this)(x+1,y,z)) ||
                                      (y-1>=0 && (*this)(x,y-1,z)) || (y+1<height() && (*this)(x,y+1,z)) ||
                                      (z-1>=0 && (*this)(x,y,z-1)) || (z+1>depth() && (*this)(x,y,z+1))))
          Q._watershed_insert(in_queue,sizeQ,priority(x,y,z),x,y,z);

        // Start line filling process.
        while (sizeQ) {
          const int x = (int)Q(0,1), y = (int)Q(0,2), z = (int)Q(0,3);
          Q._watershed_remove(sizeQ);
          t pmax = cimg::type<t>::min();
          int xmax = 0, ymax = 0, zmax = 0;
          if (x-1>=0) {
            if ((*this)(x-1,y,z)) { if (priority(x-1,y,z)>pmax) { pmax = priority(x-1,y,z); xmax = x-1; ymax = y; zmax = z; }}
            else Q._watershed_insert(in_queue,sizeQ,priority(x-1,y,z),x-1,y,z);
          }
          if (x+1<width()) {
            if ((*this)(x+1,y,z)) { if (priority(x+1,y,z)>pmax) { pmax = priority(x+1,y,z); xmax = x+1; ymax = y; zmax = z; }}
            else Q._watershed_insert(in_queue,sizeQ,priority(x+1,y,z),x+1,y,z);
          }
          if (y-1>=0) {
            if ((*this)(x,y-1,z)) { if (priority(x,y-1,z)>pmax) { pmax = priority(x,y-1,z); xmax = x; ymax = y-1; zmax = z; }}
            else Q._watershed_insert(in_queue,sizeQ,priority(x,y-1,z),x,y-1,z);
          }
          if (y+1<height()) {
            if ((*this)(x,y+1,z)) { if (priority(x,y+1,z)>pmax) { pmax = priority(x,y+1,z); xmax = x; ymax = y+1; zmax = z; }}
            else Q._watershed_insert(in_queue,sizeQ,priority(x,y+1,z),x,y+1,z);
          }
          if (z-1>=0) {
            if ((*this)(x,y,z-1)) { if (priority(x,y,z-1)>pmax) { pmax = priority(x,y,z-1); xmax = x; ymax = y; zmax = z-1; }}
            else Q._watershed_insert(in_queue,sizeQ,priority(x,y,z-1),x,y,z-1);
          }
          if (z+1<depth()) {
            if ((*this)(x,y,z+1)) { if (priority(x,y,z+1)>pmax) { pmax = priority(x,y,z+1); xmax = x; ymax = y; zmax = z+1; }}
            else Q._watershed_insert(in_queue,sizeQ,priority(x,y,z+1),x,y,z+1);
          }
          (*this)(x,y,z) = (*this)(xmax,ymax,zmax);
        }
      }
      return *this;
    }

    template<typename t>
    CImg<T> get_watershed(const CImg<t>& priority, const bool fill_lines=true) const {
      return (+*this).watershed(priority,fill_lines);
    }

    // Insert/Remove items in priority queue, for watershed transform.
    template<typename t>
    CImg<T>& _watershed_insert(CImg<boolT>& in_queue, unsigned int& siz, const t value, const unsigned int x, const unsigned int y, const unsigned int z) {
      if (in_queue(x,y,z)) return *this;
      in_queue(x,y,z) = true;
      if (++siz>=_width) { if (!is_empty()) resize(_width*2,4,1,1,0); else assign(64,4); }
      (*this)(siz-1,0) = (T)value; (*this)(siz-1,1) = (T)x; (*this)(siz-1,2) = (T)y; (*this)(siz-1,3) = (T)z;
      for (unsigned int pos = siz - 1, par = 0; pos && value>(*this)(par=(pos+1)/2-1,0); pos = par) {
        cimg::swap((*this)(pos,0),(*this)(par,0)); cimg::swap((*this)(pos,1),(*this)(par,1));
        cimg::swap((*this)(pos,2),(*this)(par,2)); cimg::swap((*this)(pos,3),(*this)(par,3));
      }
      return *this;
    }

    CImg<T>& _watershed_remove(unsigned int& siz) {
      (*this)(0,0) = (*this)(--siz,0); (*this)(0,1) = (*this)(siz,1); (*this)(0,2) = (*this)(siz,2); (*this)(0,3) = (*this)(siz,3);
      const float value = (*this)(0,0);
      for (unsigned int pos = 0, left = 0, right = 0;
           ((right=2*(pos+1),(left=right-1))<siz && value<(*this)(left,0)) || (right<siz && value<(*this)(right,0));) {
        if (right<siz) {
          if ((*this)(left,0)>(*this)(right,0)) {
            cimg::swap((*this)(pos,0),(*this)(left,0)); cimg::swap((*this)(pos,1),(*this)(left,1));
            cimg::swap((*this)(pos,2),(*this)(left,2)); cimg::swap((*this)(pos,3),(*this)(left,3));
            pos = left;
          } else {
            cimg::swap((*this)(pos,0),(*this)(right,0)); cimg::swap((*this)(pos,1),(*this)(right,1));
            cimg::swap((*this)(pos,2),(*this)(right,2)); cimg::swap((*this)(pos,3),(*this)(right,3));
            pos = right;
          }
        } else {
          cimg::swap((*this)(pos,0),(*this)(left,0)); cimg::swap((*this)(pos,1),(*this)(left,1));
          cimg::swap((*this)(pos,2),(*this)(left,2)); cimg::swap((*this)(pos,3),(*this)(left,3));
          pos = left;
        }
      }
      return *this;
    }

    //! Compute the result of the Deriche filter.
    /**
       The Canny-Deriche filter is a recursive algorithm allowing to compute blurred derivatives of
       order 0,1 or 2 of an image.
    **/
    CImg<T>& deriche(const float sigma, const int order=0, const char axis='x', const bool cond=true) {
#define _cimg_deriche2_apply \
  Tfloat *ptrY = Y._data, yb = 0, yp = 0; \
  T xp = (T)0; \
  if (cond) { xp = *ptrX; yb = yp = (Tfloat)(coefp*xp); } \
  for (int m = 0; m<N; ++m) { \
    const T xc = *ptrX; ptrX+=off; \
    const Tfloat yc = *(ptrY++) = (Tfloat)(a0*xc + a1*xp - b1*yp - b2*yb); \
    xp = xc; yb = yp; yp = yc; \
  } \
  T xn = (T)0, xa = (T)0; \
  Tfloat yn = 0, ya = 0; \
  if (cond) { xn = xa = *(ptrX-off); yn = ya = (Tfloat)coefn*xn; } \
  for (int n = N-1; n>=0; --n) { \
    const T xc = *(ptrX-=off); \
    const Tfloat yc = (Tfloat)(a2*xn + a3*xa - b1*yn - b2*ya); \
    xa = xn; xn = xc; ya = yn; yn = yc; \
    *ptrX = (T)(*(--ptrY)+yc); \
  }
      const char naxis = cimg::uncase(axis);
      const float nsigma = sigma>=0?sigma:-sigma*(naxis=='x'?_width:naxis=='y'?_height:naxis=='z'?_depth:_spectrum)/100;
      if (is_empty() || (nsigma<0.1 && !order)) return *this;
      const float
        nnsigma = nsigma<0.1f?0.1f:nsigma,
        alpha = 1.695f/nnsigma,
        ema = (float)std::exp(-alpha),
        ema2 = (float)std::exp(-2*alpha),
        b1 = -2*ema,
        b2 = ema2;
      float a0 = 0, a1 = 0, a2 = 0, a3 = 0, coefp = 0, coefn = 0;
      switch (order) {
      case 0 : {
        const float k = (1-ema)*(1-ema)/(1+2*alpha*ema-ema2);
        a0 = k;
        a1 = k*(alpha-1)*ema;
        a2 = k*(alpha+1)*ema;
        a3 = -k*ema2;
      } break;
      case 1 : {
        const float k = (1-ema)*(1-ema)/ema;
        a0 = k*ema;
        a1 = a3 = 0;
        a2 = -a0;
      } break;
      case 2 : {
        const float
          ea = (float)std::exp(-alpha),
          k = -(ema2-1)/(2*alpha*ema),
          kn = (-2*(-1+3*ea-3*ea*ea+ea*ea*ea)/(3*ea+1+3*ea*ea+ea*ea*ea));
        a0 = kn;
        a1 = -kn*(1+k*alpha)*ema;
        a2 = kn*(1-k*alpha)*ema;
        a3 = -kn*ema2;
      } break;
      default :
        throw CImgArgumentException(_cimg_instance
                                    "deriche() : Invalid specified filter order %u "
                                    "(should be { 0=smoothing | 1=1st-derivative | 2=2nd-derivative }).",
                                    cimg_instance,
                                    order);
      }
      coefp = (a0+a1)/(1+b1+b2);
      coefn = (a2+a3)/(1+b1+b2);
      switch (naxis) {
      case 'x' : {
        const int N = _width, off = 1;
        CImg<Tfloat> Y(N);
        cimg_forYZC(*this,y,z,c) { T *ptrX = data(0,y,z,c); _cimg_deriche2_apply; }
      } break;
      case 'y' : {
        const int N = _height, off = _width;
        CImg<Tfloat> Y(N);
        cimg_forXZC(*this,x,z,c) { T *ptrX = data(x,0,z,c); _cimg_deriche2_apply; }
      } break;
      case 'z' : {
        const int N = _depth, off = _width*_height;
        CImg<Tfloat> Y(N);
        cimg_forXYC(*this,x,y,c) { T *ptrX = data(x,y,0,c); _cimg_deriche2_apply; }
      } break;
      default : {
        const int N = _spectrum, off = _width*_height*_depth;
        CImg<Tfloat> Y(N);
        cimg_forXYZ(*this,x,y,z) { T *ptrX = data(x,y,z,0); _cimg_deriche2_apply; }
      }
      }
      return *this;
    }

    CImg<Tfloat> get_deriche(const float sigma, const int order=0, const char axis='x', const bool cond=true) const {
      return CImg<Tfloat>(*this,false).deriche(sigma,order,axis,cond);
    }

    //! Return a blurred version of the image, using a Canny-Deriche filter.
    /**
       Blur the image with an anisotropic exponential filter (Deriche filter of order 0).
    **/
    CImg<T>& blur(const float sigmax, const float sigmay, const float sigmaz, const bool cond=true) {
      if (!is_empty()) {
        if (_width>1) deriche(sigmax,0,'x',cond);
        if (_height>1) deriche(sigmay,0,'y',cond);
        if (_depth>1) deriche(sigmaz,0,'z',cond);
      }
      return *this;
    }

    CImg<Tfloat> get_blur(const float sigmax, const float sigmay, const float sigmaz, const bool cond=true) const {
      return CImg<Tfloat>(*this,false).blur(sigmax,sigmay,sigmaz,cond);
    }

    //! Return a blurred version of the image, using a Canny-Deriche filter.
    CImg<T>& blur(const float sigma, const bool cond=true) {
      const float nsigma = sigma>=0?sigma:-sigma*cimg::max(_width,_height,_depth)/100;
      return blur(nsigma,nsigma,nsigma,cond);
    }

    CImg<Tfloat> get_blur(const float sigma, const bool cond=true) const {
      return CImg<Tfloat>(*this,false).blur(sigma,cond);
    }

    //! Blur the image anisotropically following a field of diffusion tensors.
    /**
       \param G = Field of square roots of diffusion tensors/vectors used to drive the smoothing.
       \param amplitude = amplitude of the smoothing.
       \param dl = spatial discretization.
       \param da = angular discretization.
       \param gauss_prec = precision of the gaussian function.
       \param interpolation Used interpolation scheme (0 = nearest-neighbor, 1 = linear, 2 = Runge-Kutta)
       \param fast_approx = Tell to use the fast approximation or not.
    **/
    template<typename t>
    CImg<T>& blur_anisotropic(const CImg<t>& G,
                              const float amplitude=60, const float dl=0.8f, const float da=30,
                              const float gauss_prec=2, const unsigned int interpolation_type=0,
                              const bool fast_approx=1) {

      // Check arguments and init variables
      if (!is_sameXYZ(G) || (G._spectrum!=3 && G._spectrum!=6))
        throw CImgArgumentException(_cimg_instance
                                    "blur_anisotropic() : Invalid specified diffusion tensor field (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    G._width,G._height,G._depth,G._spectrum,G._data);

      if (is_empty() || amplitude<=0 || dl<0) return *this;
      const bool is_3d = (G._spectrum==6);
      T val_min, val_max = max_min(val_min);

      if (da<=0) {  // Iterated oriented Laplacians
        CImg<Tfloat> velocity(_width,_height,_depth,_spectrum);
        for (unsigned int iteration = 0; iteration<(unsigned int)amplitude; ++iteration) {
          Tfloat *ptrd = velocity._data, veloc_max = 0;
          if (is_3d) { // 3d version
            CImg_3x3x3(I,Tfloat);
            cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
              const Tfloat
                ixx = Incc + Ipcc - 2*Iccc,
                ixy = (Innc + Ippc - Inpc - Ipnc)/4,
                ixz = (Incn + Ipcp - Incp - Ipcn)/4,
                iyy = Icnc + Icpc - 2*Iccc,
                iyz = (Icnn + Icpp - Icnp - Icpn)/4,
                izz = Iccn + Iccp - 2*Iccc,
                veloc = (Tfloat)(G(x,y,z,0)*ixx + 2*G(x,y,z,1)*ixy + 2*G(x,y,z,2)*ixz + G(x,y,z,3)*iyy + 2*G(x,y,z,4)*iyz + G(x,y,z,5)*izz);
              *(ptrd++) = veloc;
              if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
            }
          } else { // 2d version
            CImg_3x3(I,Tfloat);
            cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
              const Tfloat
                ixx = Inc + Ipc - 2*Icc,
                ixy = (Inn + Ipp - Inp - Ipn)/4,
                iyy = Icn + Icp - 2*Icc,
                veloc = (Tfloat)(G(x,y,0,0)*ixx + 2*G(x,y,0,1)*ixy + G(x,y,0,2)*iyy);
              *(ptrd++) = veloc;
              if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
            }
          }
          if (veloc_max>0) *this+=(velocity*=dl/veloc_max);
        }
      } else { // LIC-based smoothing.
        const unsigned int whd = _width*_height*_depth;
        const float sqrt2amplitude = (float)std::sqrt(2*amplitude);
        const int dx1 = width() - 1, dy1 = height() - 1, dz1 = depth() - 1;
        CImg<Tfloat> res(_width,_height,_depth,_spectrum,0), W(_width,_height,_depth,is_3d?4:3), val(_spectrum);
        int N = 0;
        if (is_3d) { // 3d version
          for (float phi = (180%(int)da)/2.0f; phi<=180; phi+=da) {
            const float phir = (float)(phi*cimg::PI/180), datmp = (float)(da/std::cos(phir)), da2 = datmp<1?360.0f:datmp;
            for (float theta = 0; theta<360; (theta+=da2),++N) {
              const float
                thetar = (float)(theta*cimg::PI/180),
                vx = (float)(std::cos(thetar)*std::cos(phir)),
                vy = (float)(std::sin(thetar)*std::cos(phir)),
                vz = (float)std::sin(phir);
              const t
                *pa = G.data(0,0,0,0), *pb = G.data(0,0,0,1), *pc = G.data(0,0,0,2),
                *pd = G.data(0,0,0,3), *pe = G.data(0,0,0,4), *pf = G.data(0,0,0,5);
              Tfloat *pd0 = W.data(0,0,0,0), *pd1 = W.data(0,0,0,1), *pd2 = W.data(0,0,0,2), *pd3 = W.data(0,0,0,3);
              cimg_forXYZ(G,xg,yg,zg) {
                const t a = *(pa++), b = *(pb++), c = *(pc++), d = *(pd++), e = *(pe++), f = *(pf++);
                const float
                  u = (float)(a*vx + b*vy + c*vz),
                  v = (float)(b*vx + d*vy + e*vz),
                  w = (float)(c*vx + e*vy + f*vz),
                  n = (float)std::sqrt(1e-5+u*u+v*v+w*w),
                  dln = dl/n;
                *(pd0++) = (Tfloat)(u*dln);
                *(pd1++) = (Tfloat)(v*dln);
                *(pd2++) = (Tfloat)(w*dln);
                *(pd3++) = (Tfloat)n;
              }

              Tfloat *ptrd = res._data;
              cimg_forXYZ(*this,x,y,z) {
                val.fill(0);
                const float
                  n = (float)W(x,y,z,3),
                  fsigma = (float)(n*sqrt2amplitude),
                  fsigma2 = 2*fsigma*fsigma,
                  length = gauss_prec*fsigma;
                float
                  S = 0,
                  X = (float)x,
                  Y = (float)y,
                  Z = (float)z;
                switch (interpolation_type) {
                case 0 : { // Nearest neighbor
                  for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1 && Z>=0 && Z<=dz1; l+=dl) {
                    const int
                      cx = (int)(X+0.5f),
                      cy = (int)(Y+0.5f),
                      cz = (int)(Z+0.5f);
                    const float
                      u = (float)W(cx,cy,cz,0),
                      v = (float)W(cx,cy,cz,1),
                      w = (float)W(cx,cy,cz,2);
                    if (fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)(*this)(cx,cy,cz,c); ++S; }
                    else {
                      const float coef = (float)std::exp(-l*l/fsigma2);
                      cimg_forC(*this,c) val[c]+=(Tfloat)(coef*(*this)(cx,cy,cz,c));
                      S+=coef;
                    }
                    X+=u; Y+=v; Z+=w;
                  }
                } break;
                case 1 : { // Linear interpolation
                  for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1 && Z>=0 && Z<=dz1; l+=dl) {
                    const float
                      u = (float)(W._linear_atXYZ(X,Y,Z,0)),
                      v = (float)(W._linear_atXYZ(X,Y,Z,1)),
                      w = (float)(W._linear_atXYZ(X,Y,Z,2));
                    if (fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)_linear_atXYZ(X,Y,Z,c); ++S; }
                    else {
                      const float coef = (float)std::exp(-l*l/fsigma2);
                      cimg_forC(*this,c) val[c]+=(Tfloat)(coef*_linear_atXYZ(X,Y,Z,c));
                      S+=coef;
                    }
                    X+=u; Y+=v; Z+=w;
                  }
                } break;
                default : { // 2nd order Runge Kutta
                  for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1 && Z>=0 && Z<=dz1; l+=dl) {
                    const float
                      u0 = (float)(0.5f*W._linear_atXYZ(X,Y,Z,0)),
                      v0 = (float)(0.5f*W._linear_atXYZ(X,Y,Z,1)),
                      w0 = (float)(0.5f*W._linear_atXYZ(X,Y,Z,2)),
                      u = (float)(W._linear_atXYZ(X+u0,Y+v0,Z+w0,0)),
                      v = (float)(W._linear_atXYZ(X+u0,Y+v0,Z+w0,1)),
                      w = (float)(W._linear_atXYZ(X+u0,Y+v0,Z+w0,2));
                    if (fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)_linear_atXYZ(X,Y,Z,c); ++S; }
                    else {
                      const float coef = (float)std::exp(-l*l/fsigma2);
                      cimg_forC(*this,c) val[c]+=(Tfloat)(coef*_linear_atXYZ(X,Y,Z,c));
                      S+=coef;
                    }
                    X+=u; Y+=v; Z+=w;
                  }
                } break;
                }
                Tfloat *_ptrd = ptrd++;
                if (S>0) cimg_forC(res,c) { *_ptrd+=val[c]/S; _ptrd+=whd; }
                else cimg_forC(res,c) { *_ptrd+=(Tfloat)((*this)(x,y,z,c)); _ptrd+=whd; }
              }
            }
          }
        } else { // 2d LIC algorithm
          for (float theta = (360%(int)da)/2.0f; theta<360; (theta+=da),++N) {
            const float thetar = (float)(theta*cimg::PI/180), vx = (float)(std::cos(thetar)), vy = (float)(std::sin(thetar));
            const t *pa = G.data(0,0,0,0), *pb = G.data(0,0,0,1), *pc = G.data(0,0,0,2);
            Tfloat *pd0 = W.data(0,0,0,0), *pd1 = W.data(0,0,0,1), *pd2 = W.data(0,0,0,2);
            cimg_forXY(G,xg,yg) {
              const t a = *(pa++), b = *(pb++), c = *(pc++);
              const float
                u = (float)(a*vx + b*vy),
                v = (float)(b*vx + c*vy),
                n = (float)std::sqrt(1e-5+u*u+v*v),
                dln = dl/n;
              *(pd0++) = (Tfloat)(u*dln);
              *(pd1++) = (Tfloat)(v*dln);
              *(pd2++) = (Tfloat)n;
            }
            Tfloat *ptrd = res._data;
            cimg_forXY(*this,x,y) {
              val.fill(0);
              const float
                n = (float)W(x,y,0,2),
                fsigma = (float)(n*sqrt2amplitude),
                fsigma2 = 2*fsigma*fsigma,
                length = gauss_prec*fsigma;
              float
                S = 0,
                X = (float)x,
                Y = (float)y;
              switch (interpolation_type) {
              case 0 : { // Nearest-neighbor
                for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1; l+=dl) {
                  const int
                    cx = (int)(X+0.5f),
                    cy = (int)(Y+0.5f);
                  const float
                    u = (float)W(cx,cy,0,0),
                    v = (float)W(cx,cy,0,1);
                  if (fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)(*this)(cx,cy,0,c); ++S; }
                  else {
                    const float coef = (float)std::exp(-l*l/fsigma2);
                    cimg_forC(*this,c) val[c]+=(Tfloat)(coef*(*this)(cx,cy,0,c));
                    S+=coef;
                  }
                  X+=u; Y+=v;
                }
              } break;
              case 1 : { // Linear interpolation
                for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1; l+=dl) {
                  const float
                    u = (float)(W._linear_atXY(X,Y,0,0)),
                    v = (float)(W._linear_atXY(X,Y,0,1));
                  if (fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)_linear_atXY(X,Y,0,c); ++S; }
                  else {
                    const float coef = (float)std::exp(-l*l/fsigma2);
                    cimg_forC(*this,c) val[c]+=(Tfloat)(coef*_linear_atXY(X,Y,0,c));
                    S+=coef;
                  }
                  X+=u; Y+=v;
                }
              } break;
              default : { // 2nd-order Runge-kutta interpolation
                for (float l = 0; l<length && X>=0 && X<=dx1 && Y>=0 && Y<=dy1; l+=dl) {
                  const float
                    u0 = (float)(0.5f*W._linear_atXY(X,Y,0,0)),
                    v0 = (float)(0.5f*W._linear_atXY(X,Y,0,1)),
                    u = (float)(W._linear_atXY(X+u0,Y+v0,0,0)),
                    v = (float)(W._linear_atXY(X+u0,Y+v0,0,1));
                  if (fast_approx) { cimg_forC(*this,c) val[c]+=(Tfloat)_linear_atXY(X,Y,0,c); ++S; }
                  else {
                    const float coef = (float)std::exp(-l*l/fsigma2);
                    cimg_forC(*this,c) val[c]+=(Tfloat)(coef*_linear_atXY(X,Y,0,c));
                    S+=coef;
                  }
                  X+=u; Y+=v;
                }
              }
              }
              Tfloat *_ptrd = ptrd++;
              if (S>0) cimg_forC(res,c) { *_ptrd+=val[c]/S; _ptrd+=whd; }
              else cimg_forC(res,c) { *_ptrd+=(Tfloat)((*this)(x,y,0,c)); _ptrd+=whd; }
            }
          }
        }
        const Tfloat *ptrs = res.end();
        cimg_for(*this,ptrd,T) { const Tfloat val = *(--ptrs)/N; *ptrd = val<val_min?val_min:(val>val_max?val_max:(T)val); }
      }
      return *this;
    }

    template<typename t>
    CImg<T> get_blur_anisotropic(const CImg<t>& G,
                                 const float amplitude=60, const float dl=0.8f, const float da=30,
                                 const float gauss_prec=2, const unsigned int interpolation_type=0,
                                 const bool fast_approx=true) const {
      return (+*this).blur_anisotropic(G,amplitude,dl,da,gauss_prec,interpolation_type,fast_approx);
    }

    //! Blur an image following in an anisotropic way.
    CImg<T>& blur_anisotropic(const float amplitude, const float sharpness=0.7f, const float anisotropy=0.6f,
                              const float alpha=0.6f, const float sigma=1.1f, const float dl=0.8f, const float da=30,
                              const float gauss_prec=2, const unsigned int interpolation_type=0,
                              const bool fast_approx=true) {
      return blur_anisotropic(get_edge_tensors(sharpness,anisotropy,alpha,sigma,interpolation_type!=3),
                              amplitude,dl,da,gauss_prec,interpolation_type,fast_approx);
    }

    CImg<T> get_blur_anisotropic(const float amplitude, const float sharpness=0.7f, const float anisotropy=0.6f,
                                 const float alpha=0.6f, const float sigma=1.1f, const float dl=0.8f,
                                 const float da=30, const float gauss_prec=2, const unsigned int interpolation_type=0,
                                 const bool fast_approx=true) const {
      return (+*this).blur_anisotropic(amplitude,sharpness,anisotropy,alpha,sigma,dl,da,gauss_prec,interpolation_type,fast_approx);
    }

    //! Blur an image using the bilateral filter.
    /**
       \param sigma_x Amount of blur along the X-axis.
       \param sigma_y Amount of blur along the Y-axis.
       \param sigma_z Amount of blur along the Z-axis.
       \param sigma_r Amount of blur along the range axis.
       \param bgrid_x Size of the bilateral grid along the X-axis.
       \param bgrid_y Size of the bilateral grid along the Y-axis.
       \param bgrid_z Size of the bilateral grid along the Z-axis.
       \param bgrid_r Size of the bilateral grid along the range axis.
       \param interpolation_type Use interpolation for image slicing.
       \note This algorithm uses the optimisation technique proposed by S. Paris and F. Durand, in ECCV'2006
       (extended for 3d volumetric images).
    **/
    CImg<T>& blur_bilateral(const float sigma_x, const float sigma_y, const float sigma_z, const float sigma_r,
                            const int bgrid_x, const int bgrid_y, const int bgrid_z, const int bgrid_r,
                            const bool interpolation_type=true) {
      if (is_empty()) return *this;
      T m, M = max_min(m);
      const float range = (float)(1.0f + M - m);
      const unsigned int
        bx0 = bgrid_x>=0?bgrid_x:_width*(-bgrid_x)/100,
        by0 = bgrid_y>=0?bgrid_y:_height*(-bgrid_y)/100,
        bz0 = bgrid_z>=0?bgrid_z:_depth*(-bgrid_z)/100,
        br0 = bgrid_r>=0?bgrid_r:(int)(-range*bgrid_r/100),
        bx = bx0>0?bx0:1,
        by = by0>0?by0:1,
        bz = bz0>0?bz0:1,
        br = br0>0?br0:1;
      const float
        _sigma_x = sigma_x>=0?sigma_x:-sigma_x*_width/100,
        _sigma_y = sigma_y>=0?sigma_y:-sigma_y*_height/100,
        _sigma_z = sigma_z>=0?sigma_z:-sigma_z*_depth/100,
        nsigma_x = _sigma_x*bx/_width,
        nsigma_y = _sigma_y*by/_height,
        nsigma_z = _sigma_z*bz/_depth,
        nsigma_r = sigma_r*br/range;
      if (nsigma_x>0 || nsigma_y>0 || nsigma_z>0 || nsigma_r>0) {
        const bool is_3d = (_depth>1);
        if (is_3d) { // 3d version of the algorithm
          CImg<floatT> bgrid(bx,by,bz,br), bgridw(bx,by,bz,br);
          cimg_forC(*this,c) {
            bgrid.fill(0); bgridw.fill(0);
            cimg_forXYZ(*this,x,y,z) {
              const T val = (*this)(x,y,z,c);
              const int X = x*bx/_width, Y = y*by/_height, Z = z*bz/_depth, R = (int)((val-m)*br/range);
              bgrid(X,Y,Z,R) += (float)val;
              bgridw(X,Y,Z,R) += 1;
            }
            bgrid.blur(nsigma_x,nsigma_y,nsigma_z,true).deriche(nsigma_r,0,'c',false);
            bgridw.blur(nsigma_x,nsigma_y,nsigma_z,true).deriche(nsigma_r,0,'c',false);
            if (interpolation_type) cimg_forXYZ(*this,x,y,z) {
              const T val = (*this)(x,y,z,c);
              const float X = (float)x*bx/_width, Y = (float)y*by/_height, Z = (float)z*bz/_depth, R = (float)((val-m)*br/range),
                bval0 = bgrid._linear_atXYZC(X,Y,Z,R), bval1 = bgridw._linear_atXYZC(X,Y,Z,R);
              (*this)(x,y,z,c) = (T)(bval0/bval1);
            } else cimg_forXYZ(*this,x,y,z) {
              const T val = (*this)(x,y,z,c);
              const int X = x*bx/_width, Y = y*by/_height, Z = z*bz/_depth, R = (int)((val-m)*br/range);
              const float bval0 = bgrid(X,Y,Z,R), bval1 = bgridw(X,Y,Z,R);
              (*this)(x,y,z,c) = (T)(bval0/bval1);
            }
          }
        } else { // 2d version of the algorithm
          CImg<floatT> bgrid(bx,by,br,2);
          cimg_forC(*this,c) {
            bgrid.fill(0);
            cimg_forXY(*this,x,y) {
              const T val = (*this)(x,y,c);
              const int X = x*bx/_width, Y = y*by/_height, R = (int)((val-m)*br/range);
              bgrid(X,Y,R,0) += (float)val;
              bgrid(X,Y,R,1) += 1;
            }
            bgrid.blur(nsigma_x,nsigma_y,0,true).blur(0,0,nsigma_r,false);
            if (interpolation_type) cimg_forXY(*this,x,y) {
              const T val = (*this)(x,y,c);
              const float X = (float)x*bx/_width, Y = (float)y*by/_height, R = (float)((val-m)*br/range),
                bval0 = bgrid._linear_atXYZ(X,Y,R,0), bval1 = bgrid._linear_atXYZ(X,Y,R,1);
              (*this)(x,y,c) = (T)(bval0/bval1);
            } else cimg_forXY(*this,x,y) {
              const T val = (*this)(x,y,c);
              const int X = x*bx/_width, Y = y*by/_height, R = (int)((val-m)*br/range);
              const float bval0 = bgrid(X,Y,R,0), bval1 = bgrid(X,Y,R,1);
              (*this)(x,y,c) = (T)(bval0/bval1);
            }
          }
        }
      }
      return *this;
    }

    CImg<T> get_blur_bilateral(const float sigma_x, const float sigma_y, const float sigma_z, const float sigma_r,
                               const int bgrid_x, const int bgrid_y, const int bgrid_z, const int bgrid_r,
                               const bool interpolation_type=true) const {
      return (+*this).blur_bilateral(sigma_x,sigma_y,sigma_z,sigma_r,bgrid_x,bgrid_y,bgrid_z,bgrid_r,interpolation_type);
    }

    //! Blur an image using the bilateral filter.
    CImg<T>& blur_bilateral(const float sigma_s, const float sigma_r, const int bgrid_s=-33, const int bgrid_r=32,
                            const bool interpolation_type=true) {
      const float nsigma_s = sigma_s>=0?sigma_s:-sigma_s*cimg::max(_width,_height,_depth)/100;
      return blur_bilateral(nsigma_s,nsigma_s,nsigma_s,sigma_r,bgrid_s,bgrid_s,bgrid_s,bgrid_r,interpolation_type);
    }

    CImg<T> get_blur_bilateral(const float sigma_s, const float sigma_r, const int bgrid_s=-33, const int bgrid_r=32,
                               const bool interpolation_type=true) const {
      return (+*this).blur_bilateral(sigma_s,sigma_s,sigma_s,sigma_r,bgrid_s,bgrid_s,bgrid_s,bgrid_r,interpolation_type);
    }

    //! Blur an image in its patch-based space.
    CImg<T>& blur_patch(const float sigma_s, const float sigma_p, const unsigned int patch_size=3,
                        const unsigned int lookup_size=4, const float smoothness=0, const bool fast_approx=true) {
      return get_blur_patch(sigma_s,sigma_p,patch_size,lookup_size,smoothness,fast_approx).move_to(*this);
    }

    CImg<T> get_blur_patch(const float sigma_s, const float sigma_p, const unsigned int patch_size=3,
                           const unsigned int lookup_size=4, const float smoothness=0, const bool fast_approx=true) const {

#define _cimg_blur_patch3d_fast(N) \
      cimg_for##N##XYZ(res,x,y,z) { \
        T *pP = P._data; cimg_forC(res,c) { cimg_get##N##x##N##x##N(img,x,y,z,c,pP,T); pP+=N3; } \
        const int x0 = x - rsize1, y0 = y - rsize1, z0 = z - rsize1, x1 = x + rsize2, y1 = y + rsize2, z1 = z + rsize2; \
        float sum_weights = 0; \
        cimg_for_in##N##XYZ(res,x0,y0,z0,x1,y1,z1,p,q,r) if (cimg::abs(img(x,y,z,0) - img(p,q,r,0))<sigma_p3) { \
          T *pQ = Q._data; cimg_forC(res,c) { cimg_get##N##x##N##x##N(img,p,q,r,c,pQ,T); pQ+=N3; } \
          float distance2 = 0; \
          pQ = Q.end(); cimg_for(P,pP,T) { const float dI = (float)*pP - (float)*(--pQ); distance2+=dI*dI; } \
          distance2/=Pnorm; \
          const float dx = (float)p - x, dy = (float)q - y, dz = (float)r - z, \
            alldist = distance2 + (dx*dx + dy*dy + dz*dz)/sigma_s2, weight = alldist>3?0.0f:1.0f; \
          sum_weights+=weight; \
          cimg_forC(res,c) res(x,y,z,c)+=weight*(*this)(p,q,r,c); \
        } \
        if (sum_weights>0) cimg_forC(res,c) res(x,y,z,c)/=sum_weights; \
        else cimg_forC(res,c) res(x,y,z,c) = (Tfloat)((*this)(x,y,z,c)); \
    }

#define _cimg_blur_patch3d(N) \
      cimg_for##N##XYZ(res,x,y,z) { \
        T *pP = P._data; cimg_forC(res,c) { cimg_get##N##x##N##x##N(img,x,y,z,c,pP,T); pP+=N3; } \
        const int x0 = x - rsize1, y0 = y - rsize1, z0 = z - rsize1, x1 = x + rsize2, y1 = y + rsize2, z1 = z + rsize2; \
        float sum_weights = 0, weight_max = 0; \
        cimg_for_in##N##XYZ(res,x0,y0,z0,x1,y1,z1,p,q,r) if (p!=x || q!=y || r!=z) { \
          T *pQ = Q._data; cimg_forC(res,c) { cimg_get##N##x##N##x##N(img,p,q,r,c,pQ,T); pQ+=N3; } \
          float distance2 = 0; \
          pQ = Q.end(); cimg_for(P,pP,T) { const float dI = (float)*pP - (float)*(--pQ); distance2+=dI*dI; } \
          distance2/=Pnorm; \
          const float dx = (float)p - x, dy = (float)q - y, dz = (float)r - z, \
            alldist = distance2 + (dx*dx + dy*dy + dz*dz)/sigma_s2, weight = (float)std::exp(-alldist); \
          if (weight>weight_max) weight_max = weight; \
          sum_weights+=weight; \
          cimg_forC(res,c) res(x,y,z,c)+=weight*(*this)(p,q,r,c); \
        } \
        sum_weights+=weight_max; cimg_forC(res,c) res(x,y,z,c)+=weight_max*(*this)(x,y,z,c); \
        if (sum_weights>0) cimg_forC(res,c) res(x,y,z,c)/=sum_weights; \
        else cimg_forC(res,c) res(x,y,z,c) = (Tfloat)((*this)(x,y,z,c)); \
      }

#define _cimg_blur_patch2d_fast(N) \
        cimg_for##N##XY(res,x,y) { \
          T *pP = P._data; cimg_forC(res,c) { cimg_get##N##x##N(img,x,y,0,c,pP,T); pP+=N2; } \
          const int x0 = x - rsize1, y0 = y - rsize1, x1 = x + rsize2, y1 = y + rsize2; \
          float sum_weights = 0; \
          cimg_for_in##N##XY(res,x0,y0,x1,y1,p,q) if (cimg::abs(img(x,y,0,0) - img(p,q,0,0))<sigma_p3) { \
            T *pQ = Q._data; cimg_forC(res,c) { cimg_get##N##x##N(img,p,q,0,c,pQ,T); pQ+=N2; } \
            float distance2 = 0; \
            pQ = Q.end(); cimg_for(P,pP,T) { const float dI = (float)*pP - (float)*(--pQ); distance2+=dI*dI; } \
            distance2/=Pnorm; \
            const float dx = (float)p - x, dy = (float)q - y, \
              alldist = distance2 + (dx*dx+dy*dy)/sigma_s2, weight = alldist>3?0.0f:1.0f; \
            sum_weights+=weight; \
            cimg_forC(res,c) res(x,y,c)+=weight*(*this)(p,q,c); \
          } \
          if (sum_weights>0) cimg_forC(res,c) res(x,y,c)/=sum_weights; \
          else cimg_forC(res,c) res(x,y,c) = (Tfloat)((*this)(x,y,c)); \
        }

#define _cimg_blur_patch2d(N) \
        cimg_for##N##XY(res,x,y) { \
          T *pP = P._data; cimg_forC(res,c) { cimg_get##N##x##N(img,x,y,0,c,pP,T); pP+=N2; } \
          const int x0 = x - rsize1, y0 = y - rsize1, x1 = x + rsize2, y1 = y + rsize2; \
          float sum_weights = 0, weight_max = 0; \
          cimg_for_in##N##XY(res,x0,y0,x1,y1,p,q) if (p!=x || q!=y) { \
            T *pQ = Q._data; cimg_forC(res,c) { cimg_get##N##x##N(img,p,q,0,c,pQ,T); pQ+=N2; } \
            float distance2 = 0; \
            pQ = Q.end(); cimg_for(P,pP,T) { const float dI = (float)*pP - (float)*(--pQ); distance2+=dI*dI; } \
            distance2/=Pnorm; \
            const float dx = (float)p - x, dy = (float)q - y, \
              alldist = distance2 + (dx*dx+dy*dy)/sigma_s2, weight = (float)std::exp(-alldist); \
            if (weight>weight_max) weight_max = weight; \
            sum_weights+=weight; \
            cimg_forC(res,c) res(x,y,c)+=weight*(*this)(p,q,c); \
          } \
          sum_weights+=weight_max; cimg_forC(res,c) res(x,y,c)+=weight_max*(*this)(x,y,c); \
          if (sum_weights>0) cimg_forC(res,c) res(x,y,c)/=sum_weights; \
          else cimg_forC(res,c) res(x,y,c) = (Tfloat)((*this)(x,y,c)); \
    }

      CImg<Tfloat> res(_width,_height,_depth,_spectrum,0);
      const CImg<T> _img = smoothness>0?get_blur(smoothness):CImg<Tfloat>(),&img = smoothness>0?_img:*this;
      CImg<T> P(patch_size*patch_size*_spectrum), Q(P);
      const float
        nsigma_s = sigma_s>=0?sigma_s:-sigma_s*cimg::max(_width,_height,_depth)/100,
        sigma_s2 = nsigma_s*nsigma_s, sigma_p2 = sigma_p*sigma_p, sigma_p3 = 3*sigma_p,
        Pnorm = P.size()*sigma_p2;
      const int rsize2 = (int)lookup_size/2, rsize1 = (int)lookup_size - rsize2 - 1;
      const unsigned int N2 = patch_size*patch_size, N3 = N2*patch_size;
      if (_depth>1) switch (patch_size) { // 3d
      case 2 : if (fast_approx) _cimg_blur_patch3d_fast(2) else _cimg_blur_patch3d(2) break;
      case 3 : if (fast_approx) _cimg_blur_patch3d_fast(3) else _cimg_blur_patch3d(3) break;
      default : {
        const int psize2 = (int)patch_size/2, psize1 = (int)patch_size - psize2 - 1;
        if (fast_approx) cimg_forXYZ(res,x,y,z) { // Fast
          P = img.get_crop(x - psize1,y - psize1,z - psize1,x + psize2,y + psize2,z + psize2,true);
          const int x0 = x - rsize1, y0 = y - rsize1, z0 = z - rsize1, x1 = x + rsize2, y1 = y + rsize2, z1 = z + rsize2;
          float sum_weights = 0;
          cimg_for_inXYZ(res,x0,y0,z0,x1,y1,z1,p,q,r) if (cimg::abs(img(x,y,z,0)-img(p,q,r,0))<sigma_p3) {
            (Q = img.get_crop(p - psize1,q - psize1,r - psize1,p + psize2,q + psize2,r + psize2,true))-=P;
            const float
              dx = (float)x - p, dy = (float)y - q, dz = (float)z - r,
              distance2 = (float)(Q.pow(2).sum()/Pnorm + (dx*dx + dy*dy + dz*dz)/sigma_s2),
              weight = distance2>3?0.0f:1.0f;
            sum_weights+=weight;
            cimg_forC(res,c) res(x,y,z,c)+=weight*(*this)(p,q,r,c);
          }
          if (sum_weights>0) cimg_forC(res,c) res(x,y,z,c)/=sum_weights;
          else cimg_forC(res,c) res(x,y,z,c) = (Tfloat)((*this)(x,y,z,c));
        } else cimg_forXYZ(res,x,y,z) { // Exact
          P = img.get_crop(x - psize1,y - psize1,z - psize1,x + psize2,y + psize2,z + psize2,true);
          const int x0 = x - rsize1, y0 = y - rsize1, z0 = z - rsize1, x1 = x + rsize2, y1 = y + rsize2, z1 = z + rsize2;
          float sum_weights = 0, weight_max = 0;
          cimg_for_inXYZ(res,x0,y0,z0,x1,y1,z1,p,q,r) if (p!=x || q!=y || r!=z) {
            (Q = img.get_crop(p - psize1,q - psize1,r - psize1,p + psize2,q + psize2,r + psize2,true))-=P;
            const float
              dx = (float)x - p, dy = (float)y - q, dz = (float)z - r,
              distance2 = (float)(Q.pow(2).sum()/Pnorm + (dx*dx + dy*dy + dz*dz)/sigma_s2),
              weight = (float)std::exp(-distance2);
            if (weight>weight_max) weight_max = weight;
            sum_weights+=weight;
            cimg_forC(res,c) res(x,y,z,c)+=weight*(*this)(p,q,r,c);
          }
          sum_weights+=weight_max; cimg_forC(res,c) res(x,y,z,c)+=weight_max*(*this)(x,y,z,c);
          if (sum_weights>0) cimg_forC(res,c) res(x,y,z,c)/=sum_weights;
          else cimg_forC(res,c) res(x,y,z,c) = (Tfloat)((*this)(x,y,z,c));
        }
      }
      } else switch (patch_size) { // 2d
      case 2 : if (fast_approx) _cimg_blur_patch2d_fast(2) else _cimg_blur_patch2d(2) break;
      case 3 : if (fast_approx) _cimg_blur_patch2d_fast(3) else _cimg_blur_patch2d(3) break;
      case 4 : if (fast_approx) _cimg_blur_patch2d_fast(4) else _cimg_blur_patch2d(4) break;
      case 5 : if (fast_approx) _cimg_blur_patch2d_fast(5) else _cimg_blur_patch2d(5) break;
      case 6 : if (fast_approx) _cimg_blur_patch2d_fast(6) else _cimg_blur_patch2d(6) break;
      case 7 : if (fast_approx) _cimg_blur_patch2d_fast(7) else _cimg_blur_patch2d(7) break;
      case 8 : if (fast_approx) _cimg_blur_patch2d_fast(8) else _cimg_blur_patch2d(8) break;
      case 9 : if (fast_approx) _cimg_blur_patch2d_fast(9) else _cimg_blur_patch2d(9) break;
      default : { // Fast
        const int psize2 = (int)patch_size/2, psize1 = (int)patch_size - psize2 - 1;
        if (fast_approx) cimg_forXY(res,x,y) { // 2d fast approximation.
          P = img.get_crop(x - psize1,y - psize1,x + psize2,y + psize2,true);
          const int x0 = x - rsize1, y0 = y - rsize1, x1 = x + rsize2, y1 = y + rsize2;
          float sum_weights = 0;
          cimg_for_inXY(res,x0,y0,x1,y1,p,q) if (cimg::abs(img(x,y,0)-img(p,q,0))<sigma_p3) {
            (Q = img.get_crop(p - psize1,q - psize1,p + psize2,q + psize2,true))-=P;
            const float
              dx = (float)x - p, dy = (float)y - q,
              distance2 = (float)(Q.pow(2).sum()/Pnorm + (dx*dx + dy*dy)/sigma_s2),
              weight = distance2>3?0.0f:1.0f;
            sum_weights+=weight;
            cimg_forC(res,c) res(x,y,c)+=weight*(*this)(p,q,c);
          }
          if (sum_weights>0) cimg_forC(res,c) res(x,y,c)/=sum_weights;
          else cimg_forC(res,c) res(x,y,c) = (Tfloat)((*this)(x,y,c));
        } else cimg_forXY(res,x,y) { // 2d exact algorithm.
          P = img.get_crop(x - psize1,y - psize1,x + psize2,y + psize2,true);
          const int x0 = x - rsize1, y0 = y - rsize1, x1 = x + rsize2, y1 = y + rsize2;
          float sum_weights = 0, weight_max = 0;
          cimg_for_inXY(res,x0,y0,x1,y1,p,q) if (p!=x || q!=y) {
            (Q = img.get_crop(p - psize1,q - psize1,p + psize2,q + psize2,true))-=P;
            const float
              dx = (float)x - p, dy = (float)y - q,
              distance2 = (float)(Q.pow(2).sum()/Pnorm + (dx*dx + dy*dy)/sigma_s2),
              weight = (float)std::exp(-distance2);
            if (weight>weight_max) weight_max = weight;
            sum_weights+=weight;
            cimg_forC(res,c) res(x,y,c)+=weight*(*this)(p,q,c);
          }
          sum_weights+=weight_max; cimg_forC(res,c) res(x,y,c)+=weight_max*(*this)(x,y,c);
          if (sum_weights>0) cimg_forC(res,c) res(x,y,c)/=sum_weights;
          else cimg_forC(res,c) res(x,y,0,c) = (Tfloat)((*this)(x,y,c));
        }
      }
      }
      return res;
    }

    //! Apply a median filter.
    CImg<T>& blur_median(const unsigned int n) {
      if (!n) return *this;
      return get_blur_median(n).move_to(*this);
    }

    CImg<T> get_blur_median(const unsigned int n) const {
      if (is_empty() || n<=1) return *this;
      CImg<T> res(_width,_height,_depth,_spectrum);
      T *ptrd = res._data;
      const int hl = n/2, hr = hl - 1 + n%2;
      if (res._depth!=1) cimg_forXYZC(*this,x,y,z,c) { // 3d
        const int
          x0 = x - hl, y0 = y - hl, z0 = z-hl, x1 = x + hr, y1 = y + hr, z1 = z+hr,
          nx0 = x0<0?0:x0, ny0 = y0<0?0:y0, nz0 = z0<0?0:z0,
          nx1 = x1>=width()?width()-1:x1, ny1 = y1>=height()?height()-1:y1, nz1 = z1>=depth()?depth()-1:z1;
        *(ptrd++) = get_crop(nx0,ny0,nz0,c,nx1,ny1,nz1,c).median();
      } else {
#define _cimg_median_sort(a,b) if ((a)>(b)) cimg::swap(a,b)
        if (res._height!=1) switch (n) { // 2d
        case 3 : {
          T I[9] = { 0 };
          CImg_3x3(J,T);
          cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,T) {
            std::memcpy(J,I,9*sizeof(T));
            _cimg_median_sort(Jcp, Jnp); _cimg_median_sort(Jcc, Jnc); _cimg_median_sort(Jcn, Jnn);
            _cimg_median_sort(Jpp, Jcp); _cimg_median_sort(Jpc, Jcc); _cimg_median_sort(Jpn, Jcn);
            _cimg_median_sort(Jcp, Jnp); _cimg_median_sort(Jcc, Jnc); _cimg_median_sort(Jcn, Jnn);
            _cimg_median_sort(Jpp, Jpc); _cimg_median_sort(Jnc, Jnn); _cimg_median_sort(Jcc, Jcn);
            _cimg_median_sort(Jpc, Jpn); _cimg_median_sort(Jcp, Jcc); _cimg_median_sort(Jnp, Jnc);
            _cimg_median_sort(Jcc, Jcn); _cimg_median_sort(Jcc, Jnp); _cimg_median_sort(Jpn, Jcc);
            _cimg_median_sort(Jcc, Jnp);
            *(ptrd++) = Jcc;
          }
        } break;
        case 5 : {
          T I[25] = { 0 };
          CImg_5x5(J,T);
          cimg_forC(*this,c) cimg_for5x5(*this,x,y,0,c,I,T) {
            std::memcpy(J,I,25*sizeof(T));
            _cimg_median_sort(Jbb, Jpb); _cimg_median_sort(Jnb, Jab); _cimg_median_sort(Jcb, Jab); _cimg_median_sort(Jcb, Jnb);
            _cimg_median_sort(Jpp, Jcp); _cimg_median_sort(Jbp, Jcp); _cimg_median_sort(Jbp, Jpp); _cimg_median_sort(Jap, Jbc);
            _cimg_median_sort(Jnp, Jbc); _cimg_median_sort(Jnp, Jap); _cimg_median_sort(Jcc, Jnc); _cimg_median_sort(Jpc, Jnc);
            _cimg_median_sort(Jpc, Jcc); _cimg_median_sort(Jbn, Jpn); _cimg_median_sort(Jac, Jpn); _cimg_median_sort(Jac, Jbn);
            _cimg_median_sort(Jnn, Jan); _cimg_median_sort(Jcn, Jan); _cimg_median_sort(Jcn, Jnn); _cimg_median_sort(Jpa, Jca);
            _cimg_median_sort(Jba, Jca); _cimg_median_sort(Jba, Jpa); _cimg_median_sort(Jna, Jaa); _cimg_median_sort(Jcb, Jbp);
            _cimg_median_sort(Jnb, Jpp); _cimg_median_sort(Jbb, Jpp); _cimg_median_sort(Jbb, Jnb); _cimg_median_sort(Jab, Jcp);
            _cimg_median_sort(Jpb, Jcp); _cimg_median_sort(Jpb, Jab); _cimg_median_sort(Jpc, Jac); _cimg_median_sort(Jnp, Jac);
            _cimg_median_sort(Jnp, Jpc); _cimg_median_sort(Jcc, Jbn); _cimg_median_sort(Jap, Jbn); _cimg_median_sort(Jap, Jcc);
            _cimg_median_sort(Jnc, Jpn); _cimg_median_sort(Jbc, Jpn); _cimg_median_sort(Jbc, Jnc); _cimg_median_sort(Jba, Jna);
            _cimg_median_sort(Jcn, Jna); _cimg_median_sort(Jcn, Jba); _cimg_median_sort(Jpa, Jaa); _cimg_median_sort(Jnn, Jaa);
            _cimg_median_sort(Jnn, Jpa); _cimg_median_sort(Jan, Jca); _cimg_median_sort(Jnp, Jcn); _cimg_median_sort(Jap, Jnn);
            _cimg_median_sort(Jbb, Jnn); _cimg_median_sort(Jbb, Jap); _cimg_median_sort(Jbc, Jan); _cimg_median_sort(Jpb, Jan);
            _cimg_median_sort(Jpb, Jbc); _cimg_median_sort(Jpc, Jba); _cimg_median_sort(Jcb, Jba); _cimg_median_sort(Jcb, Jpc);
            _cimg_median_sort(Jcc, Jpa); _cimg_median_sort(Jnb, Jpa); _cimg_median_sort(Jnb, Jcc); _cimg_median_sort(Jnc, Jca);
            _cimg_median_sort(Jab, Jca); _cimg_median_sort(Jab, Jnc); _cimg_median_sort(Jac, Jna); _cimg_median_sort(Jbp, Jna);
            _cimg_median_sort(Jbp, Jac); _cimg_median_sort(Jbn, Jaa); _cimg_median_sort(Jpp, Jaa); _cimg_median_sort(Jpp, Jbn);
            _cimg_median_sort(Jcp, Jpn); _cimg_median_sort(Jcp, Jan); _cimg_median_sort(Jnc, Jpa); _cimg_median_sort(Jbn, Jna);
            _cimg_median_sort(Jcp, Jnc); _cimg_median_sort(Jcp, Jbn); _cimg_median_sort(Jpb, Jap); _cimg_median_sort(Jnb, Jpc);
            _cimg_median_sort(Jbp, Jcn); _cimg_median_sort(Jpc, Jcn); _cimg_median_sort(Jap, Jcn); _cimg_median_sort(Jab, Jbc);
            _cimg_median_sort(Jpp, Jcc); _cimg_median_sort(Jcp, Jac); _cimg_median_sort(Jab, Jpp); _cimg_median_sort(Jab, Jcp);
            _cimg_median_sort(Jcc, Jac); _cimg_median_sort(Jbc, Jac); _cimg_median_sort(Jpp, Jcp); _cimg_median_sort(Jbc, Jcc);
            _cimg_median_sort(Jpp, Jbc); _cimg_median_sort(Jpp, Jcn); _cimg_median_sort(Jcc, Jcn); _cimg_median_sort(Jcp, Jcn);
            _cimg_median_sort(Jcp, Jbc); _cimg_median_sort(Jcc, Jnn); _cimg_median_sort(Jcp, Jcc); _cimg_median_sort(Jbc, Jnn);
            _cimg_median_sort(Jcc, Jba); _cimg_median_sort(Jbc, Jba); _cimg_median_sort(Jbc, Jcc);
            *(ptrd++) = Jcc;
          }
        } break;
        default : {
          cimg_forXYC(*this,x,y,c) {
            const int
              x0 = x - hl, y0 = y - hl, x1 = x + hr, y1 = y + hr,
              nx0 = x0<0?0:x0, ny0 = y0<0?0:y0,
              nx1 = x1>=width()?width()-1:x1, ny1 = y1>=height()?height()-1:y1;
            *(ptrd++) = get_crop(nx0,ny0,0,c,nx1,ny1,0,c).median();
          }
        }
        } else switch (n) { // 1d
        case 2 : {
          T I[4] = { 0 };
          cimg_forC(*this,c) cimg_for2x2(*this,x,y,0,c,I,T) *(ptrd++) = (T)(0.5f*(I[0]+I[1]));
        } break;
        case 3 : {
          T I[9] = { 0 };
          cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,T)
            *(ptrd++) = I[3]<I[4]?(I[4]<I[5]?I[4]:(I[3]<I[5]?I[5]:I[3])):(I[3]<I[5]?I[3]:(I[4]<I[5]?I[5]:I[4]));
        } break;
        default : {
          cimg_forXC(*this,x,c) {
            const int
              x0 = x - hl, x1 = x + hr,
              nx0 = x0<0?0:x0, nx1 = x1>=width()?width()-1:x1;
            *(ptrd++) = get_crop(nx0,0,0,c,nx1,0,0,c).median();
          }
        }
        }
      }
      return res;
    }

    //! Sharpen image using anisotropic shock filters or inverse diffusion.
    CImg<T>& sharpen(const float amplitude, const bool sharpen_type=false, const float edge=1, const float alpha=0, const float sigma=0) {
      if (is_empty()) return *this;
      T val_min, val_max = max_min(val_min);
      const float nedge = edge/2;
      CImg<Tfloat> val, vec, velocity(_width,_height,_depth,_spectrum);
      Tfloat *ptrd = velocity._data, veloc_max = 0;

      if (_depth>1) { // 3d
        CImg_3x3x3(I,Tfloat);
        if (sharpen_type) { // Shock filters.
          CImg<Tfloat> G = (alpha>0?get_blur(alpha).get_structure_tensors():get_structure_tensors());
          if (sigma>0) G.blur(sigma);
          Tfloat *ptrG0 = G.data(0,0,0,0), *ptrG1 = G.data(0,0,0,1), *ptrG2 = G.data(0,0,0,2), *ptrG3 = G.data(0,0,0,3);
          cimg_forXYZ(G,x,y,z) {
            G.get_tensor_at(x,y,z).symmetric_eigen(val,vec);
            if (val[0]<0) val[0] = 0;
            if (val[1]<0) val[1] = 0;
            if (val[2]<0) val[2] = 0;
            *(ptrG0++) = vec(0,0);
            *(ptrG1++) = vec(0,1);
            *(ptrG2++) = vec(0,2);
            *(ptrG3++) = 1 - (Tfloat)std::pow(1+val[0]+val[1]+val[2],-(Tfloat)nedge);
          }
          cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
            const Tfloat
              u = G(x,y,z,0),
              v = G(x,y,z,1),
              w = G(x,y,z,2),
              amp = G(x,y,z,3),
              ixx = Incc + Ipcc - 2*Iccc,
              ixy = (Innc + Ippc - Inpc - Ipnc)/4,
              ixz = (Incn + Ipcp - Incp - Ipcn)/4,
              iyy = Icnc + Icpc - 2*Iccc,
              iyz = (Icnn + Icpp - Icnp - Icpn)/4,
              izz = Iccn + Iccp - 2*Iccc,
              ixf = Incc - Iccc,
              ixb = Iccc - Ipcc,
              iyf = Icnc - Iccc,
              iyb = Iccc - Icpc,
              izf = Iccn - Iccc,
              izb = Iccc - Iccp,
              itt = u*u*ixx + v*v*iyy + w*w*izz + 2*u*v*ixy + 2*u*w*ixz + 2*v*w*iyz,
              it = u*cimg::minmod(ixf,ixb) + v*cimg::minmod(iyf,iyb) + w*cimg::minmod(izf,izb),
              veloc = -amp*cimg::sign(itt)*cimg::abs(it);
            *(ptrd++) = veloc;
            if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
          }
        } else cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) { // Inverse diffusion.
          const Tfloat veloc = -Ipcc - Incc - Icpc - Icnc - Iccp - Iccn + 6*Iccc;
          *(ptrd++) = veloc;
          if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
        }
      } else {
        CImg_3x3(I,Tfloat);
        if (sharpen_type) { // Shock filters.
          CImg<Tfloat> G = (alpha>0?get_blur(alpha).get_structure_tensors():get_structure_tensors());
          if (sigma>0) G.blur(sigma);
          Tfloat *ptrG0 = G.data(0,0,0,0), *ptrG1 = G.data(0,0,0,1), *ptrG2 = G.data(0,0,0,2);
          cimg_forXY(G,x,y) {
            G.get_tensor_at(x,y).symmetric_eigen(val,vec);
            if (val[0]<0) val[0] = 0;
            if (val[1]<0) val[1] = 0;
            *(ptrG0++) = vec(0,0);
            *(ptrG1++) = vec(0,1);
            *(ptrG2++) = 1 - (Tfloat)std::pow(1 + val[0] + val[1],-(Tfloat)nedge);
          }
          cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,Tfloat) {
            const Tfloat
              u = G(x,y,0),
              v = G(x,y,1),
              amp = G(x,y,2),
              ixx = Inc + Ipc - 2*Icc,
              ixy = (Inn + Ipp - Inp - Ipn)/4,
              iyy = Icn + Icp - 2*Icc,
              ixf = Inc - Icc,
              ixb = Icc - Ipc,
              iyf = Icn - Icc,
              iyb = Icc - Icp,
              itt = u*u*ixx + v*v*iyy + 2*u*v*ixy,
              it = u*cimg::minmod(ixf,ixb) + v*cimg::minmod(iyf,iyb),
              veloc = -amp*cimg::sign(itt)*cimg::abs(it);
            *(ptrd++) = veloc;
            if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
          }
        } else cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,Tfloat) { // Inverse diffusion.
          const Tfloat veloc = -Ipc - Inc - Icp - Icn + 4*Icc;
          *(ptrd++) = veloc;
          if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
        }
      }
      if (veloc_max<=0) return *this;
      return ((velocity*=amplitude/veloc_max)+=*this).cut(val_min,val_max).move_to(*this);
    }

    CImg<T> get_sharpen(const float amplitude, const bool sharpen_type=false, const float edge=1, const float alpha=0, const float sigma=0) const {
      return (+*this).sharpen(amplitude,sharpen_type,edge,alpha,sigma);
    }

    //! Compute the list of images, corresponding to the XY-gradients of an image.
    /**
       \param scheme = Numerical scheme used for the gradient computation :
       - -1 = Backward finite differences
       - 0 = Centered finite differences
       - 1 = Forward finite differences
       - 2 = Using Sobel masks
       - 3 = Using rotation invariant masks
       - 4 = Using Deriche recusrsive filter.
    **/
    CImgList<Tfloat> get_gradient(const char *const axes=0, const int scheme=3) const {
      CImgList<Tfloat> grad(2,_width,_height,_depth,_spectrum);
      Tfloat *ptrd0 = grad[0]._data, *ptrd1 = grad[1]._data;
      bool is_3d = false;
      if (axes) {
        for (unsigned int a = 0; axes[a]; ++a) {
          const char axis = cimg::uncase(axes[a]);
          switch (axis) {
          case 'x' : case 'y' : break;
          case 'z' : is_3d = true; break;
          default :
            throw CImgArgumentException(_cimg_instance
                                        "get_gradient() : Invalid specified axis '%c'.",
                                        cimg_instance,
                                        axis);
          }
        }
      } else is_3d = (_depth>1);
      if (is_3d) {
        CImg<Tfloat>(_width,_height,_depth,_spectrum).move_to(grad);
        Tfloat *ptrd2 = grad[2]._data;
        switch (scheme) { // 3d.
        case -1 : { // Backward finite differences.
          CImg_3x3x3(I,Tfloat);
          cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
            *(ptrd0++) = Iccc - Ipcc;
            *(ptrd1++) = Iccc - Icpc;
            *(ptrd2++) = Iccc - Iccp;
          }
        } break;
        case 1 : { // Forward finite differences.
          CImg_2x2x2(I,Tfloat);
          cimg_forC(*this,c) cimg_for2x2x2(*this,x,y,z,c,I,Tfloat) {
            *(ptrd0++) = Incc - Iccc;
            *(ptrd1++) = Icnc - Iccc;
            *(ptrd2++) = Iccn - Iccc;
          }
        } break;
        case 4 : { // Using Deriche filter with low standard variation.
          grad[0] = get_deriche(0,1,'x');
          grad[1] = get_deriche(0,1,'y');
          grad[2] = get_deriche(0,1,'z');
        } break;
        default : { // Central finite differences.
          CImg_3x3x3(I,Tfloat);
          cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
            *(ptrd0++) = (Incc - Ipcc)/2;
            *(ptrd1++) = (Icnc - Icpc)/2;
            *(ptrd2++) = (Iccn - Iccp)/2;
          }
        }
        }
      } else switch (scheme) { // 2d.
      case -1 : { // Backward finite differences.
        CImg_3x3(I,Tfloat);
        cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
          *(ptrd0++) = Icc - Ipc;
          *(ptrd1++) = Icc - Icp;
        }
      } break;
      case 1 : { // Forward finite differences.
        CImg_2x2(I,Tfloat);
        cimg_forZC(*this,z,c) cimg_for2x2(*this,x,y,z,c,I,Tfloat) {
          *(ptrd0++) = Inc - Icc;
          *(ptrd1++) = Icn - Icc;
        }
      } break;
      case 2 : { // Sobel scheme.
        CImg_3x3(I,Tfloat);
        const Tfloat a = 1, b = 2;
        cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
          *(ptrd0++) = -a*Ipp - b*Ipc - a*Ipn + a*Inp + b*Inc + a*Inn;
          *(ptrd1++) = -a*Ipp - b*Icp - a*Inp + a*Ipn + b*Icn + a*Inn;
        }
      } break;
      case 3 : { // Rotation invariant mask.
        CImg_3x3(I,Tfloat);
        const Tfloat a = (Tfloat)(0.25f*(2-std::sqrt(2.0f))), b = (Tfloat)(0.5f*(std::sqrt(2.0f)-1));
        cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
          *(ptrd0++) = -a*Ipp - b*Ipc - a*Ipn + a*Inp + b*Inc + a*Inn;
          *(ptrd1++) = -a*Ipp - b*Icp - a*Inp + a*Ipn + b*Icn + a*Inn;
        }
      } break;
      case 4 : { // using Deriche filter with low standard variation
        grad[0] = get_deriche(0,1,'x');
        grad[1] = get_deriche(0,1,'y');
      } break;
      default : { // central finite differences
        CImg_3x3(I,Tfloat);
        cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,Tfloat) {
          *(ptrd0++) = (Inc - Ipc)/2;
          *(ptrd1++) = (Icn - Icp)/2;
        }
      }
      }
      if (!axes) return grad;
      CImgList<Tfloat> res;
      for (unsigned int l = 0; axes[l]; ++l) {
        const char axis = cimg::uncase(axes[l]);
        switch (axis) {
        case 'x' : res.insert(grad[0]); break;
        case 'y' : res.insert(grad[1]); break;
        case 'z' : res.insert(grad[2]); break;
        }
      }
      grad.assign();
      return res;
    }

    //! Get components of the Hessian matrix of an image.
    CImgList<Tfloat> get_hessian(const char *const axes=0) const {
      CImgList<Tfloat> res;
      const char *naxes = axes, *const def_axes2d = "xxxyyy", *const def_axes3d = "xxxyxzyyyzzz";
      if (!axes) naxes = _depth>1?def_axes3d:def_axes2d;
      const unsigned int lmax = std::strlen(naxes);
      if (lmax%2)
        throw CImgArgumentException(_cimg_instance
                                    "get_hessian() : Invalid specified axes '%s'.",
                                    cimg_instance,
                                    naxes);

      res.assign(lmax/2,_width,_height,_depth,_spectrum);
      if (!cimg::strcasecmp(naxes,def_axes3d)) { // 3d
        Tfloat
          *ptrd0 = res[0]._data, *ptrd1 = res[1]._data, *ptrd2 = res[2]._data,
          *ptrd3 = res[3]._data, *ptrd4 = res[4]._data, *ptrd5 = res[5]._data;
        CImg_3x3x3(I,Tfloat);
        cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
          *(ptrd0++) = Ipcc + Incc - 2*Iccc;          // Ixx
          *(ptrd1++) = (Ippc + Innc - Ipnc - Inpc)/4; // Ixy
          *(ptrd2++) = (Ipcp + Incn - Ipcn - Incp)/4; // Ixz
          *(ptrd3++) = Icpc + Icnc - 2*Iccc;          // Iyy
          *(ptrd4++) = (Icpp + Icnn - Icpn - Icnp)/4; // Iyz
          *(ptrd5++) = Iccn + Iccp - 2*Iccc;          // Izz
        }
      } else if (!cimg::strcasecmp(naxes,def_axes2d)) { // 2d
        Tfloat *ptrd0 = res[0]._data, *ptrd1 = res[1]._data, *ptrd2 = res[2]._data;
        CImg_3x3(I,Tfloat);
        cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,Tfloat) {
          *(ptrd0++) = Ipc + Inc - 2*Icc;         // Ixx
          *(ptrd1++) = (Ipp + Inn - Ipn - Inp)/4; // Ixy
          *(ptrd2++) = Icp + Icn - 2*Icc;         // Iyy
        }
      } else for (unsigned int l = 0; l<lmax; ) { // Version with custom axes.
        const unsigned int l2 = l/2;
          char axis1 = naxes[l++], axis2 = naxes[l++];
          if (axis1>axis2) cimg::swap(axis1,axis2);
          bool valid_axis = false;
          Tfloat *ptrd = res[l2]._data;
          if (axis1=='x' && axis2=='x') { // Ixx
            valid_axis = true; CImg_3x3(I,Tfloat);
            cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = Ipc + Inc - 2*Icc;
          }
          else if (axis1=='x' && axis2=='y') { // Ixy
            valid_axis = true; CImg_3x3(I,Tfloat);
            cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = (Ipp + Inn - Ipn - Inp)/4;
          }
          else if (axis1=='x' && axis2=='z') { // Ixz
            valid_axis = true; CImg_3x3x3(I,Tfloat);
            cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = (Ipcp + Incn - Ipcn - Incp)/4;
          }
          else if (axis1=='y' && axis2=='y') { // Iyy
            valid_axis = true; CImg_3x3(I,Tfloat);
            cimg_forZC(*this,z,c) cimg_for3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = Icp + Icn - 2*Icc;
          }
          else if (axis1=='y' && axis2=='z') { // Iyz
            valid_axis = true; CImg_3x3x3(I,Tfloat);
            cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = (Icpp + Icnn - Icpn - Icnp)/4;
          }
          else if (axis1=='z' && axis2=='z') { // Izz
            valid_axis = true; CImg_3x3x3(I,Tfloat);
            cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) *(ptrd++) = Iccn + Iccp - 2*Iccc;
          }
          else if (!valid_axis)
            throw CImgArgumentException(_cimg_instance
                                        "get_hessian() : Invalid specified axes '%s'.",
                                        cimg_instance,
                                        naxes);
        }
      return res;
    }

    //! Compute the laplacian of the instance image.
    CImg<T>& laplacian() {
      return get_laplacian().move_to(*this);
    }

    CImg<Tfloat> get_laplacian() const {
      if (is_empty()) return CImg<Tfloat>();
      CImg<Tfloat> res(_width,_height,_depth,_spectrum);
      Tfloat *ptrd = res._data;
      if (_depth>1) { // 3d
        CImg_3x3x3(I,Tfloat);
        cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat)
          *(ptrd++) = Incc + Ipcc + Icnc + Icpc + Iccn + Iccp - 6*Iccc;
      } else if (_height>1) { // 2d
        CImg_3x3(I,Tfloat);
        cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,Tfloat)
          *(ptrd++) = Inc + Ipc + Icn + Icp - 4*Icc;
      } else { // 1d
        CImg_3x3(I,Tfloat);
        cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,Tfloat)
          *(ptrd++) = Inc + Ipc - 2*Icc;
      }
      return res;
    }

    //! Compute the structure tensor field of an image.
    CImg<T>& structure_tensors(const unsigned int scheme=2) {
      return get_structure_tensors(scheme).move_to(*this);
    }

    CImg<Tfloat> get_structure_tensors(const unsigned int scheme=2) const {
      if (is_empty()) return *this;
      CImg<Tfloat> res;
      if (_depth>1) { // 3d
        res.assign(_width,_height,_depth,6,0);
        CImg_3x3x3(I,Tfloat);
        switch (scheme) {
        case 0 : { // classical central finite differences
          cimg_forC(*this,c) {
            Tfloat
              *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2),
              *ptrd3 = res.data(0,0,0,3), *ptrd4 = res.data(0,0,0,4), *ptrd5 = res.data(0,0,0,5);
            cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
              const Tfloat
                ix = (Incc - Ipcc)/2,
                iy = (Icnc - Icpc)/2,
                iz = (Iccn - Iccp)/2;
              *(ptrd0++)+=ix*ix;
              *(ptrd1++)+=ix*iy;
              *(ptrd2++)+=ix*iz;
              *(ptrd3++)+=iy*iy;
              *(ptrd4++)+=iy*iz;
              *(ptrd5++)+=iz*iz;
            }
          }
        } break;
        case 1 : { // Forward/backward finite differences (version 1).
          cimg_forC(*this,c) {
            Tfloat
              *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2),
              *ptrd3 = res.data(0,0,0,3), *ptrd4 = res.data(0,0,0,4), *ptrd5 = res.data(0,0,0,5);
            cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
              const Tfloat
                ixf = Incc - Iccc, ixb = Iccc - Ipcc,
                iyf = Icnc - Iccc, iyb = Iccc - Icpc,
                izf = Iccn - Iccc, izb = Iccc - Iccp;
              *(ptrd0++)+=(ixf*ixf + ixf*ixb + ixb*ixf + ixb*ixb)/4;
              *(ptrd1++)+=(ixf*iyf + ixf*iyb + ixb*iyf + ixb*iyb)/4;
              *(ptrd2++)+=(ixf*izf + ixf*izb + ixb*izf + ixb*izb)/4;
              *(ptrd3++)+=(iyf*iyf + iyf*iyb + iyb*iyf + iyb*iyb)/4;
              *(ptrd4++)+=(iyf*izf + iyf*izb + iyb*izf + iyb*izb)/4;
              *(ptrd5++)+=(izf*izf + izf*izb + izb*izf + izb*izb)/4;
            }
          }
        } break;
        default : { // Forward/backward finite differences (version 2).
          cimg_forC(*this,c) {
            Tfloat
              *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2),
              *ptrd3 = res.data(0,0,0,3), *ptrd4 = res.data(0,0,0,4), *ptrd5 = res.data(0,0,0,5);
            cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) {
              const Tfloat
                ixf = Incc - Iccc, ixb = Iccc - Ipcc,
                iyf = Icnc - Iccc, iyb = Iccc - Icpc,
                izf = Iccn - Iccc, izb = Iccc - Iccp;
              *(ptrd0++)+=(ixf*ixf + ixb*ixb)/2;
              *(ptrd1++)+=(ixf*iyf + ixf*iyb + ixb*iyf + ixb*iyb)/4;
              *(ptrd2++)+=(ixf*izf + ixf*izb + ixb*izf + ixb*izb)/4;
              *(ptrd3++)+=(iyf*iyf + iyb*iyb)/2;
              *(ptrd4++)+=(iyf*izf + iyf*izb + iyb*izf + iyb*izb)/4;
              *(ptrd5++)+=(izf*izf + izb*izb)/2;
            }
          }
        } break;
        }
      } else { // 2d
        res.assign(_width,_height,_depth,3,0);
        CImg_3x3(I,Tfloat);
        switch (scheme) {
        case 0 : { // classical central finite differences
          cimg_forC(*this,c) {
            Tfloat *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2);
            cimg_for3x3(*this,x,y,0,c,I,Tfloat) {
              const Tfloat
                ix = (Inc - Ipc)/2,
                iy = (Icn - Icp)/2;
              *(ptrd0++)+=ix*ix;
              *(ptrd1++)+=ix*iy;
              *(ptrd2++)+=iy*iy;
            }
          }
        } break;
        case 1 : { // Forward/backward finite differences (version 1).
          cimg_forC(*this,c) {
            Tfloat *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2);
            cimg_for3x3(*this,x,y,0,c,I,Tfloat) {
              const Tfloat
                ixf = Inc - Icc, ixb = Icc - Ipc,
                iyf = Icn - Icc, iyb = Icc - Icp;
              *(ptrd0++)+=(ixf*ixf + ixf*ixb + ixb*iyf + ixb*ixb)/4;
              *(ptrd1++)+=(ixf*iyf + ixf*iyb + ixb*iyf + ixb*iyb)/4;
              *(ptrd2++)+=(iyf*iyf + iyf*iyb + iyb*iyf + iyb*iyb)/4;
            }
          }
        } break;
        default : { // Forward/backward finite differences (version 2).
          cimg_forC(*this,c) {
            Tfloat *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2);
            cimg_for3x3(*this,x,y,0,c,I,Tfloat) {
              const Tfloat
                ixf = Inc - Icc, ixb = Icc - Ipc,
                iyf = Icn - Icc, iyb = Icc - Icp;
              *(ptrd0++)+=(ixf*ixf + ixb*ixb)/2;
              *(ptrd1++)+=(ixf*iyf + ixf*iyb + ixb*iyf + ixb*iyb)/4;
              *(ptrd2++)+=(iyf*iyf + iyb*iyb)/2;
            }
          }
        } break;
        }
      }
      return res;
    }

    //! Get a diffusion tensor for edge-preserving anisotropic smoothing of an image.
    CImg<T>& edge_tensors(const float sharpness=0.7f, const float anisotropy=0.6f,
                          const float alpha=0.6f, const float sigma=1.1f, const bool is_sqrt=false) {
      CImg<Tfloat> res;
      const float nsharpness = cimg::max(sharpness,1e-5f), power1 = (is_sqrt?0.5f:1)*nsharpness, power2 = power1/(1e-7f+1-anisotropy);
      blur(alpha).normalize(0,(T)255);

      if (_depth>1) { // 3d
        CImg<floatT> val(3), vec(3,3);
        get_structure_tensors().move_to(res).blur(sigma);
        Tfloat
          *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2),
          *ptrd3 = res.data(0,0,0,3), *ptrd4 = res.data(0,0,0,4), *ptrd5 = res.data(0,0,0,5);
        cimg_forXYZ(*this,x,y,z) {
          res.get_tensor_at(x,y,z).symmetric_eigen(val,vec);
          const float
            _l1 = val[2], _l2 = val[1], _l3 = val[0],
            l1 = _l1>0?_l1:0, l2 = _l2>0?_l2:0, l3 = _l3>0?_l3:0,
            ux = vec(0,0), uy = vec(0,1), uz = vec(0,2),
            vx = vec(1,0), vy = vec(1,1), vz = vec(1,2),
            wx = vec(2,0), wy = vec(2,1), wz = vec(2,2),
            n1 = (float)std::pow(1+l1+l2+l3,-power1),
            n2 = (float)std::pow(1+l1+l2+l3,-power2);
          *(ptrd0++) = n1*(ux*ux + vx*vx) + n2*wx*wx;
          *(ptrd1++) = n1*(ux*uy + vx*vy) + n2*wx*wy;
          *(ptrd2++) = n1*(ux*uz + vx*vz) + n2*wx*wz;
          *(ptrd3++) = n1*(uy*uy + vy*vy) + n2*wy*wy;
          *(ptrd4++) = n1*(uy*uz + vy*vz) + n2*wy*wz;
          *(ptrd5++) = n1*(uz*uz + vz*vz) + n2*wz*wz;
        }
      } else { // for 2d images
        CImg<floatT> val(2), vec(2,2);
        get_structure_tensors().move_to(res).blur(sigma);
        Tfloat *ptrd0 = res.data(0,0,0,0), *ptrd1 = res.data(0,0,0,1), *ptrd2 = res.data(0,0,0,2);
        cimg_forXY(*this,x,y) {
          res.get_tensor_at(x,y).symmetric_eigen(val,vec);
          const float
            _l1 = val[1], _l2 = val[0],
            l1 = _l1>0?_l1:0, l2 = _l2>0?_l2:0,
            ux = vec(1,0), uy = vec(1,1),
            vx = vec(0,0), vy = vec(0,1),
            n1 = (float)std::pow(1+l1+l2,-power1),
            n2 = (float)std::pow(1+l1+l2,-power2);
          *(ptrd0++) = n1*ux*ux + n2*vx*vx;
          *(ptrd1++) = n1*ux*uy + n2*vx*vy;
          *(ptrd2++) = n1*uy*uy + n2*vy*vy;
        }
      }
      return res.move_to(*this);
    }

    CImg<Tfloat> get_edge_tensors(const float sharpness=0.7f, const float anisotropy=0.6f,
                                  const float alpha=0.6f, const float sigma=1.1f, const bool is_sqrt=false) const {
      return CImg<Tfloat>(*this,false).edge_tensors(sharpness,anisotropy,alpha,sigma,is_sqrt);
    }

    //! Estimate a displacement field between specified source image and instance image.
    /**
       \param is_backward : if false, match I2(X+U(X)) = I1(X), else match I2(X) = I1(X-U(X)).
    **/
    CImg<T>& displacement(const CImg<T>& source, const float smooth=0.1f, const float precision=5.0f,
                          const unsigned int nb_scales=0, const unsigned int iteration_max=10000,
                          const bool is_backward = false) {
      return get_displacement(source,smooth,precision,nb_scales,iteration_max,is_backward).move_to(*this);
    }

    CImg<Tfloat> get_displacement(const CImg<T>& source,
                                  const float smoothness=0.1f, const float precision=5.0f,
                                  const unsigned int nb_scales=0, const unsigned int iteration_max=10000,
                                  const bool is_backward = false) const {
      if (is_empty() || !source) return *this;
      if (!is_sameXYZC(source))
        throw CImgArgumentException(_cimg_instance
                                    "displacement() : Instance and source image (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    source._width,source._height,source._depth,source._spectrum,source._data);
      if (smoothness<0)
        throw CImgArgumentException(_cimg_instance
                                    "displacement() : Invalid specified smoothness %g "
                                    "(should be >=0)",
                                    cimg_instance,
                                    smoothness);
      if (precision<0)
        throw CImgArgumentException(_cimg_instance
                                    "displacement() : Invalid specified precision %g "
                                    "(should be >=0)",
                                    cimg_instance,
                                    precision);
      const unsigned int _nb_scales = nb_scales>0?nb_scales:(unsigned int)(2*std::log((double)(cimg::max(_width,_height))));
      const float _precision = (float)std::pow(10.0,-(double)precision);
      float sm, sM = source.max_min(sm), tm, tM = max_min(tm);
      const float sdelta = sm==sM?1:(sM - sm), tdelta = tm==tM?1:(tM - tm);
      const bool is_3d = source._depth>1;
      CImg<floatT> U;

      for (int scale = _nb_scales-1; scale>=0; --scale) {
        const float factor = (float)std::pow(1.5,(double)scale);
        const unsigned int
          _sw = (unsigned int)(_width/factor), sw = _sw?_sw:1,
          _sh = (unsigned int)(_height/factor), sh = _sh?_sh:1,
          _sd = (unsigned int)(_depth/factor), sd = _sd?_sd:1;
        const CImg<Tfloat>
          I1 = (source.get_resize(sw,sh,sd,-100,2)-=sm)/=sdelta,
          I2 = (get_resize(I1,2)-=tm)/=tdelta;
        if (U) (U*=1.5f).resize(I2._width,I2._height,I2._depth,-100,3);
        else U.assign(I2._width,I2._height,I2._depth,is_3d?3:2,0);
        float dt = 2, energy = cimg::type<float>::max();
        const CImgList<Tfloat> dI = is_backward?I1.get_gradient():I2.get_gradient();

        for (unsigned int iteration = 0; iteration<iteration_max; ++iteration) {
          float _energy = 0;

          if (is_3d) cimg_for3XYZ(U,x,y,z) { // 3D version.
              const float
                X = is_backward?x - U(x,y,z,0):x + U(x,y,z,0),
                Y = is_backward?y - U(x,y,z,1):y + U(x,y,z,1),
                Z = is_backward?z - U(x,y,z,2):z + U(x,y,z,2);
              float deltaI = 0, _energy_regul = 0;
              if (is_backward) cimg_forC(I2,c) deltaI+=(float)(I1.linear_atXYZ(X,Y,Z,c) - I2(x,y,z,c));
              else cimg_forC(I2,c) deltaI+=(float)(I1(x,y,z,c) - I2.linear_atXYZ(X,Y,Z,c));
              cimg_forC(U,c) {
                const float
                  Ux = 0.5f*(U(_n1x,y,z,c) - U(_p1x,y,z,c)),
                  Uy = 0.5f*(U(x,_n1y,z,c) - U(x,_p1y,z,c)),
                  Uz = 0.5f*(U(x,y,_n1z,c) - U(x,y,_p1z,c)),
                  Uxx = U(_n1x,y,z,c) + U(_p1x,y,z,c),
                  Uyy = U(x,_n1y,z,c) + U(x,_p1y,z,c),
                  Uzz = U(x,y,_n1z,c) + U(x,y,_p1z,c);
                U(x,y,z,c) = (float)(U(x,y,z,c) + dt*(deltaI*dI[c].linear_atXYZ(X,Y,Z) + smoothness* ( Uxx + Uyy + Uzz)))/(1+6*smoothness*dt);
                _energy_regul+=Ux*Ux + Uy*Uy + Uz*Uz;
              }
              _energy+=deltaI*deltaI + smoothness*_energy_regul;
            }
          else cimg_for3XY(U,x,y) { // 2D version.
              const float
                X = is_backward?x - U(x,y,0):x + U(x,y,0),
                Y = is_backward?y - U(x,y,1):y + U(x,y,1);
              float deltaI = 0, _energy_regul = 0;
              if (is_backward) cimg_forC(I2,c) deltaI+=(float)(I1.linear_atXY(X,Y,c) - I2(x,y,c));
              else cimg_forC(I2,c) deltaI+=(float)(I1(x,y,c) - I2.linear_atXY(X,Y,c));
              cimg_forC(U,c) {
                const float
                  Ux = 0.5f*(U(_n1x,y,c) - U(_p1x,y,c)),
                  Uy = 0.5f*(U(x,_n1y,c) - U(x,_p1y,c)),
                  Uxx = U(_n1x,y,c) + U(_p1x,y,c),
                  Uyy = U(x,_n1y,c) + U(x,_p1y,c);
                U(x,y,c) = (float)(U(x,y,c) + dt*(deltaI*dI[c].linear_atXY(X,Y) + smoothness* ( Uxx + Uyy )))/(1+4*smoothness*dt);
                _energy_regul+=Ux*Ux + Uy*Uy;
              }
              _energy+=deltaI*deltaI + smoothness*_energy_regul;
            }
          const float d_energy = (_energy - energy)/(sw*sh*sd);
          if (d_energy<=0 && -d_energy<_precision) break;
          if (d_energy>0) dt*=0.5f;
          energy = _energy;
        }
      }
      return U;
    }

    //! Compute the distance transform according to a specified value.
    /** The distance transform implementation has been submitted by A. Meijster, and implements
        the article 'W.H. Hesselink, A. Meijster, J.B.T.M. Roerdink,
                     "A general algorithm for computing distance transforms in linear time.",
                     In: Mathematical Morphology and its Applications to Image and Signal Processing,
                     J. Goutsias, L. Vincent, and D.S. Bloomberg (eds.), Kluwer, 2000, pp. 331-340.'
         The submitted code has then been modified to fit CImg coding style and constraints.
    **/
    CImg<T>& distance(const T value, const unsigned int metric=2) {
      if (is_empty()) return *this;
      bool is_value = false;
      cimg_for(*this,ptr,T) *ptr = (T)(*ptr==value?is_value=true,0:999999999);
      if (!is_value) return fill(cimg::type<T>::max());
      switch (metric) {
      case 0 : return _distance_core(_distance_sep_cdt,_distance_dist_cdt);          // Chebyshev.
      case 1 : return _distance_core(_distance_sep_mdt,_distance_dist_mdt);          // Manhattan.
      case 3 : return _distance_core(_distance_sep_edt,_distance_dist_edt);          // Euclidean.
      default : return _distance_core(_distance_sep_edt,_distance_dist_edt).sqrt();  // Squared Euclidean.
      }
      return *this;
    }

    CImg<Tfloat> get_distance(const T value, const unsigned int metric=2) const {
      return CImg<Tfloat>(*this,false).distance((Tfloat)value,metric);
    }

    static long _distance_sep_edt(const long i, const long u, const long *const g) {
      return (u*u-i*i+g[u]-g[i])/(2*(u-i));
    }

    static long _distance_dist_edt(const long x, const long i, const long *const g) {
      return (x-i)*(x-i) + g[i];
    }

    static long _distance_sep_mdt(const long i, const long u, const long *const g) {
      return (u-i<=g[u]-g[i]?999999999:(g[u]-g[i]+u+i)/2);
    }

    static long _distance_dist_mdt(const long x, const long i, const long *const g) {
      return (x<i?i-x:x-i) + g[i];
    }

    static long _distance_sep_cdt(const long i, const long u, const long *const g) {
      const long h = (i+u)/2;
      if (g[i]<=g[u]) { return h<i+g[u]?i+g[u]:h; }
      return h<u-g[i]?h:u-g[i];
    }

    static long _distance_dist_cdt(const long x, const long i, const long *const g) {
      const long d = x<i?i-x:x-i;
      return d<g[i]?g[i]:d;
    }

    static void _distance_scan(const unsigned int len,
                               const long *const g,
                               long (*const sep)(const long, const long, const long *const),
                               long (*const f)(const long, const long, const long *const),
                               long *const s,
                               long *const t,
                               long *const dt) {
      long q = s[0] = t[0] = 0;
      for (int u = 1; u<(int)len; ++u) { // Forward scan.
        while ((q>=0) && f(t[q],s[q],g)>f(t[q],u,g)) { --q; }
        if (q<0) { q = 0; s[0] = u; }
        else { const long w = 1 + sep(s[q], u, g); if (w<(long)len) { ++q; s[q] = u; t[q] = w; }}
      }
      for (int u = (int)len-1; u>=0; --u) { dt[u] = f(u,s[q],g); if (u==t[q]) --q; } // Backward scan.
    }

    CImg<T>& _distance_core(long (*const sep)(const long, const long, const long *const),
                            long (*const f)(const long, const long, const long *const)) {
      const unsigned int wh = _width*_height;
      cimg_forC(*this,c) {
        CImg<longT> g(_width), dt(_width), s(_width), t(_width);
        CImg<T> img = get_shared_channel(c);
        cimg_forYZ(*this,y,z) { // Over X-direction.
          cimg_forX(*this,x) g[x] = (long)img(x,y,z,0,wh);
          _distance_scan(_width,g,sep,f,s,t,dt);
          cimg_forX(*this,x) img(x,y,z,0,wh) = (T)dt[x];
        }
        g.assign(_height); dt.assign(_height); s.assign(_height); t.assign(_height);
        cimg_forXZ(*this,x,z) { // Over Y-direction.
          cimg_forY(*this,y) g[y] = (long)img(x,y,z,0,wh);
          _distance_scan(_height,g,sep,f,s,t,dt);
          cimg_forY(*this,y) img(x,y,z,0,wh) = (T)dt[y];
        }
        if (_depth>1) {
          g.assign(_depth); dt.assign(_depth); s.assign(_depth); t.assign(_depth);
          cimg_forXY(*this,x,y) { // Over Z-direction.
            cimg_forZ(*this,z) g[z] = (long)img(x,y,z,0,wh);
            _distance_scan(_depth,g,sep,f,s,t,dt);
            cimg_forZ(*this,z) img(x,y,z,0,wh) = (T)dt[z];
          }
        }
      }
      return *this;
    }

    //! Compute the chamfer distance transform according to a specified value, with a custom metric.
    /**
       The algorithm code has been initially proposed by A. Meijster, and modified by D. Tschumperlé.
     **/
    template<typename t>
    CImg<T>& distance(const T value, const CImg<t>& metric_mask) {
      if (is_empty()) return *this;
      bool is_value = false;
      cimg_for(*this,ptr,T) *ptr = (T)(*ptr==value?is_value=true,0:999999999);
      if (!is_value) return fill(cimg::type<T>::max());
      const unsigned long wh = _width*_height;
      cimg_forC(*this,c) {
        CImg<T> img = get_shared_channel(c);
        cimg_forXYZ(metric_mask,dx,dy,dz) {
          const t weight = metric_mask(dx,dy,dz);
          if (weight) {
            for (int z = dz, nz = 0; z<depth(); ++z,++nz) { // Forward scan.
              for (int y = dy , ny = 0; y<height(); ++y,++ny) {
                for (int x = dx, nx = 0; x<width(); ++x,++nx) {
                  const T dd = img(nx,ny,nz,0,wh) + weight;
                  if (dd<img(x,y,z,0,wh)) img(x,y,z,0,wh) = dd;
                }
              }
            }
            for (int z = depth() - 1 - dz, nz = depth() - 1; z>=0; --z,--nz) { // Backward scan.
              for (int y = height() - 1 - dy, ny = height() - 1; y>=0; --y,--ny) {
                for (int x = width() - 1 - dx, nx = width() - 1; x>=0; --x,--nx) {
                  const T dd = img(nx,ny,nz,0,wh) + weight;
                  if (dd<img(x,y,z,0,wh)) img(x,y,z,0,wh) = dd;
                }
              }
            }
          }
        }
      }
      return *this;
    }

    template<typename t>
    CImg<Tfloat> get_distance(const T value, const CImg<t>& metric_mask) const {
      return CImg<Tfloat>(*this,false).distance(value,metric_mask);
    }

    //! Compute distance function from 0-valued isophotes by the application of an Eikonal PDE.
    CImg<T>& distance_eikonal(const unsigned int nb_iterations, const float band_size=0, const float time_step=0.5f) {
      if (is_empty()) return *this;
      CImg<Tfloat> velocity(*this);
      for (unsigned int iteration = 0; iteration<nb_iterations; ++iteration) {
        Tfloat *ptrd = velocity._data, veloc_max = 0;
        if (_depth>1) { // 3d
          CImg_3x3x3(I,Tfloat);
          cimg_forC(*this,c) cimg_for3x3x3(*this,x,y,z,c,I,Tfloat) if (band_size<=0 || cimg::abs(Iccc)<band_size) {
            const Tfloat
              gx = (Incc - Ipcc)/2,
              gy = (Icnc - Icpc)/2,
              gz = (Iccn - Iccp)/2,
              sgn = -cimg::sign(Iccc),
              ix = gx*sgn>0?(Incc - Iccc):(Iccc - Ipcc),
              iy = gy*sgn>0?(Icnc - Iccc):(Iccc - Icpc),
              iz = gz*sgn>0?(Iccn - Iccc):(Iccc - Iccp),
              ng = (Tfloat)(1e-5f + std::sqrt(gx*gx + gy*gy + gz*gz)),
              ngx = gx/ng,
              ngy = gy/ng,
              ngz = gz/ng,
              veloc = sgn*(ngx*ix + ngy*iy + ngz*iz - 1);
            *(ptrd++) = veloc;
            if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
          } else *(ptrd++) = 0;
        } else { // 2d version
          CImg_3x3(I,Tfloat);
          cimg_forC(*this,c) cimg_for3x3(*this,x,y,0,c,I,Tfloat) if (band_size<=0 || cimg::abs(Icc)<band_size) {
            const Tfloat
              gx = (Inc - Ipc)/2,
              gy = (Icn - Icp)/2,
              sgn = -cimg::sign(Icc),
              ix = gx*sgn>0?(Inc - Icc):(Icc - Ipc),
              iy = gy*sgn>0?(Icn - Icc):(Icc - Icp),
              ng = (Tfloat)(1e-5f + std::sqrt(gx*gx + gy*gy)),
              ngx = gx/ng,
              ngy = gy/ng,
              veloc = sgn*(ngx*ix + ngy*iy - 1);
            *(ptrd++) = veloc;
            if (veloc>veloc_max) veloc_max = veloc; else if (-veloc>veloc_max) veloc_max = -veloc;
          } else *(ptrd++) = 0;
        }
        if (veloc_max>0) *this+=(velocity*=time_step/veloc_max);
      }
      return *this;
    }

    CImg<Tfloat> get_distance_eikonal(const unsigned int nb_iterations, const float band_size=0, const float time_step=0.5f) const {
      return CImg<Tfloat>(*this,false).distance_eikonal(nb_iterations,band_size,time_step);
    }

    //! Compute the Haar multiscale wavelet transform (monodimensional version).
    /**
       \param axis Axis considered for the transform.
       \param invert Set inverse of direct transform.
       \param nb_scales Number of scales used for the transform.
    **/
    CImg<T>& haar(const char axis, const bool invert=false, const unsigned int nb_scales=1) {
      return get_haar(axis,invert,nb_scales).move_to(*this);
    }

    CImg<Tfloat> get_haar(const char axis, const bool invert=false, const unsigned int nb_scales=1) const {
      if (is_empty() || !nb_scales) return *this;
      CImg<Tfloat> res;

      if (nb_scales==1) {
        switch (cimg::uncase(axis)) { // Single scale transform
        case 'x' : {
          const unsigned int w = _width/2;
          if (w) {
            if (w%2)
              throw CImgInstanceException(_cimg_instance
                                          "haar() : Sub-image width %u is not even at scale %u.",
                                          cimg_instance,
                                          w);

            res.assign(_width,_height,_depth,_spectrum);
            if (invert) cimg_forYZC(*this,y,z,c) { // Inverse transform along X
              for (unsigned int x = 0, xw = w, x2 = 0; x<w; ++x, ++xw) {
                const Tfloat val0 = (Tfloat)(*this)(x,y,z,c), val1 = (Tfloat)(*this)(xw,y,z,c);
                res(x2++,y,z,c) = val0 - val1;
                res(x2++,y,z,c) = val0 + val1;
              }
            } else cimg_forYZC(*this,y,z,c) { // Direct transform along X
              for (unsigned int x = 0, xw = w, x2 = 0; x<w; ++x, ++xw) {
                const Tfloat val0 = (Tfloat)(*this)(x2++,y,z,c), val1 = (Tfloat)(*this)(x2++,y,z,c);
                res(x,y,z,c) = (val0 + val1)/2;
                res(xw,y,z,c) = (val1 - val0)/2;
              }
            }
          } else return *this;
        } break;
        case 'y' : {
          const unsigned int h = _height/2;
          if (h) {
            if (h%2)
              throw CImgInstanceException(_cimg_instance
                                          "haar() : Sub-image height %u is not even at scale %u.",
                                          cimg_instance,
                                          h);

            res.assign(_width,_height,_depth,_spectrum);
            if (invert) cimg_forXZC(*this,x,z,c) { // Inverse transform along Y
              for (unsigned int y = 0, yh = h, y2 = 0; y<h; ++y, ++yh) {
                const Tfloat val0 = (Tfloat)(*this)(x,y,z,c), val1 = (Tfloat)(*this)(x,yh,z,c);
                res(x,y2++,z,c) = val0 - val1;
                res(x,y2++,z,c) = val0 + val1;
              }
            } else cimg_forXZC(*this,x,z,c) {
              for (unsigned int y = 0, yh = h, y2 = 0; y<h; ++y, ++yh) { // Direct transform along Y
                const Tfloat val0 = (Tfloat)(*this)(x,y2++,z,c), val1 = (Tfloat)(*this)(x,y2++,z,c);
                res(x,y,z,c) = (val0 + val1)/2;
                res(x,yh,z,c) = (val1 - val0)/2;
              }
            }
          } else return *this;
        } break;
        case 'z' : {
          const unsigned int d = _depth/2;
          if (d) {
            if (d%2)
              throw CImgInstanceException(_cimg_instance
                                          "haar() : Sub-image depth %u is not even at scale %u.",
                                          cimg_instance,
                                          d);

            res.assign(_width,_height,_depth,_spectrum);
            if (invert) cimg_forXYC(*this,x,y,c) { // Inverse transform along Z
              for (unsigned int z = 0, zd = d, z2 = 0; z<d; ++z, ++zd) {
                const Tfloat val0 = (Tfloat)(*this)(x,y,z,c), val1 = (Tfloat)(*this)(x,y,zd,c);
                res(x,y,z2++,c) = val0 - val1;
                res(x,y,z2++,c) = val0 + val1;
              }
            } else cimg_forXYC(*this,x,y,c) {
              for (unsigned int z = 0, zd = d, z2 = 0; z<d; ++z, ++zd) { // Direct transform along Z
                const Tfloat val0 = (Tfloat)(*this)(x,y,z2++,c), val1 = (Tfloat)(*this)(x,y,z2++,c);
                res(x,y,z,c) = (val0 + val1)/2;
                res(x,y,zd,c) = (val1 - val0)/2;
              }
            }
          } else return *this;
        } break;
        default :
          throw CImgArgumentException(_cimg_instance
                                      "haar() : Invalid specified axis '%c' "
                                      "(should be { x | y | z }).",
                                      cimg_instance,
                                      axis);
        }
      } else { // Multi-scale version
        if (invert) {
          res.assign(*this);
          switch (cimg::uncase(axis)) {
          case 'x' : {
            unsigned int w = _width;
            for (unsigned int s = 1; w && s<nb_scales; ++s) w/=2;
            for (w = w?w:1; w<=_width; w*=2) res.draw_image(res.get_crop(0,w-1).get_haar('x',true,1));
          } break;
          case 'y' : {
            unsigned int h = _width;
            for (unsigned int s = 1; h && s<nb_scales; ++s) h/=2;
            for (h = h?h:1; h<=_height; h*=2) res.draw_image(res.get_crop(0,0,_width-1,h-1).get_haar('y',true,1));
          } break;
          case 'z' : {
            unsigned int d = _depth;
            for (unsigned int s = 1; d && s<nb_scales; ++s) d/=2;
            for (d = d?d:1; d<=_depth; d*=2) res.draw_image(res.get_crop(0,0,0,_width-1,_height-1,d-1).get_haar('z',true,1));
          } break;
          default :
            throw CImgArgumentException(_cimg_instance
                                        "haar() : Invalid specified axis '%c' "
                                        "(should be { x | y | z }).",
                                        cimg_instance,
                                        axis);
          }
        } else { // Direct transform
          res = get_haar(axis,false,1);
          switch (cimg::uncase(axis)) {
          case 'x' : {
            for (unsigned int s = 1, w = _width/2; w && s<nb_scales; ++s, w/=2) res.draw_image(res.get_crop(0,w-1).get_haar('x',false,1));
          } break;
          case 'y' : {
            for (unsigned int s = 1, h = _height/2; h && s<nb_scales; ++s, h/=2) res.draw_image(res.get_crop(0,0,_width-1,h-1).get_haar('y',false,1));
          } break;
          case 'z' : {
            for (unsigned int s = 1, d = _depth/2; d && s<nb_scales; ++s, d/=2) res.draw_image(res.get_crop(0,0,0,_width-1,_height-1,d-1).get_haar('z',false,1));
          } break;
          default :
            throw CImgArgumentException(_cimg_instance
                                        "haar() : Invalid specified axis '%c' "
                                        "(should be { x | y | z }).",
                                        cimg_instance,
                                        axis);
          }
        }
      }
      return res;
    }

    //! Compute the Haar multiscale wavelet transform.
    /**
       \param invert Set inverse of direct transform.
       \param nb_scales Number of scales used for the transform.
    **/
    CImg<T>& haar(const bool invert=false, const unsigned int nb_scales=1) {
      return get_haar(invert,nb_scales).move_to(*this);
    }

    CImg<Tfloat> get_haar(const bool invert=false, const unsigned int nb_scales=1) const {
      CImg<Tfloat> res;

      if (nb_scales==1) { // Single scale transform
        if (_width>1) get_haar('x',invert,1).move_to(res);
        if (_height>1) { if (res) res.haar('y',invert,1); else get_haar('y',invert,1).move_to(res); }
        if (_depth>1) { if (res) res.haar('z',invert,1); else get_haar('z',invert,1).move_to(res); }
        if (res) return res;
      } else { // Multi-scale transform
        if (invert) { // Inverse transform
          res.assign(*this);
          if (_width>1) {
            if (_height>1) {
              if (_depth>1) {
                unsigned int w = _width, h = _height, d = _depth; for (unsigned int s = 1; w && h && d && s<nb_scales; ++s) { w/=2; h/=2; d/=2; }
                for (w = w?w:1, h = h?h:1, d = d?d:1; w<=_width && h<=_height && d<=_depth; w*=2, h*=2, d*=2)
                  res.draw_image(res.get_crop(0,0,0,w-1,h-1,d-1).get_haar(true,1));
              } else {
                unsigned int w = _width, h = _height; for (unsigned int s = 1; w && h && s<nb_scales; ++s) { w/=2; h/=2; }
                for (w = w?w:1, h = h?h:1; w<=_width && h<=_height; w*=2, h*=2)
                  res.draw_image(res.get_crop(0,0,0,w-1,h-1,0).get_haar(true,1));
              }
            } else {
              if (_depth>1) {
                unsigned int w = _width, d = _depth; for (unsigned int s = 1; w && d && s<nb_scales; ++s) { w/=2; d/=2; }
                for (w = w?w:1, d = d?d:1; w<=_width && d<=_depth; w*=2, d*=2)
                  res.draw_image(res.get_crop(0,0,0,w-1,0,d-1).get_haar(true,1));
              } else {
                unsigned int w = _width; for (unsigned int s = 1; w && s<nb_scales; ++s) w/=2;
                for (w = w?w:1; w<=_width; w*=2)
                  res.draw_image(res.get_crop(0,0,0,w-1,0,0).get_haar(true,1));
              }
            }
          } else {
            if (_height>1) {
              if (_depth>1) {
                unsigned int h = _height, d = _depth; for (unsigned int s = 1; h && d && s<nb_scales; ++s) { h/=2; d/=2; }
                for (h = h?h:1, d = d?d:1; h<=_height && d<=_depth; h*=2, d*=2)
                  res.draw_image(res.get_crop(0,0,0,0,h-1,d-1).get_haar(true,1));
              } else {
                unsigned int h = _height; for (unsigned int s = 1; h && s<nb_scales; ++s) h/=2;
                for (h = h?h:1; h<=_height; h*=2)
                  res.draw_image(res.get_crop(0,0,0,0,h-1,0).get_haar(true,1));
              }
            } else {
              if (_depth>1) {
                unsigned int d = _depth; for (unsigned int s = 1; d && s<nb_scales; ++s) d/=2;
                for (d = d?d:1; d<=_depth; d*=2)
                  res.draw_image(res.get_crop(0,0,0,0,0,d-1).get_haar(true,1));
              } else return *this;
            }
          }
        } else { // Direct transform
          res = get_haar(false,1);
          if (_width>1) {
            if (_height>1) {
              if (_depth>1) for (unsigned int s = 1, w = _width/2, h = _height/2, d = _depth/2; w && h && d && s<nb_scales; ++s, w/=2, h/=2, d/=2)
                res.draw_image(res.get_crop(0,0,0,w-1,h-1,d-1).haar(false,1));
              else for (unsigned int s = 1, w = _width/2, h = _height/2; w && h && s<nb_scales; ++s, w/=2, h/=2)
                res.draw_image(res.get_crop(0,0,0,w-1,h-1,0).haar(false,1));
            } else {
              if (_depth>1) for (unsigned int s = 1, w = _width/2, d = _depth/2; w && d && s<nb_scales; ++s, w/=2, d/=2)
                res.draw_image(res.get_crop(0,0,0,w-1,0,d-1).haar(false,1));
              else for (unsigned int s = 1, w = _width/2; w && s<nb_scales; ++s, w/=2)
                res.draw_image(res.get_crop(0,0,0,w-1,0,0).haar(false,1));
            }
          } else {
            if (_height>1) {
              if (_depth>1) for (unsigned int s = 1, h = _height/2, d = _depth/2; h && d && s<nb_scales; ++s, h/=2, d/=2)
                res.draw_image(res.get_crop(0,0,0,0,h-1,d-1).haar(false,1));
              else for (unsigned int s = 1, h = _height/2; h && s<nb_scales; ++s, h/=2)
                res.draw_image(res.get_crop(0,0,0,0,h-1,0).haar(false,1));
            } else {
              if (_depth>1) for (unsigned int s = 1, d = _depth/2; d && s<nb_scales; ++s, d/=2)
                res.draw_image(res.get_crop(0,0,0,0,0,d-1).haar(false,1));
              else return *this;
            }
          }
        }
        return res;
      }
      return *this;
    }

    //! Compute a 1d Fast Fourier Transform, along a specified axis.
    CImgList<Tfloat> get_FFT(const char axis, const bool invert=false) const {
      CImgList<Tfloat> res(*this,CImg<Tfloat>());
      CImg<Tfloat>::FFT(res[0],res[1],axis,invert);
      return res;
    }

    //! Compute a n-d Fast-Fourier Transform.
    CImgList<Tfloat> get_FFT(const bool invert=false) const {
      CImgList<Tfloat> res(*this,CImg<Tfloat>());
      CImg<Tfloat>::FFT(res[0],res[1],invert);
      return res;
    }

    //! Compute a 1d Fast Fourier Transform, along a specified axis.
    static void FFT(CImg<T>& real, CImg<T>& imag, const char axis, const bool invert=false) {
      if (!real)
        throw CImgInstanceException("CImg<%s>::FFT() : Specified real part is empty.",
                                    pixel_type());

      if (!imag) imag.assign(real._width,real._height,real._depth,real._spectrum,0);
      if (!real.is_sameXYZC(imag))
        throw CImgInstanceException("CImg<%s>::FFT() : Specified real part (%u,%u,%u,%u,%p) and imaginary part (%u,%u,%u,%u,%p) have different dimensions.",
                                    pixel_type(),
                                    real._width,real._height,real._depth,real._spectrum,real._data,
                                    imag._width,imag._height,imag._depth,imag._spectrum,imag._data);
#ifdef cimg_use_fftw3
      fftw_complex *data_in;
      fftw_plan data_plan;

      switch (cimg::uncase(axis)) {
      case 'x' : { // Fourier along X, using FFTW library.
        data_in = (fftw_complex*)fftw_malloc(sizeof(fftw_complex)*real._width);
        data_plan = fftw_plan_dft_1d(real._width,data_in,data_in,invert?FFTW_BACKWARD:FFTW_FORWARD,FFTW_ESTIMATE);
        cimg_forYZC(real,y,z,c) {
          T *ptrr = real.data(0,y,z,c), *ptri = imag.data(0,y,z,c);
          double *ptrd = (double*)data_in;
          cimg_forX(real,x) { *(ptrd++) = (double)*(ptrr++); *(ptrd++) = (double)*(ptri++); }
          fftw_execute(data_plan);
          const unsigned int fact = real._width;
          if (invert) cimg_forX(real,x) { *(--ptri) = (T)(*(--ptrd)/fact); *(--ptrr) = (T)(*(--ptrd)/fact); }
          else cimg_forX(real,x) { *(--ptri) = (T)*(--ptrd); *(--ptrr) = (T)*(--ptrd); }
        }
      } break;
      case 'y' : { // Fourier along Y, using FFTW library.
        data_in = (fftw_complex*)fftw_malloc(sizeof(fftw_complex) * real._height);
        data_plan = fftw_plan_dft_1d(real._height,data_in,data_in,invert?FFTW_BACKWARD:FFTW_FORWARD,FFTW_ESTIMATE);
        const unsigned int off = real._width;
        cimg_forXZC(real,x,z,c) {
          T *ptrr = real.data(x,0,z,c), *ptri = imag.data(x,0,z,c);
          double *ptrd = (double*)data_in;
          cimg_forY(real,y) { *(ptrd++) = (double)*ptrr; *(ptrd++) = (double)*ptri; ptrr+=off; ptri+=off; }
          fftw_execute(data_plan);
          const unsigned int fact = real._height;
          if (invert) cimg_forY(real,y) { ptrr-=off; ptri-=off; *ptri = (T)(*(--ptrd)/fact); *ptrr = (T)(*(--ptrd)/fact); }
          else cimg_forY(real,y) { ptrr-=off; ptri-=off; *ptri = (T)*(--ptrd); *ptrr = (T)*(--ptrd); }
        }
      } break;
      case 'z' : { // Fourier along Z, using FFTW library.
        data_in = (fftw_complex*)fftw_malloc(sizeof(fftw_complex) * real._depth);
        data_plan = fftw_plan_dft_1d(real._depth,data_in,data_in,invert?FFTW_BACKWARD:FFTW_FORWARD,FFTW_ESTIMATE);
        const unsigned int off = real._width*real._height;
        cimg_forXYC(real,x,y,c) {
          T *ptrr = real.data(x,y,0,c), *ptri = imag.data(x,y,0,c);
          double *ptrd = (double*)data_in;
          cimg_forZ(real,z) { *(ptrd++) = (double)*ptrr; *(ptrd++) = (double)*ptri; ptrr+=off; ptri+=off; }
          fftw_execute(data_plan);
          const unsigned int fact = real._depth;
          if (invert) cimg_forZ(real,z) { ptrr-=off; ptri-=off; *ptri = (T)(*(--ptrd)/fact); *ptrr = (T)(*(--ptrd)/fact); }
          else cimg_forZ(real,z) { ptrr-=off; ptri-=off; *ptri = (T)*(--ptrd); *ptrr = (T)*(--ptrd); }
        }
      } break;
      default : { // Fourier along C, using FFTW library.
        data_in = (fftw_complex*)fftw_malloc(sizeof(fftw_complex) * real._spectrum);
        data_plan = fftw_plan_dft_1d(real._spectrum,data_in,data_in,invert?FFTW_BACKWARD:FFTW_FORWARD,FFTW_ESTIMATE);
        const unsigned int off = real._width*real._height*real._depth;
        cimg_forXYZ(real,x,y,z) {
          T *ptrr = real.data(x,y,z,0), *ptri = imag.data(x,y,z,0);
          double *ptrd = (double*)data_in;
          cimg_forC(real,c) { *(ptrd++) = (double)*ptrr; *(ptrd++) = (double)*ptri; ptrr+=off; ptri+=off; }
          fftw_execute(data_plan);
          const unsigned int fact = real._spectrum;
          if (invert) cimg_forC(real,c) { ptrr-=off; ptri-=off; *ptri = (T)(*(--ptrd)/fact); *ptrr = (T)(*(--ptrd)/fact); }
          else cimg_forC(real,c) { ptrr-=off; ptri-=off; *ptri = (T)*(--ptrd); *ptrr = (T)*(--ptrd); }
        }
      }
      }
      fftw_destroy_plan(data_plan);
      fftw_free(data_in);
#else
      switch (cimg::uncase(axis)) {
      case 'x' : { // Fourier along X, using built-in functions.
        const unsigned int N = real._width, N2 = (N>>1);
        if (((N-1)&N) && N!=1)
          throw CImgInstanceException("CImgList<%s>::FFT() : Specified real and imaginary parts (%u,%u,%u,%u) have non 2^N dimension along the X-axis.",
                                      pixel_type(),
                                      real._width,real._height,real._depth,real._spectrum);

        for (unsigned int i = 0, j = 0; i<N2; ++i) {
          if (j>i) cimg_forYZC(real,y,z,c) {
            cimg::swap(real(i,y,z,c),real(j,y,z,c)); cimg::swap(imag(i,y,z,c),imag(j,y,z,c));
            if (j<N2) {
              const unsigned int ri = N-1-i, rj = N-1-j;
              cimg::swap(real(ri,y,z,c),real(rj,y,z,c)); cimg::swap(imag(ri,y,z,c),imag(rj,y,z,c));
            }
          }
          for (unsigned int m = N, n = N2; (j+=n)>=m; j-=m, m = n, n>>=1) {}
        }
        for (unsigned int delta = 2; delta<=N; delta<<=1) {
          const unsigned int delta2 = (delta>>1);
          for (unsigned int i = 0; i<N; i+=delta) {
            float wr = 1, wi = 0;
            const float angle = (float)((invert?+1:-1)*2*cimg::PI/delta),
                        ca = (float)std::cos(angle),
                        sa = (float)std::sin(angle);
            for (unsigned int k = 0; k<delta2; ++k) {
              const unsigned int j = i + k, nj = j + delta2;
              cimg_forYZC(real,y,z,c) {
                T &ir = real(j,y,z,c), &ii = imag(j,y,z,c), &nir = real(nj,y,z,c), &nii = imag(nj,y,z,c);
                const float tmpr = (float)(wr*nir - wi*nii), tmpi = (float)(wr*nii + wi*nir);
                nir = (T)(ir - tmpr);
                nii = (T)(ii - tmpi);
                ir+=(T)tmpr;
                ii+=(T)tmpi;
              }
              const float nwr = wr*ca-wi*sa;
              wi = wi*ca + wr*sa;
              wr = nwr;
            }
          }
        }
        if (invert) { real/=N; imag/=N; }
      } break;
      case 'y' : { // Fourier along Y, using built-in functions.
        const unsigned int N = real._height, N2 = (N>>1);
        if (((N-1)&N) && N!=1)
          throw CImgInstanceException("CImgList<%s>::FFT() : Specified real and imaginary parts (%u,%u,%u,%u) have non 2^N dimension along the Y-axis.",
                                      pixel_type(),
                                      real._width,real._height,real._depth,real._spectrum);

        for (unsigned int i = 0, j = 0; i<N2; ++i) {
          if (j>i) cimg_forXZC(real,x,z,c) {
            cimg::swap(real(x,i,z,c),real(x,j,z,c)); cimg::swap(imag(x,i,z,c),imag(x,j,z,c));
            if (j<N2) {
              const unsigned int ri = N - 1 - i, rj = N - 1 - j;
              cimg::swap(real(x,ri,z,c),real(x,rj,z,c)); cimg::swap(imag(x,ri,z,c),imag(x,rj,z,c));
            }
          }
          for (unsigned int m = N, n = N2; (j+=n)>=m; j-=m, m = n, n>>=1) {}
        }
        for (unsigned int delta = 2; delta<=N; delta<<=1) {
          const unsigned int delta2 = (delta>>1);
          for (unsigned int i = 0; i<N; i+=delta) {
            float wr = 1, wi = 0;
            const float angle = (float)((invert?+1:-1)*2*cimg::PI/delta),
                        ca = (float)std::cos(angle), sa = (float)std::sin(angle);
            for (unsigned int k = 0; k<delta2; ++k) {
              const unsigned int j = i + k, nj = j + delta2;
              cimg_forXZC(real,x,z,c) {
                T &ir = real(x,j,z,c), &ii = imag(x,j,z,c), &nir = real(x,nj,z,c), &nii = imag(x,nj,z,c);
                const float tmpr = (float)(wr*nir - wi*nii), tmpi = (float)(wr*nii + wi*nir);
                nir = (T)(ir - tmpr);
                nii = (T)(ii - tmpi);
                ir+=(T)tmpr;
                ii+=(T)tmpi;
              }
              const float nwr = wr*ca-wi*sa;
              wi = wi*ca + wr*sa;
              wr = nwr;
            }
          }
        }
        if (invert) { real/=N; imag/=N; }
      } break;
      case 'z' : { // Fourier along Z, using built-in functions.
        const unsigned int N = real._depth, N2 = (N>>1);
        if (((N-1)&N) && N!=1)
          throw CImgInstanceException("CImgList<%s>::FFT() : Specified real and imaginary parts (%u,%u,%u,%u) have non 2^N dimension along the Z-axis.",
                                      pixel_type(),
                                      real._width,real._height,real._depth,real._spectrum);

        for (unsigned int i = 0, j = 0; i<N2; ++i) {
          if (j>i) cimg_forXYC(real,x,y,c) {
            cimg::swap(real(x,y,i,c),real(x,y,j,c)); cimg::swap(imag(x,y,i,c),imag(x,y,j,c));
            if (j<N2) {
              const unsigned int ri = N - 1 - i, rj = N - 1 - j;
              cimg::swap(real(x,y,ri,c),real(x,y,rj,c)); cimg::swap(imag(x,y,ri,c),imag(x,y,rj,c));
            }
          }
          for (unsigned int m = N, n = N2; (j+=n)>=m; j-=m, m = n, n>>=1) {}
        }
        for (unsigned int delta = 2; delta<=N; delta<<=1) {
          const unsigned int delta2 = (delta>>1);
          for (unsigned int i = 0; i<N; i+=delta) {
            float wr = 1, wi = 0;
            const float angle = (float)((invert?+1:-1)*2*cimg::PI/delta),
                        ca = (float)std::cos(angle), sa = (float)std::sin(angle);
            for (unsigned int k = 0; k<delta2; ++k) {
              const unsigned int j = i + k, nj = j + delta2;
              cimg_forXYC(real,x,y,c) {
                T &ir = real(x,y,j,c), &ii = imag(x,y,j,c), &nir = real(x,y,nj,c), &nii = imag(x,y,nj,c);
                const float tmpr = (float)(wr*nir - wi*nii), tmpi = (float)(wr*nii + wi*nir);
                nir = (T)(ir - tmpr);
                nii = (T)(ii - tmpi);
                ir+=(T)tmpr;
                ii+=(T)tmpi;
              }
              const float nwr = wr*ca-wi*sa;
              wi = wi*ca + wr*sa;
              wr = nwr;
            }
          }
        }
        if (invert) { real/=N; imag/=N; }
      } break;
      default :
        throw CImgArgumentException("CImgList<%s>::FFT() : Invalid specified axis '%c' for real and imaginary parts (%u,%u,%u,%u) "
                                    "(should be { x | y | z }).",
                                    pixel_type(),axis,
                                    real._width,real._height,real._depth,real._spectrum);
      }
#endif
    }

    //! Compute a n-d Fast Fourier Transform.
    static void FFT(CImg<T>& real, CImg<T>& imag, const bool invert=false) {
      if (!real)
        throw CImgInstanceException("CImgList<%s>::FFT() : Empty specified real part.",
                                    pixel_type());

      if (!imag) imag.assign(real._width,real._height,real._depth,real._spectrum,0);
      if (!real.is_sameXYZC(imag))
        throw CImgInstanceException("CImgList<%s>::FFT() : Specified real part (%u,%u,%u,%u,%p) and imaginary part (%u,%u,%u,%u,%p) have different dimensions.",
                                    pixel_type(),
                                    real._width,real._height,real._depth,real._spectrum,real._data,
                                    imag._width,imag._height,imag._depth,imag._spectrum,imag._data);

#ifdef cimg_use_fftw3
      fftw_complex *data_in = (fftw_complex*)fftw_malloc(sizeof(fftw_complex)*real._width*real._height*real._depth);
      fftw_plan data_plan;
      const unsigned int w = real._width, wh = w*real._height, whd = wh*real._depth;
      data_plan = fftw_plan_dft_3d(real._width,real._height,real._depth,data_in,data_in,invert?FFTW_BACKWARD:FFTW_FORWARD,FFTW_ESTIMATE);
      cimg_forC(real,c) {
        T *ptrr = real.data(0,0,0,c), *ptri = imag.data(0,0,0,c);
        double *ptrd = (double*)data_in;
        for (unsigned int x = 0; x<real._width; ++x, ptrr-=wh-1, ptri-=wh-1)
          for (unsigned int y = 0; y<real._height; ++y, ptrr-=whd-w, ptri-=whd-w)
            for (unsigned int z = 0; z<real._depth; ++z, ptrr+=wh, ptri+=wh) {
              *(ptrd++) = (double)*ptrr; *(ptrd++) = (double)*ptri;
            }
        fftw_execute(data_plan);
        ptrd = (double*)data_in;
        ptrr = real.data(0,0,0,c);
        ptri = imag.data(0,0,0,c);
        if (!invert) for (unsigned int x = 0; x<real._width; ++x, ptrr-=wh-1, ptri-=wh-1)
          for (unsigned int y = 0; y<real._height; ++y, ptrr-=whd-w, ptri-=whd-w)
            for (unsigned int z = 0; z<real._depth; ++z, ptrr+=wh, ptri+=wh) {
              *ptrr = (T)*(ptrd++); *ptri = (T)*(ptrd++);
            }
        else for (unsigned int x = 0; x<real._width; ++x, ptrr-=wh-1, ptri-=wh-1)
          for (unsigned int y = 0; y<real._height; ++y, ptrr-=whd-w, ptri-=whd-w)
            for (unsigned int z = 0; z<real._depth; ++z, ptrr+=wh, ptri+=wh) {
              *ptrr = (T)(*(ptrd++)/whd); *ptri = (T)(*(ptrd++)/whd);
            }
      }
      fftw_destroy_plan(data_plan);
      fftw_free(data_in);
#else
      if (real._depth>1)  FFT(real,imag,'z',invert);
      if (real._height>1) FFT(real,imag,'y',invert);
      if (real._width>1)  FFT(real,imag,'x',invert);
#endif
    }

    //@}
    //-------------------------------------
    //
    //! \name 3d Objects Management
    //@{
    //-------------------------------------

    //! Shift a 3d object.
    CImg<T>& shift_object3d(const float tx, const float ty=0, const float tz=0) {
      if (_height!=3 || _depth>1 || _spectrum>1)
        throw CImgInstanceException(_cimg_instance
                                    "shift_object3d() : Instance is not a set of 3d vertices.",
                                    cimg_instance);

      get_shared_line(0)+=tx; get_shared_line(1)+=ty; get_shared_line(2)+=tz;
      return *this;
    }

    CImg<Tfloat> get_shift_object3d(const float tx, const float ty=0, const float tz=0) const {
      return CImg<Tfloat>(*this,false).shift_object3d(tx,ty,tz);
    }

    //! Shift a 3d object so that it becomes centered.
    CImg<T>& shift_object3d() {
      if (_height!=3 || _depth>1 || _spectrum>1)
        throw CImgInstanceException(_cimg_instance
                                    "shift_object3d() : Instance is not a set of 3d vertices.",
                                    cimg_instance);

      CImg<T> xcoords = get_shared_line(0), ycoords = get_shared_line(1), zcoords = get_shared_line(2);
      float xm, xM = (float)xcoords.max_min(xm), ym, yM = (float)ycoords.max_min(ym), zm, zM = (float)zcoords.max_min(zm);
      xcoords-=(xm + xM)/2; ycoords-=(ym + yM)/2; zcoords-=(zm + zM)/2;
      return *this;
    }

    CImg<Tfloat> get_shift_object3d() const {
      return CImg<Tfloat>(*this,false).shift_object3d();
    }

    //! Resize a 3d object.
    CImg<T>& resize_object3d(const float sx, const float sy=-100, const float sz=-100) {
      if (_height!=3 || _depth>1 || _spectrum>1)
        throw CImgInstanceException(_cimg_instance
                                    "resize_object3d() : Instance is not a set of 3d vertices.",
                                    cimg_instance);

      CImg<T> xcoords = get_shared_line(0), ycoords = get_shared_line(1), zcoords = get_shared_line(2);
      float xm, xM = (float)xcoords.max_min(xm), ym, yM = (float)ycoords.max_min(ym), zm, zM = (float)zcoords.max_min(zm);
      if (xm<xM) { if (sx>0) xcoords*=sx/(xM-xm); else xcoords*=-sx/100; }
      if (ym<yM) { if (sy>0) ycoords*=sy/(yM-ym); else ycoords*=-sy/100; }
      if (zm<zM) { if (sz>0) zcoords*=sz/(zM-zm); else zcoords*=-sz/100; }
      return *this;
    }

    CImg<Tfloat> get_resize_object3d(const float sx, const float sy=-100, const float sz=-100) const {
      return CImg<Tfloat>(*this,false).resize_object3d(sx,sy,sz);
    }

    //! Resize a 3d object so that its max dimension if one.
    CImg<T> resize_object3d() {
      if (_height!=3 || _depth>1 || _spectrum>1)
        throw CImgInstanceException(_cimg_instance
                                    "resize_object3d() : Instance is not a set of 3d vertices.",
                                    cimg_instance);

      CImg<T> xcoords = get_shared_line(0), ycoords = get_shared_line(1), zcoords = get_shared_line(2);
      float xm, xM = (float)xcoords.max_min(xm), ym, yM = (float)ycoords.max_min(ym), zm, zM = (float)zcoords.max_min(zm);
      const float dx = xM - xm, dy = yM - ym, dz = zM - zm, dmax = cimg::max(dx,dy,dz);
      if (dmax>0) { xcoords/=dmax; ycoords/=dmax; zcoords/=dmax; }
      return *this;
    }

    CImg<Tfloat> get_resize_object3d() const {
      return CImg<Tfloat>(*this,false).resize_object3d();
    }

    //! Append a 3d object to another one.
    template<typename tf, typename tp, typename tff>
    CImg<T>& append_object3d(CImgList<tf>& primitives, const CImg<tp>& obj_vertices, const CImgList<tff>& obj_primitives) {
      if (!obj_vertices || !obj_primitives) return *this;
      if (obj_vertices._height!=3 || obj_vertices._depth>1 || obj_vertices._spectrum>1)
        throw CImgInstanceException(_cimg_instance
                                    "append_object3d() : Specified vertice image (%u,%u,%u,%u,%p) is not a set of 3d vertices.",
                                    cimg_instance,
                                    obj_vertices._width,obj_vertices._height,obj_vertices._depth,obj_vertices._spectrum,obj_vertices._data);

      if (is_empty()) { primitives.assign(obj_primitives); return assign(obj_vertices); }
      if (_height!=3 || _depth>1 || _spectrum>1)
        throw CImgInstanceException(_cimg_instance
                                    "append_object3d() : Instance is not a set of 3d vertices.",
                                    cimg_instance);

      const unsigned int P = _width;
      append(obj_vertices,'x');
      const unsigned int N = primitives._width;
      primitives.insert(obj_primitives);
      for (unsigned int i = N; i<primitives._width; ++i) {
        CImg<tf> &p = primitives[i];
        switch (p.size()) {
        case 1 : p[0]+=P; break; // Point.
        case 5 : p[0]+=P; p[1]+=P; break; // Sphere.
        case 2 : case 6 : p[0]+=P; p[1]+=P; break; // Segment.
        case 3 : case 9 : p[0]+=P; p[1]+=P; p[2]+=P; break; // Triangle.
        case 4 : case 12 : p[0]+=P; p[1]+=P; p[2]+=P; p[3]+=P; break; // Rectangle.
        }
      }
      return *this;
    }

    //! Texturize primitives of a 3d object.
    template<typename tp, typename tc, typename tt, typename tx>
    const CImg<T>& texturize_object3d(CImgList<tp>& primitives, CImgList<tc>& colors,
                                      const CImg<tt>& texture, const CImg<tx>& coords=CImg<tx>::empty()) const {
      if (is_empty()) return *this;
      if (_height!=3)
        throw CImgInstanceException(_cimg_instance
                                    "texturize_object3d() : Instance image is not a set of 3d points.",
                                    cimg_instance);
      if (coords && (coords._width!=_width || coords._height!=2))
        throw CImgArgumentException(_cimg_instance
                                    "texturize_object3d() : Invalid specified texture coordinates (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    coords._width,coords._height,coords._depth,coords._spectrum,coords._data);
      CImg<unsigned int> _coords;
      if (!coords) { // If no texture coordinates specified, do a default XY-projection.
        _coords.assign(_width,2);
        float
          xmin, xmax = (float)get_shared_line(0).max_min(xmin),
          ymin, ymax = (float)get_shared_line(1).max_min(ymin),
          dx = xmax>xmin?xmax-xmin:1,
          dy = ymax>ymin?ymax-ymin:1;
        cimg_forX(*this,p) {
          _coords(p,0) = (unsigned int)(((*this)(p,0)-xmin)*(texture._width-1)/dx);
          _coords(p,1) = (unsigned int)(((*this)(p,1)-ymin)*(texture._height-1)/dy);
        }
      } else _coords = coords;

      int texture_ind = -1;
      cimglist_for(primitives,l) {
        CImg<tp> &p = primitives[l];
        const unsigned int siz = p.size();
        switch (siz) {
        case 1 : { // Point.
          const unsigned int
            i0 = (unsigned int)p[0],
            x0 = (unsigned int)_coords(i0,0), y0 = (unsigned int)_coords(i0,1);
          texture.get_vector_at(x0,y0).move_to(colors[l]);
        } break;
        case 2 : case 6 : { // Line.
          const unsigned int
            i0 = (unsigned int)p[0], i1 = (unsigned int)p[1],
            x0 = (unsigned int)_coords(i0,0), y0 = (unsigned int)_coords(i0,1),
            x1 = (unsigned int)_coords(i1,0), y1 = (unsigned int)_coords(i1,1);
          if (texture_ind<0) colors[texture_ind=l] = texture; else colors[l].assign(colors[texture_ind],true);
          CImg<tp>::vector(i0,i1,x0,y0,x1,y1).move_to(p);
        } break;
        case 3 : case 9 : { // Triangle.
          const unsigned int
            i0 = (unsigned int)p[0], i1 = (unsigned int)p[1], i2 = (unsigned int)p[2],
            x0 = (unsigned int)_coords(i0,0), y0 = (unsigned int)_coords(i0,1),
            x1 = (unsigned int)_coords(i1,0), y1 = (unsigned int)_coords(i1,1),
            x2 = (unsigned int)_coords(i2,0), y2 = (unsigned int)_coords(i2,1);
          if (texture_ind<0) colors[texture_ind=l] = texture; else colors[l].assign(colors[texture_ind],true);
          CImg<tp>::vector(i0,i1,i2,x0,y0,x1,y1,x2,y2).move_to(p);
        } break;
        case 4 : case 12 : { // Quadrangle.
          const unsigned int
            i0 = (unsigned int)p[0], i1 = (unsigned int)p[1], i2 = (unsigned int)p[2], i3 = (unsigned int)p[3],
            x0 = (unsigned int)_coords(i0,0), y0 = (unsigned int)_coords(i0,1),
            x1 = (unsigned int)_coords(i1,0), y1 = (unsigned int)_coords(i1,1),
            x2 = (unsigned int)_coords(i2,0), y2 = (unsigned int)_coords(i2,1),
            x3 = (unsigned int)_coords(i3,0), y3 = (unsigned int)_coords(i3,1);
          if (texture_ind<0) colors[texture_ind=l] = texture; else colors[l].assign(colors[texture_ind],true);
          CImg<tp>::vector(i0,i1,i2,i3,x0,y0,x1,y1,x2,y2,x3,y3).move_to(p);
        } break;
        }
      }
      return *this;
    }

    //! Create and return a 3d elevation of the instance image.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param[out] colors The returned list of the 3d object colors.
       \param elevation The input elevation map.
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg");
       CImgList<unsigned int> faces3d;
       CImgList<unsigned char> colors3d;
       const CImg<float> points3d = img.get_elevation3d(faces3d,colors,img.get_norm()*0.2);
       CImg<unsigned char>().display_object3d("Elevation3d",points3d,faces3d,colors3d);
       \endcode
       \image html ref_elevation3d.jpg
    **/
    template<typename tf, typename tc, typename te>
    CImg<floatT> get_elevation3d(CImgList<tf>& primitives, CImgList<tc>& colors, const CImg<te>& elevation) const {
      if (!is_sameXY(elevation) || elevation._depth>1 || elevation._spectrum>1)
        throw CImgArgumentException(_cimg_instance
                                    "get_elevation3d() : Instance and specified elevation (%u,%u,%u,%u,%p) "
                                    "have incompatible dimensions.",
                                    cimg_instance,
                                    elevation._width,elevation._height,elevation._depth,elevation._spectrum,elevation._data);
      if (is_empty()) return *this;
      float m, M = (float)max_min(m);
      if (M==m) ++M;
      colors.assign();
      const unsigned int size_x1 = _width - 1, size_y1 = _height - 1;
      for (unsigned int y = 0; y<size_y1; ++y)
        for (unsigned int x = 0; x<size_x1; ++x) {
          const unsigned char
            r = (unsigned char)(((*this)(x,y,0) - m)*255/(M-m)),
            g = _spectrum>1?(unsigned char)(((*this)(x,y,1) - m)*255/(M-m)):r,
            b = _spectrum>2?(unsigned char)(((*this)(x,y,2) - m)*255/(M-m)):(_spectrum>1?0:r);
          CImg<tc>::vector((tc)r,(tc)g,(tc)b).move_to(colors);
        }
      const typename CImg<te>::_functor2d_int func(elevation);
      return elevation3d(primitives,func,0,0,_width-1.0f,_height-1.0f,_width,_height);
    }

    //! Create and return the 3d projection planes of the instance image.
    template<typename tf, typename tc>
    CImg<floatT> get_projections3d(CImgList<tf>& primitives, CImgList<tc>& colors,
                                   const unsigned int x0, const unsigned int y0, const unsigned int z0,
                                   const bool normalize_colors=false) const {
      float m = 0, M = 0, delta = 1;
      if (normalize_colors) { m = (float)min_max(M); delta = 255/(m==M?1:M-m); }
      const unsigned int
        _x0 = (x0>=_width)?_width - 1:x0,
        _y0 = (y0>=_height)?_height - 1:y0,
        _z0 = (z0>=_depth)?_depth - 1:z0;
      CImg<tc> img_xy, img_xz, img_yz;
      if (normalize_colors) {
        ((get_crop(0,0,_z0,0,_width-1,_height-1,_z0,_spectrum-1)-=m)*=delta).move_to(img_xy);
        ((get_crop(0,_y0,0,0,_width-1,_y0,_depth-1,_spectrum-1)-=m)*=delta).resize(_width,_depth,1,-100,-1).move_to(img_xz);
        ((get_crop(_x0,0,0,0,_x0,_height-1,_depth-1,_spectrum-1)-=m)*=delta).resize(_height,_depth,1,-100,-1).move_to(img_yz);
      } else {
        get_crop(0,0,_z0,0,_width-1,_height-1,_z0,_spectrum-1).move_to(img_xy);
        get_crop(0,_y0,0,0,_width-1,_y0,_depth-1,_spectrum-1).resize(_width,_depth,1,-100,-1).move_to(img_xz);
        get_crop(_x0,0,0,0,_x0,_height-1,_depth-1,_spectrum-1).resize(_height,_depth,1,-100,-1).move_to(img_yz);
      }
      CImg<floatT> points(12,3,1,1,
                          0,_width-1,_width-1,0,   0,_width-1,_width-1,0, _x0,_x0,_x0,_x0,
                          0,0,_height-1,_height-1, _y0,_y0,_y0,_y0,       0,_height-1,_height-1,0,
                          _z0,_z0,_z0,_z0,         0,0,_depth-1,_depth-1, 0,0,_depth-1,_depth-1);
      primitives.assign();
      CImg<tf>::vector(0,1,2,3,0,0,img_xy._width-1,0,img_xy._width-1,img_xy._height-1,0,img_xy._height-1).move_to(primitives);
      CImg<tf>::vector(4,5,6,7,0,0,img_xz._width-1,0,img_xz._width-1,img_xz._height-1,0,img_xz._height-1).move_to(primitives);
      CImg<tf>::vector(8,9,10,11,0,0,img_yz._width-1,0,img_yz._width-1,img_yz._height-1,0,img_yz._height-1).move_to(primitives);
      colors.assign();
      img_xy.move_to(colors);
      img_xz.move_to(colors);
      img_yz.move_to(colors);
      return points;
    }

    //! Create and return a isoline of the instance image as a 3d object.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param isovalue The returned list of the 3d object colors.
       \param size_x The number of subdivisions along the X-axis.
       \param size_y The number of subdisivions along the Y-axis.
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       const CImg<float> img("reference.jpg");
       CImgList<unsigned int> faces3d;
       const CImg<float> points3d = img.get_isoline3d(faces3d,100);
       CImg<unsigned char>().display_object3d("Isoline3d",points3d,faces3d,colors3d);
       \endcode
       \image html ref_isoline3d.jpg
    **/
    template<typename tf>
    CImg<floatT> get_isoline3d(CImgList<tf>& primitives, const float isovalue,
                               const int size_x=-100, const int size_y=-100) const {
      if (_spectrum>1)
        throw CImgInstanceException(_cimg_instance
                                    "get_isoline3d() : Instance is not a scalar image.",
                                    cimg_instance);
      primitives.assign();
      if (is_empty()) return *this;
      CImg<floatT> vertices;
      if ((size_x==-100 && size_y==-100) || (size_x==width() && size_y==height())) {
        const _functor2d_int func(*this);
        vertices = isoline3d(primitives,func,isovalue,0,0,width()-1.0f,height()-1.0f,size_x,size_y);
      } else {
        const _functor2d_float func(*this);
        vertices = isoline3d(primitives,func,isovalue,0,0,width()-1.0f,height()-1.0f,size_x,size_y);
      }
      return vertices;
    }

    //! Create and return a isosurface of the instance image as a 3d object.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param isovalue The returned list of the 3d object colors.
       \param size_x The number of subdivisions along the X-axis.
       \param size_y The number of subdisivions along the Y-axis.
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       const CImg<float> img = CImg<unsigned char>("reference.jpg").resize(-100,-100,20);
       CImgList<unsigned int> faces3d;
       const CImg<float> points3d = img.get_isosurface3d(faces3d,100);
       CImg<unsigned char>().display_object3d("Isosurface3d",points3d,faces3d,colors3d);
       \endcode
       \image html ref_isosurface3d.jpg
    **/
    template<typename tf>
    CImg<floatT> get_isosurface3d(CImgList<tf>& primitives, const float isovalue,
                                  const int size_x=-100, const int size_y=-100, const int size_z=-100) const {
      if (_spectrum>1)
        throw CImgInstanceException(_cimg_instance
                                    "get_isosurface3d() : Instance is not a scalar image.",
                                    cimg_instance);
      primitives.assign();
      if (is_empty()) return *this;
      CImg<floatT> vertices;
      if ((size_x==-100 && size_y==-100 && size_z==-100) || (size_x==width() && size_y==height() && size_z==depth())) {
        const _functor3d_int func(*this);
        vertices = isosurface3d(primitives,func,isovalue,0,0,0,width()-1.0f,height()-1.0f,depth()-1.0f,size_x,size_y,size_z);
      } else {
        const _functor3d_float func(*this);
        vertices = isosurface3d(primitives,func,isovalue,0,0,0,width()-1.0f,height()-1.0f,depth()-1.0f,size_x,size_y,size_z);
      }
      return vertices;
    }

    //! Get elevation3d of a function.
    template<typename tf, typename tfunc>
    static CImg<floatT> elevation3d(CImgList<tf>& primitives, const tfunc& func,
                                    const float x0, const float y0, const float x1, const float y1,
                                    const int size_x=256, const int size_y=256) {
      const float
        nx0 = x0<x1?x0:x1, ny0 = y0<y1?y0:y1,
        nx1 = x0<x1?x1:x0, ny1 = y0<y1?y1:y0;
      const unsigned int
        _nsize_x = (unsigned int)(size_x>=0?size_x:(nx1-nx0)*-size_x/100), nsize_x = _nsize_x?_nsize_x:1, nsize_x1 = nsize_x - 1,
        _nsize_y = (unsigned int)(size_y>=0?size_y:(ny1-ny0)*-size_y/100), nsize_y = _nsize_y?_nsize_y:1, nsize_y1 = nsize_y - 1;
      if (nsize_x<2 || nsize_y<2)
        throw CImgArgumentException("CImg<%s>::elevation3d() : Invalid specified size (%d,%d).",
                                    pixel_type(),
                                    nsize_x,nsize_y);

      CImg<floatT> vertices(nsize_x*nsize_y,3);
      floatT *ptr_x = vertices.data(0,0), *ptr_y = vertices.data(0,1), *ptr_z = vertices.data(0,2);
      for (unsigned int y = 0; y<nsize_y; ++y) {
        const float Y = ny0 + y*(ny1-ny0)/nsize_y1;
        for (unsigned int x = 0; x<nsize_x; ++x) {
          const float X = nx0 + x*(nx1-nx0)/nsize_x1;
          *(ptr_x++) = (float)x;
          *(ptr_y++) = (float)y;
          *(ptr_z++) = (float)func(X,Y);
        }
      }
      primitives.assign(nsize_x1*nsize_y1,1,4);
      for (unsigned int p = 0, y = 0; y<nsize_y1; ++y) {
        const unsigned int yw = y*nsize_x;
        for (unsigned int x = 0; x<nsize_x1; ++x) {
          const unsigned int xpyw = x + yw, xpyww = xpyw + nsize_x;
          primitives[p++].fill(xpyw,xpyww,xpyww+1,xpyw+1);
        }
      }
      return vertices;
    }

    template<typename tf>
    static CImg<floatT> elevation3d(CImgList<tf>& primitives, const char *const expression,
                                    const float x0, const float y0, const float x1, const float y1,
                                    const int sizex=256, const int sizey=256) {
      const _functor2d_expr func(expression);
      return elevation3d(primitives,func,x0,y0,x1,y1,sizex,sizey);
    }

    //! Get isoline as a 3d object.
    template<typename tf, typename tfunc>
    static CImg<floatT> isoline3d(CImgList<tf>& primitives, const tfunc& func, const float isovalue,
                                  const float x0, const float y0, const float x1, const float y1,
                                  const int sizex=256, const int sizey=256) {
      static const unsigned int edges[16] = { 0x0, 0x9, 0x3, 0xa, 0x6, 0xf, 0x5, 0xc, 0xc, 0x5, 0xf, 0x6, 0xa, 0x3, 0x9, 0x0 };
      static const int segments[16][4] = { { -1,-1,-1,-1 }, { 0,3,-1,-1 }, { 0,1,-1,-1 }, { 1,3,-1,-1 },
                                           { 1,2,-1,-1 },   { 0,1,2,3 },   { 0,2,-1,-1 }, { 2,3,-1,-1 },
                                           { 2,3,-1,-1 },   { 0,2,-1,-1},  { 0,3,1,2 },   { 1,2,-1,-1 },
                                           { 1,3,-1,-1 },   { 0,1,-1,-1},  { 0,3,-1,-1},  { -1,-1,-1,-1 } };
      const unsigned int
        _nx = (unsigned int)(sizex>=0?sizex:((x1-x0)*-sizex/100 + 1)),
        _ny = (unsigned int)(sizey>=0?sizey:((y1-y0)*-sizey/100 + 1)),
        nx = _nx?_nx:1,
        ny = _ny?_ny:1,
        nxm1 = nx - 1,
        nym1 = ny - 1;
      primitives.assign();
      if (!nxm1 || !nym1) return CImg<floatT>();
      const float dx = (x1 - x0)/nxm1, dy = (y1 - y0)/nym1;
      CImgList<floatT> vertices;
      CImg<intT> indices1(nx,1,1,2,-1), indices2(nx,1,1,2);
      CImg<floatT> values1(nx), values2(nx);
      float X = x0, Y = y0, nX = X + dx, nY = Y + dy;

      // Fill first line with values
      cimg_forX(values1,x) { values1(x) = (float)func(X,Y); X+=dx; }

      // Run the marching squares algorithm
      for (unsigned int yi = 0, nyi = 1; yi<nym1; ++yi, ++nyi, Y=nY, nY+=dy) {
        X = x0; nX = X + dx;
        indices2.fill(-1);
        for (unsigned int xi = 0, nxi = 1; xi<nxm1; ++xi, ++nxi, X=nX, nX+=dx) {

          // Determine square configuration
          const float
            val0 = values1(xi),
            val1 = values1(nxi),
            val2 = values2(nxi) = (float)func(nX,nY),
            val3 = values2(xi) = (float)func(X,nY);
          const unsigned int
            configuration = (val0<isovalue?1:0)  | (val1<isovalue?2:0)  | (val2<isovalue?4:0)  | (val3<isovalue?8:0),
            edge = edges[configuration];

          // Compute intersection vertices
          if (edge) {
            if ((edge&1) && indices1(xi,0)<0) {
              const float Xi = X + (isovalue-val0)*dx/(val1-val0);
              indices1(xi,0) = vertices._width;
              CImg<floatT>::vector(Xi,Y,0).move_to(vertices);
            }
            if ((edge&2) && indices1(nxi,1)<0) {
              const float Yi = Y + (isovalue-val1)*dy/(val2-val1);
              indices1(nxi,1) = vertices._width;
              CImg<floatT>::vector(nX,Yi,0).move_to(vertices);
            }
            if ((edge&4) && indices2(xi,0)<0) {
              const float Xi = X + (isovalue-val3)*dx/(val2-val3);
              indices2(xi,0) = vertices._width;
              CImg<floatT>::vector(Xi,nY,0).move_to(vertices);
            }
            if ((edge&8) && indices1(xi,1)<0) {
              const float Yi = Y + (isovalue-val0)*dy/(val3-val0);
              indices1(xi,1) = vertices._width;
              CImg<floatT>::vector(X,Yi,0).move_to(vertices);
            }

            // Create segments
            for (const int *segment = segments[configuration]; *segment!=-1; ) {
              const unsigned int p0 = *(segment++), p1 = *(segment++);
              const tf
                i0 = (tf)(_isoline3d_indice(p0,indices1,indices2,xi,nxi)),
                i1 = (tf)(_isoline3d_indice(p1,indices1,indices2,xi,nxi));
              CImg<tf>::vector(i0,i1).move_to(primitives);
            }
          }
        }
        values1.swap(values2);
        indices1.swap(indices2);
      }
      return vertices>'x';
    }

    template<typename tf>
    static CImg<floatT> isoline3d(CImgList<tf>& primitives, const char *const expression, const float isovalue,
                                  const float x0, const float y0, const float x1, const float y1,
                                  const int sizex=256, const int sizey=256) {
      const _functor2d_expr func(expression);
      return isoline3d(primitives,func,isovalue,x0,y0,x1,y1,sizex,sizey);
    }

    template<typename t>
    static int _isoline3d_indice(const unsigned int edge, const CImg<t>& indices1, const CImg<t>& indices2,
                                 const unsigned int x, const unsigned int nx) {
      switch (edge) {
      case 0 : return (int)indices1(x,0);
      case 1 : return (int)indices1(nx,1);
      case 2 : return (int)indices2(x,0);
      case 3 : return (int)indices1(x,1);
      }
      return 0;
    }

    //! Get isosurface as a 3d object.
    template<typename tf, typename tfunc>
    static CImg<floatT> isosurface3d(CImgList<tf>& primitives, const tfunc& func, const float isovalue,
                                     const float x0, const float y0, const float z0,
                                     const float x1, const float y1, const float z1,
                                     const int size_x=32, const int size_y=32, const int size_z=32) {
      static unsigned int edges[256] = {
        0x000, 0x109, 0x203, 0x30a, 0x406, 0x50f, 0x605, 0x70c, 0x80c, 0x905, 0xa0f, 0xb06, 0xc0a, 0xd03, 0xe09, 0xf00,
        0x190, 0x99 , 0x393, 0x29a, 0x596, 0x49f, 0x795, 0x69c, 0x99c, 0x895, 0xb9f, 0xa96, 0xd9a, 0xc93, 0xf99, 0xe90,
        0x230, 0x339, 0x33 , 0x13a, 0x636, 0x73f, 0x435, 0x53c, 0xa3c, 0xb35, 0x83f, 0x936, 0xe3a, 0xf33, 0xc39, 0xd30,
        0x3a0, 0x2a9, 0x1a3, 0xaa , 0x7a6, 0x6af, 0x5a5, 0x4ac, 0xbac, 0xaa5, 0x9af, 0x8a6, 0xfaa, 0xea3, 0xda9, 0xca0,
        0x460, 0x569, 0x663, 0x76a, 0x66 , 0x16f, 0x265, 0x36c, 0xc6c, 0xd65, 0xe6f, 0xf66, 0x86a, 0x963, 0xa69, 0xb60,
        0x5f0, 0x4f9, 0x7f3, 0x6fa, 0x1f6, 0xff , 0x3f5, 0x2fc, 0xdfc, 0xcf5, 0xfff, 0xef6, 0x9fa, 0x8f3, 0xbf9, 0xaf0,
        0x650, 0x759, 0x453, 0x55a, 0x256, 0x35f, 0x55 , 0x15c, 0xe5c, 0xf55, 0xc5f, 0xd56, 0xa5a, 0xb53, 0x859, 0x950,
        0x7c0, 0x6c9, 0x5c3, 0x4ca, 0x3c6, 0x2cf, 0x1c5, 0xcc , 0xfcc, 0xec5, 0xdcf, 0xcc6, 0xbca, 0xac3, 0x9c9, 0x8c0,
        0x8c0, 0x9c9, 0xac3, 0xbca, 0xcc6, 0xdcf, 0xec5, 0xfcc, 0xcc , 0x1c5, 0x2cf, 0x3c6, 0x4ca, 0x5c3, 0x6c9, 0x7c0,
        0x950, 0x859, 0xb53, 0xa5a, 0xd56, 0xc5f, 0xf55, 0xe5c, 0x15c, 0x55 , 0x35f, 0x256, 0x55a, 0x453, 0x759, 0x650,
        0xaf0, 0xbf9, 0x8f3, 0x9fa, 0xef6, 0xfff, 0xcf5, 0xdfc, 0x2fc, 0x3f5, 0xff , 0x1f6, 0x6fa, 0x7f3, 0x4f9, 0x5f0,
        0xb60, 0xa69, 0x963, 0x86a, 0xf66, 0xe6f, 0xd65, 0xc6c, 0x36c, 0x265, 0x16f, 0x66 , 0x76a, 0x663, 0x569, 0x460,
        0xca0, 0xda9, 0xea3, 0xfaa, 0x8a6, 0x9af, 0xaa5, 0xbac, 0x4ac, 0x5a5, 0x6af, 0x7a6, 0xaa , 0x1a3, 0x2a9, 0x3a0,
        0xd30, 0xc39, 0xf33, 0xe3a, 0x936, 0x83f, 0xb35, 0xa3c, 0x53c, 0x435, 0x73f, 0x636, 0x13a, 0x33 , 0x339, 0x230,
        0xe90, 0xf99, 0xc93, 0xd9a, 0xa96, 0xb9f, 0x895, 0x99c, 0x69c, 0x795, 0x49f, 0x596, 0x29a, 0x393, 0x99 , 0x190,
        0xf00, 0xe09, 0xd03, 0xc0a, 0xb06, 0xa0f, 0x905, 0x80c, 0x70c, 0x605, 0x50f, 0x406, 0x30a, 0x203, 0x109, 0x000 };

      static int triangles[256][16] = {
        { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 0, 1, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 1, 8, 3, 9, 8, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 8, 3, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 2, 10, 0, 2, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 2, 8, 3, 2, 10, 8, 10, 9, 8, -1, -1, -1, -1, -1, -1, -1 },
        { 3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 11, 2, 8, 11, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 9, 0, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 1, 11, 2, 1, 9, 11, 9, 8, 11, -1, -1, -1, -1, -1, -1, -1 },
        { 3, 10, 1, 11, 10, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 10, 1, 0, 8, 10, 8, 11, 10, -1, -1, -1, -1, -1, -1, -1 },
        { 3, 9, 0, 3, 11, 9, 11, 10, 9, -1, -1, -1, -1, -1, -1, -1 }, { 9, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 4, 3, 0, 7, 3, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 0, 1, 9, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 4, 1, 9, 4, 7, 1, 7, 3, 1, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 2, 10, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 3, 4, 7, 3, 0, 4, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 2, 10, 9, 0, 2, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1 }, { 2, 10, 9, 2, 9, 7, 2, 7, 3, 7, 9, 4, -1, -1, -1, -1 },
        { 8, 4, 7, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 11, 4, 7, 11, 2, 4, 2, 0, 4, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 0, 1, 8, 4, 7, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1 }, { 4, 7, 11, 9, 4, 11, 9, 11, 2, 9, 2, 1, -1, -1, -1, -1 },
        { 3, 10, 1, 3, 11, 10, 7, 8, 4, -1, -1, -1, -1, -1, -1, -1 }, { 1, 11, 10, 1, 4, 11, 1, 0, 4, 7, 11, 4, -1, -1, -1, -1 },
        { 4, 7, 8, 9, 0, 11, 9, 11, 10, 11, 0, 3, -1, -1, -1, -1 }, { 4, 7, 11, 4, 11, 9, 9, 11, 10, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 9, 5, 4, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 0, 5, 4, 1, 5, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 8, 5, 4, 8, 3, 5, 3, 1, 5, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 2, 10, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 3, 0, 8, 1, 2, 10, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1 },
        { 5, 2, 10, 5, 4, 2, 4, 0, 2, -1, -1, -1, -1, -1, -1, -1 }, { 2, 10, 5, 3, 2, 5, 3, 5, 4, 3, 4, 8, -1, -1, -1, -1 },
        { 9, 5, 4, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 11, 2, 0, 8, 11, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1 },
        { 0, 5, 4, 0, 1, 5, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1 }, { 2, 1, 5, 2, 5, 8, 2, 8, 11, 4, 8, 5, -1, -1, -1, -1 },
        { 10, 3, 11, 10, 1, 3, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1 }, { 4, 9, 5, 0, 8, 1, 8, 10, 1, 8, 11, 10, -1, -1, -1, -1 },
        { 5, 4, 0, 5, 0, 11, 5, 11, 10, 11, 0, 3, -1, -1, -1, -1 }, { 5, 4, 8, 5, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 7, 8, 5, 7, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 9, 3, 0, 9, 5, 3, 5, 7, 3, -1, -1, -1, -1, -1, -1, -1 },
        { 0, 7, 8, 0, 1, 7, 1, 5, 7, -1, -1, -1, -1, -1, -1, -1 }, { 1, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 7, 8, 9, 5, 7, 10, 1, 2, -1, -1, -1, -1, -1, -1, -1 }, { 10, 1, 2, 9, 5, 0, 5, 3, 0, 5, 7, 3, -1, -1, -1, -1 },
        { 8, 0, 2, 8, 2, 5, 8, 5, 7, 10, 5, 2, -1, -1, -1, -1 }, { 2, 10, 5, 2, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1 },
        { 7, 9, 5, 7, 8, 9, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1 }, { 9, 5, 7, 9, 7, 2, 9, 2, 0, 2, 7, 11, -1, -1, -1, -1 },
        { 2, 3, 11, 0, 1, 8, 1, 7, 8, 1, 5, 7, -1, -1, -1, -1 }, { 11, 2, 1, 11, 1, 7, 7, 1, 5, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 5, 8, 8, 5, 7, 10, 1, 3, 10, 3, 11, -1, -1, -1, -1 }, { 5, 7, 0, 5, 0, 9, 7, 11, 0, 1, 0, 10, 11, 10, 0, -1 },
        { 11, 10, 0, 11, 0, 3, 10, 5, 0, 8, 0, 7, 5, 7, 0, -1 }, { 11, 10, 5, 7, 11, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 8, 3, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 0, 1, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 1, 8, 3, 1, 9, 8, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 6, 5, 2, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 1, 6, 5, 1, 2, 6, 3, 0, 8, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 6, 5, 9, 0, 6, 0, 2, 6, -1, -1, -1, -1, -1, -1, -1 }, { 5, 9, 8, 5, 8, 2, 5, 2, 6, 3, 2, 8, -1, -1, -1, -1 },
        { 2, 3, 11, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 11, 0, 8, 11, 2, 0, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1 },
        { 0, 1, 9, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1 }, { 5, 10, 6, 1, 9, 2, 9, 11, 2, 9, 8, 11, -1, -1, -1, -1 },
        { 6, 3, 11, 6, 5, 3, 5, 1, 3, -1, -1, -1, -1, -1, -1, -1 }, { 0, 8, 11, 0, 11, 5, 0, 5, 1, 5, 11, 6, -1, -1, -1, -1 },
        { 3, 11, 6, 0, 3, 6, 0, 6, 5, 0, 5, 9, -1, -1, -1, -1 }, { 6, 5, 9, 6, 9, 11, 11, 9, 8, -1, -1, -1, -1, -1, -1, -1 },
        { 5, 10, 6, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 4, 3, 0, 4, 7, 3, 6, 5, 10, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 9, 0, 5, 10, 6, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1 }, { 10, 6, 5, 1, 9, 7, 1, 7, 3, 7, 9, 4, -1, -1, -1, -1 },
        { 6, 1, 2, 6, 5, 1, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1 }, { 1, 2, 5, 5, 2, 6, 3, 0, 4, 3, 4, 7, -1, -1, -1, -1 },
        { 8, 4, 7, 9, 0, 5, 0, 6, 5, 0, 2, 6, -1, -1, -1, -1 }, { 7, 3, 9, 7, 9, 4, 3, 2, 9, 5, 9, 6, 2, 6, 9, -1 },
        { 3, 11, 2, 7, 8, 4, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1 }, { 5, 10, 6, 4, 7, 2, 4, 2, 0, 2, 7, 11, -1, -1, -1, -1 },
        { 0, 1, 9, 4, 7, 8, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1 }, { 9, 2, 1, 9, 11, 2, 9, 4, 11, 7, 11, 4, 5, 10, 6, -1 },
        { 8, 4, 7, 3, 11, 5, 3, 5, 1, 5, 11, 6, -1, -1, -1, -1 }, { 5, 1, 11, 5, 11, 6, 1, 0, 11, 7, 11, 4, 0, 4, 11, -1 },
        { 0, 5, 9, 0, 6, 5, 0, 3, 6, 11, 6, 3, 8, 4, 7, -1 }, { 6, 5, 9, 6, 9, 11, 4, 7, 9, 7, 11, 9, -1, -1, -1, -1 },
        { 10, 4, 9, 6, 4, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 4, 10, 6, 4, 9, 10, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1 },
        { 10, 0, 1, 10, 6, 0, 6, 4, 0, -1, -1, -1, -1, -1, -1, -1 }, { 8, 3, 1, 8, 1, 6, 8, 6, 4, 6, 1, 10, -1, -1, -1, -1 },
        { 1, 4, 9, 1, 2, 4, 2, 6, 4, -1, -1, -1, -1, -1, -1, -1 }, { 3, 0, 8, 1, 2, 9, 2, 4, 9, 2, 6, 4, -1, -1, -1, -1 },
        { 0, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 8, 3, 2, 8, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1 },
        { 10, 4, 9, 10, 6, 4, 11, 2, 3, -1, -1, -1, -1, -1, -1, -1 }, { 0, 8, 2, 2, 8, 11, 4, 9, 10, 4, 10, 6, -1, -1, -1, -1 },
        { 3, 11, 2, 0, 1, 6, 0, 6, 4, 6, 1, 10, -1, -1, -1, -1 }, { 6, 4, 1, 6, 1, 10, 4, 8, 1, 2, 1, 11, 8, 11, 1, -1 },
        { 9, 6, 4, 9, 3, 6, 9, 1, 3, 11, 6, 3, -1, -1, -1, -1 }, { 8, 11, 1, 8, 1, 0, 11, 6, 1, 9, 1, 4, 6, 4, 1, -1 },
        { 3, 11, 6, 3, 6, 0, 0, 6, 4, -1, -1, -1, -1, -1, -1, -1 }, { 6, 4, 8, 11, 6, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 7, 10, 6, 7, 8, 10, 8, 9, 10, -1, -1, -1, -1, -1, -1, -1 }, { 0, 7, 3, 0, 10, 7, 0, 9, 10, 6, 7, 10, -1, -1, -1, -1 },
        { 10, 6, 7, 1, 10, 7, 1, 7, 8, 1, 8, 0, -1, -1, -1, -1 }, { 10, 6, 7, 10, 7, 1, 1, 7, 3, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 2, 6, 1, 6, 8, 1, 8, 9, 8, 6, 7, -1, -1, -1, -1 }, { 2, 6, 9, 2, 9, 1, 6, 7, 9, 0, 9, 3, 7, 3, 9, -1 },
        { 7, 8, 0, 7, 0, 6, 6, 0, 2, -1, -1, -1, -1, -1, -1, -1 }, { 7, 3, 2, 6, 7, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 2, 3, 11, 10, 6, 8, 10, 8, 9, 8, 6, 7, -1, -1, -1, -1 }, { 2, 0, 7, 2, 7, 11, 0, 9, 7, 6, 7, 10, 9, 10, 7, -1 },
        { 1, 8, 0, 1, 7, 8, 1, 10, 7, 6, 7, 10, 2, 3, 11, -1 }, { 11, 2, 1, 11, 1, 7, 10, 6, 1, 6, 7, 1, -1, -1, -1, -1 },
        { 8, 9, 6, 8, 6, 7, 9, 1, 6, 11, 6, 3, 1, 3, 6, -1 }, { 0, 9, 1, 11, 6, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 7, 8, 0, 7, 0, 6, 3, 11, 0, 11, 6, 0, -1, -1, -1, -1 }, { 7, 11, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 3, 0, 8, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 0, 1, 9, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 8, 1, 9, 8, 3, 1, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1 },
        { 10, 1, 2, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 1, 2, 10, 3, 0, 8, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1 },
        { 2, 9, 0, 2, 10, 9, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1 }, { 6, 11, 7, 2, 10, 3, 10, 8, 3, 10, 9, 8, -1, -1, -1, -1 },
        { 7, 2, 3, 6, 2, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 7, 0, 8, 7, 6, 0, 6, 2, 0, -1, -1, -1, -1, -1, -1, -1 },
        { 2, 7, 6, 2, 3, 7, 0, 1, 9, -1, -1, -1, -1, -1, -1, -1 }, { 1, 6, 2, 1, 8, 6, 1, 9, 8, 8, 7, 6, -1, -1, -1, -1 },
        { 10, 7, 6, 10, 1, 7, 1, 3, 7, -1, -1, -1, -1, -1, -1, -1 }, { 10, 7, 6, 1, 7, 10, 1, 8, 7, 1, 0, 8, -1, -1, -1, -1 },
        { 0, 3, 7, 0, 7, 10, 0, 10, 9, 6, 10, 7, -1, -1, -1, -1 }, { 7, 6, 10, 7, 10, 8, 8, 10, 9, -1, -1, -1, -1, -1, -1, -1 },
        { 6, 8, 4, 11, 8, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 3, 6, 11, 3, 0, 6, 0, 4, 6, -1, -1, -1, -1, -1, -1, -1 },
        { 8, 6, 11, 8, 4, 6, 9, 0, 1, -1, -1, -1, -1, -1, -1, -1 }, { 9, 4, 6, 9, 6, 3, 9, 3, 1, 11, 3, 6, -1, -1, -1, -1 },
        { 6, 8, 4, 6, 11, 8, 2, 10, 1, -1, -1, -1, -1, -1, -1, -1 }, { 1, 2, 10, 3, 0, 11, 0, 6, 11, 0, 4, 6, -1, -1, -1, -1 },
        { 4, 11, 8, 4, 6, 11, 0, 2, 9, 2, 10, 9, -1, -1, -1, -1 }, { 10, 9, 3, 10, 3, 2, 9, 4, 3, 11, 3, 6, 4, 6, 3, -1 },
        { 8, 2, 3, 8, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1 }, { 0, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 9, 0, 2, 3, 4, 2, 4, 6, 4, 3, 8, -1, -1, -1, -1 }, { 1, 9, 4, 1, 4, 2, 2, 4, 6, -1, -1, -1, -1, -1, -1, -1 },
        { 8, 1, 3, 8, 6, 1, 8, 4, 6, 6, 10, 1, -1, -1, -1, -1 }, { 10, 1, 0, 10, 0, 6, 6, 0, 4, -1, -1, -1, -1, -1, -1, -1 },
        { 4, 6, 3, 4, 3, 8, 6, 10, 3, 0, 3, 9, 10, 9, 3, -1 }, { 10, 9, 4, 6, 10, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 4, 9, 5, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 8, 3, 4, 9, 5, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1 },
        { 5, 0, 1, 5, 4, 0, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1 }, { 11, 7, 6, 8, 3, 4, 3, 5, 4, 3, 1, 5, -1, -1, -1, -1 },
        { 9, 5, 4, 10, 1, 2, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1 }, { 6, 11, 7, 1, 2, 10, 0, 8, 3, 4, 9, 5, -1, -1, -1, -1 },
        { 7, 6, 11, 5, 4, 10, 4, 2, 10, 4, 0, 2, -1, -1, -1, -1 }, { 3, 4, 8, 3, 5, 4, 3, 2, 5, 10, 5, 2, 11, 7, 6, -1 },
        { 7, 2, 3, 7, 6, 2, 5, 4, 9, -1, -1, -1, -1, -1, -1, -1 }, { 9, 5, 4, 0, 8, 6, 0, 6, 2, 6, 8, 7, -1, -1, -1, -1 },
        { 3, 6, 2, 3, 7, 6, 1, 5, 0, 5, 4, 0, -1, -1, -1, -1 }, { 6, 2, 8, 6, 8, 7, 2, 1, 8, 4, 8, 5, 1, 5, 8, -1 },
        { 9, 5, 4, 10, 1, 6, 1, 7, 6, 1, 3, 7, -1, -1, -1, -1 }, { 1, 6, 10, 1, 7, 6, 1, 0, 7, 8, 7, 0, 9, 5, 4, -1 },
        { 4, 0, 10, 4, 10, 5, 0, 3, 10, 6, 10, 7, 3, 7, 10, -1 }, { 7, 6, 10, 7, 10, 8, 5, 4, 10, 4, 8, 10, -1, -1, -1, -1 },
        { 6, 9, 5, 6, 11, 9, 11, 8, 9, -1, -1, -1, -1, -1, -1, -1 }, { 3, 6, 11, 0, 6, 3, 0, 5, 6, 0, 9, 5, -1, -1, -1, -1 },
        { 0, 11, 8, 0, 5, 11, 0, 1, 5, 5, 6, 11, -1, -1, -1, -1 }, { 6, 11, 3, 6, 3, 5, 5, 3, 1, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 2, 10, 9, 5, 11, 9, 11, 8, 11, 5, 6, -1, -1, -1, -1 }, { 0, 11, 3, 0, 6, 11, 0, 9, 6, 5, 6, 9, 1, 2, 10, -1 },
        { 11, 8, 5, 11, 5, 6, 8, 0, 5, 10, 5, 2, 0, 2, 5, -1 }, { 6, 11, 3, 6, 3, 5, 2, 10, 3, 10, 5, 3, -1, -1, -1, -1 },
        { 5, 8, 9, 5, 2, 8, 5, 6, 2, 3, 8, 2, -1, -1, -1, -1 }, { 9, 5, 6, 9, 6, 0, 0, 6, 2, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 5, 8, 1, 8, 0, 5, 6, 8, 3, 8, 2, 6, 2, 8, -1 }, { 1, 5, 6, 2, 1, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 3, 6, 1, 6, 10, 3, 8, 6, 5, 6, 9, 8, 9, 6, -1 }, { 10, 1, 0, 10, 0, 6, 9, 5, 0, 5, 6, 0, -1, -1, -1, -1 },
        { 0, 3, 8, 5, 6, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 10, 5, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 11, 5, 10, 7, 5, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 11, 5, 10, 11, 7, 5, 8, 3, 0, -1, -1, -1, -1, -1, -1, -1 },
        { 5, 11, 7, 5, 10, 11, 1, 9, 0, -1, -1, -1, -1, -1, -1, -1 }, { 10, 7, 5, 10, 11, 7, 9, 8, 1, 8, 3, 1, -1, -1, -1, -1 },
        { 11, 1, 2, 11, 7, 1, 7, 5, 1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 8, 3, 1, 2, 7, 1, 7, 5, 7, 2, 11, -1, -1, -1, -1 },
        { 9, 7, 5, 9, 2, 7, 9, 0, 2, 2, 11, 7, -1, -1, -1, -1 }, { 7, 5, 2, 7, 2, 11, 5, 9, 2, 3, 2, 8, 9, 8, 2, -1 },
        { 2, 5, 10, 2, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1 }, { 8, 2, 0, 8, 5, 2, 8, 7, 5, 10, 2, 5, -1, -1, -1, -1 },
        { 9, 0, 1, 5, 10, 3, 5, 3, 7, 3, 10, 2, -1, -1, -1, -1 }, { 9, 8, 2, 9, 2, 1, 8, 7, 2, 10, 2, 5, 7, 5, 2, -1 },
        { 1, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 8, 7, 0, 7, 1, 1, 7, 5, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 0, 3, 9, 3, 5, 5, 3, 7, -1, -1, -1, -1, -1, -1, -1 }, { 9, 8, 7, 5, 9, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 5, 8, 4, 5, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1 }, { 5, 0, 4, 5, 11, 0, 5, 10, 11, 11, 3, 0, -1, -1, -1, -1 },
        { 0, 1, 9, 8, 4, 10, 8, 10, 11, 10, 4, 5, -1, -1, -1, -1 }, { 10, 11, 4, 10, 4, 5, 11, 3, 4, 9, 4, 1, 3, 1, 4, -1 },
        { 2, 5, 1, 2, 8, 5, 2, 11, 8, 4, 5, 8, -1, -1, -1, -1 }, { 0, 4, 11, 0, 11, 3, 4, 5, 11, 2, 11, 1, 5, 1, 11, -1 },
        { 0, 2, 5, 0, 5, 9, 2, 11, 5, 4, 5, 8, 11, 8, 5, -1 }, { 9, 4, 5, 2, 11, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 2, 5, 10, 3, 5, 2, 3, 4, 5, 3, 8, 4, -1, -1, -1, -1 }, { 5, 10, 2, 5, 2, 4, 4, 2, 0, -1, -1, -1, -1, -1, -1, -1 },
        { 3, 10, 2, 3, 5, 10, 3, 8, 5, 4, 5, 8, 0, 1, 9, -1 }, { 5, 10, 2, 5, 2, 4, 1, 9, 2, 9, 4, 2, -1, -1, -1, -1 },
        { 8, 4, 5, 8, 5, 3, 3, 5, 1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 4, 5, 1, 0, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 8, 4, 5, 8, 5, 3, 9, 0, 5, 0, 3, 5, -1, -1, -1, -1 }, { 9, 4, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 4, 11, 7, 4, 9, 11, 9, 10, 11, -1, -1, -1, -1, -1, -1, -1 }, { 0, 8, 3, 4, 9, 7, 9, 11, 7, 9, 10, 11, -1, -1, -1, -1 },
        { 1, 10, 11, 1, 11, 4, 1, 4, 0, 7, 4, 11, -1, -1, -1, -1 }, { 3, 1, 4, 3, 4, 8, 1, 10, 4, 7, 4, 11, 10, 11, 4, -1 },
        { 4, 11, 7, 9, 11, 4, 9, 2, 11, 9, 1, 2, -1, -1, -1, -1 }, { 9, 7, 4, 9, 11, 7, 9, 1, 11, 2, 11, 1, 0, 8, 3, -1 },
        { 11, 7, 4, 11, 4, 2, 2, 4, 0, -1, -1, -1, -1, -1, -1, -1 }, { 11, 7, 4, 11, 4, 2, 8, 3, 4, 3, 2, 4, -1, -1, -1, -1 },
        { 2, 9, 10, 2, 7, 9, 2, 3, 7, 7, 4, 9, -1, -1, -1, -1 }, { 9, 10, 7, 9, 7, 4, 10, 2, 7, 8, 7, 0, 2, 0, 7, -1 },
        { 3, 7, 10, 3, 10, 2, 7, 4, 10, 1, 10, 0, 4, 0, 10, -1 }, { 1, 10, 2, 8, 7, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 4, 9, 1, 4, 1, 7, 7, 1, 3, -1, -1, -1, -1, -1, -1, -1 }, { 4, 9, 1, 4, 1, 7, 0, 8, 1, 8, 7, 1, -1, -1, -1, -1 },
        { 4, 0, 3, 7, 4, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 4, 8, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 9, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 3, 0, 9, 3, 9, 11, 11, 9, 10, -1, -1, -1, -1, -1, -1, -1 },
        { 0, 1, 10, 0, 10, 8, 8, 10, 11, -1, -1, -1, -1, -1, -1, -1 }, { 3, 1, 10, 11, 3, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 2, 11, 1, 11, 9, 9, 11, 8, -1, -1, -1, -1, -1, -1, -1 }, { 3, 0, 9, 3, 9, 11, 1, 2, 9, 2, 11, 9, -1, -1, -1, -1 },
        { 0, 2, 11, 8, 0, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 3, 2, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 2, 3, 8, 2, 8, 10, 10, 8, 9, -1, -1, -1, -1, -1, -1, -1 }, { 9, 10, 2, 0, 9, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 2, 3, 8, 2, 8, 10, 0, 1, 8, 1, 10, 8, -1, -1, -1, -1 }, { 1, 10, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 1, 3, 8, 9, 1, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { 0, 9, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
        { 0, 3, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }
      };

      const unsigned int
        _nx = (unsigned int)(size_x>=0?size_x:((x1-x0)*-size_x/100 + 1)),
        _ny = (unsigned int)(size_y>=0?size_y:((y1-y0)*-size_y/100 + 1)),
        _nz = (unsigned int)(size_z>=0?size_y:((z1-z0)*-size_z/100 + 1)),
        nx = _nx?_nx:1,
        ny = _ny?_ny:1,
        nz = _nz?_nz:1,
        nxm1 = nx - 1,
        nym1 = ny - 1,
        nzm1 = nz - 1;
      primitives.assign();
      if (!nxm1 || !nym1 || !nzm1) return CImg<floatT>();
      const float dx = (x1 - x0)/nxm1, dy = (y1 - y0)/nym1, dz = (z1 - z0)/nzm1;
      CImgList<floatT> vertices;
      CImg<intT> indices1(nx,ny,1,3,-1), indices2(indices1);
      CImg<floatT> values1(nx,ny), values2(nx,ny);
      float X = 0, Y = 0, Z = 0, nX = 0, nY = 0, nZ = 0;

      // Fill the first plane with function values
      Y = y0;
      cimg_forY(values1,y) {
        X = x0;
        cimg_forX(values1,x) { values1(x,y) = (float)func(X,Y,z0); X+=dx; }
        Y+=dy;
      }

      // Run Marching Cubes algorithm
      Z = z0; nZ = Z + dz;
      for (unsigned int zi = 0; zi<nzm1; ++zi, Z = nZ, nZ+=dz) {
        Y = y0; nY = Y + dy;
        indices2.fill(-1);
        for (unsigned int yi = 0, nyi = 1; yi<nym1; ++yi, ++nyi, Y = nY, nY+=dy) {
          X = x0; nX = X + dx;
          for (unsigned int xi = 0, nxi = 1; xi<nxm1; ++xi, ++nxi, X = nX, nX+=dx) {

            // Determine cube configuration
            const float
              val0 = values1(xi,yi),
              val1 = values1(nxi,yi),
              val2 = values1(nxi,nyi),
              val3 = values1(xi,nyi),
              val4 = values2(xi,yi) = (float)func(X,Y,nZ),
              val5 = values2(nxi,yi) = (float)func(nX,Y,nZ),
              val6 = values2(nxi,nyi) = (float)func(nX,nY,nZ),
              val7 = values2(xi,nyi) = (float)func(X,nY,nZ);

            const unsigned int configuration =
              (val0<isovalue?1:0)  | (val1<isovalue?2:0)  | (val2<isovalue?4:0)  | (val3<isovalue?8:0) |
              (val4<isovalue?16:0) | (val5<isovalue?32:0) | (val6<isovalue?64:0) | (val7<isovalue?128:0),
              edge = edges[configuration];

            // Compute intersection vertices
            if (edge) {
              if ((edge&1) && indices1(xi,yi,0)<0) {
                const float Xi = X + (isovalue-val0)*dx/(val1-val0);
                indices1(xi,yi,0) = vertices._width;
                CImg<floatT>::vector(Xi,Y,Z).move_to(vertices);
              }
              if ((edge&2) && indices1(nxi,yi,1)<0) {
                const float Yi = Y + (isovalue-val1)*dy/(val2-val1);
                indices1(nxi,yi,1) = vertices._width;
                CImg<floatT>::vector(nX,Yi,Z).move_to(vertices);
              }
              if ((edge&4) && indices1(xi,nyi,0)<0) {
                const float Xi = X + (isovalue-val3)*dx/(val2-val3);
                indices1(xi,nyi,0) = vertices._width;
                CImg<floatT>::vector(Xi,nY,Z).move_to(vertices);
              }
              if ((edge&8) && indices1(xi,yi,1)<0) {
                const float Yi = Y + (isovalue-val0)*dy/(val3-val0);
                indices1(xi,yi,1) = vertices._width;
                CImg<floatT>::vector(X,Yi,Z).move_to(vertices);
              }
              if ((edge&16) && indices2(xi,yi,0)<0) {
                const float Xi = X + (isovalue-val4)*dx/(val5-val4);
                indices2(xi,yi,0) = vertices._width;
                CImg<floatT>::vector(Xi,Y,nZ).move_to(vertices);
              }
              if ((edge&32) && indices2(nxi,yi,1)<0) {
                const float Yi = Y + (isovalue-val5)*dy/(val6-val5);
                indices2(nxi,yi,1) = vertices._width;
                CImg<floatT>::vector(nX,Yi,nZ).move_to(vertices);
              }
              if ((edge&64) && indices2(xi,nyi,0)<0) {
                const float Xi = X + (isovalue-val7)*dx/(val6-val7);
                indices2(xi,nyi,0) = vertices._width;
                CImg<floatT>::vector(Xi,nY,nZ).move_to(vertices);
              }
              if ((edge&128) && indices2(xi,yi,1)<0)  {
                const float Yi = Y + (isovalue-val4)*dy/(val7-val4);
                indices2(xi,yi,1) = vertices._width;
                CImg<floatT>::vector(X,Yi,nZ).move_to(vertices);
              }
              if ((edge&256) && indices1(xi,yi,2)<0) {
                const float Zi = Z+ (isovalue-val0)*dz/(val4-val0);
                indices1(xi,yi,2) = vertices._width;
                CImg<floatT>::vector(X,Y,Zi).move_to(vertices);
              }
              if ((edge&512) && indices1(nxi,yi,2)<0)  {
                const float Zi = Z + (isovalue-val1)*dz/(val5-val1);
                indices1(nxi,yi,2) = vertices._width;
                CImg<floatT>::vector(nX,Y,Zi).move_to(vertices);
              }
              if ((edge&1024) && indices1(nxi,nyi,2)<0) {
                const float Zi = Z + (isovalue-val2)*dz/(val6-val2);
                indices1(nxi,nyi,2) = vertices._width;
                CImg<floatT>::vector(nX,nY,Zi).move_to(vertices);
              }
              if ((edge&2048) && indices1(xi,nyi,2)<0) {
                const float Zi = Z + (isovalue-val3)*dz/(val7-val3);
                indices1(xi,nyi,2) = vertices._width;
                CImg<floatT>::vector(X,nY,Zi).move_to(vertices);
              }

              // Create triangles
              for (const int *triangle = triangles[configuration]; *triangle!=-1; ) {
                const unsigned int p0 = *(triangle++), p1 = *(triangle++), p2 = *(triangle++);
                const tf
                  i0 = (tf)(_isosurface3d_indice(p0,indices1,indices2,xi,yi,nxi,nyi)),
                  i1 = (tf)(_isosurface3d_indice(p1,indices1,indices2,xi,yi,nxi,nyi)),
                  i2 = (tf)(_isosurface3d_indice(p2,indices1,indices2,xi,yi,nxi,nyi));
                CImg<tf>::vector(i0,i2,i1).move_to(primitives);
              }
            }
          }
        }
        cimg::swap(values1,values2);
        cimg::swap(indices1,indices2);
      }
      return vertices>'x';
    }

    template<typename tf>
    static CImg<floatT> isosurface3d(CImgList<tf>& primitives, const char *const expression, const float isovalue,
                                     const float x0, const float y0, const float z0,
                                     const float x1, const float y1, const float z1,
                                     const int dx=32, const int dy=32, const int dz=32) {
      const _functor3d_expr func(expression);
      return isosurface3d(primitives,func,isovalue,x0,y0,z0,x1,y1,z1,dx,dy,dz);
    }

    template<typename t>
    static int _isosurface3d_indice(const unsigned int edge, const CImg<t>& indices1, const CImg<t>& indices2,
                                    const unsigned int x, const unsigned int y, const unsigned int nx, const unsigned int ny) {
      switch (edge) {
      case 0 : return indices1(x,y,0);
      case 1 : return indices1(nx,y,1);
      case 2 : return indices1(x,ny,0);
      case 3 : return indices1(x,y,1);
      case 4 : return indices2(x,y,0);
      case 5 : return indices2(nx,y,1);
      case 6 : return indices2(x,ny,0);
      case 7 : return indices2(x,y,1);
      case 8 : return indices1(x,y,2);
      case 9 : return indices1(nx,y,2);
      case 10 : return indices1(nx,ny,2);
      case 11 : return indices1(x,ny,2);
      }
      return 0;
    }

    // Define functors for accessing image values (used in previous functions).
    struct _functor2d_int {
      const CImg<T>& ref;
      _functor2d_int(const CImg<T>& pref):ref(pref) {}
      float operator()(const float x, const float y) const {
        return (float)ref((int)x,(int)y);
      }
    };

    struct _functor2d_float {
      const CImg<T>& ref;
      _functor2d_float(const CImg<T>& pref):ref(pref) {}
      float operator()(const float x, const float y) const {
        return (float)ref._linear_atXY(x,y);
      }
    };

    struct _functor2d_expr {
      _cimg_math_parser *mp;
      _functor2d_expr(const char *const expr):mp(0) { mp = new _cimg_math_parser(CImg<T>::empty(),expr,0); }
      ~_functor2d_expr() { delete mp; }
      float operator()(const float x, const float y) const {
        return (float)mp->eval(x,y,0,0);
      }
    };

    struct _functor3d_int {
      const CImg<T>& ref;
      _functor3d_int(const CImg<T>& pref):ref(pref) {}
      float operator()(const float x, const float y, const float z) const {
        return (float)ref((int)x,(int)y,(int)z);
      }
    };

    struct _functor3d_float {
      const CImg<T>& ref;
      _functor3d_float(const CImg<T>& pref):ref(pref) {}
      float operator()(const float x, const float y, const float z) const {
        return (float)ref._linear_atXYZ(x,y,z);
      }
    };

    struct _functor3d_expr {
      _cimg_math_parser *mp;
      ~_functor3d_expr() { delete mp; }
      _functor3d_expr(const char *const expr):mp(0) { mp = new _cimg_math_parser(CImg<T>::empty(),expr,0); }
      float operator()(const float x, const float y, const float z) const {
        return (float)mp->eval(x,y,z,0);
      }
    };

    struct _functor4d_int {
      const CImg<T>& ref;
      _functor4d_int(const CImg<T>& pref):ref(pref) {}
      float operator()(const float x, const float y, const float z, const unsigned int c) const {
        return (float)ref((int)x,(int)y,(int)z,c);
      }
    };

    //! Create and return a 3d box object.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param size_x The width of the box (dimension along the X-axis).
       \param size_y The height of the box (dimension along the Y-axis).
       \param size_z The depth of the box (dimension along the Z-axis).
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       CImgList<unsigned int> faces3d;
       const CImg<float> points3d = CImg<float>::box3d(faces3d,10,20,30);
       CImg<unsigned char>().display_object3d("Box3d",points3d,faces3d);
       \endcode
       \image html ref_box3d.jpg
    **/
    template<typename tf>
    static CImg<floatT> box3d(CImgList<tf>& primitives,
                              const float size_x=200, const float size_y=100, const float size_z=100) {
      primitives.assign(6,1,4,1,1, 0,3,2,1, 4,5,6,7, 0,1,5,4, 3,7,6,2, 0,4,7,3, 1,2,6,5);
      return CImg<floatT>(8,3,1,1,
                          0.,size_x,size_x,    0.,    0.,size_x,size_x,    0.,
                          0.,    0.,size_y,size_y,    0.,    0.,size_y,size_y,
                          0.,    0.,    0.,    0.,size_z,size_z,size_z,size_z);
    }

    //! Create and return a 3d cone.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param radius The radius of the cone basis.
       \param size_z The cone's height.
       \param subdivisions The number of basis angular subdivisions.
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       CImgList<unsigned int> faces3d;
       const CImg<float> points3d = CImg<float>::cone3d(faces3d,50);
       CImg<unsigned char>().display_object3d("Cone3d",points3d,faces3d);
       \endcode
       \image html ref_cone3d.jpg
    **/
    template<typename tf>
    static CImg<floatT> cone3d(CImgList<tf>& primitives,
                               const float radius=50, const float size_z=100, const unsigned int subdivisions=24) {
      primitives.assign();
      if (!subdivisions) return CImg<floatT>();
      CImgList<floatT> vertices(2,1,3,1,1,
                                0.,0.,size_z,
                                0.,0.,0.);
      for (float delta = 360.0f/subdivisions, angle = 0; angle<360; angle+=delta) {
        const float a = (float)(angle*cimg::PI/180);
        CImg<floatT>::vector((float)(radius*std::cos(a)),(float)(radius*std::sin(a)),0).move_to(vertices);
      }
      const unsigned int nbr = vertices._width - 2;
      for (unsigned int p = 0; p<nbr; ++p) {
        const unsigned int curr = 2 + p, next = 2 + ((p+1)%nbr);
        CImg<tf>::vector(1,next,curr).move_to(primitives);
        CImg<tf>::vector(0,curr,next).move_to(primitives);
      }
      return vertices>'x';
    }

    //! Create and return a 3d cylinder.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param radius The radius of the cylinder basis.
       \param size_z The cylinder's height.
       \param subdivisions The number of basis angular subdivisions.
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       CImgList<unsigned int> faces3d;
       const CImg<float> points3d = CImg<float>::cylinder3d(faces3d,50);
       CImg<unsigned char>().display_object3d("Cylinder3d",points3d,faces3d);
       \endcode
       \image html ref_cylinder3d.jpg
    **/
    template<typename tf>
    static CImg<floatT> cylinder3d(CImgList<tf>& primitives,
                                   const float radius=50, const float size_z=100, const unsigned int subdivisions=24) {
      primitives.assign();
      if (!subdivisions) return CImg<floatT>();
      CImgList<floatT> vertices(2,1,3,1,1,
                                0.,0.,0.,
                                0.,0.,size_z);
      for (float delta = 360.0f/subdivisions, angle = 0; angle<360; angle+=delta) {
        const float a = (float)(angle*cimg::PI/180);
        CImg<floatT>::vector((float)(radius*std::cos(a)),(float)(radius*std::sin(a)),0.0f).move_to(vertices);
        CImg<floatT>::vector((float)(radius*std::cos(a)),(float)(radius*std::sin(a)),size_z).move_to(vertices);
      }
      const unsigned int nbr = (vertices._width - 2)/2;
      for (unsigned int p = 0; p<nbr; ++p) {
        const unsigned int curr = 2+2*p, next = 2+(2*((p+1)%nbr));
        CImg<tf>::vector(0,next,curr).move_to(primitives);
        CImg<tf>::vector(1,curr+1,next+1).move_to(primitives);
        CImg<tf>::vector(curr,next,next+1,curr+1).move_to(primitives);
      }
      return vertices>'x';
    }

    //! Create and return a 3d torus.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param radius1 The large radius.
       \param radius2 The small radius.
       \param subdivisions1 The number of angular subdivisions for the large radius.
       \param subdivisions2 The number of angular subdivisions for the small radius.
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       CImgList<unsigned int> faces3d;
       const CImg<float> points3d = CImg<float>::torus3d(faces3d,20,4);
       CImg<unsigned char>().display_object3d("Torus3d",points3d,faces3d);
       \endcode
       \image html ref_torus3d.jpg
    **/
    template<typename tf>
    static CImg<floatT> torus3d(CImgList<tf>& primitives,
                                const float radius1=100, const float radius2=30,
                                const unsigned int subdivisions1=24, const unsigned int subdivisions2=12) {
      primitives.assign();
      if (!subdivisions1 || !subdivisions2) return CImg<floatT>();
      CImgList<floatT> vertices;
      for (unsigned int v = 0; v<subdivisions1; ++v) {
        const float
          beta = (float)(v*2*cimg::PI/subdivisions1),
          xc = radius1*(float)std::cos(beta),
          yc = radius1*(float)std::sin(beta);
        for (unsigned int u = 0; u<subdivisions2; ++u) {
          const float
            alpha = (float)(u*2*cimg::PI/subdivisions2),
            x = xc + radius2*(float)(std::cos(alpha)*std::cos(beta)),
            y = yc + radius2*(float)(std::cos(alpha)*std::sin(beta)),
            z = radius2*(float)std::sin(alpha);
          CImg<floatT>::vector(x,y,z).move_to(vertices);
        }
      }
      for (unsigned int vv = 0; vv<subdivisions1; ++vv) {
        const unsigned int nv = (vv+1)%subdivisions1;
        for (unsigned int uu = 0; uu<subdivisions2; ++uu) {
          const unsigned int nu = (uu+1)%subdivisions2, svv = subdivisions2*vv, snv = subdivisions2*nv;
          CImg<tf>::vector(svv+nu,svv+uu,snv+uu).move_to(primitives);
          CImg<tf>::vector(svv+nu,snv+uu,snv+nu).move_to(primitives);
        }
      }
      return vertices>'x';
    }

    //! Create and return a 3d XY-plane.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param size_x The width of the plane (dimension along the X-axis).
       \param size_y The height of the plane (dimensions along the Y-axis).
       \param subdivisions_x The number of planar subdivisions along the X-axis.
       \param subdivisions_y The number of planar subdivisions along the Y-axis.
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       CImgList<unsigned int> faces3d;
       const CImg<float> points3d = CImg<float>::plane3d(faces3d,100,50);
       CImg<unsigned char>().display_object3d("Plane3d",points3d,faces3d);
       \endcode
       \image html ref_plane3d.jpg
    **/
    template<typename tf>
    static CImg<floatT> plane3d(CImgList<tf>& primitives,
                                const float size_x=100, const float size_y=100,
                                const unsigned int subdivisions_x=10, const unsigned int subdivisions_y=10) {
      primitives.assign();
      if (!subdivisions_x || !subdivisions_y) return CImg<floatT>();
      CImgList<floatT> vertices;
      const unsigned int w = subdivisions_x + 1, h = subdivisions_y + 1;
      const float fx = (float)size_x/w, fy = (float)size_y/h;
      for (unsigned int y = 0; y<h; ++y) for (unsigned int x = 0; x<w; ++x)
        CImg<floatT>::vector(fx*x,fy*y,0).move_to(vertices);
      for (unsigned int y = 0; y<subdivisions_y; ++y) for (unsigned int x = 0; x<subdivisions_x; ++x) {
        const int off1 = x+y*w, off2 = x+1+y*w, off3 = x+1+(y+1)*w, off4 = x+(y+1)*w;
        CImg<tf>::vector(off1,off4,off3,off2).move_to(primitives);
      }
      return vertices>'x';
    }

    //! Create and return a 3d sphere.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param radius The radius of the sphere (dimension along the X-axis).
       \param subdivisions The number of recursive subdivisions from an initial icosahedron.
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       CImgList<unsigned int> faces3d;
       const CImg<float> points3d = CImg<float>::sphere3d(faces3d,100,4);
       CImg<unsigned char>().display_object3d("Sphere3d",points3d,faces3d);
       \endcode
       \image html ref_sphere3d.jpg
    **/
    template<typename tf>
    static CImg<floatT> sphere3d(CImgList<tf>& primitives,
                                 const float radius=50, const unsigned int subdivisions=3) {

      // Create initial icosahedron
      primitives.assign();
      const double tmp = (1+std::sqrt(5.0f))/2, a = 1.0/std::sqrt(1+tmp*tmp), b = tmp*a;
      CImgList<floatT> vertices(12,1,3,1,1, b,a,0.0, -b,a,0.0, -b,-a,0.0, b,-a,0.0, a,0.0,b, a,0.0,-b,
                                -a,0.0,-b, -a,0.0,b, 0.0,b,a, 0.0,-b,a, 0.0,-b,-a, 0.0,b,-a);
      primitives.assign(20,1,3,1,1, 4,8,7, 4,7,9, 5,6,11, 5,10,6, 0,4,3, 0,3,5, 2,7,1, 2,1,6,
                        8,0,11, 8,11,1, 9,10,3, 9,2,10, 8,4,0, 11,0,5, 4,9,3,
                        5,3,10, 7,8,1, 6,1,11, 7,2,9, 6,10,2);
      // edge - length/2
      float he = (float)a;

      // Recurse subdivisions
      for (unsigned int i = 0; i<subdivisions; ++i) {
        const unsigned int L = primitives._width;
        he/=2;
        const float he2 = he*he;
        for (unsigned int l = 0; l<L; ++l) {
          const unsigned int
            p0 = (unsigned int)primitives(0,0), p1 = (unsigned int)primitives(0,1), p2 = (unsigned int)primitives(0,2);
          const float
            x0 = vertices(p0,0), y0 = vertices(p0,1), z0 = vertices(p0,2),
            x1 = vertices(p1,0), y1 = vertices(p1,1), z1 = vertices(p1,2),
            x2 = vertices(p2,0), y2 = vertices(p2,1), z2 = vertices(p2,2),
            tnx0 = (x0+x1)/2, tny0 = (y0+y1)/2, tnz0 = (z0+z1)/2, nn0 = (float)std::sqrt(tnx0*tnx0+tny0*tny0+tnz0*tnz0),
            tnx1 = (x0+x2)/2, tny1 = (y0+y2)/2, tnz1 = (z0+z2)/2, nn1 = (float)std::sqrt(tnx1*tnx1+tny1*tny1+tnz1*tnz1),
            tnx2 = (x1+x2)/2, tny2 = (y1+y2)/2, tnz2 = (z1+z2)/2, nn2 = (float)std::sqrt(tnx2*tnx2+tny2*tny2+tnz2*tnz2),
            nx0 = tnx0/nn0, ny0 = tny0/nn0, nz0 = tnz0/nn0,
            nx1 = tnx1/nn1, ny1 = tny1/nn1, nz1 = tnz1/nn1,
            nx2 = tnx2/nn2, ny2 = tny2/nn2, nz2 = tnz2/nn2;
          int i0 = -1, i1 = -1, i2 = -1;
          cimglist_for(vertices,p) {
            const float x = (float)vertices(p,0), y = (float)vertices(p,1), z = (float)vertices(p,2);
            if (cimg::sqr(x-nx0) + cimg::sqr(y-ny0) + cimg::sqr(z-nz0)<he2) i0 = p;
            if (cimg::sqr(x-nx1) + cimg::sqr(y-ny1) + cimg::sqr(z-nz1)<he2) i1 = p;
            if (cimg::sqr(x-nx2) + cimg::sqr(y-ny2) + cimg::sqr(z-nz2)<he2) i2 = p;
          }
          if (i0<0) { CImg<floatT>::vector(nx0,ny0,nz0).move_to(vertices); i0 = vertices._width - 1; }
          if (i1<0) { CImg<floatT>::vector(nx1,ny1,nz1).move_to(vertices); i1 = vertices._width - 1; }
          if (i2<0) { CImg<floatT>::vector(nx2,ny2,nz2).move_to(vertices); i2 = vertices._width - 1; }
          primitives.remove(0);
          CImg<tf>::vector(p0,i0,i1).move_to(primitives);
          CImg<tf>::vector((tf)i0,(tf)p1,(tf)i2).move_to(primitives);
          CImg<tf>::vector((tf)i1,(tf)i2,(tf)p2).move_to(primitives);
          CImg<tf>::vector((tf)i1,(tf)i0,(tf)i2).move_to(primitives);
        }
      }
      return (vertices>'x')*=radius;
    }

    //! Create and return a 3d ellipsoid.
    /**
       \param[out] primitives The returned list of the 3d object primitives
                              (template type \e tf should be at least \e unsigned \e int).
       \param tensor The tensor which gives the shape and size of the ellipsoid.
       \param subdivisions The number of recursive subdivisions from an initial stretched icosahedron.
       \return The N vertices (xi,yi,zi) of the 3d object as a Nx3 CImg<float> image (0<=i<=N-1).
       \par Sample code :
       \code
       CImgList<unsigned int> faces3d;
       const CImg<float> tensor = CImg<float>::diagonal(10,7,3),
                         points3d = CImg<float>::ellipsoid3d(faces3d,tensor,4);
       CImg<unsigned char>().display_object3d("Ellipsoid3d",points3d,faces3d);
       \endcode
       \image html ref_ellipsoid3d.jpg
    **/
    template<typename tf, typename t>
    static CImg<floatT> ellipsoid3d(CImgList<tf>& primitives,
                                    const CImg<t>& tensor, const unsigned int subdivisions=3) {
      primitives.assign();
      if (!subdivisions) return CImg<floatT>();
      CImg<floatT> S, V;
      tensor.symmetric_eigen(S,V);
      const float orient =
        (V(0,1)*V(1,2) - V(0,2)*V(1,1))*V(2,0) +
        (V(0,2)*V(1,0) - V(0,0)*V(1,2))*V(2,1) +
        (V(0,0)*V(1,1) - V(0,1)*V(1,0))*V(2,2);
      if (orient<0) { V(2,0) = -V(2,0); V(2,1) = -V(2,1); V(2,2) = -V(2,2); }
      const float l0 = S[0], l1 = S[1], l2 = S[2];
      CImg<floatT> vertices = sphere3d(primitives,1.0,subdivisions);
      vertices.get_shared_line(0)*=l0;
      vertices.get_shared_line(1)*=l1;
      vertices.get_shared_line(2)*=l2;
      return V*vertices;
    }

    //! Convert a 3d object into a CImg3d.
    template<typename tp, typename tc, typename to>
    CImg<T>& object3dtoCImg3d(const CImgList<tp>& primitives,
                              const CImgList<tc>& colors,
                              const to& opacities) {
      return get_object3dtoCImg3d(primitives,colors,opacities).move_to(*this);
    }

    template<typename tp, typename tc>
    CImg<T>& object3dtoCImg3d(const CImgList<tp>& primitives,
                              const CImgList<tc>& colors) {
      return get_object3dtoCImg3d(primitives,colors).move_to(*this);
    }

    template<typename tp>
    CImg<T>& object3dtoCImg3d(const CImgList<tp>& primitives) {
      return get_object3dtoCImg3d(primitives).move_to(*this);
    }

    CImg<T>& object3dtoCImg3d() {
      return get_object3dtoCImg3d().move_to(*this);
    }

    template<typename tp, typename tc, typename to>
    CImg<floatT> get_object3dtoCImg3d(const CImgList<tp>& primitives,
                                      const CImgList<tc>& colors,
                                      const to& opacities) const {
      char error_message[1024] = { 0 };
      if (!is_object3d(primitives,colors,opacities,true,error_message))
        throw CImgInstanceException(_cimg_instance
                                    "object3dtoCImg3d() : Invalid specified 3d object (%u,%u) (%s).",
                                    cimg_instance,_width,primitives._width,error_message);
      CImg<floatT> res(1,_size_object3dtoCImg3d(primitives,colors,opacities));
      float *ptrd = res._data;

      // Put magick number.
      *(ptrd++) = 'C' + 0.5f; *(ptrd++) = 'I' + 0.5f; *(ptrd++) = 'm' + 0.5f;
      *(ptrd++) = 'g' + 0.5f; *(ptrd++) = '3' + 0.5f; *(ptrd++) = 'd' + 0.5f;

      // Put number of vertices and primitives.
      *(ptrd++) = cimg::uint2float(_width);
      *(ptrd++) = cimg::uint2float(primitives._width);

      // Put vertex data.
      if (is_empty() || !primitives) return res;
      const T *ptrx = data(0,0), *ptry = data(0,1), *ptrz = data(0,2);
      cimg_forX(*this,p) {
        *(ptrd++) = (float)*(ptrx++);
        *(ptrd++) = (float)*(ptry++);
        *(ptrd++) = (float)*(ptrz++);
      }

      // Put primitive data.
      cimglist_for(primitives,p) {
        *(ptrd++) = (float)primitives[p].size();
        const tp *ptrp = primitives[p]._data;
        cimg_foroff(primitives[p],i) *(ptrd++) = cimg::uint2float((unsigned int)*(ptrp++));
      }

      // Put color/texture data.
      const unsigned int csiz = cimg::min(colors._width,primitives._width);
      for (int c = 0; c<(int)csiz; ++c) {
        const CImg<tc>& color = colors[c];
        const tc *ptrc = color._data;
        if (color.size()==3) { *(ptrd++) = (float)*(ptrc++); *(ptrd++) = (float)*(ptrc++); *(ptrd++) = (float)*ptrc; }
        else {
          *(ptrd++) = -128.0f;
          int shared_ind = -1;
          if (color.is_shared()) for (int i = 0; i<c; ++i) if (ptrc==colors[i]._data) { shared_ind = i; break; }
          if (shared_ind<0) {
            *(ptrd++) = (float)color._width;
            *(ptrd++) = (float)color._height;
            *(ptrd++) = (float)color._spectrum;
            cimg_foroff(color,l) *(ptrd++) = (float)*(ptrc++);
          } else {
            *(ptrd++) = (float)shared_ind;
            *(ptrd++) = 0;
            *(ptrd++) = 0;
          }
        }
      }
      const int csiz2 = primitives._width - colors._width;
      for (int c = 0; c<csiz2; ++c) { *(ptrd++) = 200.0f; *(ptrd++) = 200.0f; *(ptrd++) = 200.0f; }

      // Put opacity data.
      ptrd = _object3dtoCImg3d(opacities,ptrd);
      const float *ptre = res.end();
      while (ptrd<ptre) *(ptrd++) = 1.0f;
      return res;
    }

    template<typename to>
    float* _object3dtoCImg3d(const CImgList<to>& opacities, float *ptrd) const {
      cimglist_for(opacities,o) {
        const CImg<to>& opacity = opacities[o];
        const to *ptro = opacity._data;
        if (opacity.size()==1) *(ptrd++) = (float)*ptro;
        else {
          *(ptrd++) = -128.0f;
          int shared_ind = -1;
          if (opacity.is_shared()) for (int i = 0; i<o; ++i) if (ptro==opacities[i]._data) { shared_ind = i; break; }
          if (shared_ind<0) {
            *(ptrd++) = (float)opacity._width;
            *(ptrd++) = (float)opacity._height;
            *(ptrd++) = (float)opacity._spectrum;
            cimg_foroff(opacity,l) *(ptrd++) = (float)*(ptro++);
          } else {
            *(ptrd++) = (float)shared_ind;
            *(ptrd++) = 0;
            *(ptrd++) = 0;
          }
        }
      }
      return ptrd;
    }

    template<typename to>
    float* _object3dtoCImg3d(const CImg<to>& opacities, float *ptrd) const {
      const to *ptro = opacities._data;
      cimg_foroff(opacities,o) *(ptrd++) = (float)*(ptro++);
      return ptrd;
    }

    template<typename tp, typename tc, typename to>
    unsigned int _size_object3dtoCImg3d(const CImgList<tp>& primitives,
                                        const CImgList<tc>& colors,
                                        const CImgList<to>& opacities) const {
      unsigned int siz = 8 + 3*width();
      cimglist_for(primitives,p) siz+=primitives[p].size() + 1;
      for (int c = cimg::min(primitives._width,colors._width)-1; c>=0; --c) {
        if (colors[c].is_shared()) siz+=4;
        else { const unsigned int csiz = colors[c].size(); siz+=(csiz!=3)?4+csiz:3; }
      }
      if (colors._width<primitives._width) siz+=3*(primitives._width - colors._width);
      cimglist_for(opacities,o) {
        if (opacities[o].is_shared()) siz+=4;
        else { const unsigned int osiz = opacities[o].size(); siz+=(osiz!=1)?4+osiz:1; }
      }
      siz+=primitives._width - opacities._width;
      return siz;
    }

    template<typename tp, typename tc, typename to>
    unsigned int _size_object3dtoCImg3d(const CImgList<tp>& primitives,
                                        const CImgList<tc>& colors,
                                        const CImg<to>& opacities) const {
      unsigned int siz = 8 + 3*width();
      cimglist_for(primitives,p) siz+=primitives[p].size() + 1;
      for (int c = cimg::min(primitives._width,colors._width)-1; c>=0; --c) {
        const unsigned int csiz = colors[c].size(); siz+=(csiz!=3)?4+csiz:3;
      }
      if (colors._width<primitives._width) siz+=3*(primitives._width - colors._width);
      siz+=primitives.size();
      cimg::unused(opacities);
      return siz;
    }

    template<typename tp, typename tc>
    CImg<floatT> get_object3dtoCImg3d(const CImgList<tp>& primitives,
                                      const CImgList<tc>& colors) const {
      CImgList<T> opacities;
      return get_object3dtoCImg3d(primitives,colors,opacities);
    }

    template<typename tp>
    CImg<floatT> get_object3dtoCImg3d(const CImgList<tp>& primitives) const {
      CImgList<T> colors, opacities;
      return get_object3dtoCImg3d(primitives,colors,opacities);
    }

    CImg<floatT> get_object3dtoCImg3d() const {
      CImgList<T> opacities, colors;
      CImgList<uintT> primitives(width(),1,1,1,1);
      cimglist_for(primitives,p) primitives(p,0) = p;
      return get_object3dtoCImg3d(primitives,colors,opacities);
    }

    //! Convert a CImg3d (one-column image) into a 3d object.
    template<typename tp, typename tc, typename to>
    CImg<T> get_CImg3dtoobject3d(CImgList<tp>& primitives, CImgList<tc>& colors, CImgList<to>& opacities) const {
      char error_message[1024] = { 0 };
      if (!is_CImg3d(true,error_message))
        throw CImgInstanceException(_cimg_instance
                                    "CImg3dtoobject3d() : Instance image is not a CImg3d (%s).",
                                    cimg_instance,error_message);
      const T *ptrs = _data + 6;
      const unsigned int
        nb_points = cimg::float2uint((float)*(ptrs++)),
        nb_primitives = cimg::float2uint((float)*(ptrs++));
      const CImg<T> points = CImg<T>(ptrs,3,nb_points,1,1,true).get_transpose();
      ptrs+=3*nb_points;
      primitives.assign(nb_primitives);
      cimglist_for(primitives,p) {
        const unsigned int nb_inds = (unsigned int)*(ptrs++);
        primitives[p].assign(1,nb_inds);
        tp *ptrp = primitives[p]._data;
        for (unsigned int i = 0; i<nb_inds; ++i) *(ptrp++) = (tp)cimg::float2uint((float)*(ptrs++));
      }
      colors.assign(nb_primitives);
      cimglist_for(colors,c) {
        if ((int)*ptrs==-128) {
          ++ptrs;
          const unsigned int w = (unsigned int)*(ptrs++), h = (unsigned int)*(ptrs++), s = (unsigned int)*(ptrs++);
          if (!h && !s) colors[c].assign(colors[w],true);
          else { colors[c].assign(ptrs,w,h,1,s,false); ptrs+=w*h*s; }
        } else { colors[c].assign(ptrs,1,3,1,1,false); ptrs+=3; }
      }
      opacities.assign(nb_primitives);
      cimglist_for(opacities,o) {
        if ((int)*ptrs==-128) {
          ++ptrs;
          const unsigned int w = (unsigned int)*(ptrs++), h = (unsigned int)*(ptrs++), s = (unsigned int)*(ptrs++);
          if (!h && !s) opacities[o].assign(opacities[w],true);
          else { opacities[o].assign(ptrs,w,h,1,s,false); ptrs+=w*h*s; }
        } else opacities[o].assign(1,1,1,1,*(ptrs++));
      }
      return points;
    }

    template<typename tp, typename tc, typename to>
    CImg<T>& CImg3dtoobject3d(CImgList<tp>& primitives, CImgList<tc>& colors, CImgList<to>& opacities) {
      return get_CImg3dtoobject3d(primitives,colors,opacities).move_to(*this);
    }

    //@}
    //---------------------------
    //
    //! \name Drawing Functions
    //@{
    //---------------------------

    // The following _draw_scanline() routines are *non user-friendly functions*, used only for internal purpose.
    // Pre-requisites : x0<x1, y-coordinate is valid, col is valid.
    template<typename tc>
    CImg<T>& _draw_scanline(const int x0, const int x1, const int y,
                            const tc *const color, const float opacity=1,
                            const float brightness=1, const bool init=false) {
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      static float nopacity = 0, copacity = 0;
      static unsigned int whd = 0;
      static const tc *col = 0;
      if (init) {
        nopacity = cimg::abs(opacity);
        copacity = 1 - cimg::max(opacity,0);
        whd = _width*_height*_depth;
      } else {
        const int nx0 = x0>0?x0:0, nx1 = x1<width()?x1:width()-1, dx = nx1 - nx0;
        if (dx>=0) {
          col = color;
          const unsigned int off = whd-dx-1;
          T *ptrd = data(nx0,y);
          if (opacity>=1) { // ** Opaque drawing **
            if (brightness==1) { // Brightness==1
              if (sizeof(T)!=1) cimg_forC(*this,c) {
                const T val = (T)*(col++);
                for (int x = dx; x>=0; --x) *(ptrd++) = val;
                ptrd+=off;
              } else cimg_forC(*this,c) {
                const T val = (T)*(col++);
                std::memset(ptrd,(int)val,dx+1);
                ptrd+=whd;
              }
            } else if (brightness<1) { // Brightness<1
              if (sizeof(T)!=1) cimg_forC(*this,c) {
                const T val = (T)(*(col++)*brightness);
                for (int x = dx; x>=0; --x) *(ptrd++) = val;
                ptrd+=off;
              } else cimg_forC(*this,c) {
                const T val = (T)(*(col++)*brightness);
                std::memset(ptrd,(int)val,dx+1);
                ptrd+=whd;
              }
            } else { // Brightness>1
              if (sizeof(T)!=1) cimg_forC(*this,c) {
                const T val = (T)((2-brightness)**(col++) + (brightness-1)*maxval);
                for (int x = dx; x>=0; --x) *(ptrd++) = val;
                ptrd+=off;
              } else cimg_forC(*this,c) {
                const T val = (T)((2-brightness)**(col++) + (brightness-1)*maxval);
                std::memset(ptrd,(int)val,dx+1);
                ptrd+=whd;
              }
            }
          } else { // ** Transparent drawing **
            if (brightness==1) { // Brightness==1
              cimg_forC(*this,c) {
                const T val = (T)*(col++);
                for (int x = dx; x>=0; --x) { *ptrd = (T)(val*nopacity + *ptrd*copacity); ++ptrd; }
                ptrd+=off;
              }
            } else if (brightness<=1) { // Brightness<1
              cimg_forC(*this,c) {
                const T val = (T)(*(col++)*brightness);
                for (int x = dx; x>=0; --x) { *ptrd = (T)(val*nopacity + *ptrd*copacity); ++ptrd; }
                ptrd+=off;
              }
            } else { // Brightness>1
              cimg_forC(*this,c) {
                const T val = (T)((2-brightness)**(col++) + (brightness-1)*maxval);
                for (int x = dx; x>=0; --x) { *ptrd = (T)(val*nopacity + *ptrd*copacity); ++ptrd; }
                ptrd+=off;
              }
            }
          }
        }
      }
      return *this;
    }

    template<typename tc>
    CImg<T>& _draw_scanline(const tc *const color, const float opacity=1) {
      return _draw_scanline(0,0,0,color,opacity,0,true);
    }

    //! Draw a 2d colored point (pixel).
    /**
       \param x0 X-coordinate of the point.
       \param y0 Y-coordinate of the point.
       \param color Pointer to \c spectrum() consecutive values, defining the color values.
       \param opacity Drawing opacity (optional).
       \note
       - Clipping is supported.
       - To set pixel values without clipping needs, you should use the faster CImg::operator()() function.
       \par Example:
       \code
       CImg<unsigned char> img(100,100,1,3,0);
       const unsigned char color[] = { 255,128,64 };
       img.draw_point(50,50,color);
       \endcode
    **/
    template<typename tc>
    CImg<T>& draw_point(const int x0, const int y0,
                        const tc *const color, const float opacity=1) {
      return draw_point(x0,y0,0,color,opacity);
    }

    //! Draw a 3d colored point (voxel).
    template<typename tc>
    CImg<T>& draw_point(const int x0, const int y0, const int z0,
                        const tc *const color, const float opacity=1) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_point() : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      if (x0>=0 && y0>=0 && z0>=0 && x0<width() && y0<height() && z0<depth()) {
        const unsigned int whd = _width*_height*_depth;
        const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
        T *ptrd = data(x0,y0,z0,0);
        const tc *col = color;
        if (opacity>=1) cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=whd; }
        else cimg_forC(*this,c) { *ptrd = (T)(*(col++)*nopacity + *ptrd*copacity); ptrd+=whd; }
      }
      return *this;
    }

    // Draw a cloud of colored points.
    template<typename t, typename tc>
    CImg<T>& draw_point(const CImg<t>& points,
                        const tc *const color, const float opacity=1) {
      if (is_empty() || !points) return *this;
      switch (points._height) {
      case 0 : case 1 :
        throw CImgArgumentException(_cimg_instance
                                    "draw_point() : Invalid specified point set (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    points._width,points._height,points._depth,points._spectrum,points._data);
      case 2 : {
        cimg_forX(points,i) draw_point((int)points(i,0),(int)points(i,1),color,opacity);
      } break;
      default : {
        cimg_forX(points,i) draw_point((int)points(i,0),(int)points(i,1),(int)points(i,2),color,opacity);
      }
      }
      return *this;
    }

    //! Draw a 2d colored line.
    /**
       \param x0 X-coordinate of the starting line point.
       \param y0 Y-coordinate of the starting line point.
       \param x1 X-coordinate of the ending line point.
       \param y1 Y-coordinate of the ending line point.
       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
       \param opacity Drawing opacity (optional).
       \param pattern An integer whose bits describe the line pattern (optional).
       \param init_hatch Flag telling if a reinitialization of the hash state must be done (optional).
       \note
       - Clipping is supported.
       - Line routine uses Bresenham's algorithm.
       - Set \p init_hatch = false to draw consecutive hatched segments without breaking the line pattern.
       \par Example:
       \code
       CImg<unsigned char> img(100,100,1,3,0);
       const unsigned char color[] = { 255,128,64 };
        img.draw_line(40,40,80,70,color);
       \endcode
    **/
    template<typename tc>
    CImg<T>& draw_line(const int x0, const int y0,
                       const int x1, const int y1,
                       const tc *const color, const float opacity=1,
                       const unsigned int pattern=~0U, const bool init_hatch=true) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      static unsigned int hatch = ~0U - (~0U>>1);
      if (init_hatch) hatch = ~0U - (~0U>>1);
      const bool xdir = x0<x1, ydir = y0<y1;
      int
        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1,
        &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1,
        &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0;
      if (xright<0 || xleft>=width()) return *this;
      if (xleft<0) { yleft-=(int)((float)xleft*((float)yright - yleft)/((float)xright - xleft)); xleft = 0; }
      if (xright>=width()) { yright-=(int)(((float)xright - width())*((float)yright - yleft)/((float)xright - xleft)); xright = width() - 1; }
      if (ydown<0 || yup>=height()) return *this;
      if (yup<0) { xup-=(int)((float)yup*((float)xdown - xup)/((float)ydown - yup)); yup = 0; }
      if (ydown>=height()) { xdown-=(int)(((float)ydown - height())*((float)xdown - xup)/((float)ydown - yup)); ydown = height() - 1; }
      T *ptrd0 = data(nx0,ny0);
      int dx = xright - xleft, dy = ydown - yup;
      const bool steep = dy>dx;
      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
      const int
        offx = (nx0<nx1?1:-1)*(steep?_width:1),
        offy = (ny0<ny1?1:-1)*(steep?1:_width),
        wh = _width*_height;
      if (opacity>=1) {
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          if (pattern&hatch) {
            T *ptrd = ptrd0; const tc* col = color;
            cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=wh; }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          T *ptrd = ptrd0; const tc* col = color; cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=wh; }
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        }
      } else {
        const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          if (pattern&hatch) {
            T *ptrd = ptrd0; const tc* col = color;
            cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=wh; }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          T *ptrd = ptrd0; const tc* col = color; cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=wh; }
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        }
      }
      return *this;
    }

    //! Draw a 2d colored line, with z-buffering.
    template<typename tz,typename tc>
    CImg<T>& draw_line(CImg<tz>& zbuffer,
                       const int x0, const int y0, const float z0,
                       const int x1, const int y1, const float z1,
                       const tc *const color, const float opacity=1,
                       const unsigned int pattern=~0U, const bool init_hatch=true) {
      typedef typename cimg::superset<tz,float>::type tzfloat;
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Specified color is (null).",
                                    cimg_instance);
      if (!is_sameXY(zbuffer))
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Instance and specified Z-buffer (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);

      if (is_empty() || z0<=0 || z1<=0) return *this;
      static unsigned int hatch = ~0U - (~0U>>1);
      if (init_hatch) hatch = ~0U - (~0U>>1);
      const bool xdir = x0<x1, ydir = y0<y1;
      int
        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1,
        &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1,
        &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0;
      tzfloat
        Z0 = 1/(tzfloat)z0, Z1 = 1/(tzfloat)z1, nz0 = Z0, nz1 = Z1, dz = Z1 - Z0,
        &zleft = xdir?nz0:nz1,
        &zright = xdir?nz1:nz0,
        &zup = ydir?nz0:nz1,
        &zdown = ydir?nz1:nz0;
      if (xright<0 || xleft>=width()) return *this;
      if (xleft<0) {
        const float D = (float)xright - xleft;
        yleft-=(int)((float)xleft*((float)yright - yleft)/D);
        zleft-=(tzfloat)xleft*(zright - zleft)/D;
        xleft = 0;
      }
      if (xright>=width()) {
        const float d = (float)xright - width(), D = (float)xright - xleft;
        yright-=(int)(d*((float)yright - yleft)/D);
        zright-=(tzfloat)d*(zright - zleft)/D;
        xright = width() - 1;
      }
      if (ydown<0 || yup>=height()) return *this;
      if (yup<0) {
        const float D = (float)ydown - yup;
        xup-=(int)((float)yup*((float)xdown - xup)/D);
        zup-=(tzfloat)yup*(zdown - zup)/D;
        yup = 0;
      }
      if (ydown>=height()) {
        const float d = (float)ydown - height(), D = (float)ydown - yup;
        xdown-=(int)(d*((float)xdown - xup)/D);
        zdown-=(tzfloat)d*(zdown - zup)/D;
        ydown = height() - 1;
      }
      T *ptrd0 = data(nx0,ny0);
      tz *ptrz = zbuffer.data(nx0,ny0);
      int dx = xright - xleft, dy = ydown - yup;
      const bool steep = dy>dx;
      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
      const int
        offx = (nx0<nx1?1:-1)*(steep?_width:1),
        offy = (ny0<ny1?1:-1)*(steep?1:_width),
        wh = _width*_height,
        ndx = dx>0?dx:1;
      if (opacity>=1) {
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          const tzfloat z = Z0 + x*dz/ndx;
          if (z>=(tzfloat)*ptrz && pattern&hatch) {
            *ptrz = (tz)z;
            T *ptrd = ptrd0; const tc *col = color;
            cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=wh; }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx; ptrz+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          const tzfloat z = Z0 + x*dz/ndx;
          if (z>=(tzfloat)*ptrz) {
            *ptrz = (tz)z;
            T *ptrd = ptrd0; const tc *col = color;
            cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=wh; }
          }
          ptrd0+=offx; ptrz+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
        }
      } else {
        const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          const tzfloat z = Z0 + x*dz/ndx;
          if (z>=(tzfloat)*ptrz && pattern&hatch) {
            *ptrz = (tz)z;
            T *ptrd = ptrd0; const tc *col = color;
            cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=wh; }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx; ptrz+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          const tzfloat z = Z0 + x*dz/ndx;
          if (z>=(tzfloat)*ptrz) {
            *ptrz = (tz)z;
            T *ptrd = ptrd0; const tc *col = color;
            cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=wh; }
          }
          ptrd0+=offx; ptrz+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
        }
      }
      return *this;
    }

    //! Draw a 3d colored line.
    template<typename tc>
    CImg<T>& draw_line(const int x0, const int y0, const int z0,
                       const int x1, const int y1, const int z1,
                       const tc *const color, const float opacity=1,
                       const unsigned int pattern=~0U, const bool init_hatch=true) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      static unsigned int hatch = ~0U - (~0U>>1);
      if (init_hatch) hatch = ~0U - (~0U>>1);
      int nx0 = x0, ny0 = y0, nz0 = z0, nx1 = x1, ny1 = y1, nz1 = z1;
      if (nx0>nx1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1);
      if (nx1<0 || nx0>=width()) return *this;
      if (nx0<0) { const float D = 1.0f + nx1 - nx0; ny0-=(int)((float)nx0*(1.0f + ny1 - ny0)/D); nz0-=(int)((float)nx0*(1.0f + nz1 - nz0)/D); nx0 = 0; }
      if (nx1>=width()) { const float d = (float)nx1 - width(), D = 1.0f + nx1 - nx0; ny1+=(int)(d*(1.0f + ny0 - ny1)/D); nz1+=(int)(d*(1.0f + nz0 - nz1)/D); nx1 = width() - 1; }
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1);
      if (ny1<0 || ny0>=height()) return *this;
      if (ny0<0) { const float D = 1.0f + ny1 - ny0; nx0-=(int)((float)ny0*(1.0f + nx1 - nx0)/D); nz0-=(int)((float)ny0*(1.0f + nz1 - nz0)/D); ny0 = 0; }
      if (ny1>=height()) { const float d = (float)ny1 - height(), D = 1.0f + ny1 - ny0; nx1+=(int)(d*(1.0f + nx0 - nx1)/D); nz1+=(int)(d*(1.0f + nz0 - nz1)/D); ny1 = height() - 1; }
      if (nz0>nz1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1);
      if (nz1<0 || nz0>=depth()) return *this;
      if (nz0<0) { const float D = 1.0f + nz1 - nz0; nx0-=(int)((float)nz0*(1.0f + nx1 - nx0)/D); ny0-=(int)((float)nz0*(1.0f + ny1 - ny0)/D); nz0 = 0; }
      if (nz1>=depth()) { const float d = (float)nz1 - depth(), D = 1.0f + nz1 - nz0; nx1+=(int)(d*(1.0f + nx0 - nx1)/D); ny1+=(int)(d*(1.0f + ny0 - ny1)/D); nz1 = depth() - 1; }
      const unsigned int dmax = cimg::max(cimg::abs(nx1 - nx0),cimg::abs(ny1 - ny0),nz1 - nz0), whd = _width*_height*_depth;
      const float px = (nx1 - nx0)/(float)dmax, py = (ny1 - ny0)/(float)dmax, pz = (nz1 - nz0)/(float)dmax;
      float x = (float)nx0, y = (float)ny0, z = (float)nz0;
      if (opacity>=1) for (unsigned int t = 0; t<=dmax; ++t) {
        if (!(~pattern) || (~pattern && pattern&hatch)) {
          T* ptrd = data((unsigned int)x,(unsigned int)y,(unsigned int)z);
          const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=whd; }
        }
        x+=px; y+=py; z+=pz; if (pattern) { hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1); }
      } else {
        const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
        for (unsigned int t = 0; t<=dmax; ++t) {
          if (!(~pattern) || (~pattern && pattern&hatch)) {
            T* ptrd = data((unsigned int)x,(unsigned int)y,(unsigned int)z);
            const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)(*(col++)*nopacity + *ptrd*copacity); ptrd+=whd; }
          }
          x+=px; y+=py; z+=pz; if (pattern) { hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1); }
        }
      }
      return *this;
    }

    //! Draw a 2d textured line.
    /**
       \param x0 X-coordinate of the starting line point.
       \param y0 Y-coordinate of the starting line point.
       \param x1 X-coordinate of the ending line point.
       \param y1 Y-coordinate of the ending line point.
       \param texture Texture image defining the pixel colors.
       \param tx0 X-coordinate of the starting texture point.
       \param ty0 Y-coordinate of the starting texture point.
       \param tx1 X-coordinate of the ending texture point.
       \param ty1 Y-coordinate of the ending texture point.
       \param opacity Drawing opacity (optional).
       \param pattern An integer whose bits describe the line pattern (optional).
       \param init_hatch Flag telling if the hash variable must be reinitialized (optional).
       \note
       - Clipping is supported but not for texture coordinates.
       - Line routine uses the well known Bresenham's algorithm.
       \par Example:
       \code
       CImg<unsigned char> img(100,100,1,3,0), texture("texture256x256.ppm");
       const unsigned char color[] = { 255,128,64 };
       img.draw_line(40,40,80,70,texture,0,0,255,255);
       \endcode
    **/
    template<typename tc>
    CImg<T>& draw_line(const int x0, const int y0,
                       const int x1, const int y1,
                       const CImg<tc>& texture,
                       const int tx0, const int ty0,
                       const int tx1, const int ty1,
                       const float opacity=1,
                       const unsigned int pattern=~0U, const bool init_hatch=true) {
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);

      if (is_empty()) return *this;
      if (is_overlapped(texture)) return draw_line(x0,y0,x1,y1,+texture,tx0,ty0,tx1,ty1,opacity,pattern,init_hatch);
      static unsigned int hatch = ~0U - (~0U>>1);
      if (init_hatch) hatch = ~0U - (~0U>>1);
      const bool xdir = x0<x1, ydir = y0<y1;
      int
        dtx = tx1-tx0, dty = ty1-ty0,
        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
        tnx0 = tx0, tnx1 = tx1, tny0 = ty0, tny1 = ty1,
        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1, &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
        &txleft = xdir?tnx0:tnx1, &tyleft = xdir?tny0:tny1, &txright = xdir?tnx1:tnx0, &tyright = xdir?tny1:tny0,
        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1, &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0,
        &txup = ydir?tnx0:tnx1, &tyup = ydir?tny0:tny1, &txdown = ydir?tnx1:tnx0, &tydown = ydir?tny1:tny0;
      if (xright<0 || xleft>=width()) return *this;
      if (xleft<0) {
        const float D = (float)xright - xleft;
        yleft-=(int)((float)xleft*((float)yright - yleft)/D);
        txleft-=(int)((float)xleft*((float)txright - txleft)/D);
        tyleft-=(int)((float)xleft*((float)tyright - tyleft)/D);
        xleft = 0;
      }
      if (xright>=width()) {
        const float d = (float)xright - width(), D = (float)xright - xleft;
        yright-=(int)(d*((float)yright - yleft)/D);
        txright-=(int)(d*((float)txright - txleft)/D);
        tyright-=(int)(d*((float)tyright - tyleft)/D);
        xright = width() - 1;
      }
      if (ydown<0 || yup>=height()) return *this;
      if (yup<0) {
        const float D = (float)ydown - yup;
        xup-=(int)((float)yup*((float)xdown - xup)/D);
        txup-=(int)((float)yup*((float)txdown - txup)/D);
        tyup-=(int)((float)yup*((float)tydown - tyup)/D);
        yup = 0;
      }
      if (ydown>=height()) {
        const float d = (float)ydown - height(), D = (float)ydown - yup;
        xdown-=(int)(d*((float)xdown - xup)/D);
        txdown-=(int)(d*((float)txdown - txup)/D);
        tydown-=(int)(d*((float)tydown - tyup)/D);
        ydown = height() - 1;
      }
      T *ptrd0 = data(nx0,ny0);
      int dx = xright - xleft, dy = ydown - yup;
      const bool steep = dy>dx;
      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
      const int
        offx = (nx0<nx1?1:-1)*(steep?_width:1),
        offy = (ny0<ny1?1:-1)*(steep?1:_width),
        wh = _width*_height,
        ndx = dx>0?dx:1;
      if (opacity>=1) {
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          if (pattern&hatch) {
            T *ptrd = ptrd0;
            const int tx = tx0 + x*dtx/ndx, ty = ty0 + x*dty/ndx;
            cimg_forC(*this,c) { *ptrd = (T)texture(tx,ty,0,c); ptrd+=wh; }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          T *ptrd = ptrd0;
          const int tx = tx0 + x*dtx/ndx, ty = ty0 + x*dty/ndx;
          cimg_forC(*this,c) { *ptrd = (T)texture(tx,ty,0,c); ptrd+=wh; }
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        }
      } else {
        const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          T *ptrd = ptrd0;
          if (pattern&hatch) {
            const int tx = tx0 + x*dtx/ndx, ty = ty0 + x*dty/ndx;
            cimg_forC(*this,c) { *ptrd = (T)(nopacity*texture(tx,ty,0,c) + *ptrd*copacity); ptrd+=wh; }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          T *ptrd = ptrd0;
          const int tx = tx0 + x*dtx/ndx, ty = ty0 + x*dty/ndx;
          cimg_forC(*this,c) { *ptrd = (T)(nopacity*texture(tx,ty,0,c) + *ptrd*copacity); ptrd+=wh; }
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        }
      }
      return *this;
    }

    //! Draw a 2d textured line, with perspective correction.
    template<typename tc>
    CImg<T>& draw_line(const int x0, const int y0, const float z0,
                       const int x1, const int y1, const float z1,
                       const CImg<tc>& texture,
                       const int tx0, const int ty0,
                       const int tx1, const int ty1,
                       const float opacity=1,
                       const unsigned int pattern=~0U, const bool init_hatch=true) {
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);

      if (is_empty() && z0<=0 && z1<=0) return *this;
      if (is_overlapped(texture)) return draw_line(x0,y0,z0,x1,y1,z1,+texture,tx0,ty0,tx1,ty1,opacity,pattern,init_hatch);
      static unsigned int hatch = ~0U - (~0U>>1);
      if (init_hatch) hatch = ~0U - (~0U>>1);
      const bool xdir = x0<x1, ydir = y0<y1;
      int
        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1,
        &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1,
        &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0;
      float
        Tx0 = tx0/z0, Tx1 = tx1/z1,
        Ty0 = ty0/z0, Ty1 = ty1/z1,
        Z0 = 1/z0, Z1 = 1/z1,
        dz = Z1 - Z0, dtx = Tx1 - Tx0, dty = Ty1 - Ty0,
        tnx0 = Tx0, tnx1 = Tx1, tny0 = Ty0, tny1 = Ty1, nz0 = Z0, nz1 = Z1,
        &zleft = xdir?nz0:nz1, &txleft = xdir?tnx0:tnx1, &tyleft = xdir?tny0:tny1,
        &zright = xdir?nz1:nz0, &txright = xdir?tnx1:tnx0, &tyright = xdir?tny1:tny0,
        &zup = ydir?nz0:nz1, &txup = ydir?tnx0:tnx1, &tyup = ydir?tny0:tny1,
        &zdown = ydir?nz1:nz0, &txdown = ydir?tnx1:tnx0, &tydown = ydir?tny1:tny0;
      if (xright<0 || xleft>=width()) return *this;
      if (xleft<0) {
        const float D = (float)xright - xleft;
        yleft-=(int)((float)xleft*((float)yright - yleft)/D);
        zleft-=(float)xleft*(zright - zleft)/D;
        txleft-=(float)xleft*(txright - txleft)/D;
        tyleft-=(float)xleft*(tyright - tyleft)/D;
        xleft = 0;
      }
      if (xright>=width()) {
        const float d = (float)xright - width(), D = (float)xright - xleft;
        yright-=(int)(d*((float)yright - yleft)/D);
        zright-=d*(zright - zleft)/D;
        txright-=d*(txright - txleft)/D;
        tyright-=d*(tyright - tyleft)/D;
        xright = width() - 1;
      }
      if (ydown<0 || yup>=height()) return *this;
      if (yup<0) {
        const float D = (float)ydown - yup;
        xup-=(int)((float)yup*((float)xdown - xup)/D);
        zup-=(float)yup*(zdown - zup)/D;
        txup-=(float)yup*(txdown - txup)/D;
        tyup-=(float)yup*(tydown - tyup)/D;
        yup = 0;
      }
      if (ydown>=height()) {
        const float d = (float)ydown - height(), D = (float)ydown - yup;
        xdown-=(int)(d*((float)xdown - xup)/D);
        zdown-=d*(zdown - zup)/D;
        txdown-=d*(txdown - txup)/D;
        tydown-=d*(tydown - tyup)/D;
        ydown = height() - 1;
      }
      T *ptrd0 = data(nx0,ny0);
      int dx = xright - xleft, dy = ydown - yup;
      const bool steep = dy>dx;
      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
      const int
        offx = (nx0<nx1?1:-1)*(steep?_width:1),
        offy = (ny0<ny1?1:-1)*(steep?1:_width),
        wh = _width*_height,
        ndx = dx>0?dx:1;
      if (opacity>=1) {
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          if (pattern&hatch) {
            const float z = Z0 + x*dz/ndx, tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
            T *ptrd = ptrd0; cimg_forC(*this,c) { *ptrd = (T)texture((int)(tx/z),(int)(ty/z),0,c); ptrd+=wh; }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          const float z = Z0 + x*dz/ndx, tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
          T *ptrd = ptrd0; cimg_forC(*this,c) { *ptrd = (T)texture((int)(tx/z),(int)(ty/z),0,c); ptrd+=wh; }
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        }
      } else {
        const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          if (pattern&hatch) {
            const float z = Z0 + x*dz/ndx, tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
            T *ptrd = ptrd0; cimg_forC(*this,c) { *ptrd = (T)(nopacity*texture((int)(tx/z),(int)(ty/z),0,c) + *ptrd*copacity); ptrd+=wh; }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          const float z = Z0 + x*dz/ndx, tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
          T *ptrd = ptrd0;
          cimg_forC(*this,c) { *ptrd = (T)(nopacity*texture((int)(tx/z),(int)(ty/z),0,c) + *ptrd*copacity); ptrd+=wh; }
          ptrd0+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; error+=dx; }
        }
      }
      return *this;
    }

    //! Draw a 2d textured line, with z-buffering and perspective correction.
    template<typename tz, typename tc>
    CImg<T>& draw_line(CImg<tz>& zbuffer,
                       const int x0, const int y0, const float z0,
                       const int x1, const int y1, const float z1,
                       const CImg<tc>& texture,
                       const int tx0, const int ty0,
                       const int tx1, const int ty1,
                       const float opacity=1,
                       const unsigned int pattern=~0U, const bool init_hatch=true) {
      typedef typename cimg::superset<tz,float>::type tzfloat;
      if (!is_sameXY(zbuffer))
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Instance and specified Z-buffer (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);

      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);

      if (is_empty() || z0<=0 || z1<=0) return *this;
      if (is_overlapped(texture)) return draw_line(zbuffer,x0,y0,z0,x1,y1,z1,+texture,tx0,ty0,tx1,ty1,opacity,pattern,init_hatch);
      static unsigned int hatch = ~0U - (~0U>>1);
      if (init_hatch) hatch = ~0U - (~0U>>1);
      const bool xdir = x0<x1, ydir = y0<y1;
      int
        nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1,
        &xleft = xdir?nx0:nx1, &yleft = xdir?ny0:ny1,
        &xright = xdir?nx1:nx0, &yright = xdir?ny1:ny0,
        &xup = ydir?nx0:nx1, &yup = ydir?ny0:ny1,
        &xdown = ydir?nx1:nx0, &ydown = ydir?ny1:ny0;
      float
        Tx0 = tx0/z0, Tx1 = tx1/z1,
        Ty0 = ty0/z0, Ty1 = ty1/z1,
        dtx = Tx1 - Tx0, dty = Ty1 - Ty0,
        tnx0 = Tx0, tnx1 = Tx1, tny0 = Ty0, tny1 = Ty1,
        &txleft = xdir?tnx0:tnx1, &tyleft = xdir?tny0:tny1,
        &txright = xdir?tnx1:tnx0, &tyright = xdir?tny1:tny0,
        &txup = ydir?tnx0:tnx1, &tyup = ydir?tny0:tny1,
        &txdown = ydir?tnx1:tnx0, &tydown = ydir?tny1:tny0;
      tzfloat
        Z0 = 1/(tzfloat)z0, Z1 = 1/(tzfloat)z1,
        dz = Z1 - Z0,  nz0 = Z0, nz1 = Z1,
        &zleft = xdir?nz0:nz1,
        &zright = xdir?nz1:nz0,
        &zup = ydir?nz0:nz1,
        &zdown = ydir?nz1:nz0;
      if (xright<0 || xleft>=width()) return *this;
      if (xleft<0) {
        const float D = (float)xright - xleft;
        yleft-=(int)((float)xleft*((float)yright - yleft)/D);
        zleft-=(float)xleft*(zright - zleft)/D;
        txleft-=(float)xleft*(txright - txleft)/D;
        tyleft-=(float)xleft*(tyright - tyleft)/D;
        xleft = 0;
      }
      if (xright>=width()) {
        const float d = (float)xright - width(), D = (float)xright - xleft;
        yright-=(int)(d*((float)yright - yleft)/D);
        zright-=d*(zright - zleft)/D;
        txright-=d*(txright - txleft)/D;
        tyright-=d*(tyright - tyleft)/D;
        xright = width()-1;
      }
      if (ydown<0 || yup>=height()) return *this;
      if (yup<0) {
        const float D = (float)ydown - yup;
        xup-=(int)((float)yup*((float)xdown - xup)/D);
        zup-=yup*(zdown - zup)/D;
        txup-=yup*(txdown - txup)/D;
        tyup-=yup*(tydown - tyup)/D;
        yup = 0;
      }
      if (ydown>=height()) {
        const float d = (float)ydown - height(), D = (float)ydown - yup;
        xdown-=(int)(d*((float)xdown - xup)/D);
        zdown-=d*(zdown - zup)/D;
        txdown-=d*(txdown - txup)/D;
        tydown-=d*(tydown - tyup)/D;
        ydown = height()-1;
      }
      T *ptrd0 = data(nx0,ny0);
      tz *ptrz = zbuffer.data(nx0,ny0);
      int dx = xright - xleft, dy = ydown - yup;
      const bool steep = dy>dx;
      if (steep) cimg::swap(nx0,ny0,nx1,ny1,dx,dy);
      const int
        offx = (nx0<nx1?1:-1)*(steep?_width:1),
        offy = (ny0<ny1?1:-1)*(steep?1:_width),
        wh = _width*_height,
        ndx = dx>0?dx:1;
      if (opacity>=1) {
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          if (pattern&hatch) {
            const tzfloat z = Z0 + x*dz/ndx;
            if (z>=(tzfloat)*ptrz) {
              *ptrz = (tz)z;
              const float tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
              T *ptrd = ptrd0; cimg_forC(*this,c) { *ptrd = (T)texture((int)(tx/z),(int)(ty/z),0,c); ptrd+=wh; }
            }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx; ptrz+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          const tzfloat z = Z0 + x*dz/ndx;
          if (z>=(tzfloat)*ptrz) {
            *ptrz = (tz)z;
            const float tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
            T *ptrd = ptrd0; cimg_forC(*this,c) { *ptrd = (T)texture((int)(tx/z),(int)(ty/z),0,c); ptrd+=wh; }
          }
          ptrd0+=offx; ptrz+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
        }
      } else {
        const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
        if (~pattern) for (int error = dx>>1, x = 0; x<=dx; ++x) {
          if (pattern&hatch) {
            const tzfloat z = Z0 + x*dz/ndx;
            if (z>=(tzfloat)*ptrz) {
              *ptrz = (tz)z;
              const float tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
              T *ptrd = ptrd0; cimg_forC(*this,c) { *ptrd = (T)(nopacity*texture((int)(tx/z),(int)(ty/z),0,c) + *ptrd*copacity); ptrd+=wh; }
            }
          }
          hatch>>=1; if (!hatch) hatch = ~0U - (~0U>>1);
          ptrd0+=offx; ptrz+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offy; error+=dx; }
        } else for (int error = dx>>1, x = 0; x<=dx; ++x) {
          const tzfloat z = Z0 + x*dz/ndx;
          if (z>=(tzfloat)*ptrz) {
            *ptrz = (tz)z;
            const float tx = Tx0 + x*dtx/ndx, ty = Ty0 + x*dty/ndx;
            T *ptrd = ptrd0; cimg_forC(*this,c) { *ptrd = (T)(nopacity*texture((int)(tx/z),(int)(ty/z),0,c) + *ptrd*copacity); ptrd+=wh; }
          }
          ptrd0+=offx; ptrz+=offx;
          if ((error-=dy)<0) { ptrd0+=offy; ptrz+=offx; error+=dx; }
        }
      }
      return *this;
    }

    //! Draw a set of consecutive colored lines in the instance image.
    /**
       \param points Coordinates of vertices, stored as a list of vectors.
       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
       \param opacity Drawing opacity (optional).
       \param pattern An integer whose bits describe the line pattern (optional).
       \param init_hatch If set to true, init hatch motif.
       \note
       - This function uses several call to the single CImg::draw_line() procedure,
       depending on the vectors size in \p points.
       \par Example:
       \code
       CImg<unsigned char> img(100,100,1,3,0);
       const unsigned char color[] = { 255,128,64 };
       CImgList<int> points;
       points.insert(CImg<int>::vector(0,0)).
             .insert(CImg<int>::vector(70,10)).
             .insert(CImg<int>::vector(80,60)).
             .insert(CImg<int>::vector(10,90));
       img.draw_line(points,color);
       \endcode
    **/
    template<typename t, typename tc>
    CImg<T>& draw_line(const CImg<t>& points,
                       const tc *const color, const float opacity=1,
                       const unsigned int pattern=~0U, const bool init_hatch=true) {
      if (is_empty() || !points || points._width<2) return *this;
      bool ninit_hatch = init_hatch;
      switch (points._height) {
      case 0 : case 1 :
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Invalid specified point set (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    points._width,points._height,points._depth,points._spectrum,points._data);

      case 2 : {
        const int x0 = (int)points(0,0), y0 = (int)points(0,1);
        int ox = x0, oy = y0;
        for (unsigned int i = 1; i<points._width; ++i) {
          const int x = (int)points(i,0), y = (int)points(i,1);
          draw_line(ox,oy,x,y,color,opacity,pattern,ninit_hatch);
          ninit_hatch = false;
          ox = x; oy = y;
        }
      } break;
      default : {
        const int x0 = (int)points(0,0), y0 = (int)points(0,1), z0 = (int)points(0,2);
        int ox = x0, oy = y0, oz = z0;
        for (unsigned int i = 1; i<points._width; ++i) {
          const int x = (int)points(i,0), y = (int)points(i,1), z = (int)points(i,2);
          draw_line(ox,oy,oz,x,y,z,color,opacity,pattern,ninit_hatch);
          ninit_hatch = false;
          ox = x; oy = y; oz = z;
        }
      }
      }
      return *this;
    }

    //! Draw a colored arrow in the instance image.
    /**
       \param x0 X-coordinate of the starting arrow point (tail).
       \param y0 Y-coordinate of the starting arrow point (tail).
       \param x1 X-coordinate of the ending arrow point (head).
       \param y1 Y-coordinate of the ending arrow point (head).
       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
       \param angle Aperture angle of the arrow head (optional).
       \param length Length of the arrow head. If negative, describes a percentage of the arrow length (optional).
       \param opacity Drawing opacity (optional).
       \param pattern An integer whose bits describe the line pattern (optional).
       \note
       - Clipping is supported.
    **/
    template<typename tc>
    CImg<T>& draw_arrow(const int x0, const int y0,
                        const int x1, const int y1,
                        const tc *const color, const float opacity=1,
                        const float angle=30, const float length=-10,
                        const unsigned int pattern=~0U) {
      if (is_empty()) return *this;
      const float u = (float)(x0 - x1), v = (float)(y0 - y1), sq = u*u + v*v,
        deg = (float)(angle*cimg::PI/180), ang = (sq>0)?(float)std::atan2(v,u):0.0f,
        l = (length>=0)?length:-length*(float)std::sqrt(sq)/100;
      if (sq>0) {
        const float
            cl = (float)std::cos(ang - deg), sl = (float)std::sin(ang - deg),
            cr = (float)std::cos(ang + deg), sr = (float)std::sin(ang + deg);
        const int
          xl = x1 + (int)(l*cl), yl = y1 + (int)(l*sl),
          xr = x1 + (int)(l*cr), yr = y1 + (int)(l*sr),
          xc = x1 + (int)((l+1)*(cl+cr))/2, yc = y1 + (int)((l+1)*(sl+sr))/2;
        draw_line(x0,y0,xc,yc,color,opacity,pattern).draw_triangle(x1,y1,xl,yl,xr,yr,color,opacity);
      } else draw_point(x0,y0,color,opacity);
      return *this;
    }

    //! Draw a cubic spline curve in the instance image.
    /**
       \param x0 X-coordinate of the starting curve point
       \param y0 Y-coordinate of the starting curve point
       \param u0 X-coordinate of the starting velocity
       \param v0 Y-coordinate of the starting velocity
       \param x1 X-coordinate of the ending curve point
       \param y1 Y-coordinate of the ending curve point
       \param u1 X-coordinate of the ending velocity
       \param v1 Y-coordinate of the ending velocity
       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
       \param precision Curve drawing precision (optional).
       \param opacity Drawing opacity (optional).
       \param pattern An integer whose bits describe the line pattern (optional).
       \param init_hatch If \c true, init hatch motif.
       \note
       - The curve is a 2d cubic Bezier spline, from the set of specified starting/ending points
       and corresponding velocity vectors.
       - The spline is drawn as a serie of connected segments. The \p precision parameter sets the
       average number of pixels in each drawn segment.
       - A cubic Bezier curve is sometimes defined by a set of 4 points { (\p x0,\p y0), (\p xa,\p ya), (\p xb,\p yb), (\p x1,\p y1) }
       where (\p x0,\p y0) is the starting point, (\p x1,\p y1) is the ending point and (\p xa,\p ya), (\p xb,\p yb) are two
       \e control points.
       The starting and ending velocities (\p u0,\p v0) and (\p u1,\p v1) can be deduced easily from the control points as
       \p u0 = (\p xa - \p x0), \p v0 = (\p ya - \p y0), \p u1 = (\p x1 - \p xb) and \p v1 = (\p y1 - \p yb).
       \par Example:
       \code
       CImg<unsigned char> img(100,100,1,3,0);
       const unsigned char color[] = { 255,255,255 };
       img.draw_spline(30,30,0,100,90,40,0,-100,color);
       \endcode
    **/
    template<typename tc>
    CImg<T>& draw_spline(const int x0, const int y0, const float u0, const float v0,
                         const int x1, const int y1, const float u1, const float v1,
                         const tc *const color, const float opacity=1,
                         const float precision=0.25, const unsigned int pattern=~0U,
                         const bool init_hatch=true) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_spline() : Specified color is (null).",
                                    cimg_instance);
      if (is_empty()) return *this;
      if (x0==x1 && y0==y1) return draw_point(x0,y0,color,opacity);
      bool ninit_hatch = init_hatch;
      const float
        ax = u0 + u1 + 2*(x0 - x1),
        bx = 3*(x1 - x0) - 2*u0 - u1,
        ay = v0 + v1 + 2*(y0 - y1),
        by = 3*(y1 - y0) - 2*v0 - v1,
        _precision = 1/(std::sqrt(cimg::sqr((float)x0-x1)+cimg::sqr((float)y0-y1))*(precision>0?precision:1));
      int ox = x0, oy = y0;
      for (float t = 0; t<1; t+=_precision) {
        const float t2 = t*t, t3 = t2*t;
        const int
          nx = (int)(ax*t3 + bx*t2 + u0*t + x0),
          ny = (int)(ay*t3 + by*t2 + v0*t + y0);
        draw_line(ox,oy,nx,ny,color,opacity,pattern,ninit_hatch);
        ninit_hatch = false;
        ox = nx; oy = ny;
      }
      return draw_line(ox,oy,x1,y1,color,opacity,pattern,false);
    }

    //! Draw a cubic spline curve in the instance image (for volumetric images).
    /**
       \note
       - Similar to CImg::draw_spline() for a 3d spline in a volumetric image.
    **/
    template<typename tc>
    CImg<T>& draw_spline(const int x0, const int y0, const int z0, const float u0, const float v0, const float w0,
                         const int x1, const int y1, const int z1, const float u1, const float v1, const float w1,
                         const tc *const color, const float opacity=1,
                         const float precision=4, const unsigned int pattern=~0U,
                         const bool init_hatch=true) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_spline() : Specified color is (null).",
                                    cimg_instance);
      if (is_empty()) return *this;
      if (x0==x1 && y0==y1 && z0==z1) return draw_point(x0,y0,z0,color,opacity);
      bool ninit_hatch = init_hatch;
      const float
        ax = u0 + u1 + 2*(x0 - x1),
        bx = 3*(x1 - x0) - 2*u0 - u1,
        ay = v0 + v1 + 2*(y0 - y1),
        by = 3*(y1 - y0) - 2*v0 - v1,
        az = w0 + w1 + 2*(z0 - z1),
        bz = 3*(z1 - z0) - 2*w0 - w1,
        _precision = 1/(std::sqrt(cimg::sqr(x0-x1)+cimg::sqr(y0-y1))*(precision>0?precision:1));
      int ox = x0, oy = y0, oz = z0;
      for (float t = 0; t<1; t+=_precision) {
        const float t2 = t*t, t3 = t2*t;
        const int
          nx = (int)(ax*t3 + bx*t2 + u0*t + x0),
          ny = (int)(ay*t3 + by*t2 + v0*t + y0),
          nz = (int)(az*t3 + bz*t2 + w0*t + z0);
        draw_line(ox,oy,oz,nx,ny,nz,color,opacity,pattern,ninit_hatch);
        ninit_hatch = false;
        ox = nx; oy = ny; oz = nz;
      }
      return draw_line(ox,oy,oz,x1,y1,z1,color,opacity,pattern,false);
    }

    //! Draw a cubic spline curve in the instance image.
    /**
       \param x0 X-coordinate of the starting curve point
       \param y0 Y-coordinate of the starting curve point
       \param u0 X-coordinate of the starting velocity
       \param v0 Y-coordinate of the starting velocity
       \param x1 X-coordinate of the ending curve point
       \param y1 Y-coordinate of the ending curve point
       \param u1 X-coordinate of the ending velocity
       \param v1 Y-coordinate of the ending velocity
       \param texture Texture image defining line pixel colors.
       \param tx0 X-coordinate of the starting texture point.
       \param ty0 Y-coordinate of the starting texture point.
       \param tx1 X-coordinate of the ending texture point.
       \param ty1 Y-coordinate of the ending texture point.
       \param precision Curve drawing precision (optional).
       \param opacity Drawing opacity (optional).
       \param pattern An integer whose bits describe the line pattern (optional).
       \param init_hatch if \c true, reinit hatch motif.
    **/
    template<typename t>
    CImg<T>& draw_spline(const int x0, const int y0, const float u0, const float v0,
                         const int x1, const int y1, const float u1, const float v1,
                         const CImg<t>& texture,
                         const int tx0, const int ty0, const int tx1, const int ty1,
                         const float opacity=1,
                         const float precision=4, const unsigned int pattern=~0U,
                         const bool init_hatch=true) {
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
      if (is_empty()) return *this;
      if (is_overlapped(texture)) return draw_spline(x0,y0,u0,v0,x1,y1,u1,v1,+texture,tx0,ty0,tx1,ty1,precision,opacity,pattern,init_hatch);
      if (x0==x1 && y0==y1) return draw_point(x0,y0,texture.get_vector_at(x0,y0),opacity);
      bool ninit_hatch = init_hatch;
      const float
        ax = u0 + u1 + 2*(x0 - x1),
        bx = 3*(x1 - x0) - 2*u0 - u1,
        ay = v0 + v1 + 2*(y0 - y1),
        by = 3*(y1 - y0) - 2*v0 - v1,
        _precision = 1/(std::sqrt(cimg::sqr(x0-x1)+cimg::sqr(y0-y1))*(precision>0?precision:1));
      int ox = x0, oy = y0, otx = tx0, oty = ty0;
      for (float t = 0; t<1; t+=_precision) {
        const float t2 = t*t, t3 = t2*t;
        const int
          nx = (int)(ax*t3 + bx*t2 + u0*t + x0),
          ny = (int)(ay*t3 + by*t2 + v0*t + y0),
          ntx = tx0 + (int)((tx1-tx0)*t),
          nty = ty0 + (int)((ty1-ty0)*t);
        draw_line(ox,oy,nx,ny,texture,otx,oty,ntx,nty,opacity,pattern,ninit_hatch);
        ninit_hatch = false;
        ox = nx; oy = ny; otx = ntx; oty = nty;
      }
      return draw_line(ox,oy,x1,y1,texture,otx,oty,tx1,ty1,opacity,pattern,false);
    }

    // Draw a set of connected spline curves in the instance image (internal).
    template<typename tp, typename tt, typename tc>
    CImg<T>& draw_spline(const CImg<tp>& points, const CImg<tt>& tangents,
                         const tc *const color, const float opacity=1,
                         const bool close_set=false, const float precision=4,
                         const unsigned int pattern=~0U, const bool init_hatch=true) {
      if (is_empty() || !points || !tangents || points._width<2 || tangents._width<2) return *this;
      bool ninit_hatch = init_hatch;
      switch (points._height) {
      case 0 : case 1 :
        throw CImgArgumentException(_cimg_instance
                                    "draw_spline() : Invalid specified point set (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    points._width,points._height,points._depth,points._spectrum,points._data);

      case 2 : {
        const int x0 = (int)points(0,0), y0 = (int)points(0,1);
        const float u0 = (float)tangents(0,0), v0 = (float)tangents(0,1);
        int ox = x0, oy = y0;
        float ou = u0, ov = v0;
        for (unsigned int i = 1; i<points._width; ++i) {
          const int x = (int)points(i,0), y = (int)points(i,1);
          const float u = (float)tangents(i,0), v = (float)tangents(i,1);
          draw_spline(ox,oy,ou,ov,x,y,u,v,color,precision,opacity,pattern,ninit_hatch);
          ninit_hatch = false;
          ox = x; oy = y; ou = u; ov = v;
        }
        if (close_set) draw_spline(ox,oy,ou,ov,x0,y0,u0,v0,color,precision,opacity,pattern,false);
      } break;
      default : {
        const int x0 = (int)points(0,0), y0 = (int)points(0,1), z0 = (int)points(0,2);
        const float u0 = (float)tangents(0,0), v0 = (float)tangents(0,1), w0 = (float)tangents(0,2);
        int ox = x0, oy = y0, oz = z0;
        float ou = u0, ov = v0, ow = w0;
        for (unsigned int i = 1; i<points._width; ++i) {
          const int x = (int)points(i,0), y = (int)points(i,1), z = (int)points(i,2);
          const float u = (float)tangents(i,0), v = (float)tangents(i,1), w = (float)tangents(i,2);
          draw_spline(ox,oy,oz,ou,ov,ow,x,y,z,u,v,w,color,opacity,pattern,ninit_hatch);
          ninit_hatch = false;
          ox = x; oy = y; oz = z; ou = u; ov = v; ow = w;
        }
        if (close_set) draw_spline(ox,oy,oz,ou,ov,ow,x0,y0,z0,u0,v0,w0,color,precision,opacity,pattern,false);
      }
      }
      return *this;
    }

    //! Draw a set of consecutive colored splines in the instance image.
    template<typename tp, typename tc>
    CImg<T>& draw_spline(const CImg<tp>& points,
                         const tc *const color, const float opacity=1,
                         const bool close_set=false, const float precision=4,
                         const unsigned int pattern=~0U, const bool init_hatch=true) {
      if (is_empty() || !points || points._width<2) return *this;
      CImg<Tfloat> tangents;
      switch (points._height) {
      case 0 : case 1 :
        throw CImgArgumentException(_cimg_instance
                                    "draw_spline() : Invalid specified point set (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    points._width,points._height,points._depth,points._spectrum,points._data);
      case 2 : {
        tangents.assign(points._width,points._height);
        cimg_forX(points,p) {
          const unsigned int
            p0 = close_set?(p+points._width-1)%points._width:(p?p-1:0),
            p1 = close_set?(p+1)%points._width:(p+1<points._width?p+1:p);
          const float
            x = (float)points(p,0),
            y = (float)points(p,1),
            x0 = (float)points(p0,0),
            y0 = (float)points(p0,1),
            x1 = (float)points(p1,0),
            y1 = (float)points(p1,1),
            u0 = x - x0,
            v0 = y - y0,
            n0 = 1e-8f + (float)std::sqrt(u0*u0 + v0*v0),
            u1 = x1 - x,
            v1 = y1 - y,
            n1 = 1e-8f + (float)std::sqrt(u1*u1 + v1*v1),
            u = u0/n0 + u1/n1,
            v = v0/n0 + v1/n1,
            n = 1e-8f + (float)std::sqrt(u*u + v*v),
            fact = 0.5f*(n0 + n1);
          tangents(p,0) = (Tfloat)(fact*u/n);
          tangents(p,1) = (Tfloat)(fact*v/n);
        }
      } break;
      default : {
        tangents.assign(points._width,points._height);
        cimg_forX(points,p) {
          const unsigned int
            p0 = close_set?(p+points._width-1)%points._width:(p?p-1:0),
            p1 = close_set?(p+1)%points._width:(p+1<points._width?p+1:p);
          const float
            x = (float)points(p,0),
            y = (float)points(p,1),
            z = (float)points(p,2),
            x0 = (float)points(p0,0),
            y0 = (float)points(p0,1),
            z0 = (float)points(p0,2),
            x1 = (float)points(p1,0),
            y1 = (float)points(p1,1),
            z1 = (float)points(p1,2),
            u0 = x - x0,
            v0 = y - y0,
            w0 = z - z0,
            n0 = 1e-8f + (float)std::sqrt(u0*u0 + v0*v0 + w0*w0),
            u1 = x1 - x,
            v1 = y1 - y,
            w1 = z1 - z,
            n1 = 1e-8f + (float)std::sqrt(u1*u1 + v1*v1 + w1*w1),
            u = u0/n0 + u1/n1,
            v = v0/n0 + v1/n1,
            w = w0/n0 + w1/n1,
            n = 1e-8f + (float)std::sqrt(u*u + v*v + w*w),
            fact = 0.5f*(n0 + n1);
          tangents(p,0) = (Tfloat)(fact*u/n);
          tangents(p,1) = (Tfloat)(fact*v/n);
          tangents(p,2) = (Tfloat)(fact*w/n);
        }
      }
      }
      return draw_spline(points,tangents,color,opacity,close_set,precision,pattern,init_hatch);
    }

    // Inner macro for drawing triangles.
#define _cimg_for_triangle1(img,xl,xr,y,x0,y0,x1,y1,x2,y2) \
        for (int y = y0<0?0:y0, \
               xr = y0>=0?x0:(x0-y0*(x2-x0)/(y2-y0)), \
               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0-y0*(x1-x0)/(y1-y0))):(x1-y1*(x2-x1)/(y2-y1)), \
               _sxn=1, \
               _sxr=1, \
               _sxl=1, \
               _dxn = x2>x1?x2-x1:(_sxn=-1,x1-x2), \
               _dxr = x2>x0?x2-x0:(_sxr=-1,x0-x2), \
               _dxl = x1>x0?x1-x0:(_sxl=-1,x0-x1), \
               _dyn = y2-y1, \
               _dyr = y2-y0, \
               _dyl = y1-y0, \
               _counter = (_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
                           _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
                           _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
                           cimg::min((int)(img)._height-y-1,y2-y)), \
               _errn = _dyn/2, \
               _errr = _dyr/2, \
               _errl = _dyl/2, \
               _rxn = _dyn?(x2-x1)/_dyn:0, \
               _rxr = _dyr?(x2-x0)/_dyr:0, \
               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1-x0)/_dyl:0): \
                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn); \
             _counter>=0; --_counter, ++y, \
               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
               xl+=(y!=y1)?_rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0): \
                           (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1-xl))

#define _cimg_for_triangle2(img,xl,cl,xr,cr,y,x0,y0,c0,x1,y1,c1,x2,y2,c2) \
        for (int y = y0<0?0:y0, \
               xr = y0>=0?x0:(x0-y0*(x2-x0)/(y2-y0)), \
               cr = y0>=0?c0:(c0-y0*(c2-c0)/(y2-y0)), \
               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0-y0*(x1-x0)/(y1-y0))):(x1-y1*(x2-x1)/(y2-y1)), \
               cl = y1>=0?(y0>=0?(y0==y1?c1:c0):(c0-y0*(c1-c0)/(y1-y0))):(c1-y1*(c2-c1)/(y2-y1)), \
               _sxn=1, _scn=1, \
               _sxr=1, _scr=1, \
               _sxl=1, _scl=1, \
               _dxn = x2>x1?x2-x1:(_sxn=-1,x1-x2), \
               _dxr = x2>x0?x2-x0:(_sxr=-1,x0-x2), \
               _dxl = x1>x0?x1-x0:(_sxl=-1,x0-x1), \
               _dcn = c2>c1?c2-c1:(_scn=-1,c1-c2), \
               _dcr = c2>c0?c2-c0:(_scr=-1,c0-c2), \
               _dcl = c1>c0?c1-c0:(_scl=-1,c0-c1), \
               _dyn = y2-y1, \
               _dyr = y2-y0, \
               _dyl = y1-y0, \
               _counter =(_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
                          _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
                          _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
                          _dcn-=_dyn?_dyn*(_dcn/_dyn):0, \
                          _dcr-=_dyr?_dyr*(_dcr/_dyr):0, \
                          _dcl-=_dyl?_dyl*(_dcl/_dyl):0, \
                          cimg::min((int)(img)._height-y-1,y2-y)), \
               _errn = _dyn/2, _errcn = _errn, \
               _errr = _dyr/2, _errcr = _errr, \
               _errl = _dyl/2, _errcl = _errl, \
               _rxn = _dyn?(x2-x1)/_dyn:0, \
               _rcn = _dyn?(c2-c1)/_dyn:0, \
               _rxr = _dyr?(x2-x0)/_dyr:0, \
               _rcr = _dyr?(c2-c0)/_dyr:0, \
               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1-x0)/_dyl:0): \
                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn), \
               _rcl = (y0!=y1 && y1>0)?(_dyl?(c1-c0)/_dyl:0): \
                                       (_errcl=_errcn, _dcl=_dcn, _dyl=_dyn, _scl=_scn, _rcn ); \
             _counter>=0; --_counter, ++y, \
               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
               cr+=_rcr+((_errcr-=_dcr)<0?_errcr+=_dyr,_scr:0), \
               xl+=(y!=y1)?(cl+=_rcl+((_errcl-=_dcl)<0?(_errcl+=_dyl,_scl):0), \
                           _rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0)): \
               (_errcl=_errcn, _dcl=_dcn, _dyl=_dyn, _scl=_scn, _rcl=_rcn, cl=c1, \
                _errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1-xl))

#define _cimg_for_triangle3(img,xl,txl,tyl,xr,txr,tyr,y,x0,y0,tx0,ty0,x1,y1,tx1,ty1,x2,y2,tx2,ty2) \
        for (int y = y0<0?0:y0, \
               xr = y0>=0?x0:(x0-y0*(x2-x0)/(y2-y0)), \
               txr = y0>=0?tx0:(tx0-y0*(tx2-tx0)/(y2-y0)), \
               tyr = y0>=0?ty0:(ty0-y0*(ty2-ty0)/(y2-y0)), \
               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0-y0*(x1-x0)/(y1-y0))):(x1-y1*(x2-x1)/(y2-y1)), \
               txl = y1>=0?(y0>=0?(y0==y1?tx1:tx0):(tx0-y0*(tx1-tx0)/(y1-y0))):(tx1-y1*(tx2-tx1)/(y2-y1)), \
               tyl = y1>=0?(y0>=0?(y0==y1?ty1:ty0):(ty0-y0*(ty1-ty0)/(y1-y0))):(ty1-y1*(ty2-ty1)/(y2-y1)), \
               _sxn=1, _stxn=1, _styn=1, \
               _sxr=1, _stxr=1, _styr=1, \
               _sxl=1, _stxl=1, _styl=1, \
               _dxn = x2>x1?x2-x1:(_sxn=-1,x1-x2), \
               _dxr = x2>x0?x2-x0:(_sxr=-1,x0-x2), \
               _dxl = x1>x0?x1-x0:(_sxl=-1,x0-x1), \
               _dtxn = tx2>tx1?tx2-tx1:(_stxn=-1,tx1-tx2), \
               _dtxr = tx2>tx0?tx2-tx0:(_stxr=-1,tx0-tx2), \
               _dtxl = tx1>tx0?tx1-tx0:(_stxl=-1,tx0-tx1), \
               _dtyn = ty2>ty1?ty2-ty1:(_styn=-1,ty1-ty2), \
               _dtyr = ty2>ty0?ty2-ty0:(_styr=-1,ty0-ty2), \
               _dtyl = ty1>ty0?ty1-ty0:(_styl=-1,ty0-ty1), \
               _dyn = y2-y1, \
               _dyr = y2-y0, \
               _dyl = y1-y0, \
               _counter =(_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
                          _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
                          _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
                          _dtxn-=_dyn?_dyn*(_dtxn/_dyn):0, \
                          _dtxr-=_dyr?_dyr*(_dtxr/_dyr):0, \
                          _dtxl-=_dyl?_dyl*(_dtxl/_dyl):0, \
                          _dtyn-=_dyn?_dyn*(_dtyn/_dyn):0, \
                          _dtyr-=_dyr?_dyr*(_dtyr/_dyr):0, \
                          _dtyl-=_dyl?_dyl*(_dtyl/_dyl):0, \
                          cimg::min((int)(img)._height-y-1,y2-y)), \
               _errn = _dyn/2, _errtxn = _errn, _errtyn = _errn, \
               _errr = _dyr/2, _errtxr = _errr, _errtyr = _errr, \
               _errl = _dyl/2, _errtxl = _errl, _errtyl = _errl, \
               _rxn = _dyn?(x2-x1)/_dyn:0, \
               _rtxn = _dyn?(tx2-tx1)/_dyn:0, \
               _rtyn = _dyn?(ty2-ty1)/_dyn:0, \
               _rxr = _dyr?(x2-x0)/_dyr:0, \
               _rtxr = _dyr?(tx2-tx0)/_dyr:0, \
               _rtyr = _dyr?(ty2-ty0)/_dyr:0, \
               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1-x0)/_dyl:0): \
                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn), \
               _rtxl = (y0!=y1 && y1>0)?(_dyl?(tx1-tx0)/_dyl:0): \
                                       (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxn ), \
               _rtyl = (y0!=y1 && y1>0)?(_dyl?(ty1-ty0)/_dyl:0): \
                                       (_errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyn ); \
             _counter>=0; --_counter, ++y, \
               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
               txr+=_rtxr+((_errtxr-=_dtxr)<0?_errtxr+=_dyr,_stxr:0), \
               tyr+=_rtyr+((_errtyr-=_dtyr)<0?_errtyr+=_dyr,_styr:0), \
               xl+=(y!=y1)?(txl+=_rtxl+((_errtxl-=_dtxl)<0?(_errtxl+=_dyl,_stxl):0), \
                            tyl+=_rtyl+((_errtyl-=_dtyl)<0?(_errtyl+=_dyl,_styl):0), \
                           _rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0)): \
               (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxl=_rtxn, txl=tx1, \
                _errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyl=_rtyn, tyl=ty1,\
                _errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1-xl))

#define _cimg_for_triangle4(img,xl,cl,txl,tyl,xr,cr,txr,tyr,y,x0,y0,c0,tx0,ty0,x1,y1,c1,tx1,ty1,x2,y2,c2,tx2,ty2) \
        for (int y = y0<0?0:y0, \
               xr = y0>=0?x0:(x0-y0*(x2-x0)/(y2-y0)), \
               cr = y0>=0?c0:(c0-y0*(c2-c0)/(y2-y0)), \
               txr = y0>=0?tx0:(tx0-y0*(tx2-tx0)/(y2-y0)), \
               tyr = y0>=0?ty0:(ty0-y0*(ty2-ty0)/(y2-y0)), \
               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0-y0*(x1-x0)/(y1-y0))):(x1-y1*(x2-x1)/(y2-y1)), \
               cl = y1>=0?(y0>=0?(y0==y1?c1:c0):(c0-y0*(c1-c0)/(y1-y0))):(c1-y1*(c2-c1)/(y2-y1)), \
               txl = y1>=0?(y0>=0?(y0==y1?tx1:tx0):(tx0-y0*(tx1-tx0)/(y1-y0))):(tx1-y1*(tx2-tx1)/(y2-y1)), \
               tyl = y1>=0?(y0>=0?(y0==y1?ty1:ty0):(ty0-y0*(ty1-ty0)/(y1-y0))):(ty1-y1*(ty2-ty1)/(y2-y1)), \
               _sxn=1, _scn=1, _stxn=1, _styn=1, \
               _sxr=1, _scr=1, _stxr=1, _styr=1, \
               _sxl=1, _scl=1, _stxl=1, _styl=1, \
               _dxn = x2>x1?x2-x1:(_sxn=-1,x1-x2), \
               _dxr = x2>x0?x2-x0:(_sxr=-1,x0-x2), \
               _dxl = x1>x0?x1-x0:(_sxl=-1,x0-x1), \
               _dcn = c2>c1?c2-c1:(_scn=-1,c1-c2), \
               _dcr = c2>c0?c2-c0:(_scr=-1,c0-c2), \
               _dcl = c1>c0?c1-c0:(_scl=-1,c0-c1), \
               _dtxn = tx2>tx1?tx2-tx1:(_stxn=-1,tx1-tx2), \
               _dtxr = tx2>tx0?tx2-tx0:(_stxr=-1,tx0-tx2), \
               _dtxl = tx1>tx0?tx1-tx0:(_stxl=-1,tx0-tx1), \
               _dtyn = ty2>ty1?ty2-ty1:(_styn=-1,ty1-ty2), \
               _dtyr = ty2>ty0?ty2-ty0:(_styr=-1,ty0-ty2), \
               _dtyl = ty1>ty0?ty1-ty0:(_styl=-1,ty0-ty1), \
               _dyn = y2-y1, \
               _dyr = y2-y0, \
               _dyl = y1-y0, \
               _counter =(_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
                          _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
                          _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
                          _dcn-=_dyn?_dyn*(_dcn/_dyn):0, \
                          _dcr-=_dyr?_dyr*(_dcr/_dyr):0, \
                          _dcl-=_dyl?_dyl*(_dcl/_dyl):0, \
                          _dtxn-=_dyn?_dyn*(_dtxn/_dyn):0, \
                          _dtxr-=_dyr?_dyr*(_dtxr/_dyr):0, \
                          _dtxl-=_dyl?_dyl*(_dtxl/_dyl):0, \
                          _dtyn-=_dyn?_dyn*(_dtyn/_dyn):0, \
                          _dtyr-=_dyr?_dyr*(_dtyr/_dyr):0, \
                          _dtyl-=_dyl?_dyl*(_dtyl/_dyl):0, \
                          cimg::min((int)(img)._height-y-1,y2-y)), \
               _errn = _dyn/2, _errcn = _errn, _errtxn = _errn, _errtyn = _errn, \
               _errr = _dyr/2, _errcr = _errr, _errtxr = _errr, _errtyr = _errr, \
               _errl = _dyl/2, _errcl = _errl, _errtxl = _errl, _errtyl = _errl, \
               _rxn = _dyn?(x2-x1)/_dyn:0, \
               _rcn = _dyn?(c2-c1)/_dyn:0, \
               _rtxn = _dyn?(tx2-tx1)/_dyn:0, \
               _rtyn = _dyn?(ty2-ty1)/_dyn:0, \
               _rxr = _dyr?(x2-x0)/_dyr:0, \
               _rcr = _dyr?(c2-c0)/_dyr:0, \
               _rtxr = _dyr?(tx2-tx0)/_dyr:0, \
               _rtyr = _dyr?(ty2-ty0)/_dyr:0, \
               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1-x0)/_dyl:0): \
                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn), \
               _rcl = (y0!=y1 && y1>0)?(_dyl?(c1-c0)/_dyl:0): \
                                       (_errcl=_errcn, _dcl=_dcn, _dyl=_dyn, _scl=_scn, _rcn ), \
               _rtxl = (y0!=y1 && y1>0)?(_dyl?(tx1-tx0)/_dyl:0): \
                                        (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxn ), \
               _rtyl = (y0!=y1 && y1>0)?(_dyl?(ty1-ty0)/_dyl:0): \
                                        (_errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyn ); \
             _counter>=0; --_counter, ++y, \
               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
               cr+=_rcr+((_errcr-=_dcr)<0?_errcr+=_dyr,_scr:0), \
               txr+=_rtxr+((_errtxr-=_dtxr)<0?_errtxr+=_dyr,_stxr:0), \
               tyr+=_rtyr+((_errtyr-=_dtyr)<0?_errtyr+=_dyr,_styr:0), \
               xl+=(y!=y1)?(cl+=_rcl+((_errcl-=_dcl)<0?(_errcl+=_dyl,_scl):0), \
                            txl+=_rtxl+((_errtxl-=_dtxl)<0?(_errtxl+=_dyl,_stxl):0), \
                            tyl+=_rtyl+((_errtyl-=_dtyl)<0?(_errtyl+=_dyl,_styl):0), \
                            _rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0)): \
               (_errcl=_errcn, _dcl=_dcn, _dyl=_dyn, _scl=_scn, _rcl=_rcn, cl=c1, \
                _errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxl=_rtxn, txl=tx1, \
                _errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyl=_rtyn, tyl=ty1, \
                _errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1-xl))

#define _cimg_for_triangle5(img,xl,txl,tyl,lxl,lyl,xr,txr,tyr,lxr,lyr,y,x0,y0,tx0,ty0,lx0,ly0,x1,y1,tx1,ty1,lx1,ly1,x2,y2,tx2,ty2,lx2,ly2) \
        for (int y = y0<0?0:y0, \
               xr = y0>=0?x0:(x0-y0*(x2-x0)/(y2-y0)), \
               txr = y0>=0?tx0:(tx0-y0*(tx2-tx0)/(y2-y0)), \
               tyr = y0>=0?ty0:(ty0-y0*(ty2-ty0)/(y2-y0)), \
               lxr = y0>=0?lx0:(lx0-y0*(lx2-lx0)/(y2-y0)), \
               lyr = y0>=0?ly0:(ly0-y0*(ly2-ly0)/(y2-y0)), \
               xl = y1>=0?(y0>=0?(y0==y1?x1:x0):(x0-y0*(x1-x0)/(y1-y0))):(x1-y1*(x2-x1)/(y2-y1)), \
               txl = y1>=0?(y0>=0?(y0==y1?tx1:tx0):(tx0-y0*(tx1-tx0)/(y1-y0))):(tx1-y1*(tx2-tx1)/(y2-y1)), \
               tyl = y1>=0?(y0>=0?(y0==y1?ty1:ty0):(ty0-y0*(ty1-ty0)/(y1-y0))):(ty1-y1*(ty2-ty1)/(y2-y1)), \
               lxl = y1>=0?(y0>=0?(y0==y1?lx1:lx0):(lx0-y0*(lx1-lx0)/(y1-y0))):(lx1-y1*(lx2-lx1)/(y2-y1)), \
               lyl = y1>=0?(y0>=0?(y0==y1?ly1:ly0):(ly0-y0*(ly1-ly0)/(y1-y0))):(ly1-y1*(ly2-ly1)/(y2-y1)), \
               _sxn=1, _stxn=1, _styn=1, _slxn=1, _slyn=1, \
               _sxr=1, _stxr=1, _styr=1, _slxr=1, _slyr=1, \
               _sxl=1, _stxl=1, _styl=1, _slxl=1, _slyl=1, \
               _dxn = x2>x1?x2-x1:(_sxn=-1,x1-x2), _dyn = y2-y1, \
               _dxr = x2>x0?x2-x0:(_sxr=-1,x0-x2), _dyr = y2-y0, \
               _dxl = x1>x0?x1-x0:(_sxl=-1,x0-x1), _dyl = y1-y0, \
               _dtxn = tx2>tx1?tx2-tx1:(_stxn=-1,tx1-tx2), \
               _dtxr = tx2>tx0?tx2-tx0:(_stxr=-1,tx0-tx2), \
               _dtxl = tx1>tx0?tx1-tx0:(_stxl=-1,tx0-tx1), \
               _dtyn = ty2>ty1?ty2-ty1:(_styn=-1,ty1-ty2), \
               _dtyr = ty2>ty0?ty2-ty0:(_styr=-1,ty0-ty2), \
               _dtyl = ty1>ty0?ty1-ty0:(_styl=-1,ty0-ty1), \
               _dlxn = lx2>lx1?lx2-lx1:(_slxn=-1,lx1-lx2), \
               _dlxr = lx2>lx0?lx2-lx0:(_slxr=-1,lx0-lx2), \
               _dlxl = lx1>lx0?lx1-lx0:(_slxl=-1,lx0-lx1), \
               _dlyn = ly2>ly1?ly2-ly1:(_slyn=-1,ly1-ly2), \
               _dlyr = ly2>ly0?ly2-ly0:(_slyr=-1,ly0-ly2), \
               _dlyl = ly1>ly0?ly1-ly0:(_slyl=-1,ly0-ly1), \
               _counter =(_dxn-=_dyn?_dyn*(_dxn/_dyn):0, \
                          _dxr-=_dyr?_dyr*(_dxr/_dyr):0, \
                          _dxl-=_dyl?_dyl*(_dxl/_dyl):0, \
                          _dtxn-=_dyn?_dyn*(_dtxn/_dyn):0, \
                          _dtxr-=_dyr?_dyr*(_dtxr/_dyr):0, \
                          _dtxl-=_dyl?_dyl*(_dtxl/_dyl):0, \
                          _dtyn-=_dyn?_dyn*(_dtyn/_dyn):0, \
                          _dtyr-=_dyr?_dyr*(_dtyr/_dyr):0, \
                          _dtyl-=_dyl?_dyl*(_dtyl/_dyl):0, \
                          _dlxn-=_dyn?_dyn*(_dlxn/_dyn):0, \
                          _dlxr-=_dyr?_dyr*(_dlxr/_dyr):0, \
                          _dlxl-=_dyl?_dyl*(_dlxl/_dyl):0, \
                          _dlyn-=_dyn?_dyn*(_dlyn/_dyn):0, \
                          _dlyr-=_dyr?_dyr*(_dlyr/_dyr):0, \
                          _dlyl-=_dyl?_dyl*(_dlyl/_dyl):0, \
                          cimg::min((int)(img)._height-y-1,y2-y)), \
               _errn = _dyn/2, _errtxn = _errn, _errtyn = _errn, _errlxn = _errn, _errlyn = _errn, \
               _errr = _dyr/2, _errtxr = _errr, _errtyr = _errr, _errlxr = _errr, _errlyr = _errr, \
               _errl = _dyl/2, _errtxl = _errl, _errtyl = _errl, _errlxl = _errl, _errlyl = _errl, \
               _rxn = _dyn?(x2-x1)/_dyn:0, \
               _rtxn = _dyn?(tx2-tx1)/_dyn:0, \
               _rtyn = _dyn?(ty2-ty1)/_dyn:0, \
               _rlxn = _dyn?(lx2-lx1)/_dyn:0, \
               _rlyn = _dyn?(ly2-ly1)/_dyn:0, \
               _rxr = _dyr?(x2-x0)/_dyr:0, \
               _rtxr = _dyr?(tx2-tx0)/_dyr:0, \
               _rtyr = _dyr?(ty2-ty0)/_dyr:0, \
               _rlxr = _dyr?(lx2-lx0)/_dyr:0, \
               _rlyr = _dyr?(ly2-ly0)/_dyr:0, \
               _rxl = (y0!=y1 && y1>0)?(_dyl?(x1-x0)/_dyl:0): \
                                       (_errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxn), \
               _rtxl = (y0!=y1 && y1>0)?(_dyl?(tx1-tx0)/_dyl:0): \
                                        (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxn ), \
               _rtyl = (y0!=y1 && y1>0)?(_dyl?(ty1-ty0)/_dyl:0): \
                                        (_errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyn ), \
               _rlxl = (y0!=y1 && y1>0)?(_dyl?(lx1-lx0)/_dyl:0): \
                                        (_errlxl=_errlxn, _dlxl=_dlxn, _dyl=_dyn, _slxl=_slxn, _rlxn ), \
               _rlyl = (y0!=y1 && y1>0)?(_dyl?(ly1-ly0)/_dyl:0): \
                                        (_errlyl=_errlyn, _dlyl=_dlyn, _dyl=_dyn, _slyl=_slyn, _rlyn ); \
             _counter>=0; --_counter, ++y, \
               xr+=_rxr+((_errr-=_dxr)<0?_errr+=_dyr,_sxr:0), \
               txr+=_rtxr+((_errtxr-=_dtxr)<0?_errtxr+=_dyr,_stxr:0), \
               tyr+=_rtyr+((_errtyr-=_dtyr)<0?_errtyr+=_dyr,_styr:0), \
               lxr+=_rlxr+((_errlxr-=_dlxr)<0?_errlxr+=_dyr,_slxr:0), \
               lyr+=_rlyr+((_errlyr-=_dlyr)<0?_errlyr+=_dyr,_slyr:0), \
               xl+=(y!=y1)?(txl+=_rtxl+((_errtxl-=_dtxl)<0?(_errtxl+=_dyl,_stxl):0), \
                            tyl+=_rtyl+((_errtyl-=_dtyl)<0?(_errtyl+=_dyl,_styl):0), \
                            lxl+=_rlxl+((_errlxl-=_dlxl)<0?(_errlxl+=_dyl,_slxl):0), \
                            lyl+=_rlyl+((_errlyl-=_dlyl)<0?(_errlyl+=_dyl,_slyl):0), \
                            _rxl+((_errl-=_dxl)<0?(_errl+=_dyl,_sxl):0)): \
               (_errtxl=_errtxn, _dtxl=_dtxn, _dyl=_dyn, _stxl=_stxn, _rtxl=_rtxn, txl=tx1, \
                _errtyl=_errtyn, _dtyl=_dtyn, _dyl=_dyn, _styl=_styn, _rtyl=_rtyn, tyl=ty1, \
                _errlxl=_errlxn, _dlxl=_dlxn, _dyl=_dyn, _slxl=_slxn, _rlxl=_rlxn, lxl=lx1, \
                _errlyl=_errlyn, _dlyl=_dlyn, _dyl=_dyn, _slyl=_slyn, _rlyl=_rlyn, lyl=ly1, \
                _errl=_errn, _dxl=_dxn, _dyl=_dyn, _sxl=_sxn, _rxl=_rxn, x1-xl))

    // Draw a colored triangle (inner routine, uses bresenham's algorithm).
    template<typename tc>
    CImg<T>& _draw_triangle(const int x0, const int y0,
                            const int x1, const int y1,
                            const int x2, const int y2,
                            const tc *const color, const float opacity,
                            const float brightness) {
      _draw_scanline(color,opacity);
      const float nbrightness = brightness<0?0:(brightness>2?2:brightness);
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2);
      if (ny0<height() && ny2>=0) {
        if ((nx1 - nx0)*(ny2 - ny0) - (nx2 - nx0)*(ny1 - ny0)<0)
          _cimg_for_triangle1(*this,xl,xr,y,nx0,ny0,nx1,ny1,nx2,ny2) _draw_scanline(xl,xr,y,color,opacity,nbrightness);
        else
          _cimg_for_triangle1(*this,xl,xr,y,nx0,ny0,nx1,ny1,nx2,ny2) _draw_scanline(xr,xl,y,color,opacity,nbrightness);
      }
      return *this;
    }

    //! Draw a 2d filled colored triangle.
    template<typename tc>
    CImg<T>& draw_triangle(const int x0, const int y0,
                           const int x1, const int y1,
                           const int x2, const int y2,
                           const tc *const color, const float opacity=1) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      _draw_triangle(x0,y0,x1,y1,x2,y2,color,opacity,1);
      return *this;
    }

    //! Draw a 2d outlined colored triangle.
    template<typename tc>
    CImg<T>& draw_triangle(const int x0, const int y0,
                           const int x1, const int y1,
                           const int x2, const int y2,
                           const tc *const color, const float opacity,
                           const unsigned int pattern) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      draw_line(x0,y0,x1,y1,color,opacity,pattern,true).
        draw_line(x1,y1,x2,y2,color,opacity,pattern,false).
        draw_line(x2,y2,x0,y0,color,opacity,pattern,false);
      return *this;
    }

    //! Draw a 2d filled colored triangle, with z-buffering.
    template<typename tz, typename tc>
    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
                           const int x0, const int y0, const float z0,
                           const int x1, const int y1, const float z1,
                           const int x2, const int y2, const float z2,
                           const tc *const color, const float opacity=1,
                           const float brightness=1) {
      typedef typename cimg::superset<tz,float>::type tzfloat;
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Specified color is (null).",
                                    cimg_instance);
      if (!is_sameXY(zbuffer))
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Instance and specified Z-buffer (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);

      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float
        nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0),
        nbrightness = brightness<0?0:(brightness>2?2:brightness);
      const int whd = _width*_height*_depth, offx = _spectrum*whd;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2;
      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nz0,nz2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nz1,nz2);
      if (ny0>=height() || ny2<0) return *this;
      tzfloat
        pzl = (nz1 - nz0)/(ny1 - ny0),
        pzr = (nz2 - nz0)/(ny2 - ny0),
        pzn = (nz2 - nz1)/(ny2 - ny1),
        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
      _cimg_for_triangle1(*this,xleft0,xright0,y,nx0,ny0,nx1,ny1,nx2,ny2) {
        if (y==ny1) { zl = nz1; pzl = pzn; }
        int xleft = xleft0, xright = xright0;
        tzfloat zleft = zl, zright = zr;
        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright);
        const int dx = xright - xleft;
        const tzfloat pentez = (zright - zleft)/dx;
        if (xleft<0 && dx) zleft-=xleft*(zright - zleft)/dx;
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width() - 1;
        T* ptrd = data(xleft,y,0,0);
        tz *ptrz = zbuffer.data(xleft,y);
        if (opacity>=1) {
          if (nbrightness==1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
              const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=whd; }
              ptrd-=offx;
            }
            zleft+=pentez;
          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
              const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)(nbrightness*(*col++)); ptrd+=whd; }
              ptrd-=offx;
            }
            zleft+=pentez;
          } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
              const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)((2-nbrightness)**(col++) + (nbrightness-1)*maxval); ptrd+=whd; }
              ptrd-=offx;
            }
            zleft+=pentez;
          }
        } else {
          if (nbrightness==1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
              const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)(nopacity**(col++) + *ptrd*copacity); ptrd+=whd; }
              ptrd-=offx;
            }
            zleft+=pentez;
          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
              const tc *col = color; cimg_forC(*this,c) { *ptrd = (T)(nopacity*nbrightness**(col++) + *ptrd*copacity); ptrd+=whd; }
              ptrd-=offx;
            }
            zleft+=pentez;
          } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
              const tc *col = color;
              cimg_forC(*this,c) {
                const T val = (T)((2-nbrightness)**(col++) + (nbrightness-1)*maxval);
                *ptrd = (T)(nopacity*val + *ptrd*copacity);
                ptrd+=whd;
              }
              ptrd-=offx;
            }
            zleft+=pentez;
          }
        }
        zr+=pzr; zl+=pzl;
      }
      return *this;
    }

    //! Draw a 2d Gouraud-shaded colored triangle.
    /**
       \param x0 = X-coordinate of the first corner in the instance image.
       \param y0 = Y-coordinate of the first corner in the instance image.
       \param x1 = X-coordinate of the second corner in the instance image.
       \param y1 = Y-coordinate of the second corner in the instance image.
       \param x2 = X-coordinate of the third corner in the instance image.
       \param y2 = Y-coordinate of the third corner in the instance image.
       \param color = array of spectrum() values of type \c T, defining the global drawing color.
       \param brightness0 = brightness of the first corner (in [0,2]).
       \param brightness1 = brightness of the second corner (in [0,2]).
       \param brightness2 = brightness of the third corner (in [0,2]).
       \param opacity = opacity of the drawing.
       \note Clipping is supported.
    **/
    template<typename tc>
    CImg<T>& draw_triangle(const int x0, const int y0,
                           const int x1, const int y1,
                           const int x2, const int y2,
                           const tc *const color,
                           const float brightness0,
                           const float brightness1,
                           const float brightness2,
                           const float opacity=1) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const int whd = _width*_height*_depth, offx = _spectrum*whd-1;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nc0,nc1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nc0,nc2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nc1,nc2);
      if (ny0>=height() || ny2<0) return *this;
      _cimg_for_triangle2(*this,xleft0,cleft0,xright0,cright0,y,nx0,ny0,nc0,nx1,ny1,nc1,nx2,ny2,nc2) {
        int xleft = xleft0, xright = xright0, cleft = cleft0, cright = cright0;
        if (xright<xleft) cimg::swap(xleft,xright,cleft,cright);
        const int
          dx = xright - xleft,
          dc = cright>cleft?cright - cleft:cleft - cright,
          rc = dx?(cright - cleft)/dx:0,
          sc = cright>cleft?1:-1,
          ndc = dc-(dx?dx*(dc/dx):0);
        int errc = dx>>1;
        if (xleft<0 && dx) cleft-=xleft*(cright - cleft)/dx;
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width() - 1;
        T* ptrd = data(xleft,y);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
          const tc *col = color;
          cimg_forC(*this,c) {
            *ptrd = (T)(cleft<256?cleft**(col++)/256:((512-cleft)**(col++)+(cleft-256)*maxval)/256);
            ptrd+=whd;
          }
          ptrd-=offx;
          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
        } else for (int x = xleft; x<=xright; ++x) {
          const tc *col = color;
          cimg_forC(*this,c) {
            const T val = (T)(cleft<256?cleft**(col++)/256:((512-cleft)**(col++)+(cleft-256)*maxval)/256);
            *ptrd = (T)(nopacity*val + *ptrd*copacity);
            ptrd+=whd;
          }
          ptrd-=offx;
          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
        }
      }
      return *this;
    }

    //! Draw a 2d Gouraud-shaded colored triangle, with z-buffering.
    template<typename tz, typename tc>
    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
                           const int x0, const int y0, const float z0,
                           const int x1, const int y1, const float z1,
                           const int x2, const int y2, const float z2,
                           const tc *const color,
                           const float brightness0,
                           const float brightness1,
                           const float brightness2,
                           const float opacity=1) {
      typedef typename cimg::superset<tz,float>::type tzfloat;
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Specified color is (null).",
                                    cimg_instance);
      if (!is_sameXY(zbuffer))
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Instance and specified Z-buffer (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);

      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const int whd = _width*_height*_depth, offx = _spectrum*whd;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nz0,nz1,nc0,nc1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nz0,nz2,nc0,nc2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nz1,nz2,nc1,nc2);
      if (ny0>=height() || ny2<0) return *this;
      tzfloat
        pzl = (nz1 - nz0)/(ny1 - ny0),
        pzr = (nz2 - nz0)/(ny2 - ny0),
        pzn = (nz2 - nz1)/(ny2 - ny1),
        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
      _cimg_for_triangle2(*this,xleft0,cleft0,xright0,cright0,y,nx0,ny0,nc0,nx1,ny1,nc1,nx2,ny2,nc2) {
        if (y==ny1) { zl = nz1; pzl = pzn; }
        int xleft = xleft0, xright = xright0, cleft = cleft0, cright = cright0;
        tzfloat zleft = zl, zright = zr;
        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,cleft,cright);
        const int
          dx = xright - xleft,
          dc = cright>cleft?cright - cleft:cleft - cright,
          rc = dx?(cright-cleft)/dx:0,
          sc = cright>cleft?1:-1,
          ndc = dc-(dx?dx*(dc/dx):0);
        const tzfloat pentez = (zright - zleft)/dx;
        int errc = dx>>1;
        if (xleft<0 && dx) {
          cleft-=xleft*(cright - cleft)/dx;
          zleft-=xleft*(zright - zleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T *ptrd = data(xleft,y);
        tz *ptrz = zbuffer.data(xleft,y);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x, ++ptrd, ++ptrz) {
            if (zleft>=(tzfloat)*ptrz) {
              *ptrz = (tz)zleft;
              const tc *col = color;
              cimg_forC(*this,c) {
                *ptrd = (T)(cleft<256?cleft**(col++)/256:((512-cleft)**(col++)+(cleft-256)*maxval)/256);
                ptrd+=whd;
              }
              ptrd-=offx;
            }
            zleft+=pentez;
            cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
          } else for (int x = xleft; x<=xright; ++x, ++ptrd, ++ptrz) {
            if (zleft>=(tzfloat)*ptrz) {
              *ptrz = (tz)zleft;
              const tc *col = color;
              cimg_forC(*this,c) {
                const T val = (T)(cleft<256?cleft**(col++)/256:((512-cleft)**(col++)+(cleft-256)*maxval)/256);
                *ptrd = (T)(nopacity*val + *ptrd*copacity);
                ptrd+=whd;
              }
              ptrd-=offx;
            }
            zleft+=pentez;
            cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
          }
        zr+=pzr; zl+=pzl;
      }
      return *this;
    }

    //! Draw a colored triangle with interpolated colors.
    template<typename tc1, typename tc2, typename tc3>
    CImg<T>& draw_triangle(const int x0, const int y0,
                           const int x1, const int y1,
                           const int x2, const int y2,
                           const tc1 *const color1,
                           const tc2 *const color2,
                           const tc3 *const color3,
                           const float opacity=1) {
      const unsigned char one = 1;
      cimg_forC(*this,c) get_shared_channel(c).draw_triangle(x0,y0,x1,y1,x2,y2,&one,color1[c],color2[c],color3[c],opacity);
      return *this;
    }

    //! Draw a 2d textured triangle.
    /**
       \param x0 = X-coordinate of the first corner in the instance image.
       \param y0 = Y-coordinate of the first corner in the instance image.
       \param x1 = X-coordinate of the second corner in the instance image.
       \param y1 = Y-coordinate of the second corner in the instance image.
       \param x2 = X-coordinate of the third corner in the instance image.
       \param y2 = Y-coordinate of the third corner in the instance image.
       \param texture = texture image used to fill the triangle.
       \param tx0 = X-coordinate of the first corner in the texture image.
       \param ty0 = Y-coordinate of the first corner in the texture image.
       \param tx1 = X-coordinate of the second corner in the texture image.
       \param ty1 = Y-coordinate of the second corner in the texture image.
       \param tx2 = X-coordinate of the third corner in the texture image.
       \param ty2 = Y-coordinate of the third corner in the texture image.
       \param opacity = opacity of the drawing.
       \param brightness = brightness of the drawing (in [0,2]).
       \note Clipping is supported, but texture coordinates do not support clipping.
    **/
    template<typename tc>
    CImg<T>& draw_triangle(const int x0, const int y0,
                           const int x1, const int y1,
                           const int x2, const int y2,
                           const CImg<tc>& texture,
                           const int tx0, const int ty0,
                           const int tx1, const int ty1,
                           const int tx2, const int ty2,
                           const float opacity=1,
                           const float brightness=1) {
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);

      if (is_empty()) return *this;
      if (is_overlapped(texture)) return draw_triangle(x0,y0,x1,y1,x2,y2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,opacity,brightness);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float
        nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0),
        nbrightness = brightness<0?0:(brightness>2?2:brightness);
      const int whd = _width*_height*_depth, twhd = texture._width*texture._height*texture._depth, offx = _spectrum*whd-1;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        ntx0 = tx0, nty0 = ty0, ntx1 = tx1, nty1 = ty1, ntx2 = tx2, nty2 = ty2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2);
      if (ny0>=height() || ny2<0) return *this;
      _cimg_for_triangle3(*this,xleft0,txleft0,tyleft0,xright0,txright0,tyright0,y,
                          nx0,ny0,ntx0,nty0,nx1,ny1,ntx1,nty1,nx2,ny2,ntx2,nty2) {
        int
          xleft = xleft0, xright = xright0,
          txleft = txleft0, txright = txright0,
          tyleft = tyleft0, tyright = tyright0;
        if (xright<xleft) cimg::swap(xleft,xright,txleft,txright,tyleft,tyright);
        const int
          dx = xright - xleft,
          dtx = txright>txleft?txright - txleft:txleft - txright,
          dty = tyright>tyleft?tyright - tyleft:tyleft - tyright,
          rtx = dx?(txright - txleft)/dx:0,
          rty = dx?(tyright - tyleft)/dx:0,
          stx = txright>txleft?1:-1,
          sty = tyright>tyleft?1:-1,
          ndtx = dtx - (dx?dx*(dtx/dx):0),
          ndty = dty - (dx?dx*(dty/dx):0);
        int errtx = dx>>1, errty = errtx;
        if (xleft<0 && dx) {
          txleft-=xleft*(txright - txleft)/dx;
          tyleft-=xleft*(tyright - tyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T* ptrd = data(xleft,y,0,0);
        if (opacity>=1) {
          if (nbrightness==1) for (int x = xleft; x<=xright; ++x) {
            const tc *col = texture.data(txleft,tyleft);
            cimg_forC(*this,c) {
              *ptrd = (T)*col;
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx;
            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x) {
            const tc *col = texture.data(txleft,tyleft);
            cimg_forC(*this,c) {
              *ptrd = (T)(nbrightness**col);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx;
            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
          } else for (int x = xleft; x<=xright; ++x) {
            const tc *col = texture.data(txleft,tyleft);
            cimg_forC(*this,c) {
              *ptrd = (T)((2-nbrightness)**(col++) + (nbrightness-1)*maxval);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx;
            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
          }
        } else {
          if (nbrightness==1) for (int x = xleft; x<=xright; ++x) {
            const tc *col = texture.data(txleft,tyleft);
            cimg_forC(*this,c) {
              *ptrd = (T)(nopacity**col + *ptrd*copacity);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx;
            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x) {
            const tc *col = texture.data(txleft,tyleft);
            cimg_forC(*this,c) {
              *ptrd = (T)(nopacity*nbrightness**col + *ptrd*copacity);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx;
            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
          } else for (int x = xleft; x<=xright; ++x) {
            const tc *col = texture.data(txleft,tyleft);
            cimg_forC(*this,c) {
              const T val = (T)((2-nbrightness)**(col++) + (nbrightness-1)*maxval);
              *ptrd = (T)(nopacity*val + *ptrd*copacity);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx;
            txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
            tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
          }
        }
      }
      return *this;
    }

    //! Draw a 2d textured triangle, with perspective correction.
    template<typename tc>
    CImg<T>& draw_triangle(const int x0, const int y0, const float z0,
                           const int x1, const int y1, const float z1,
                           const int x2, const int y2, const float z2,
                           const CImg<tc>& texture,
                           const int tx0, const int ty0,
                           const int tx1, const int ty1,
                           const int tx2, const int ty2,
                           const float opacity=1,
                           const float brightness=1) {
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);

      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
      if (is_overlapped(texture)) return draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,opacity,brightness);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float
        nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0),
        nbrightness = brightness<0?0:(brightness>2?2:brightness);
      const int whd = _width*_height*_depth, twhd = texture._width*texture._height*texture._depth, offx = _spectrum*whd-1;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2;
      float
        ntx0 = tx0/z0, nty0 = ty0/z0,
        ntx1 = tx1/z1, nty1 = ty1/z1,
        ntx2 = tx2/z2, nty2 = ty2/z2,
        nz0 = 1/z0, nz1 = 1/z1, nz2 = 1/z2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nz0,nz1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nz0,nz2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nz1,nz2);
      if (ny0>=height() || ny2<0) return *this;
      float
        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
        ptyl = (nty1 - nty0)/(ny1 - ny0),
        ptyr = (nty2 - nty0)/(ny2 - ny0),
        ptyn = (nty2 - nty1)/(ny2 - ny1),
        pzl = (nz1 - nz0)/(ny1 - ny0),
        pzr = (nz2 - nz0)/(ny2 - ny0),
        pzn = (nz2 - nz1)/(ny2 - ny1),
        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1))),
        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):(ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):(ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
      _cimg_for_triangle1(*this,xleft0,xright0,y,nx0,ny0,nx1,ny1,nx2,ny2) {
        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
        int xleft = xleft0, xright = xright0;
        float
          zleft = zl, zright = zr,
          txleft = txl, txright = txr,
          tyleft = tyl, tyright = tyr;
        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright);
        const int dx = xright - xleft;
        const float
          pentez = (zright - zleft)/dx,
          pentetx = (txright - txleft)/dx,
          pentety = (tyright - tyleft)/dx;
        if (xleft<0 && dx) {
          zleft-=xleft*(zright - zleft)/dx;
          txleft-=xleft*(txright - txleft)/dx;
          tyleft-=xleft*(tyright - tyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T* ptrd = data(xleft,y,0,0);
        if (opacity>=1) {
          if (nbrightness==1) for (int x = xleft; x<=xright; ++x) {
            const float invz = 1/zleft;
            const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
            cimg_forC(*this,c) {
              *ptrd = (T)*col;
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          } else if (nbrightness<1) for (int x=xleft; x<=xright; ++x) {
            const float invz = 1/zleft;
            const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
            cimg_forC(*this,c) {
              *ptrd = (T)(nbrightness**col);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          } else for (int x = xleft; x<=xright; ++x) {
            const float invz = 1/zleft;
            const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
            cimg_forC(*this,c) {
              *ptrd = (T)((2-nbrightness)**col + (nbrightness-1)*maxval);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          }
        } else {
          if (nbrightness==1) for (int x = xleft; x<=xright; ++x) {
            const float invz = 1/zleft;
            const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
            cimg_forC(*this,c) {
              *ptrd = (T)(nopacity**col + *ptrd*copacity);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x) {
            const float invz = 1/zleft;
            const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
            cimg_forC(*this,c) {
              *ptrd = (T)(nopacity*nbrightness**col + *ptrd*copacity);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          } else for (int x = xleft; x<=xright; ++x) {
            const float invz = 1/zleft;
            const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
            cimg_forC(*this,c) {
              const T val = (T)((2-nbrightness)**col + (nbrightness-1)*maxval);
              *ptrd = (T)(nopacity*val + *ptrd*copacity);
              ptrd+=whd; col+=twhd;
            }
            ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          }
        }
        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
      }
      return *this;
    }

    //! Draw a 2d textured triangle, with z-buffering and perspective correction.
    template<typename tz, typename tc>
    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
                           const int x0, const int y0, const float z0,
                           const int x1, const int y1, const float z1,
                           const int x2, const int y2, const float z2,
                           const CImg<tc>& texture,
                           const int tx0, const int ty0,
                           const int tx1, const int ty1,
                           const int tx2, const int ty2,
                           const float opacity=1,
                           const float brightness=1) {
      typedef typename cimg::superset<tz,float>::type tzfloat;
      if (!is_sameXY(zbuffer))
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Instance and specified Z-buffer (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);

      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);

      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
      if (is_overlapped(texture)) return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,opacity,brightness);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float
        nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0),
        nbrightness = brightness<0?0:(brightness>2?2:brightness);
      const int whd = _width*_height*_depth, twhd = texture._width*texture._height*texture._depth, offx = _spectrum*whd;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2;
      float
        ntx0 = tx0/z0, nty0 = ty0/z0,
        ntx1 = tx1/z1, nty1 = ty1/z1,
        ntx2 = tx2/z2, nty2 = ty2/z2;
      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nz0,nz1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nz0,nz2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nz1,nz2);
      if (ny0>=height() || ny2<0) return *this;
      float
        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
        ptyl = (nty1 - nty0)/(ny1 - ny0),
        ptyr = (nty2 - nty0)/(ny2 - ny0),
        ptyn = (nty2 - nty1)/(ny2 - ny1),
        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):(ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):(ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
      tzfloat
        pzl = (nz1 - nz0)/(ny1 - ny0),
        pzr = (nz2 - nz0)/(ny2 - ny0),
        pzn = (nz2 - nz1)/(ny2 - ny1),
        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
      _cimg_for_triangle1(*this,xleft0,xright0,y,nx0,ny0,nx1,ny1,nx2,ny2) {
        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
        int xleft = xleft0, xright = xright0;
        float txleft = txl, txright = txr, tyleft = tyl, tyright = tyr;
        tzfloat zleft = zl, zright = zr;
        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright);
        const int dx = xright - xleft;
        const float pentetx = (txright - txleft)/dx, pentety = (tyright - tyleft)/dx;
        const tzfloat pentez = (zright - zleft)/dx;
        if (xleft<0 && dx) {
          zleft-=xleft*(zright - zleft)/dx;
          txleft-=xleft*(txright - txleft)/dx;
          tyleft-=xleft*(tyright - tyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T *ptrd = data(xleft,y,0,0);
        tz *ptrz = zbuffer.data(xleft,y);
        if (opacity>=1) {
          if (nbrightness==1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
                const tzfloat invz = 1/zleft;
                const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
                cimg_forC(*this,c) {
                  *ptrd = (T)*col;
                  ptrd+=whd; col+=twhd;
                }
                ptrd-=offx;
              }
              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
                const tzfloat invz = 1/zleft;
                const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
                cimg_forC(*this,c) {
                  *ptrd = (T)(nbrightness**col);
                  ptrd+=whd; col+=twhd;
                }
                ptrd-=offx;
              }
              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
                const tzfloat invz = 1/zleft;
                const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
                cimg_forC(*this,c) {
                  *ptrd = (T)((2-nbrightness)**col + (nbrightness-1)*maxval);
                  ptrd+=whd; col+=twhd;
                }
                ptrd-=offx;
              }
              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            }
        } else {
          if (nbrightness==1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
                const tzfloat invz = 1/zleft;
                const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
                cimg_forC(*this,c) {
                  *ptrd = (T)(nopacity**col + *ptrd*copacity);
                  ptrd+=whd; col+=twhd;
                }
                ptrd-=offx;
              }
              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            } else if (nbrightness<1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
                const tzfloat invz = 1/zleft;
                const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
                cimg_forC(*this,c) {
                  *ptrd = (T)(nopacity*nbrightness**col + *ptrd*copacity);
                  ptrd+=whd; col+=twhd;
                }
                ptrd-=offx;
              }
              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
              if (zleft>=(tzfloat)*ptrz) {
                *ptrz = (tz)zleft;
                const tzfloat invz = 1/zleft;
                const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
                cimg_forC(*this,c) {
                  const T val = (T)((2-nbrightness)**col + (nbrightness-1)*maxval);
                  *ptrd = (T)(nopacity*val + *ptrd*copacity);
                  ptrd+=whd; col+=twhd;
                }
                ptrd-=offx;
              }
              zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            }
        }
        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
      }
      return *this;
    }

    //! Draw a 2d Pseudo-Phong-shaded triangle.
    /**
       \param x0 = X-coordinate of the first corner in the instance image.
       \param y0 = Y-coordinate of the first corner in the instance image.
       \param x1 = X-coordinate of the second corner in the instance image.
       \param y1 = Y-coordinate of the second corner in the instance image.
       \param x2 = X-coordinate of the third corner in the instance image.
       \param y2 = Y-coordinate of the third corner in the instance image.
       \param color = array of spectrum() values of type \c T, defining the global drawing color.
       \param light = light image.
       \param lx0 = X-coordinate of the first corner in the light image.
       \param ly0 = Y-coordinate of the first corner in the light image.
       \param lx1 = X-coordinate of the second corner in the light image.
       \param ly1 = Y-coordinate of the second corner in the light image.
       \param lx2 = X-coordinate of the third corner in the light image.
       \param ly2 = Y-coordinate of the third corner in the light image.
       \param opacity = opacity of the drawing.
       \note Clipping is supported, but texture coordinates do not support clipping.
    **/
    template<typename tc, typename tl>
    CImg<T>& draw_triangle(const int x0, const int y0,
                           const int x1, const int y1,
                           const int x2, const int y2,
                           const tc *const color,
                           const CImg<tl>& light,
                           const int lx0, const int ly0,
                           const int lx1, const int ly1,
                           const int lx2, const int ly2,
                           const float opacity=1) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle : Specified color is (null).",
                                    cimg_instance);
      if (light._depth>1 || light._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified light texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);

      if (is_empty()) return *this;
      if (is_overlapped(light)) return draw_triangle(x0,y0,x1,y1,x2,y2,color,+light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
      const int whd = _width*_height*_depth, offx = _spectrum*whd-1;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nlx0,nlx1,nly0,nly1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nlx0,nlx2,nly0,nly2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nlx1,nlx2,nly1,nly2);
      if (ny0>=height() || ny2<0) return *this;
      _cimg_for_triangle3(*this,xleft0,lxleft0,lyleft0,xright0,lxright0,lyright0,y,
                          nx0,ny0,nlx0,nly0,nx1,ny1,nlx1,nly1,nx2,ny2,nlx2,nly2) {
        int
          xleft = xleft0, xright = xright0,
          lxleft = lxleft0, lxright = lxright0,
          lyleft = lyleft0, lyright = lyright0;
        if (xright<xleft) cimg::swap(xleft,xright,lxleft,lxright,lyleft,lyright);
        const int
          dx = xright - xleft,
          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
          rlx = dx?(lxright - lxleft)/dx:0,
          rly = dx?(lyright - lyleft)/dx:0,
          slx = lxright>lxleft?1:-1,
          sly = lyright>lyleft?1:-1,
          ndlx = dlx - (dx?dx*(dlx/dx):0),
          ndly = dly - (dx?dx*(dly/dx):0);
        int errlx = dx>>1, errly = errlx;
        if (xleft<0 && dx) {
          lxleft-=xleft*(lxright - lxleft)/dx;
          lyleft-=xleft*(lyright - lyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T* ptrd = data(xleft,y,0,0);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
          const tc *col = color;
          cimg_forC(*this,c) {
            const tl l = light(lxleft,lyleft,c);
            *ptrd = (T)(l<1?l**(col++):((2-l)**(col++)+(l-1)*maxval));
            ptrd+=whd;
          }
          ptrd-=offx;
          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
        } else  for (int x = xleft; x<=xright; ++x) {
          const tc *col = color;
          cimg_forC(*this,c) {
            const tl l = light(lxleft,lyleft,c);
            const T val = (T)(l<1?l**(col++):((2-l)**(col++)+(l-1)*maxval));
            *ptrd = (T)(nopacity*val + *ptrd*copacity);
            ptrd+=whd;
          }
          ptrd-=offx;
          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
        }
      }
      return *this;
    }

    //! Draw a 2d Pseudo-Phong-shaded triangle, with z-buffering.
    template<typename tz, typename tc, typename tl>
    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
                           const int x0, const int y0, const float z0,
                           const int x1, const int y1, const float z1,
                           const int x2, const int y2, const float z2,
                           const tc *const color,
                           const CImg<tl>& light,
                           const int lx0, const int ly0,
                           const int lx1, const int ly1,
                           const int lx2, const int ly2,
                           const float opacity=1) {
      typedef typename cimg::superset<tz,float>::type tzfloat;
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Specified color is (null).",
                                    cimg_instance);
      if (light._depth>1 || light._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified light texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);
      if (!is_sameXY(zbuffer))
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Instance and specified Z-buffer (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);

      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
      if (is_overlapped(light)) return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,
                                                     +light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const int whd = _width*_height*_depth, offx = _spectrum*whd;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,nlx0,nlx1,nly0,nly1,nz0,nz1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,nlx0,nlx2,nly0,nly2,nz0,nz2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,nlx1,nlx2,nly1,nly2,nz1,nz2);
      if (ny0>=height() || ny2<0) return *this;
      tzfloat
        pzl = (nz1 - nz0)/(ny1 - ny0),
        pzr = (nz2 - nz0)/(ny2 - ny0),
        pzn = (nz2 - nz1)/(ny2 - ny1),
        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
      _cimg_for_triangle3(*this,xleft0,lxleft0,lyleft0,xright0,lxright0,lyright0,y,
                          nx0,ny0,nlx0,nly0,nx1,ny1,nlx1,nly1,nx2,ny2,nlx2,nly2) {
        if (y==ny1) { zl = nz1; pzl = pzn; }
        int
          xleft = xleft0, xright = xright0,
          lxleft = lxleft0, lxright = lxright0,
          lyleft = lyleft0, lyright = lyright0;
        tzfloat zleft = zl, zright = zr;
        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,lxleft,lxright,lyleft,lyright);
        const int
          dx = xright - xleft,
          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
          rlx = dx?(lxright - lxleft)/dx:0,
          rly = dx?(lyright - lyleft)/dx:0,
          slx = lxright>lxleft?1:-1,
          sly = lyright>lyleft?1:-1,
          ndlx = dlx - (dx?dx*(dlx/dx):0),
          ndly = dly - (dx?dx*(dly/dx):0);
        const tzfloat pentez = (zright - zleft)/dx;
        int errlx = dx>>1, errly = errlx;
        if (xleft<0 && dx) {
          zleft-=xleft*(zright - zleft)/dx;
          lxleft-=xleft*(lxright - lxleft)/dx;
          lyleft-=xleft*(lyright - lyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T *ptrd = data(xleft,y,0,0);
        tz *ptrz = zbuffer.data(xleft,y);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
            if (zleft>=(tzfloat)*ptrz) {
              *ptrz = (tz)zleft;
              const tc *col = color;
              cimg_forC(*this,c) {
                const tl l = light(lxleft,lyleft,c);
                const tc cval = *(col++);
                *ptrd = (T)(l<1?l*cval:(2-l)*cval+(l-1)*maxval);
                ptrd+=whd;
              }
              ptrd-=offx;
            }
            zleft+=pentez;
            lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
            lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
          } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
            if (zleft>=(tzfloat)*ptrz) {
              *ptrz = (tz)zleft;
              const tc *col = color;
              cimg_forC(*this,c) {
                const tl l = light(lxleft,lyleft,c);
                const tc cval = *(col++);
                const T val = (T)(l<1?l*cval:(2-l)*cval+(l-1)*maxval);
                *ptrd = (T)(nopacity*val + *ptrd*copacity);
                ptrd+=whd;
              }
              ptrd-=offx;
            }
            zleft+=pentez;
            lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
            lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
          }
        zr+=pzr; zl+=pzl;
      }
      return *this;
    }

    //! Draw a 2d Gouraud-shaded textured triangle.
    /**
       \param x0 = X-coordinate of the first corner in the instance image.
       \param y0 = Y-coordinate of the first corner in the instance image.
       \param x1 = X-coordinate of the second corner in the instance image.
       \param y1 = Y-coordinate of the second corner in the instance image.
       \param x2 = X-coordinate of the third corner in the instance image.
       \param y2 = Y-coordinate of the third corner in the instance image.
       \param texture = texture image used to fill the triangle.
       \param tx0 = X-coordinate of the first corner in the texture image.
       \param ty0 = Y-coordinate of the first corner in the texture image.
       \param tx1 = X-coordinate of the second corner in the texture image.
       \param ty1 = Y-coordinate of the second corner in the texture image.
       \param tx2 = X-coordinate of the third corner in the texture image.
       \param ty2 = Y-coordinate of the third corner in the texture image.
       \param brightness0 = brightness value of the first corner.
       \param brightness1 = brightness value of the second corner.
       \param brightness2 = brightness value of the third corner.
       \param opacity = opacity of the drawing.
       \note Clipping is supported, but texture coordinates do not support clipping.
    **/
    template<typename tc>
    CImg<T>& draw_triangle(const int x0, const int y0,
                           const int x1, const int y1,
                           const int x2, const int y2,
                           const CImg<tc>& texture,
                           const int tx0, const int ty0,
                           const int tx1, const int ty1,
                           const int tx2, const int ty2,
                           const float brightness0,
                           const float brightness1,
                           const float brightness2,
                           const float opacity=1) {
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);

      if (is_empty()) return *this;
      if (is_overlapped(texture))
        return draw_triangle(x0,y0,x1,y1,x2,y2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,brightness0,brightness1,brightness2,opacity);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const int whd = _width*_height*_depth, twhd = texture._width*texture._height*texture._depth, offx = _spectrum*whd-1;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        ntx0 = tx0, nty0 = ty0, ntx1 = tx1, nty1 = ty1, ntx2 = tx2, nty2 = ty2,
        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nc0,nc1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nc0,nc2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nc1,nc2);
      if (ny0>=height() || ny2<0) return *this;
      _cimg_for_triangle4(*this,xleft0,cleft0,txleft0,tyleft0,xright0,cright0,txright0,tyright0,y,
                          nx0,ny0,nc0,ntx0,nty0,nx1,ny1,nc1,ntx1,nty1,nx2,ny2,nc2,ntx2,nty2) {
        int
          xleft = xleft0, xright = xright0,
          cleft = cleft0, cright = cright0,
          txleft = txleft0, txright = txright0,
          tyleft = tyleft0, tyright = tyright0;
        if (xright<xleft) cimg::swap(xleft,xright,cleft,cright,txleft,txright,tyleft,tyright);
        const int
          dx = xright - xleft,
          dc = cright>cleft?cright - cleft:cleft - cright,
          dtx = txright>txleft?txright - txleft:txleft - txright,
          dty = tyright>tyleft?tyright - tyleft:tyleft - tyright,
          rc = dx?(cright - cleft)/dx:0,
          rtx = dx?(txright - txleft)/dx:0,
          rty = dx?(tyright - tyleft)/dx:0,
          sc = cright>cleft?1:-1,
          stx = txright>txleft?1:-1,
          sty = tyright>tyleft?1:-1,
          ndc = dc - (dx?dx*(dc/dx):0),
          ndtx = dtx - (dx?dx*(dtx/dx):0),
          ndty = dty - (dx?dx*(dty/dx):0);
        int errc = dx>>1, errtx = errc, errty = errc;
        if (xleft<0 && dx) {
          cleft-=xleft*(cright - cleft)/dx;
          txleft-=xleft*(txright - txleft)/dx;
          tyleft-=xleft*(tyright - tyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T* ptrd = data(xleft,y,0,0);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
          const tc *col = texture.data(txleft,tyleft);
          cimg_forC(*this,c) {
            *ptrd = (T)(cleft<256?cleft**col/256:((512-cleft)**col+(cleft-256)*maxval)/256);
            ptrd+=whd; col+=twhd;
          }
          ptrd-=offx;
          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
          txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
          tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
        } else for (int x = xleft; x<=xright; ++x) {
          const tc *col = texture.data(txleft,tyleft);
          cimg_forC(*this,c) {
            const T val = (T)(cleft<256?cleft**col/256:((512-cleft)**col+(cleft-256)*maxval)/256);
            *ptrd = (T)(nopacity*val + *ptrd*copacity);
            ptrd+=whd; col+=twhd;
          }
          ptrd-=offx;
          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
          txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
          tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
        }
      }
      return *this;
    }

    //! Draw a 2d Gouraud-shaded textured triangle, with perspective correction.
    template<typename tc>
    CImg<T>& draw_triangle(const int x0, const int y0, const float z0,
                           const int x1, const int y1, const float z1,
                           const int x2, const int y2, const float z2,
                           const CImg<tc>& texture,
                           const int tx0, const int ty0,
                           const int tx1, const int ty1,
                           const int tx2, const int ty2,
                           const float brightness0,
                           const float brightness1,
                           const float brightness2,
                           const float opacity=1) {
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);

      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
      if (is_overlapped(texture)) return draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,
                                                       brightness0,brightness1,brightness2,opacity);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const int whd = _width*_height*_depth, twhd = texture._width*texture._height*texture._depth, offx = _spectrum*whd-1;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
      float
        ntx0 = tx0/z0, nty0 = ty0/z0,
        ntx1 = tx1/z1, nty1 = ty1/z1,
        ntx2 = tx2/z2, nty2 = ty2/z2,
        nz0 = 1/z0, nz1 = 1/z1, nz2 = 1/z2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nz0,nz1,nc0,nc1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nz0,nz2,nc0,nc2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nz1,nz2,nc1,nc2);
      if (ny0>=height() || ny2<0) return *this;
      float
        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
        ptyl = (nty1 - nty0)/(ny1 - ny0),
        ptyr = (nty2 - nty0)/(ny2 - ny0),
        ptyn = (nty2 - nty1)/(ny2 - ny1),
        pzl = (nz1 - nz0)/(ny1 - ny0),
        pzr = (nz2 - nz0)/(ny2 - ny0),
        pzn = (nz2 - nz1)/(ny2 - ny1),
        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1))),
        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):(ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):(ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
      _cimg_for_triangle2(*this,xleft0,cleft0,xright0,cright0,y,nx0,ny0,nc0,nx1,ny1,nc1,nx2,ny2,nc2) {
        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
        int
          xleft = xleft0, xright = xright0,
          cleft = cleft0, cright = cright0;
        float
          zleft = zl, zright = zr,
          txleft = txl, txright = txr,
          tyleft = tyl, tyright = tyr;
        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright,cleft,cright);
        const int
          dx = xright - xleft,
          dc = cright>cleft?cright - cleft:cleft - cright,
          rc = dx?(cright - cleft)/dx:0,
          sc = cright>cleft?1:-1,
          ndc = dc - (dx?dx*(dc/dx):0);
        const float
          pentez = (zright - zleft)/dx,
          pentetx = (txright - txleft)/dx,
          pentety = (tyright - tyleft)/dx;
        int errc = dx>>1;
        if (xleft<0 && dx) {
          cleft-=xleft*(cright - cleft)/dx;
          zleft-=xleft*(zright - zleft)/dx;
          txleft-=xleft*(txright - txleft)/dx;
          tyleft-=xleft*(tyright - tyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T* ptrd = data(xleft,y,0,0);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
          const float invz = 1/zleft;
          const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
          cimg_forC(*this,c) {
            *ptrd = (T)(cleft<256?cleft**col/256:((512-cleft)**col+(cleft-256)*maxval)/256);
            ptrd+=whd; col+=twhd;
          }
          ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
        } else for (int x = xleft; x<=xright; ++x) {
          const float invz = 1/zleft;
          const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
          cimg_forC(*this,c) {
            const T val = (T)(cleft<256?cleft**col/256:((512-cleft)**col+(cleft-256)*maxval)/256);
            *ptrd = (T)(nopacity*val + *ptrd*copacity);
            ptrd+=whd; col+=twhd;
          }
          ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
        }
        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
      }
      return *this;
    }

    //! Draw a 2d Gouraud-shaded textured triangle, with z-buffering and perspective correction.
    template<typename tz, typename tc>
    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
                           const int x0, const int y0, const float z0,
                           const int x1, const int y1, const float z1,
                           const int x2, const int y2, const float z2,
                           const CImg<tc>& texture,
                           const int tx0, const int ty0,
                           const int tx1, const int ty1,
                           const int tx2, const int ty2,
                           const float brightness0,
                           const float brightness1,
                           const float brightness2,
                           const float opacity=1) {
      typedef typename cimg::superset<tz,float>::type tzfloat;
      if (!is_sameXY(zbuffer))
        throw CImgArgumentException(_cimg_instance
                                    "draw_line() : Instance and specified Z-buffer (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);

      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);

      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
      if (is_overlapped(texture)) return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,
                                                       brightness0,brightness1,brightness2,opacity);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const int whd = _width*_height*_depth, twhd = texture._width*texture._height*texture._depth, offx = _spectrum*whd;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        nc0 = (int)((brightness0<0.0f?0.0f:(brightness0>2.0f?2.0f:brightness0))*256.0f),
        nc1 = (int)((brightness1<0.0f?0.0f:(brightness1>2.0f?2.0f:brightness1))*256.0f),
        nc2 = (int)((brightness2<0.0f?0.0f:(brightness2>2.0f?2.0f:brightness2))*256.0f);
      float
        ntx0 = tx0/z0, nty0 = ty0/z0,
        ntx1 = tx1/z1, nty1 = ty1/z1,
        ntx2 = tx2/z2, nty2 = ty2/z2;
      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nz0,nz1,nc0,nc1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nz0,nz2,nc0,nc2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nz1,nz2,nc1,nc2);
      if (ny0>=height() || ny2<0) return *this;
      float
        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
        ptyl = (nty1 - nty0)/(ny1 - ny0),
        ptyr = (nty2 - nty0)/(ny2 - ny0),
        ptyn = (nty2 - nty1)/(ny2 - ny1),
        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):(ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):(ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
      tzfloat
        pzl = (nz1 - nz0)/(ny1 - ny0),
        pzr = (nz2 - nz0)/(ny2 - ny0),
        pzn = (nz2 - nz1)/(ny2 - ny1),
        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
      _cimg_for_triangle2(*this,xleft0,cleft0,xright0,cright0,y,nx0,ny0,nc0,nx1,ny1,nc1,nx2,ny2,nc2) {
        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
        int xleft = xleft0, xright = xright0, cleft = cleft0, cright = cright0;
        float txleft = txl, txright = txr, tyleft = tyl, tyright = tyr;
        tzfloat zleft = zl, zright = zr;
        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright,cleft,cright);
        const int
          dx = xright - xleft,
          dc = cright>cleft?cright - cleft:cleft - cright,
          rc = dx?(cright - cleft)/dx:0,
          sc = cright>cleft?1:-1,
          ndc = dc - (dx?dx*(dc/dx):0);
        float pentetx = (txright - txleft)/dx, pentety = (tyright - tyleft)/dx;
        const tzfloat pentez = (zright - zleft)/dx;
        int errc = dx>>1;
        if (xleft<0 && dx) {
          cleft-=xleft*(cright - cleft)/dx;
          zleft-=xleft*(zright - zleft)/dx;
          txleft-=xleft*(txright - txleft)/dx;
          tyleft-=xleft*(tyright - tyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T* ptrd = data(xleft,y);
        tz *ptrz = zbuffer.data(xleft,y);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x, ++ptrd, ++ptrz) {
            if (zleft>=(tzfloat)*ptrz) {
              *ptrz = (tz)zleft;
              const tzfloat invz = 1/zleft;
              const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
              cimg_forC(*this,c) {
                *ptrd = (T)(cleft<256?cleft**col/256:((512-cleft)**col+(cleft-256)*maxval)/256);
                ptrd+=whd; col+=twhd;
              }
              ptrd-=offx;
            }
            zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
          } else for (int x = xleft; x<=xright; ++x, ++ptrd, ++ptrz) {
            if (zleft>=(tzfloat)*ptrz) {
              *ptrz = (tz)zleft;
              const tzfloat invz = 1/zleft;
              const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
              cimg_forC(*this,c) {
                const T val = (T)(cleft<256?cleft**col/256:((512-cleft)**col+(cleft-256)*maxval)/256);
                *ptrd = (T)(nopacity*val + *ptrd*copacity);
                ptrd+=whd; col+=twhd;
              }
              ptrd-=offx;
            }
            zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            cleft+=rc+((errc-=ndc)<0?errc+=dx,sc:0);
          }
        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
      }
      return *this;
    }

    //! Draw a 2d Pseudo-Phong-shaded textured triangle.
    /**
       \param x0 = X-coordinate of the first corner in the instance image.
       \param y0 = Y-coordinate of the first corner in the instance image.
       \param x1 = X-coordinate of the second corner in the instance image.
       \param y1 = Y-coordinate of the second corner in the instance image.
       \param x2 = X-coordinate of the third corner in the instance image.
       \param y2 = Y-coordinate of the third corner in the instance image.
       \param texture = texture image used to fill the triangle.
       \param tx0 = X-coordinate of the first corner in the texture image.
       \param ty0 = Y-coordinate of the first corner in the texture image.
       \param tx1 = X-coordinate of the second corner in the texture image.
       \param ty1 = Y-coordinate of the second corner in the texture image.
       \param tx2 = X-coordinate of the third corner in the texture image.
       \param ty2 = Y-coordinate of the third corner in the texture image.
       \param light = light image.
       \param lx0 = X-coordinate of the first corner in the light image.
       \param ly0 = Y-coordinate of the first corner in the light image.
       \param lx1 = X-coordinate of the second corner in the light image.
       \param ly1 = Y-coordinate of the second corner in the light image.
       \param lx2 = X-coordinate of the third corner in the light image.
       \param ly2 = Y-coordinate of the third corner in the light image.
       \param opacity = opacity of the drawing.
       \note Clipping is supported, but texture coordinates do not support clipping.
    **/
    template<typename tc, typename tl>
    CImg<T>& draw_triangle(const int x0, const int y0,
                           const int x1, const int y1,
                           const int x2, const int y2,
                           const CImg<tc>& texture,
                           const int tx0, const int ty0,
                           const int tx1, const int ty1,
                           const int tx2, const int ty2,
                           const CImg<tl>& light,
                           const int lx0, const int ly0,
                           const int lx1, const int ly1,
                           const int lx2, const int ly2,
                           const float opacity=1) {
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
      if (light._depth>1 || light._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified light texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);

      if (is_empty()) return *this;
      if (is_overlapped(texture)) return draw_triangle(x0,y0,x1,y1,x2,y2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
      if (is_overlapped(light))   return draw_triangle(x0,y0,x1,y1,x2,y2,texture,tx0,ty0,tx1,ty1,tx2,ty2,+light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const int whd = _width*_height*_depth, twhd = texture._width*texture._height*texture._depth, offx = _spectrum*whd-1;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        ntx0 = tx0, nty0 = ty0, ntx1 = tx1, nty1 = ty1, ntx2 = tx2, nty2 = ty2,
        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nlx0,nlx1,nly0,nly1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nlx0,nlx2,nly0,nly2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nlx1,nlx2,nly1,nly2);
      if (ny0>=height() || ny2<0) return *this;
      _cimg_for_triangle5(*this,xleft0,lxleft0,lyleft0,txleft0,tyleft0,xright0,lxright0,lyright0,txright0,tyright0,y,
                          nx0,ny0,nlx0,nly0,ntx0,nty0,nx1,ny1,nlx1,nly1,ntx1,nty1,nx2,ny2,nlx2,nly2,ntx2,nty2) {
        int
          xleft = xleft0, xright = xright0,
          lxleft = lxleft0, lxright = lxright0,
          lyleft = lyleft0, lyright = lyright0,
          txleft = txleft0, txright = txright0,
          tyleft = tyleft0, tyright = tyright0;
        if (xright<xleft) cimg::swap(xleft,xright,lxleft,lxright,lyleft,lyright,txleft,txright,tyleft,tyright);
        const int
          dx = xright - xleft,
          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
          dtx = txright>txleft?txright - txleft:txleft - txright,
          dty = tyright>tyleft?tyright - tyleft:tyleft - tyright,
          rlx = dx?(lxright - lxleft)/dx:0,
          rly = dx?(lyright - lyleft)/dx:0,
          rtx = dx?(txright - txleft)/dx:0,
          rty = dx?(tyright - tyleft)/dx:0,
          slx = lxright>lxleft?1:-1,
          sly = lyright>lyleft?1:-1,
          stx = txright>txleft?1:-1,
          sty = tyright>tyleft?1:-1,
          ndlx = dlx - (dx?dx*(dlx/dx):0),
          ndly = dly - (dx?dx*(dly/dx):0),
          ndtx = dtx - (dx?dx*(dtx/dx):0),
          ndty = dty - (dx?dx*(dty/dx):0);
        int errlx = dx>>1, errly = errlx, errtx = errlx, errty = errlx;
        if (xleft<0 && dx) {
          lxleft-=xleft*(lxright - lxleft)/dx;
          lyleft-=xleft*(lyright - lyleft)/dx;
          txleft-=xleft*(txright - txleft)/dx;
          tyleft-=xleft*(tyright - tyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T* ptrd = data(xleft,y,0,0);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
          const tc *col = texture.data(txleft,tyleft);
          cimg_forC(*this,c) {
            const tl l = light(lxleft,lyleft,c);
            *ptrd = (T)(l<1?l**col:(2-l)**col+(l-1)*maxval);
            ptrd+=whd; col+=twhd;
          }
          ptrd-=offx;
          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
          txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
          tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
        } else for (int x = xleft; x<=xright; ++x) {
          const tc *col = texture.data(txleft,tyleft);
          cimg_forC(*this,c) {
            const tl l = light(lxleft,lyleft,c);
            const T val = (T)(l<1?l**col:(2-l)**col+(l-1)*maxval);
            *ptrd = (T)(nopacity*val + *ptrd*copacity);
            ptrd+=whd; col+=twhd;
          }
          ptrd-=offx;
          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
          txleft+=rtx+((errtx-=ndtx)<0?errtx+=dx,stx:0);
          tyleft+=rty+((errty-=ndty)<0?errty+=dx,sty:0);
        }
      }
      return *this;
    }

    //! Draw a 2d Pseudo-Phong-shaded textured triangle, with perspective correction.
    template<typename tc, typename tl>
    CImg<T>& draw_triangle(const int x0, const int y0, const float z0,
                           const int x1, const int y1, const float z1,
                           const int x2, const int y2, const float z2,
                           const CImg<tc>& texture,
                           const int tx0, const int ty0,
                           const int tx1, const int ty1,
                           const int tx2, const int ty2,
                           const CImg<tl>& light,
                           const int lx0, const int ly0,
                           const int lx1, const int ly1,
                           const int lx2, const int ly2,
                           const float opacity=1) {
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
      if (light._depth>1 || light._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified light texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);

      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
      if (is_overlapped(texture)) return draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,+texture,tx0,ty0,tx1,ty1,tx2,ty2,light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
      if (is_overlapped(light)) return draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,texture,tx0,ty0,tx1,ty1,tx2,ty2,+light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const int whd = _width*_height*_depth, twhd = texture._width*texture._height*texture._depth, offx = _spectrum*whd-1;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
      float
        ntx0 = tx0/z0, nty0 = ty0/z0,
        ntx1 = tx1/z1, nty1 = ty1/z1,
        ntx2 = tx2/z2, nty2 = ty2/z2,
        nz0 = 1/z0, nz1 = 1/z1, nz2 = 1/z2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nlx0,nlx1,nly0,nly1,nz0,nz1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nlx0,nlx2,nly0,nly2,nz0,nz2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nlx1,nlx2,nly1,nly2,nz1,nz2);
      if (ny0>=height() || ny2<0) return *this;
      float
        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
        ptyl = (nty1 - nty0)/(ny1 - ny0),
        ptyr = (nty2 - nty0)/(ny2 - ny0),
        ptyn = (nty2 - nty1)/(ny2 - ny1),
        pzl = (nz1 - nz0)/(ny1 - ny0),
        pzr = (nz2 - nz0)/(ny2 - ny0),
        pzn = (nz2 - nz1)/(ny2 - ny1),
        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1))),
        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):(ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):(ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
      _cimg_for_triangle3(*this,xleft0,lxleft0,lyleft0,xright0,lxright0,lyright0,y,
                          nx0,ny0,nlx0,nly0,nx1,ny1,nlx1,nly1,nx2,ny2,nlx2,nly2) {
        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
        int
          xleft = xleft0, xright = xright0,
          lxleft = lxleft0, lxright = lxright0,
          lyleft = lyleft0, lyright = lyright0;
        float
          zleft = zl, zright = zr,
          txleft = txl, txright = txr,
          tyleft = tyl, tyright = tyr;
        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright,lxleft,lxright,lyleft,lyright);
        const int
          dx = xright - xleft,
          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
          rlx = dx?(lxright - lxleft)/dx:0,
          rly = dx?(lyright - lyleft)/dx:0,
          slx = lxright>lxleft?1:-1,
          sly = lyright>lyleft?1:-1,
          ndlx = dlx - (dx?dx*(dlx/dx):0),
          ndly = dly - (dx?dx*(dly/dx):0);
        const float
          pentez = (zright - zleft)/dx,
          pentetx = (txright - txleft)/dx,
          pentety = (tyright - tyleft)/dx;
        int errlx = dx>>1, errly = errlx;
        if (xleft<0 && dx) {
          zleft-=xleft*(zright - zleft)/dx;
          lxleft-=xleft*(lxright - lxleft)/dx;
          lyleft-=xleft*(lyright - lyleft)/dx;
          txleft-=xleft*(txright - txleft)/dx;
          tyleft-=xleft*(tyright - tyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T* ptrd = data(xleft,y,0,0);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x) {
          const float invz = 1/zleft;
          const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
          cimg_forC(*this,c) {
            const tl l = light(lxleft,lyleft,c);
            *ptrd = (T)(l<1?l**col:(2-l)**col+(l-1)*maxval);
            ptrd+=whd; col+=twhd;
          }
          ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
        } else for (int x = xleft; x<=xright; ++x) {
          const float invz = 1/zleft;
          const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
          cimg_forC(*this,c) {
            const tl l = light(lxleft,lyleft,c);
            const T val = (T)(l<1?l**col:(2-l)**col+(l-1)*maxval);
            *ptrd = (T)(nopacity*val + *ptrd*copacity);
            ptrd+=whd; col+=twhd;
          }
          ptrd-=offx; zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
          lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
          lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
        }
        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
      }
      return *this;
    }

    //! Draw a 2d Pseudo-Phong-shaded textured triangle, with z-buffering and perspective correction.
    template<typename tz, typename tc, typename tl>
    CImg<T>& draw_triangle(CImg<tz>& zbuffer,
                           const int x0, const int y0, const float z0,
                           const int x1, const int y1, const float z1,
                           const int x2, const int y2, const float z2,
                           const CImg<tc>& texture,
                           const int tx0, const int ty0,
                           const int tx1, const int ty1,
                           const int tx2, const int ty2,
                           const CImg<tl>& light,
                           const int lx0, const int ly0,
                           const int lx1, const int ly1,
                           const int lx2, const int ly2,
                           const float opacity=1) {
      typedef typename cimg::superset<tz,float>::type tzfloat;
      if (!is_sameXY(zbuffer))
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Instance and specified Z-buffer (%u,%u,%u,%u,%p) have different dimensions.",
                                    cimg_instance,
                                    zbuffer._width,zbuffer._height,zbuffer._depth,zbuffer._spectrum,zbuffer._data);
      if (texture._depth>1 || texture._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    texture._width,texture._height,texture._depth,texture._spectrum,texture._data);
      if (light._depth>1 || light._spectrum<_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_triangle() : Invalid specified light texture (%u,%u,%u,%u,%p).",
                                    cimg_instance,light._width,light._height,light._depth,light._spectrum,light._data);

      if (is_empty() || z0<=0 || z1<=0 || z2<=0) return *this;
      if (is_overlapped(texture)) return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,
                                                       +texture,tx0,ty0,tx1,ty1,tx2,ty2,light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
      if (is_overlapped(light)) return draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,
                                                     texture,tx0,ty0,tx1,ty1,tx2,ty2,+light,lx0,ly0,lx1,ly1,lx2,ly2,opacity);
      static const T maxval = (T)cimg::min(cimg::type<T>::max(),cimg::type<tc>::max());
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const int whd = _width*_height*_depth, twhd = texture._width*texture._height*texture._depth, offx = _spectrum*whd;
      int nx0 = x0, ny0 = y0, nx1 = x1, ny1 = y1, nx2 = x2, ny2 = y2,
        nlx0 = lx0, nly0 = ly0, nlx1 = lx1, nly1 = ly1, nlx2 = lx2, nly2 = ly2;
      float
        ntx0 = tx0/z0, nty0 = ty0/z0,
        ntx1 = tx1/z1, nty1 = ty1/z1,
        ntx2 = tx2/z2, nty2 = ty2/z2;
      tzfloat nz0 = 1/(tzfloat)z0, nz1 = 1/(tzfloat)z1, nz2 = 1/(tzfloat)z2;
      if (ny0>ny1) cimg::swap(nx0,nx1,ny0,ny1,ntx0,ntx1,nty0,nty1,nlx0,nlx1,nly0,nly1,nz0,nz1);
      if (ny0>ny2) cimg::swap(nx0,nx2,ny0,ny2,ntx0,ntx2,nty0,nty2,nlx0,nlx2,nly0,nly2,nz0,nz2);
      if (ny1>ny2) cimg::swap(nx1,nx2,ny1,ny2,ntx1,ntx2,nty1,nty2,nlx1,nlx2,nly1,nly2,nz1,nz2);
      if (ny0>=height() || ny2<0) return *this;
      float
        ptxl = (ntx1 - ntx0)/(ny1 - ny0),
        ptxr = (ntx2 - ntx0)/(ny2 - ny0),
        ptxn = (ntx2 - ntx1)/(ny2 - ny1),
        ptyl = (nty1 - nty0)/(ny1 - ny0),
        ptyr = (nty2 - nty0)/(ny2 - ny0),
        ptyn = (nty2 - nty1)/(ny2 - ny1),
        txr = ny0>=0?ntx0:(ntx0 - ny0*(ntx2 - ntx0)/(ny2 - ny0)),
        tyr = ny0>=0?nty0:(nty0 - ny0*(nty2 - nty0)/(ny2 - ny0)),
        txl = ny1>=0?(ny0>=0?ntx0:(ntx0 - ny0*(ntx1 - ntx0)/(ny1 - ny0))):(ptxl=ptxn,(ntx1 - ny1*(ntx2 - ntx1)/(ny2 - ny1))),
        tyl = ny1>=0?(ny0>=0?nty0:(nty0 - ny0*(nty1 - nty0)/(ny1 - ny0))):(ptyl=ptyn,(nty1 - ny1*(nty2 - nty1)/(ny2 - ny1)));
      tzfloat
        pzl = (nz1 - nz0)/(ny1 - ny0),
        pzr = (nz2 - nz0)/(ny2 - ny0),
        pzn = (nz2 - nz1)/(ny2 - ny1),
        zr = ny0>=0?nz0:(nz0 - ny0*(nz2 - nz0)/(ny2 - ny0)),
        zl = ny1>=0?(ny0>=0?nz0:(nz0 - ny0*(nz1 - nz0)/(ny1 - ny0))):(pzl=pzn,(nz1 - ny1*(nz2 - nz1)/(ny2 - ny1)));
      _cimg_for_triangle3(*this,xleft0,lxleft0,lyleft0,xright0,lxright0,lyright0,y,
                          nx0,ny0,nlx0,nly0,nx1,ny1,nlx1,nly1,nx2,ny2,nlx2,nly2) {
        if (y==ny1) { zl = nz1; txl = ntx1; tyl = nty1; pzl = pzn; ptxl = ptxn; ptyl = ptyn; }
        int
          xleft = xleft0, xright = xright0,
          lxleft = lxleft0, lxright = lxright0,
          lyleft = lyleft0, lyright = lyright0;
        float txleft = txl, txright = txr, tyleft = tyl, tyright = tyr;
        tzfloat zleft = zl, zright = zr;
        if (xright<xleft) cimg::swap(xleft,xright,zleft,zright,txleft,txright,tyleft,tyright,lxleft,lxright,lyleft,lyright);
        const int
          dx = xright - xleft,
          dlx = lxright>lxleft?lxright - lxleft:lxleft - lxright,
          dly = lyright>lyleft?lyright - lyleft:lyleft - lyright,
          rlx = dx?(lxright - lxleft)/dx:0,
          rly = dx?(lyright - lyleft)/dx:0,
          slx = lxright>lxleft?1:-1,
          sly = lyright>lyleft?1:-1,
          ndlx = dlx - (dx?dx*(dlx/dx):0),
          ndly = dly - (dx?dx*(dly/dx):0);
        float pentetx = (txright - txleft)/dx, pentety = (tyright - tyleft)/dx;
        const tzfloat pentez = (zright - zleft)/dx;
        int errlx = dx>>1, errly = errlx;
        if (xleft<0 && dx) {
          zleft-=xleft*(zright - zleft)/dx;
          lxleft-=xleft*(lxright - lxleft)/dx;
          lyleft-=xleft*(lyright - lyleft)/dx;
          txleft-=xleft*(txright - txleft)/dx;
          tyleft-=xleft*(tyright - tyleft)/dx;
        }
        if (xleft<0) xleft = 0;
        if (xright>=width()-1) xright = width()-1;
        T* ptrd = data(xleft,y);
        tz *ptrz = zbuffer.data(xleft,y);
        if (opacity>=1) for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
            if (zleft>=(tzfloat)*ptrz) {
              *ptrz = (tz)zleft;
              const tzfloat invz = 1/zleft;
              const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
              cimg_forC(*this,c) {
                const tl l = light(lxleft,lyleft,c);
                *ptrd = (T)(l<1?l**col:(2-l)**col+(l-1)*maxval);
                ptrd+=whd; col+=twhd;
              }
              ptrd-=offx;
            }
            zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
            lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
          } else for (int x = xleft; x<=xright; ++x, ++ptrz, ++ptrd) {
            if (zleft>=(tzfloat)*ptrz) {
              *ptrz = (tz)zleft;
              const tzfloat invz = 1/zleft;
              const tc *col = texture.data((int)(txleft*invz),(int)(tyleft*invz));
              cimg_forC(*this,c) {
                const tl l = light(lxleft,lyleft,c);
                const T val = (T)(l<1?l**col:(2-l)**col+(l-1)*maxval);
                *ptrd = (T)(nopacity*val + *ptrd*copacity);
                ptrd+=whd; col+=twhd;
              }
              ptrd-=offx;
            }
            zleft+=pentez; txleft+=pentetx; tyleft+=pentety;
            lxleft+=rlx+((errlx-=ndlx)<0?errlx+=dx,slx:0);
            lyleft+=rly+((errly-=ndly)<0?errly+=dx,sly:0);
          }
        zr+=pzr; txr+=ptxr; tyr+=ptyr; zl+=pzl; txl+=ptxl; tyl+=ptyl;
      }
      return *this;
    }

    //! Draw a 4d filled rectangle in the instance image, at coordinates (\c x0,\c y0,\c z0,\c c0)-(\c x1,\c y1,\c z1,\c c1).
    /**
       \param x0 X-coordinate of the upper-left rectangle corner.
       \param y0 Y-coordinate of the upper-left rectangle corner.
       \param z0 Z-coordinate of the upper-left rectangle corner.
       \param c0 C-coordinate of the upper-left rectangle corner.
       \param x1 X-coordinate of the lower-right rectangle corner.
       \param y1 Y-coordinate of the lower-right rectangle corner.
       \param z1 Z-coordinate of the lower-right rectangle corner.
       \param c1 C-coordinate of the lower-right rectangle corner.
       \param val Scalar value used to fill the rectangle area.
       \param opacity Drawing opacity (optional).
       \note
       - Clipping is supported.
    **/
    CImg<T>& draw_rectangle(const int x0, const int y0, const int z0, const int c0,
                            const int x1, const int y1, const int z1, const int c1,
                            const T val, const float opacity=1) {
      if (is_empty()) return *this;
      const bool bx = (x0<x1), by = (y0<y1), bz = (z0<z1), bc = (c0<c1);
      const int
        nx0 = bx?x0:x1, nx1 = bx?x1:x0,
        ny0 = by?y0:y1, ny1 = by?y1:y0,
        nz0 = bz?z0:z1, nz1 = bz?z1:z0,
        nc0 = bc?c0:c1, nc1 = bc?c1:c0;
      const int
        lX = (1 + nx1 - nx0) + (nx1>=width()?width() - 1 - nx1:0) + (nx0<0?nx0:0),
        lY = (1 + ny1 - ny0) + (ny1>=height()?height() - 1 - ny1:0) + (ny0<0?ny0:0),
        lZ = (1 + nz1 - nz0) + (nz1>=depth()?depth() - 1 - nz1:0) + (nz0<0?nz0:0),
        lC = (1 + nc1 - nc0) + (nc1>=spectrum()?spectrum() - 1 - nc1:0) + (nc0<0?nc0:0);
      const unsigned int offX = _width - lX, offY = _width*(_height - lY), offZ = _width*_height*(_depth - lZ);
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      T *ptrd = data(nx0<0?0:nx0,ny0<0?0:ny0,nz0<0?0:nz0,nc0<0?0:nc0);
      if (lX>0 && lY>0 && lZ>0 && lC>0)
        for (int v = 0; v<lC; ++v) {
          for (int z = 0; z<lZ; ++z) {
            for (int y = 0; y<lY; ++y) {
              if (opacity>=1) {
                if (sizeof(T)!=1) { for (int x = 0; x<lX; ++x) *(ptrd++) = val; ptrd+=offX; }
                else { std::memset(ptrd,(int)val,lX); ptrd+=_width; }
              } else { for (int x = 0; x<lX; ++x) { *ptrd = (T)(nopacity*val + *ptrd*copacity); ++ptrd; } ptrd+=offX; }
            }
            ptrd+=offY;
          }
          ptrd+=offZ;
        }
      return *this;
    }

    //! Draw a 3d filled colored rectangle in the instance image, at coordinates (\c x0,\c y0,\c z0)-(\c x1,\c y1,\c z1).
    /**
       \param x0 X-coordinate of the upper-left rectangle corner.
       \param y0 Y-coordinate of the upper-left rectangle corner.
       \param z0 Z-coordinate of the upper-left rectangle corner.
       \param x1 X-coordinate of the lower-right rectangle corner.
       \param y1 Y-coordinate of the lower-right rectangle corner.
       \param z1 Z-coordinate of the lower-right rectangle corner.
       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
       \param opacity Drawing opacity (optional).
       \note
       - Clipping is supported.
    **/
    template<typename tc>
    CImg<T>& draw_rectangle(const int x0, const int y0, const int z0,
                            const int x1, const int y1, const int z1,
                            const tc *const color, const float opacity=1) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_rectangle : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      cimg_forC(*this,c) draw_rectangle(x0,y0,z0,c,x1,y1,z1,c,color[c],opacity);
      return *this;
    }

    //! Draw a 3d outlined colored rectangle in the instance image.
    template<typename tc>
    CImg<T>& draw_rectangle(const int x0, const int y0, const int z0,
                            const int x1, const int y1, const int z1,
                            const tc *const color, const float opacity,
                            const unsigned int pattern) {
      return draw_line(x0,y0,z0,x1,y0,z0,color,opacity,pattern,true).
        draw_line(x1,y0,z0,x1,y1,z0,color,opacity,pattern,false).
        draw_line(x1,y1,z0,x0,y1,z0,color,opacity,pattern,false).
        draw_line(x0,y1,z0,x0,y0,z0,color,opacity,pattern,false).
        draw_line(x0,y0,z1,x1,y0,z1,color,opacity,pattern,true).
        draw_line(x1,y0,z1,x1,y1,z1,color,opacity,pattern,false).
        draw_line(x1,y1,z1,x0,y1,z1,color,opacity,pattern,false).
        draw_line(x0,y1,z1,x0,y0,z1,color,opacity,pattern,false).
        draw_line(x0,y0,z0,x0,y0,z1,color,opacity,pattern,true).
        draw_line(x1,y0,z0,x1,y0,z1,color,opacity,pattern,true).
        draw_line(x1,y1,z0,x1,y1,z1,color,opacity,pattern,true).
        draw_line(x0,y1,z0,x0,y1,z1,color,opacity,pattern,true);
    }

    //! Draw a 2d filled colored rectangle in the instance image, at coordinates (\c x0,\c y0)-(\c x1,\c y1).
    /**
       \param x0 X-coordinate of the upper-left rectangle corner.
       \param y0 Y-coordinate of the upper-left rectangle corner.
       \param x1 X-coordinate of the lower-right rectangle corner.
       \param y1 Y-coordinate of the lower-right rectangle corner.
       \param color Pointer to \c spectrum() consecutive values of type \c T, defining the drawing color.
       \param opacity Drawing opacity (optional).
       \note
       - Clipping is supported.
    **/
    template<typename tc>
    CImg<T>& draw_rectangle(const int x0, const int y0,
                            const int x1, const int y1,
                            const tc *const color, const float opacity=1) {
      return draw_rectangle(x0,y0,0,x1,y1,_depth-1,color,opacity);
    }

    //! Draw a 2d outlined colored rectangle.
    template<typename tc>
    CImg<T>& draw_rectangle(const int x0, const int y0,
                            const int x1, const int y1,
                            const tc *const color, const float opacity,
                            const unsigned int pattern) {
      if (is_empty()) return *this;
      if (y0==y1) return draw_line(x0,y0,x1,y0,color,opacity,pattern,true);
      if (x0==x1) return draw_line(x0,y0,x0,y1,color,opacity,pattern,true);
      const bool bx = (x0<x1), by = (y0<y1);
      const int
        nx0 = bx?x0:x1, nx1 = bx?x1:x0,
        ny0 = by?y0:y1, ny1 = by?y1:y0;
      if (ny1==ny0+1) return draw_line(nx0,ny0,nx1,ny0,color,opacity,pattern,true).
                      draw_line(nx1,ny1,nx0,ny1,color,opacity,pattern,false);
      return draw_line(nx0,ny0,nx1,ny0,color,opacity,pattern,true).
        draw_line(nx1,ny0+1,nx1,ny1-1,color,opacity,pattern,false).
        draw_line(nx1,ny1,nx0,ny1,color,opacity,pattern,false).
        draw_line(nx0,ny1-1,nx0,ny0+1,color,opacity,pattern,false);
    }

    //! Draw a filled polygon in the instance image.
    template<typename t, typename tc>
    CImg<T>& draw_polygon(const CImg<t>& points,
                          const tc *const color, const float opacity=1) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_polygon() : Specified color is (null).",
                                    cimg_instance);

      if (is_empty() || !points || points._width<3) return *this;

      // Normalize 2d input coordinates.
      CImg<intT> npoints(points._width,2);
      int x = npoints(0,0) = (int)points(0,0), y = npoints(0,1) = (int)points(0,1);
      unsigned int nb_points = 1;
      for (unsigned int p = 1; p<points._width; ++p) {
        const int nx = (int)points(p,0), ny = (int)points(p,1);
        if (nx!=x || ny!=y) { npoints(nb_points,0) = nx; npoints(nb_points++,1) = ny; x = nx; y = ny; }
      }

      if (nb_points==3) return draw_triangle((int)npoints(0,0),(int)npoints(0,1),
                                             (int)npoints(1,0),(int)npoints(1,1),
                                             (int)npoints(2,0),(int)npoints(2,1),color,opacity);
      // Draw polygon segments.
      _draw_scanline(color,opacity);
      int
        xmax = 0, xmin = (int)npoints.get_shared_points(0,nb_points-1,0).min_max(xmax),
        ymax = 0, ymin = (int)npoints.get_shared_points(0,nb_points-1,1).min_max(ymax);
      if (xmax<0 || xmin>=width() || ymax<0 || ymin>=height()) return *this;
      if (ymin==ymax) return _draw_scanline(xmin,xmax,ymin,color,opacity);
      const unsigned int
        nymin = ymin<0?0:(unsigned int)ymin,
        nymax = ymax>=height()?_height-1:(unsigned int)ymax,
        dy = 1 + nymax - nymin;
      CImg<intT> X(1+2*nb_points,dy,1,1,0), tmp;
      int cx = (int)npoints(0,0), cy = (int)npoints(0,1);
      unsigned int cp = 0;
      for (unsigned int p = 0; p<nb_points; ++p) {
        const unsigned int np = (p!=nb_points-1)?p+1:0, ap = (np!=nb_points-1)?np+1:0;
        const int
          nx = (int)npoints(np,0), ny = (int)npoints(np,1), ay = (int)npoints(ap,1),
          y0 = cy - nymin, y1 = ny - nymin;
        if (y0!=y1) {
          const int countermin = ((ny<ay && cy<ny) || (ny>ay && cy>ny))?1:0;
          for (int x = cx, y = y0, _sx = 1, _sy = 1,
                 _dx = nx>cx?nx-cx:((_sx=-1),cx-nx),
                 _dy = y1>y0?y1-y0:((_sy=-1),y0-y1),
                 _counter = ((_dx-=_dy?_dy*(_dx/_dy):0),_dy),
                 _err = _dx>>1,
                 _rx = _dy?(nx-cx)/_dy:0;
               _counter>=countermin;
               --_counter, y+=_sy, x+=_rx + ((_err-=_dx)<0?_err+=_dy,_sx:0))
            if (y>=0 && y<(int)dy) X(++X(0,y),y) = x;
          cp = np; cx = nx; cy = ny;
        } else {
          const int pp = (cp?cp-1:nb_points-1), py = (int)npoints(pp,1);
          if (y0>=0 && y0<(int)dy && (!p || (cy>py && ay>cy) || (cy<py && ay<cy))) X(++X(0,y0),y0) = nx;
          if (cy!=ay) { cp = np; cx = nx; cy = ny; }
        }
      }

      // Draw polygon scanlines.
      for (int y = 0; y<(int)dy; ++y) {
        tmp.assign(X.data(1,y),X(0,y),1,1,1,true).sort();
        for (int i = 1; i<=X(0,y); ) {
          const int xb = X(i++,y), xe = X(i++,y);
          _draw_scanline(xb,xe,nymin+y,color,opacity);
        }
      }

      return *this;
    }

    //! Draw a outlined polygon in the instance image.
    template<typename t, typename tc>
    CImg<T>& draw_polygon(const CImg<t>& points,
                          const tc *const color, const float opacity, const unsigned int pattern) {
      if (is_empty() || !points || points._width<3) return *this;
      bool ninit_hatch = true;
      switch (points._height) {
      case 0 : case 1 :
        throw CImgArgumentException(_cimg_instance
                                    "draw_polygon() : Invalid specified point set.",
                                    cimg_instance);
      case 2 : { // 2d version.
        CImg<intT> npoints(points._width,2);
        int x = npoints(0,0) = (int)points(0,0), y = npoints(0,1) = (int)points(0,1);
        unsigned int nb_points = 1;
        for (unsigned int p = 1; p<points._width; ++p) {
          const int nx = (int)points(p,0), ny = (int)points(p,1);
          if (nx!=x || ny!=y) { npoints(nb_points,0) = nx; npoints(nb_points++,1) = ny; x = nx; y = ny; }
        }
        const int x0 = (int)npoints(0,0), y0 = (int)npoints(0,1);
        int ox = x0, oy = y0;
        for (unsigned int i = 1; i<nb_points; ++i) {
          const int x = (int)npoints(i,0), y = (int)npoints(i,1);
          draw_line(ox,oy,x,y,color,opacity,pattern,ninit_hatch);
          ninit_hatch = false;
          ox = x; oy = y;
        }
        draw_line(ox,oy,x0,y0,color,opacity,pattern,false);
      } break;
      default : { // 3d version.
        CImg<intT> npoints(points._width,3);
        int x = npoints(0,0) = (int)points(0,0), y = npoints(0,1) = (int)points(0,1), z = npoints(0,2) = (int)points(0,2);
        unsigned int nb_points = 1;
        for (unsigned int p = 1; p<points._width; ++p) {
          const int nx = (int)points(p,0), ny = (int)points(p,1), nz = (int)points(p,2);
          if (nx!=x || ny!=y || nz!=z) { npoints(nb_points,0) = nx; npoints(nb_points,1) = ny; npoints(nb_points++,2) = nz; x = nx; y = ny; z = nz; }
        }
        const int x0 = (int)npoints(0,0), y0 = (int)npoints(0,1), z0 = (int)npoints(0,2);
        int ox = x0, oy = y0, oz = z0;
        for (unsigned int i = 1; i<nb_points; ++i) {
          const int x = (int)npoints(i,0), y = (int)npoints(i,1), z = (int)npoints(i,2);
          draw_line(ox,oy,oz,x,y,z,color,opacity,pattern,ninit_hatch);
          ninit_hatch = false;
          ox = x; oy = y; oz = z;
        }
        draw_line(ox,oy,oz,x0,y0,z0,color,opacity,pattern,false);
      }
      }
      return *this;
    }

    //! Draw a filled circle.
    /**
       \param x0 X-coordinate of the circle center.
       \param y0 Y-coordinate of the circle center.
       \param radius  Circle radius.
       \param color Array of spectrum() values of type \c T, defining the drawing color.
       \param opacity Drawing opacity.
       \note
       - Circle version of the Bresenham's algorithm is used.
    **/
    template<typename tc>
    CImg<T>& draw_circle(const int x0, const int y0, int radius,
                         const tc *const color, const float opacity=1) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_circle : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      _draw_scanline(color,opacity);
      if (radius<0 || x0-radius>=width() || y0+radius<0 || y0-radius>=height()) return *this;
      if (y0>=0 && y0<height()) _draw_scanline(x0-radius,x0+radius,y0,color,opacity);
      for (int f = 1-radius, ddFx = 0, ddFy = -(radius<<1), x = 0, y = radius; x<y; ) {
        if (f>=0) {
          const int x1 = x0-x, x2 = x0+x, y1 = y0-y, y2 = y0+y;
          if (y1>=0 && y1<height()) _draw_scanline(x1,x2,y1,color,opacity);
          if (y2>=0 && y2<height()) _draw_scanline(x1,x2,y2,color,opacity);
          f+=(ddFy+=2); --y;
        }
        const bool no_diag = y!=(x++);
        ++(f+=(ddFx+=2));
        const int x1 = x0-y, x2 = x0+y, y1 = y0-x, y2 = y0+x;
        if (no_diag) {
          if (y1>=0 && y1<height()) _draw_scanline(x1,x2,y1,color,opacity);
          if (y2>=0 && y2<height()) _draw_scanline(x1,x2,y2,color,opacity);
        }
      }
      return *this;
    }

    //! Draw an outlined circle.
    /**
       \param x0 X-coordinate of the circle center.
       \param y0 Y-coordinate of the circle center.
       \param radius Circle radius.
       \param color Array of spectrum() values of type \c T, defining the drawing color.
       \param opacity Drawing opacity.
    **/
    template<typename tc>
    CImg<T>& draw_circle(const int x0, const int y0, int radius,
                         const tc *const color, const float opacity,
                         const unsigned int) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_circle : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      if (radius<0 || x0-radius>=width() || y0+radius<0 || y0-radius>=height()) return *this;
      if (!radius) return draw_point(x0,y0,color,opacity);
      draw_point(x0-radius,y0,color,opacity).draw_point(x0+radius,y0,color,opacity).
        draw_point(x0,y0-radius,color,opacity).draw_point(x0,y0+radius,color,opacity);
      if (radius==1) return *this;
      for (int f = 1-radius, ddFx = 0, ddFy = -(radius<<1), x = 0, y = radius; x<y; ) {
        if (f>=0) { f+=(ddFy+=2); --y; }
        ++x; ++(f+=(ddFx+=2));
        if (x!=y+1) {
          const int x1 = x0-y, x2 = x0+y, y1 = y0-x, y2 = y0+x, x3 = x0-x, x4 = x0+x, y3 = y0-y, y4 = y0+y;
          draw_point(x1,y1,color,opacity).draw_point(x1,y2,color,opacity).
            draw_point(x2,y1,color,opacity).draw_point(x2,y2,color,opacity);
          if (x!=y)
            draw_point(x3,y3,color,opacity).draw_point(x4,y4,color,opacity).
              draw_point(x4,y3,color,opacity).draw_point(x3,y4,color,opacity);
        }
      }
      return *this;
    }

    // Draw a 2d ellipse (inner routine).
    template<typename tc>
    CImg<T>& _draw_ellipse(const int x0, const int y0, const float r1, const float r2, const float angle,
                           const tc *const color, const float opacity,
                           const unsigned int pattern) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_ellipse : Specified color is (null).",
                                    cimg_instance);
      if (is_empty()) return *this;
      if (r1<=0 || r2<=0) return draw_point(x0,y0,color,opacity);
      _draw_scanline(color,opacity);
      const float
        nr1 = cimg::abs(r1), nr2 = cimg::abs(r2),
        nangle = (float)(angle*cimg::PI/180),
        u = (float)std::cos(nangle),
        v = (float)std::sin(nangle),
        rmax = cimg::max(nr1,nr2),
        l1 = (float)std::pow(rmax/(nr1>0?nr1:1e-6),2),
        l2 = (float)std::pow(rmax/(nr2>0?nr2:1e-6),2),
        a = l1*u*u + l2*v*v,
        b = u*v*(l1-l2),
        c = l1*v*v + l2*u*u;
      const int
        yb = (int)std::sqrt(a*rmax*rmax/(a*c - b*b)),
        tymin = y0 - yb - 1,
        tymax = y0 + yb + 1,
        ymin = tymin<0?0:tymin,
        ymax = tymax>=height()?_height-1:tymax;
      int oxmin = 0, oxmax = 0;
      bool first_line = true;
      for (int y = ymin; y<=ymax; ++y) {
        const float
          Y = y - y0 + (y<y0?0.5f:-0.5f),
          delta = b*b*Y*Y - a*(c*Y*Y - rmax*rmax),
          sdelta = delta>0?(float)std::sqrt(delta)/a:0.0f,
          bY = b*Y/a,
          fxmin = x0 - 0.5f - bY - sdelta,
          fxmax = x0 + 0.5f - bY + sdelta;
        const int xmin = (int)fxmin, xmax = (int)fxmax;
        if (!pattern) _draw_scanline(xmin,xmax,y,color,opacity);
        else {
          if (first_line) {
            if (y0-yb>=0) _draw_scanline(xmin,xmax,y,color,opacity);
            else draw_point(xmin,y,color,opacity).draw_point(xmax,y,color,opacity);
            first_line = false;
          } else {
            if (xmin<oxmin) _draw_scanline(xmin,oxmin-1,y,color,opacity);
            else _draw_scanline(oxmin+(oxmin==xmin?0:1),xmin,y,color,opacity);
            if (xmax<oxmax) _draw_scanline(xmax,oxmax-1,y,color,opacity);
            else _draw_scanline(oxmax+(oxmax==xmax?0:1),xmax,y,color,opacity);
            if (y==tymax) _draw_scanline(xmin+1,xmax-1,y,color,opacity);
          }
        }
        oxmin = xmin; oxmax = xmax;
      }
      return *this;
    }

    //! Draw a filled ellipse.
    /**
       \param x0 = X-coordinate of the ellipse center.
       \param y0 = Y-coordinate of the ellipse center.
       \param r1 = First radius of the ellipse.
       \param r2 = Second radius of the ellipse.
       \param angle = Angle of the first radius.
       \param color = array of spectrum() values of type \c T, defining the drawing color.
       \param opacity = opacity of the drawing.
    **/
    template<typename tc>
    CImg<T>& draw_ellipse(const int x0, const int y0, const float r1, const float r2, const float angle,
                          const tc *const color, const float opacity=1) {
      return _draw_ellipse(x0,y0,r1,r2,angle,color,opacity,0U);
    }

    //! Draw a filled ellipse.
    /**
       \param x0 = X-coordinate of the ellipse center.
       \param y0 = Y-coordinate of the ellipse center.
       \param tensor = Diffusion tensor describing the ellipse.
       \param color = array of spectrum() values of type \c T, defining the drawing color.
       \param opacity = opacity of the drawing.
    **/
    template<typename t, typename tc>
    CImg<T>& draw_ellipse(const int x0, const int y0, const CImg<t> &tensor,
                          const tc *const color, const float opacity=1) {
      CImgList<t> eig = tensor.get_symmetric_eigen();
      const CImg<t> &val = eig[0], &vec = eig[1];
      return draw_ellipse(x0,y0,std::sqrt(val(0)),std::sqrt(val(1)),
                          std::atan2(vec(0,1),vec(0,0))*180/cimg::PI,
                          color,opacity);
    }

    //! Draw an outlined ellipse.
    /**
       \param x0 = X-coordinate of the ellipse center.
       \param y0 = Y-coordinate of the ellipse center.
       \param r1 = First radius of the ellipse.
       \param r2 = Second radius of the ellipse.
       \param ru = X-coordinate of the orientation vector related to the first radius.
       \param rv = Y-coordinate of the orientation vector related to the first radius.
       \param color = array of spectrum() values of type \c T, defining the drawing color.
       \param pattern = If zero, the ellipse is filled, else pattern is an integer whose bits describe the outline pattern.
       \param opacity = opacity of the drawing.
    **/
    template<typename tc>
    CImg<T>& draw_ellipse(const int x0, const int y0, const float r1, const float r2, const float angle,
                          const tc *const color, const float opacity, const unsigned int pattern) {
      if (pattern) _draw_ellipse(x0,y0,r1,r2,angle,color,opacity,pattern);
      return *this;
    }

    //! Draw an outlined ellipse.
    /**
       \param x0 = X-coordinate of the ellipse center.
       \param y0 = Y-coordinate of the ellipse center.
       \param tensor = Diffusion tensor describing the ellipse.
       \param color = array of spectrum() values of type \c T, defining the drawing color.

       \param opacity = opacity of the drawing.
    **/
    template<typename t, typename tc>
    CImg<T>& draw_ellipse(const int x0, const int y0, const CImg<t> &tensor,
                          const tc *const color, const float opacity,
                          const unsigned int pattern) {
      CImgList<t> eig = tensor.get_symmetric_eigen();
      const CImg<t> &val = eig[0], &vec = eig[1];
      return draw_ellipse(x0,y0,std::sqrt(val(0)),std::sqrt(val(1)),
                          std::atan2(vec(0,1),vec(0,0))*180/cimg::PI,
                          color,opacity,pattern);
    }

    //! Draw an image.
    /**
       \param sprite Sprite image.
       \param x0 X-coordinate of the sprite position.
       \param y0 Y-coordinate of the sprite position.
       \param z0 Z-coordinate of the sprite position.
       \param c0 C-coordinate of the sprite position.
       \param opacity Drawing opacity (optional).
       \note
       - Clipping is supported.
    **/
    template<typename t>
    CImg<T>& draw_image(const int x0, const int y0, const int z0, const int c0,
                        const CImg<t>& sprite, const float opacity=1) {
      if (!sprite)
        throw CImgArgumentException(_cimg_instance
                                    "draw_image() : Empty specified sprite.",
                                    cimg_instance);
      if (is_empty()) return *this;
      if (is_overlapped(sprite)) return draw_image(x0,y0,z0,c0,+sprite,opacity);
      if (x0==0 && y0==0 && z0==0 && c0==0 && is_sameXYZC(sprite) && opacity>=1) return assign(sprite,false);
      const bool bx = (x0<0), by = (y0<0), bz = (z0<0), bc = (c0<0);
      const int
        lX = sprite.width() - (x0 + sprite.width()>width()?x0 + sprite.width() - width():0) + (bx?x0:0),
        lY = sprite.height() - (y0 + sprite.height()>height()?y0 + sprite.height() - height():0) + (by?y0:0),
        lZ = sprite.depth() - (z0 + sprite.depth()>depth()?z0 + sprite.depth() - depth():0) + (bz?z0:0),
        lC = sprite.spectrum() - (c0 + sprite.spectrum()>spectrum()?c0 + sprite.spectrum() - spectrum():0) + (bc?c0:0);
      const t
        *ptrs = sprite._data -
        (bx?x0:0) -
        (by?y0*sprite.width():0) -
        (bz?z0*sprite.width()*sprite.height():0) -
        (bc?c0*sprite.width()*sprite.height()*sprite.depth():0);
      const unsigned int
        offX = _width - lX, soffX = sprite._width - lX,
        offY = _width*(_height - lY), soffY = sprite._width*(sprite._height - lY),
        offZ = _width*_height*(_depth - lZ), soffZ = sprite._width*sprite._height*(sprite._depth - lZ);
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      if (lX>0 && lY>0 && lZ>0 && lC>0) {
        T *ptrd = data(x0<0?0:x0,y0<0?0:y0,z0<0?0:z0,c0<0?0:c0);
        for (int v = 0; v<lC; ++v) {
          for (int z = 0; z<lZ; ++z) {
            for (int y = 0; y<lY; ++y) {
              if (opacity>=1) for (int x = 0; x<lX; ++x) *(ptrd++) = (T)*(ptrs++);
              else for (int x = 0; x<lX; ++x) { *ptrd = (T)(nopacity*(*(ptrs++)) + *ptrd*copacity); ++ptrd; }
              ptrd+=offX; ptrs+=soffX;
            }
            ptrd+=offY; ptrs+=soffY;
          }
          ptrd+=offZ; ptrs+=soffZ;
        }
      }
      return *this;
    }

    // Optimized version (internal).
    CImg<T>& draw_image(const int x0, const int y0, const int z0, const int c0,
                        const CImg<T>& sprite, const float opacity=1) {
      if (!sprite)
        throw CImgArgumentException(_cimg_instance
                                    "draw_image() : Empty specified sprite.",
                                    cimg_instance);

      if (is_empty()) return *this;
      if (is_overlapped(sprite)) return draw_image(x0,y0,z0,c0,+sprite,opacity);
      if (x0==0 && y0==0 && z0==0 && c0==0 && is_sameXYZC(sprite) && opacity>=1) return assign(sprite,false);
      const bool bx = (x0<0), by = (y0<0), bz = (z0<0), bc = (c0<0);
      const int
        lX = sprite.width() - (x0 + sprite.width()>width()?x0 + sprite.width() - width():0) + (bx?x0:0),
        lY = sprite.height() - (y0 + sprite.height()>height()?y0 + sprite.height() - height():0) + (by?y0:0),
        lZ = sprite.depth() - (z0 + sprite.depth()>depth()?z0 + sprite.depth() - depth():0) + (bz?z0:0),
        lC = sprite.spectrum() - (c0 + sprite.spectrum()>spectrum()?c0 + sprite.spectrum() - spectrum():0) + (bc?c0:0);
      const T
        *ptrs = sprite._data -
        (bx?x0:0) -
        (by?y0*sprite.width():0) -
        (bz?z0*sprite.width()*sprite.height():0) -
        (bc?c0*sprite.width()*sprite.height()*sprite.depth():0);
      const unsigned int
        offX = _width - lX, soffX = sprite._width - lX,
        offY = _width*(_height - lY), soffY = sprite._width*(sprite._height - lY),
        offZ = _width*_height*(_depth - lZ), soffZ = sprite._width*sprite._height*(sprite._depth - lZ),
        slX = lX*sizeof(T);
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      if (lX>0 && lY>0 && lZ>0 && lC>0) {
        T *ptrd = data(x0<0?0:x0,y0<0?0:y0,z0<0?0:z0,c0<0?0:c0);
        for (int v = 0; v<lC; ++v) {
          for (int z = 0; z<lZ; ++z) {
            if (opacity>=1) for (int y = 0; y<lY; ++y) { std::memcpy(ptrd,ptrs,slX); ptrd+=_width; ptrs+=sprite._width; }
            else for (int y = 0; y<lY; ++y) {
              for (int x = 0; x<lX; ++x) { *ptrd = (T)(nopacity*(*(ptrs++)) + *ptrd*copacity); ++ptrd; }
              ptrd+=offX; ptrs+=soffX;
            }
            ptrd+=offY; ptrs+=soffY;
          }
          ptrd+=offZ; ptrs+=soffZ;
        }
      }
      return *this;
    }

    //! Draw an image.
    template<typename t>
    CImg<T>& draw_image(const int x0, const int y0, const int z0,
                        const CImg<t>& sprite, const float opacity=1) {
      return draw_image(x0,y0,z0,0,sprite,opacity);
    }

    //! Draw an image.
    template<typename t>
    CImg<T>& draw_image(const int x0, const int y0,
                        const CImg<t>& sprite, const float opacity=1) {
      return draw_image(x0,y0,0,sprite,opacity);
    }

    //! Draw an image.
    template<typename t>
    CImg<T>& draw_image(const int x0,
                        const CImg<t>& sprite, const float opacity=1) {
      return draw_image(x0,0,sprite,opacity);
    }

    //! Draw an image.
    template<typename t>
    CImg<T>& draw_image(const CImg<t>& sprite, const float opacity=1) {
      return draw_image(0,sprite,opacity);
    }

    //! Draw a sprite image in the instance image (masked version).
    /**
       \param sprite Sprite image.
       \param mask Mask image.
       \param x0 X-coordinate of the sprite position in the instance image.
       \param y0 Y-coordinate of the sprite position in the instance image.
       \param z0 Z-coordinate of the sprite position in the instance image.
       \param c0 C-coordinate of the sprite position in the instance image.
       \param mask_valmax Maximum pixel value of the mask image \c mask (optional).
       \param opacity Drawing opacity.
       \note
       - Pixel values of \c mask set the opacity of the corresponding pixels in \c sprite.
       - Clipping is supported.
       - Dimensions along x,y and z of \p sprite and \p mask must be the same.
    **/
    template<typename ti, typename tm>
    CImg<T>& draw_image(const int x0, const int y0, const int z0, const int c0,
                        const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
                        const float mask_valmax=1) {
      if (!sprite)
        throw CImgArgumentException(_cimg_instance
                                    "draw_image() : Empty specified sprite.",
                                    cimg_instance);
      if (!mask)
        throw CImgArgumentException(_cimg_instance
                                    "draw_image() : Empty specified mask.",
                                    cimg_instance);

      if (is_empty()) return *this;
      if (is_overlapped(sprite)) return draw_image(x0,y0,z0,c0,+sprite,mask,opacity,mask_valmax);
      if (is_overlapped(mask))   return draw_image(x0,y0,z0,c0,sprite,+mask,opacity,mask_valmax);
      if (mask._width!=sprite._width || mask._height!=sprite._height || mask._depth!=sprite._depth)
        throw CImgArgumentException(_cimg_instance
                                    "draw_image() : Sprite (%u,%u,%u,%u,%p) and mask (%u,%u,%u,%u,%p) have incompatible dimensions.",
                                    cimg_instance,
                                    sprite._width,sprite._height,sprite._depth,sprite._spectrum,sprite._data,
                                    mask._width,mask._height,mask._depth,mask._spectrum,mask._data);

      const bool bx = (x0<0), by = (y0<0), bz = (z0<0), bc = (c0<0);
      const int
        lX = sprite.width() - (x0 + sprite.width()>width()?x0 + sprite.width() - width():0) + (bx?x0:0),
        lY = sprite.height() - (y0 + sprite.height()>height()?y0 + sprite.height() - height():0) + (by?y0:0),
        lZ = sprite.depth() - (z0 + sprite.depth()>depth()?z0 + sprite.depth() - depth():0) + (bz?z0:0),
        lC = sprite.spectrum() - (c0 + sprite.spectrum()>spectrum()?c0 + sprite.spectrum() - spectrum():0) + (bc?c0:0);
      const int
        coff = -(bx?x0:0)-(by?y0*mask.width():0)-(bz?z0*mask.width()*mask.height():0)-(bc?c0*mask.width()*mask.height()*mask.depth():0),
        ssize = mask.width()*mask.height()*mask.depth();
      const ti *ptrs = sprite._data + coff;
      const tm *ptrm = mask._data   + coff;
      const unsigned int
        offX = _width - lX, soffX = sprite._width - lX,
        offY = _width*(_height - lY), soffY = sprite._width*(sprite._height - lY),
        offZ = _width*_height*(_depth - lZ), soffZ = sprite._width*sprite._height*(sprite._depth - lZ);
      if (lX>0 && lY>0 && lZ>0 && lC>0) {
        T *ptrd = data(x0<0?0:x0,y0<0?0:y0,z0<0?0:z0,c0<0?0:c0);
        for (int c = 0; c<lC; ++c) {
          ptrm = mask._data + (ptrm - mask._data)%ssize;
          for (int z = 0; z<lZ; ++z) {
            for (int y = 0; y<lY; ++y) {
              for (int x = 0; x<lX; ++x) {
                const float mopacity = (float)(*(ptrm++)*opacity),
                  nopacity = cimg::abs(mopacity), copacity = mask_valmax - cimg::max(mopacity,0);
                *ptrd = (T)((nopacity*(*(ptrs++)) + *ptrd*copacity)/mask_valmax);
                ++ptrd;
              }
              ptrd+=offX; ptrs+=soffX; ptrm+=soffX;
            }
            ptrd+=offY; ptrs+=soffY; ptrm+=soffY;
          }
          ptrd+=offZ; ptrs+=soffZ; ptrm+=soffZ;
        }
      }
      return *this;
    }

    //! Draw an image.
    template<typename ti, typename tm>
    CImg<T>& draw_image(const int x0, const int y0, const int z0,
                        const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
                        const float mask_valmax=1) {
      return draw_image(x0,y0,z0,0,sprite,mask,opacity,mask_valmax);
    }

    //! Draw an image.
    template<typename ti, typename tm>
    CImg<T>& draw_image(const int x0, const int y0,
                        const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
                        const float mask_valmax=1) {
      return draw_image(x0,y0,0,sprite,mask,opacity,mask_valmax);
    }

    //! Draw an image.
    template<typename ti, typename tm>
    CImg<T>& draw_image(const int x0,
                        const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
                        const float mask_valmax=1) {
      return draw_image(x0,0,sprite,mask,opacity,mask_valmax);
    }

    //! Draw an image.
    template<typename ti, typename tm>
    CImg<T>& draw_image(const CImg<ti>& sprite, const CImg<tm>& mask, const float opacity=1,
                        const float mask_valmax=1) {
      return draw_image(0,sprite,mask,opacity,mask_valmax);
    }

    //! Draw a text.
    /**
       \param x0 X-coordinate of the text in the instance image.
       \param y0 Y-coordinate of the text in the instance image.
       \param foreground_color Array of spectrum() values of type \c T, defining the foreground color (0 means 'transparent').
       \param background_color Array of spectrum() values of type \c T, defining the background color (0 means 'transparent').
       \param font Font used for drawing text.
       \param opacity Drawing opacity.
       \param format 'printf'-style format string, followed by arguments.
       \note Clipping is supported.
    **/
    template<typename tc1, typename tc2, typename t>
    CImg<T>& draw_text(const int x0, const int y0,
                       const char *const text,
                       const tc1 *const foreground_color, const tc2 *const background_color,
                       const float opacity, const CImgList<t>& font, ...) {
      if (!font) return *this;
      char tmp[2048] = { 0 }; std::va_list ap; va_start(ap,font);
      cimg_vsnprintf(tmp,sizeof(tmp),text,ap); va_end(ap);
      return _draw_text(x0,y0,tmp,foreground_color,background_color,opacity,font);
    }

    template<typename tc, typename t>
    CImg<T>& draw_text(const int x0, const int y0,
                       const char *const text,
                       const tc *const foreground_color, const int,
                       const float opacity, const CImgList<t>& font, ...) {
      if (!font) return *this;
      char tmp[2048] = { 0 }; std::va_list ap; va_start(ap,font);
      cimg_vsnprintf(tmp,sizeof(tmp),text,ap); va_end(ap);
      return _draw_text(x0,y0,tmp,foreground_color,(tc*)0,opacity,font);
    }

    template<typename tc, typename t>
    CImg<T>& draw_text(const int x0, const int y0,
                       const char *const text,
                       const int, const tc *const background_color,
                       const float opacity, const CImgList<t>& font, ...) {
      if (!font) return *this;
      char tmp[2048] = { 0 }; std::va_list ap; va_start(ap,font);
      cimg_vsnprintf(tmp,sizeof(tmp),text,ap); va_end(ap);
      return _draw_text(x0,y0,tmp,(tc*)0,background_color,opacity,font);
    }

    //! Draw a text.
    /**
       \param x0 X-coordinate of the text in the instance image.
       \param y0 Y-coordinate of the text in the instance image.
       \param foreground_color Array of spectrum() values of type \c T, defining the foreground color (0 means 'transparent').
       \param background_color Array of spectrum() values of type \c T, defining the background color (0 means 'transparent').
       \param font_size Size of the font (exact match for 13,24,32,57).
       \param opacity Drawing opacity.
       \param format 'printf'-style format string, followed by arguments.
       \note Clipping is supported.
    **/
    template<typename tc1, typename tc2>
    CImg<T>& draw_text(const int x0, const int y0,
                       const char *const text,
                       const tc1 *const foreground_color, const tc2 *const background_color,
                       const float opacity=1, const unsigned int font_height=13, ...) {
      if (!font_height) return *this;
      char tmp[2048] = { 0 }; std::va_list ap; va_start(ap,font_height); cimg_vsnprintf(tmp,sizeof(tmp),text,ap); va_end(ap);
      static CImgList<floatT> font;
      const unsigned int
        ref_height = font_height<=13?13:font_height<=28?24:font_height<=32?32:57,
        padding_x = font_height<=18?1:font_height<=32?2:3;
      if (!font || font[0]._height!=font_height) {
        font = CImgList<floatT>::font(ref_height,true);
        font[0].assign(1,font_height);
        if (ref_height==font_height) cimglist_for(font,l) font[l].resize(font[l]._width + padding_x,-100,-100,-100,0);
      }
      if (is_empty()) {
        if (font[0]._spectrum!=1) cimglist_for_in(font,0,255,l) font[l].channel(0);
      } else if (font[0]._spectrum<_spectrum) cimglist_for_in(font,0,255,l) font[l].resize(-100,-100,1,_spectrum);
      if (ref_height!=font_height) for (const char *ptrs = tmp; *ptrs; ++ptrs) {
          const unsigned int __c = (unsigned int)(unsigned char)*ptrs, _c = (__c=='\t')?' ':__c;
          if (_c<font._width) {
            CImg<floatT> &c = font[_c];
            if (c._height!=font_height) {
              c.resize(cimg::max(1U,c._width*font_height/c._height),font_height,-100,-100,c._height>font_height?2:3);
              c.resize(c._width + padding_x,-100,-100,-100,0);
            }
          }
          if (_c+256U<font._width) {
            CImg<floatT> &c = font[_c+256];
            if (c._height!=font_height) {
              c.resize(cimg::max(1U,c._width*font_height/c._height),font_height,-100,-100,c._height>font_height?2:3);
              c.resize(c._width + padding_x,-100,-100,-100,0);
            }
          }
        }
      return _draw_text(x0,y0,tmp,foreground_color,background_color,opacity,font);
    }

    template<typename tc>
    CImg<T>& draw_text(const int x0, const int y0,
                       const char *const text,
                       const tc *const foreground_color, const int background_color=0,
                       const float opacity=1, const unsigned int font_height=13, ...) {
      if (!font_height) return *this;
      char tmp[2048] = { 0 }; std::va_list ap; va_start(ap,font_height); cimg_vsnprintf(tmp,sizeof(tmp),text,ap); va_end(ap);
      return draw_text(x0,y0,"%s",foreground_color,(const tc*)background_color,opacity,font_height,tmp);
    }

    template<typename tc>
    CImg<T>& draw_text(const int x0, const int y0,
                       const char *const text,
                       const int, const tc *const background_color,
                       const float opacity=1, const unsigned int font_height=13, ...) {
      if (!font_height) return *this;
      char tmp[2048] = { 0 }; std::va_list ap; va_start(ap,font_height); cimg_vsnprintf(tmp,sizeof(tmp),text,ap); va_end(ap);
      return draw_text(x0,y0,"%s",(tc*)0,background_color,opacity,font_height,tmp);
    }

    // Draw a text (internal routine).
    template<typename tc1, typename tc2, typename t>
    CImg<T>& _draw_text(const int x0, const int y0,
                        const char *const text,
                        const tc1 *const foreground_color, const tc2 *const background_color,
                        const float opacity, const CImgList<t>& font) {
      if (!text) return *this;
      if (!font)
        throw CImgArgumentException(_cimg_instance
                                    "draw_text() : Empty specified font.",
                                    cimg_instance);
      const unsigned int text_length = std::strlen(text);
      if (is_empty()) {
        // If needed, pre-compute necessary size of the image
        int x = 0, y = 0, w = 0;
        unsigned char c = 0;
        for (unsigned int i = 0; i<text_length; ++i) {
          c = text[i];
          switch (c) {
          case '\n' : y+=font[0]._height; if (x>w) w = x; x = 0; break;
          case '\t' : x+=4*font[' ']._width; break;
          default : if (c<font._width) x+=font[c]._width;
          }
        }
        if (x!=0 || c=='\n') {
          if (x>w) w=x;
          y+=font[0]._height;
        }
        assign(x0+w,y0+y,1,font[0]._spectrum,0);
        if (background_color) cimg_forC(*this,c) get_shared_channel(c).fill((T)background_color[c]);
      }

      int x = x0, y = y0;
      CImg<t> letter;
      for (unsigned int i = 0; i<text_length; ++i) {
        const unsigned char c = text[i];
        switch (c) {
        case '\n' : y+=font[' ']._height; x = x0; break;
        case '\t' : x+=4*font[' ']._width; break;
        default : if (c<font._width) {
          letter = font[c];
          const unsigned int cmin = cimg::min(_spectrum,letter._spectrum);
          const CImg<t>& mask = (c+256)<(int)font._width?font[c+256]:font[c];
          if (foreground_color)
            for (unsigned int p = 0; p<letter._width*letter._height; ++p)
              if (mask(p)) for (unsigned int c = 0; c<cmin; ++c) letter(p,0,0,c) = (t)(letter(p,0,0,c)*foreground_color[c]);
          if (background_color)
            for (unsigned int p = 0; p<letter._width*letter._height; ++p)
              if (!mask(p)) for (unsigned int c = 0; c<cmin; ++c) letter(p,0,0,c) = (t)background_color[c];
          if (!background_color && font._width>=512) draw_image(x,y,letter,mask,opacity,(T)1);
          else draw_image(x,y,letter,opacity);
          x+=letter._width;
          }
        }
      }
      return *this;
    }

    //! Draw a vector field in the instance image, using a colormap.
    /**
       \param flow Image of 2d vectors used as input data.
       \param color Image of spectrum()-D vectors corresponding to the color of each arrow.
       \param sampling Length (in pixels) between each arrow.
       \param factor Length factor of each arrow (if <0, computed as a percentage of the maximum length).
       \param opacity Opacity of the drawing.
       \param pattern Used pattern to draw lines.
       \note Clipping is supported.
    **/
    template<typename t1, typename t2>
    CImg<T>& draw_quiver(const CImg<t1>& flow,
                         const t2 *const color, const float opacity=1,
                         const unsigned int sampling=25, const float factor=-20,
                         const bool arrows=true, const unsigned int pattern=~0U) {
      return draw_quiver(flow,CImg<t2>(color,_spectrum,1,1,1,true),opacity,sampling,factor,arrows,pattern);
    }

    //! Draw a vector field in the instance image, using a colormap.
    /**
       \param flow Image of 2d vectors used as input data.
       \param color Image of spectrum()-D vectors corresponding to the color of each arrow.
       \param sampling Length (in pixels) between each arrow.
       \param factor Length factor of each arrow (if <0, computed as a percentage of the maximum length).
       \param opacity Opacity of the drawing.
       \param pattern Used pattern to draw lines.
       \note Clipping is supported.
    **/
    template<typename t1, typename t2>
    CImg<T>& draw_quiver(const CImg<t1>& flow,
                         const CImg<t2>& color, const float opacity=1,
                         const unsigned int sampling=25, const float factor=-20,
                         const bool arrows=true, const unsigned int pattern=~0U) {

      if (is_empty()) return *this;

      if (!flow || flow._spectrum!=2)
        throw CImgArgumentException(_cimg_instance
                                    "draw_quiver() : Invalid dimensions of specified flow (%u,%u,%u,%u,%p).",
                                    cimg_instance,
                                    flow._width,flow._height,flow._depth,flow._spectrum,flow._data);
      if (sampling<=0)
        throw CImgArgumentException(_cimg_instance
                                    "draw_quiver() : Invalid sampling value %g "
                                    "(should be >0)",
                                    cimg_instance,
                                    sampling);

      const bool colorfield = (color._width==flow._width && color._height==flow._height && color._depth==1 && color._spectrum==_spectrum);
      if (is_overlapped(flow)) return draw_quiver(+flow,color,opacity,sampling,factor,arrows,pattern);

      float vmax,fact;
      if (factor<=0) {
        float m, M = (float)flow.get_norm(2).max_min(m);
        vmax = (float)cimg::max(cimg::abs(m),cimg::abs(M));
        if (!vmax) vmax = 1;
        fact = -factor;
      } else { fact = factor; vmax = 1; }

      for (unsigned int y = sampling/2; y<_height; y+=sampling)
        for (unsigned int x = sampling/2; x<_width; x+=sampling) {
          const unsigned int X = x*flow._width/_width, Y = y*flow._height/_height;
          float u = (float)flow(X,Y,0,0)*fact/vmax, v = (float)flow(X,Y,0,1)*fact/vmax;
          if (arrows) {
            const int xx = x+(int)u, yy = y+(int)v;
            if (colorfield) draw_arrow(x,y,xx,yy,color.get_vector_at(X,Y)._data,opacity,45,sampling/5.0f,pattern);
            else draw_arrow(x,y,xx,yy,color._data,opacity,45,sampling/5.0f,pattern);
          } else {
            if (colorfield) draw_line((int)(x-0.5*u),(int)(y-0.5*v),(int)(x+0.5*u),(int)(y+0.5*v),color.get_vector_at(X,Y)._data,opacity,pattern);
            else draw_line((int)(x-0.5*u),(int)(y-0.5*v),(int)(x+0.5*u),(int)(y+0.5*v),color._data,opacity,pattern);
          }
        }

      return *this;
    }

    //! Draw a labeled horizontal axis on the instance image.
    /**
       \param xvalues Lower bound of the x-range.
       \param y Y-coordinate of the horizontal axis in the instance image.
       \param color Array of spectrum() values of type \c T, defining the drawing color.
       \param opacity Drawing opacity.
       \param pattern Drawing pattern.
       \param opacity_out Drawing opacity of 'outside' axes.
       \note if \c precision==0, precision of the labels is automatically computed.
    **/
    template<typename t, typename tc>
    CImg<T>& draw_axis(const CImg<t>& xvalues, const int y,
                       const tc *const color, const float opacity=1,
                       const unsigned int pattern=~0U) {
      if (!is_empty()) {
        int siz = (int)xvalues.size()-1;
        if (siz<=0) draw_line(0,y,_width-1,y,color,opacity,pattern);
        else {
          if (xvalues[0]<xvalues[siz]) draw_arrow(0,y,_width-1,y,color,opacity,30,5,pattern);
          else draw_arrow(_width-1,y,0,y,color,opacity,30,5,pattern);
          const int yt = (y+14)<height()?(y+3):(y-14);
          char txt[32] = { 0 };
          cimg_foroff(xvalues,x) {
            cimg_snprintf(txt,sizeof(txt),"%g",(double)xvalues(x));
            const int xi = (int)(x*(_width-1)/siz), xt = xi - (int)std::strlen(txt)*3;
            draw_point(xi,y-1,color,opacity).draw_point(xi,y+1,color,opacity).
              draw_text(xt<0?0:xt,yt,txt,color,(tc*)0,opacity,13);
          }
        }
      }
      return *this;
    }

    //! Draw a labeled vertical axis on the instance image.
    template<typename t, typename tc>
    CImg<T>& draw_axis(const int x, const CImg<t>& yvalues,
                       const tc *const color, const float opacity=1,
                       const unsigned int pattern=~0U) {
      if (!is_empty()) {
        int siz = (int)yvalues.size()-1;
        if (siz<=0) draw_line(x,0,x,_height-1,color,opacity,pattern);
        else {
          if (yvalues[0]<yvalues[siz]) draw_arrow(x,0,x,_height-1,color,opacity,30,5,pattern);
          else draw_arrow(x,_height-1,x,0,color,opacity,30,5,pattern);
          char txt[32] = { 0 };
          cimg_foroff(yvalues,y) {
            cimg_snprintf(txt,sizeof(txt),"%g",(double)yvalues(y));
            const int
              yi = (int)(y*(_height-1)/siz),
              tmp = yi - 5,
              nyi = tmp<0?0:(tmp>=height()-11?height()-11:tmp),
              xt = x - (int)std::strlen(txt)*7;
            draw_point(x-1,yi,color,opacity).draw_point(x+1,yi,color,opacity);
            if (xt>0) draw_text(xt,nyi,txt,color,(tc*)0,opacity,13);
            else draw_text(x+3,nyi,txt,color,(tc*)0,opacity,13);
          }
        }
      }
      return *this;
    }

    //! Draw a labeled horizontal+vertical axis on the instance image.
    template<typename tx, typename ty, typename tc>
      CImg<T>& draw_axes(const CImg<tx>& xvalues, const CImg<ty>& yvalues,
                         const tc *const color, const float opacity=1,
                         const unsigned int patternx=~0U, const unsigned int patterny=~0U) {
      if (!is_empty()) {
        const CImg<tx> nxvalues(xvalues._data,xvalues.size(),1,1,1,true);
        const int sizx = (int)xvalues.size()-1, wm1 = width()-1;
        if (sizx>0) {
          float ox = (float)nxvalues[0];
          for (unsigned int x = 1; x<_width; ++x) {
            const float nx = (float)nxvalues._linear_atX((float)x*sizx/wm1);
            if (nx*ox<=0) { draw_axis(nx==0?x:x-1,yvalues,color,opacity,patterny); break; }
            ox = nx;
          }
        }
        const CImg<ty> nyvalues(yvalues._data,yvalues.size(),1,1,1,true);
        const int sizy = (int)yvalues.size()-1, hm1 = height()-1;
        if (sizy>0) {
          float oy = (float)nyvalues[0];
          for (unsigned int y = 1; y<_height; ++y) {
            const float ny = (float)nyvalues._linear_atX((float)y*sizy/hm1);
            if (ny*oy<=0) { draw_axis(xvalues,ny==0?y:y-1,color,opacity,patternx); break; }
            oy = ny;
          }
        }
      }
      return *this;
    }

    //! Draw a labeled horizontal+vertical axis on the instance image.
    template<typename tc>
    CImg<T>& draw_axes(const float x0, const float x1, const float y0, const float y1,
                       const tc *const color, const float opacity=1,
                       const int subdivisionx=-60, const int subdivisiony=-60,
                       const float precisionx=0, const float precisiony=0,
                       const unsigned int patternx=~0U, const unsigned int patterny=~0U) {
      if (!is_empty()) {
        const float
          dx = cimg::abs(x1-x0), dy = cimg::abs(y1-y0),
          px = (precisionx==0)?(float)std::pow(10.0,(int)std::log10(dx)-2.0):precisionx,
          py = (precisiony==0)?(float)std::pow(10.0,(int)std::log10(dy)-2.0):precisiony;
        if (x0!=x1 && y0!=y1)
          draw_axes(CImg<floatT>::sequence(subdivisionx>0?subdivisionx:1-width()/subdivisionx,x0,x1).round(px),
                    CImg<floatT>::sequence(subdivisiony>0?subdivisiony:1-height()/subdivisiony,y0,y1).round(py),
                    color,opacity,patternx,patterny);
        else if (x0==x1 && y0!=y1)
          draw_axis((int)x0,CImg<floatT>::sequence(subdivisiony>0?subdivisiony:1-height()/subdivisiony,y0,y1).round(py),
                    color,opacity,patterny);
        else if (x0!=x1 && y0==y1)
          draw_axis(CImg<floatT>::sequence(subdivisionx>0?subdivisionx:1-width()/subdivisionx,x0,x1).round(px),(int)y0,
                    color,opacity,patternx);
      }
      return *this;
    }

    //! Draw grid.
    template<typename tx, typename ty, typename tc>
    CImg<T>& draw_grid(const CImg<tx>& xvalues, const CImg<ty>& yvalues,
                       const tc *const color, const float opacity=1,
                       const unsigned int patternx=~0U, const unsigned int patterny=~0U) {
      if (!is_empty()) {
        if (xvalues) cimg_foroff(xvalues,x) {
          const int xi = (int)xvalues[x];
          if (xi>=0 && xi<width()) draw_line(xi,0,xi,_height-1,color,opacity,patternx);
        }
        if (yvalues) cimg_foroff(yvalues,y) {
          const int yi = (int)yvalues[y];
          if (yi>=0 && yi<height()) draw_line(0,yi,_width-1,yi,color,opacity,patterny);
        }
      }
      return *this;
    }

    //! Draw grid.
    template<typename tc>
    CImg<T>& draw_grid(const float deltax,  const float deltay,
                       const float offsetx, const float offsety,
                       const bool invertx, const bool inverty,
                       const tc *const color, const float opacity=1,
                       const unsigned int patternx=~0U, const unsigned int patterny=~0U) {
      CImg<uintT> seqx, seqy;
      if (deltax!=0) {
        const float dx = deltax>0?deltax:_width*-deltax/100;
        const unsigned int nx = (unsigned int)(_width/dx);
        seqx = CImg<uintT>::sequence(1+nx,0,(unsigned int)(dx*nx));
        if (offsetx) cimg_foroff(seqx,x) seqx(x) = (unsigned int)cimg::mod(seqx(x)+offsetx,(float)_width);
        if (invertx) cimg_foroff(seqx,x) seqx(x) = _width - 1 - seqx(x);
      }

      if (deltay!=0) {
        const float dy = deltay>0?deltay:_height*-deltay/100;
        const unsigned int ny = (unsigned int)(_height/dy);
        seqy = CImg<uintT>::sequence(1+ny,0,(unsigned int)(dy*ny));
        if (offsety) cimg_foroff(seqy,y) seqy(y) = (unsigned int)cimg::mod(seqy(y)+offsety,(float)_height);
        if (inverty) cimg_foroff(seqy,y) seqy(y) = _height - 1 - seqy(y);
     }
      return draw_grid(seqx,seqy,color,opacity,patternx,patterny);
    }

    //! Draw a 1d graph on the instance image.
    /**
       \param data Image containing the graph values I = f(x).
       \param color Array of spectrum() values of type \c T, defining the drawing color.
       \param opacity Drawing opacity.

       \param plot_type Define the type of the plot :
                      - 0 = No plot.
                      - 1 = Plot using segments.
                      - 2 = Plot using cubic splines.
                      - 3 = Plot with bars.
       \param vertex_type Define the type of points :
                      - 0 = No points.
                      - 1 = Point.
                      - 2 = Straight cross.
                      - 3 = Diagonal cross.
                      - 4 = Filled circle.
                      - 5 = Outlined circle.
                      - 6 = Square.
                      - 7 = Diamond.
       \param ymin Lower bound of the y-range.
       \param ymax Upper bound of the y-range.
       \param pattern Drawing pattern.
       \note
         - if \c ymin==ymax==0, the y-range is computed automatically from the input samples.
    **/
    template<typename t, typename tc>
    CImg<T>& draw_graph(const CImg<t>& data,
                        const tc *const color, const float opacity=1,
                        const unsigned int plot_type=1, const int vertex_type=1,
                        const double ymin=0, const double ymax=0, const unsigned int pattern=~0U) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_graph() : Specified color is (null).",
                                    cimg_instance);
      if (is_empty() || _height<=1) return *this;

      // Create shaded colors for displaying bar plots.
      CImg<tc> color1, color2;
      if (plot_type==3) {
        color1.assign(_spectrum); color2.assign(_spectrum);
        cimg_forC(*this,c) { color1[c] = (tc)cimg::min((float)cimg::type<tc>::max(),color[c]*1.2f); color2[c] = (tc)(color[c]*0.4f); }
      }

      // Compute min/max and normalization factors.
      const unsigned int
        siz = data.size(),
        _siz1 = siz - (plot_type!=3?1:0),
        siz1 = _siz1?_siz1:1,
        _width1 = _width - (plot_type!=3?1:0),
        width1 = _width1?_width1:1;
      double m = ymin, M = ymax;
      if (ymin==ymax) m = (double)data.max_min(M);
      if (m==M) { --m; ++M; }
      const float ca = (float)(M-m)/(_height-1);
      bool init_hatch = true;

      // Draw graph edges
      switch (plot_type%4) {
      case 1 : { // Segments
        int oX = 0, oY = (int)((data[0]-m)/ca);
        for (unsigned int off = 1; off<siz; ++off) {
          const int
            X = off*_width1/siz1,
            Y = (int)((data[off]-m)/ca);
          draw_line(oX,oY,X,Y,color,opacity,pattern,init_hatch);
          oX = X; oY = Y;
          init_hatch = false;
        }
      } break;
      case 2 : { // Spline
        const CImg<t> ndata(data._data,siz,1,1,1,true);
        int oY = (int)((data[0]-m)/ca);
        cimg_forX(*this,x) {
          const int Y = (int)((ndata._cubic_atX((float)x*siz1/width1)-m)/ca);
          if (x>0) draw_line(x,oY,x+1,Y,color,opacity,pattern,init_hatch);
          init_hatch = false;
          oY = Y;
        }
      } break;
      case 3 : { // Bars
        const int Y0 = (int)(-m/ca);
        int oX = 0;
        cimg_foroff(data,off) {
          const int
            X = (off+1)*_width/siz-1,
            Y = (int)((data[off]-m)/ca);
          draw_rectangle(oX,Y0,X,Y,color,opacity).
            draw_line(oX,Y,oX,Y0,color2.data(),opacity).
            draw_line(oX,Y0,X,Y0,Y<=Y0?color2.data():color1.data(),opacity).
            draw_line(X,Y,X,Y0,color1.data(),opacity).
            draw_line(oX,Y,X,Y,Y<=Y0?color1.data():color2.data(),opacity);
          oX = X+1;
        }
      } break;
      default : break; // No edges
      }

      // Draw graph points
      const unsigned int wb2 = plot_type==3?_width1/(2*siz):0;
      switch (vertex_type%8) {
      case 1 : { // Point
        cimg_foroff(data,off) {
          const int
            X = off*_width1/siz1 + wb2,
            Y = (int)((data[off]-m)/ca);
          draw_point(X,Y,color,opacity);
        }
      } break;
      case 2 : { // Straight Cross
        cimg_foroff(data,off) {
          const int
            X = off*_width1/siz1 + wb2,
            Y = (int)((data[off]-m)/ca);
          draw_line(X-3,Y,X+3,Y,color,opacity).draw_line(X,Y-3,X,Y+3,color,opacity);
        }
      } break;
      case 3 : { // Diagonal Cross
        cimg_foroff(data,off) {
          const int
            X = off*_width1/siz1 + wb2,
            Y = (int)((data[off]-m)/ca);
          draw_line(X-3,Y-3,X+3,Y+3,color,opacity).draw_line(X-3,Y+3,X+3,Y-3,color,opacity);
        }
      } break;
      case 4 : { // Filled Circle
        cimg_foroff(data,off) {
          const int
            X = off*_width1/siz1 + wb2,
            Y = (int)((data[off]-m)/ca);
          draw_circle(X,Y,3,color,opacity);
        }
      } break;
      case 5 : { // Outlined circle
        cimg_foroff(data,off) {
          const int
            X = off*_width1/siz1 + wb2,
            Y = (int)((data[off]-m)/ca);
          draw_circle(X,Y,3,color,opacity,0U);
        }
      } break;
      case 6 : { // Square
        cimg_foroff(data,off) {
          const int
            X = off*_width1/siz1 + wb2,
            Y = (int)((data[off]-m)/ca);
          draw_rectangle(X-3,Y-3,X+3,Y+3,color,opacity,~0U);
        }
      } break;
      case 7 : { // Diamond
        cimg_foroff(data,off) {
          const int
            X = off*_width1/siz1 + wb2,
            Y = (int)((data[off]-m)/ca);
          draw_line(X,Y-4,X+4,Y,color,opacity).
            draw_line(X+4,Y,X,Y+4,color,opacity).
            draw_line(X,Y+4,X-4,Y,color,opacity).
            draw_line(X-4,Y,X,Y-4,color,opacity);
        }
      } break;
      default : break; // No points
      }
      return *this;
    }

    //! Draw a 3d filled region starting from a point (\c x,\c y,\ z) in the instance image.
    /**
       \param x X-coordinate of the starting point of the region to fill.
       \param y Y-coordinate of the starting point of the region to fill.
       \param z Z-coordinate of the starting point of the region to fill.
       \param color An array of spectrum() values of type \c T, defining the drawing color.
       \param region Image that will contain the mask of the filled region mask, as an output.
       \param sigma Tolerance concerning neighborhood values.
       \param opacity Opacity of the drawing.
       \param high_connexity Tells if 8-connexity must be used (only for 2d images).
       \return \p region is initialized with the binary mask of the filled region.
    **/
    template<typename tc, typename t>
    CImg<T>& draw_fill(const int x, const int y, const int z,
                       const tc *const color, const float opacity,
                       CImg<t>& region, const float sigma=0,
                       const bool high_connexity=false) {

#define _cimg_draw_fill_test(x,y,z,res) if (region(x,y,z)) res = false; else { \
  res = true; \
  const T *reference_col = reference_color._data + _spectrum, *ptrs = data(x,y,z) + siz; \
  for (unsigned int i = _spectrum; res && i; --i) { ptrs-=whd; res = (cimg::abs(*ptrs - *(--reference_col))<=sigma); } \
  region(x,y,z) = (t)(res?1:noregion); \
}

#define _cimg_draw_fill_set(x,y,z) { \
  const tc *col = color; \
  T *ptrd = data(x,y,z); \
  if (opacity>=1) cimg_forC(*this,c) { *ptrd = (T)*(col++); ptrd+=whd; } \
  else cimg_forC(*this,c) { *ptrd = (T)(*(col++)*nopacity + *ptrd*copacity); ptrd+=whd; } \
}

#define _cimg_draw_fill_insert(x,y,z) { \
  if (posr1>=remaining._height) remaining.resize(3,remaining._height<<1,1,1,0); \
  unsigned int *ptrr = remaining.data(0,posr1); \
  *(ptrr++) = x; *(ptrr++) = y; *(ptrr++) = z; ++posr1; \
}

#define _cimg_draw_fill_test_neighbor(x,y,z,cond) if (cond) { \
  const unsigned int tx = x, ty = y, tz = z; \
  _cimg_draw_fill_test(tx,ty,tz,res); if (res) _cimg_draw_fill_insert(tx,ty,tz); \
}

      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_fill() : Specified color is (null).",
                                    cimg_instance);

      region.assign(_width,_height,_depth,1,(t)0);
      if (x>=0 && x<width() && y>=0 && y<height() && z>=0 && z<depth()) {
        const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
        const unsigned int whd = _width*_height*_depth, siz = _spectrum*whd, W1 = _width-1, H1 = _height-1, D1 = _depth-1;
        const bool is_3d = (_depth>1);
        const CImg<T> reference_color = get_vector_at(x,y,z);
        CImg<uintT> remaining(3,512,1,1,0);
        remaining(0,0) = x; remaining(1,0) = y; remaining(2,0) = z;
        unsigned int posr0 = 0, posr1 = 1;
        region(x,y,z) = (t)1;
        const t noregion = ((t)1==(t)2)?(t)0:(t)(-1);
        if (is_3d) do { // 3d version of the filling algorithm
          const unsigned int *pcurr = remaining.data(0,posr0++), xc = *(pcurr++), yc = *(pcurr++), zc = *(pcurr++);
          if (posr0>=512) { remaining.shift(0,-(int)posr0); posr1-=posr0; posr0 = 0; }
          bool cont, res;
          unsigned int nxc = xc;
          do { // X-backward
            _cimg_draw_fill_set(nxc,yc,zc);
            _cimg_draw_fill_test_neighbor(nxc,yc-1,zc,yc!=0);
            _cimg_draw_fill_test_neighbor(nxc,yc+1,zc,yc<H1);
            _cimg_draw_fill_test_neighbor(nxc,yc,zc-1,zc!=0);
            _cimg_draw_fill_test_neighbor(nxc,yc,zc+1,zc<D1);
            if (nxc) { --nxc; _cimg_draw_fill_test(nxc,yc,zc,cont); } else cont = false;
          } while (cont);
          nxc = xc;
          do { // X-forward
            if ((++nxc)<=W1) { _cimg_draw_fill_test(nxc,yc,zc,cont); } else cont = false;
            if (cont) {
              _cimg_draw_fill_set(nxc,yc,zc);
              _cimg_draw_fill_test_neighbor(nxc,yc-1,zc,yc!=0);
              _cimg_draw_fill_test_neighbor(nxc,yc+1,zc,yc<H1);
              _cimg_draw_fill_test_neighbor(nxc,yc,zc-1,zc!=0);
              _cimg_draw_fill_test_neighbor(nxc,yc,zc+1,zc<D1);
            }
          } while (cont);
          unsigned int nyc = yc;
          do { // Y-backward
            if (nyc) { --nyc; _cimg_draw_fill_test(xc,nyc,zc,cont); } else cont = false;
            if (cont) {
              _cimg_draw_fill_set(xc,nyc,zc);
              _cimg_draw_fill_test_neighbor(xc-1,nyc,zc,xc!=0);
              _cimg_draw_fill_test_neighbor(xc+1,nyc,zc,xc<W1);
              _cimg_draw_fill_test_neighbor(xc,nyc,zc-1,zc!=0);
              _cimg_draw_fill_test_neighbor(xc,nyc,zc+1,zc<D1);
            }
          } while (cont);
          nyc = yc;
          do { // Y-forward
            if ((++nyc)<=H1) { _cimg_draw_fill_test(xc,nyc,zc,cont); } else cont = false;
            if (cont) {
              _cimg_draw_fill_set(xc,nyc,zc);
              _cimg_draw_fill_test_neighbor(xc-1,nyc,zc,xc!=0);
              _cimg_draw_fill_test_neighbor(xc+1,nyc,zc,xc<W1);
              _cimg_draw_fill_test_neighbor(xc,nyc,zc-1,zc!=0);
              _cimg_draw_fill_test_neighbor(xc,nyc,zc+1,zc<D1);
            }
          } while (cont);
          unsigned int nzc = zc;
          do { // Z-backward
            if (nzc) { --nzc; _cimg_draw_fill_test(xc,yc,nzc,cont); } else cont = false;
            if (cont) {
              _cimg_draw_fill_set(xc,yc,nzc);
              _cimg_draw_fill_test_neighbor(xc-1,yc,nzc,xc!=0);
              _cimg_draw_fill_test_neighbor(xc+1,yc,nzc,xc<W1);
              _cimg_draw_fill_test_neighbor(xc,yc-1,nzc,yc!=0);
              _cimg_draw_fill_test_neighbor(xc,yc+1,nzc,yc<H1);
            }
          } while (cont);
          nzc = zc;
          do { // Z-forward
            if ((++nzc)<=D1) { _cimg_draw_fill_test(xc,yc,nzc,cont); } else cont = false;
            if (cont) {
              _cimg_draw_fill_set(xc,nyc,zc);
              _cimg_draw_fill_test_neighbor(xc-1,yc,nzc,xc!=0);
              _cimg_draw_fill_test_neighbor(xc+1,yc,nzc,xc<W1);
              _cimg_draw_fill_test_neighbor(xc,yc-1,nzc,yc!=0);
              _cimg_draw_fill_test_neighbor(xc,yc+1,nzc,yc<H1);
            }
          } while (cont);
        } while (posr1>posr0);
        else do { // 2d version of the filling algorithm
          const unsigned int *pcurr = remaining.data(0,posr0++), xc = *(pcurr++), yc = *(pcurr++);
          if (posr0>=512) { remaining.shift(0,-(int)posr0); posr1-=posr0; posr0 = 0; }
          bool cont, res;
          unsigned int nxc = xc;
          do { // X-backward
            _cimg_draw_fill_set(nxc,yc,0);
            _cimg_draw_fill_test_neighbor(nxc,yc-1,0,yc!=0);
            _cimg_draw_fill_test_neighbor(nxc,yc+1,0,yc<H1);
            if (high_connexity) {
              _cimg_draw_fill_test_neighbor(nxc-1,yc-1,0,(nxc!=0 && yc!=0));
              _cimg_draw_fill_test_neighbor(nxc+1,yc-1,0,(nxc<W1 && yc!=0));
              _cimg_draw_fill_test_neighbor(nxc-1,yc+1,0,(nxc!=0 && yc<H1));
              _cimg_draw_fill_test_neighbor(nxc+1,yc+1,0,(nxc<W1 && yc<H1));
            }
            if (nxc) { --nxc; _cimg_draw_fill_test(nxc,yc,0,cont); } else cont = false;
          } while (cont);
          nxc = xc;
          do { // X-forward
            if ((++nxc)<=W1) { _cimg_draw_fill_test(nxc,yc,0,cont); } else cont = false;
            if (cont) {
              _cimg_draw_fill_set(nxc,yc,0);
              _cimg_draw_fill_test_neighbor(nxc,yc-1,0,yc!=0);
              _cimg_draw_fill_test_neighbor(nxc,yc+1,0,yc<H1);
              if (high_connexity) {
                _cimg_draw_fill_test_neighbor(nxc-1,yc-1,0,(nxc!=0 && yc!=0));
                _cimg_draw_fill_test_neighbor(nxc+1,yc-1,0,(nxc<W1 && yc!=0));
                _cimg_draw_fill_test_neighbor(nxc-1,yc+1,0,(nxc!=0 && yc<H1));
                _cimg_draw_fill_test_neighbor(nxc+1,yc+1,0,(nxc<W1 && yc<H1));
              }
            }
          } while (cont);
          unsigned int nyc = yc;
          do { // Y-backward
            if (nyc) { --nyc; _cimg_draw_fill_test(xc,nyc,0,cont); } else cont = false;
            if (cont) {
              _cimg_draw_fill_set(xc,nyc,0);
              _cimg_draw_fill_test_neighbor(xc-1,nyc,0,xc!=0);
              _cimg_draw_fill_test_neighbor(xc+1,nyc,0,xc<W1);
              if (high_connexity) {
                _cimg_draw_fill_test_neighbor(xc-1,nyc-1,0,(xc!=0 && nyc!=0));
                _cimg_draw_fill_test_neighbor(xc+1,nyc-1,0,(xc<W1 && nyc!=0));
                _cimg_draw_fill_test_neighbor(xc-1,nyc+1,0,(xc!=0 && nyc<H1));
                _cimg_draw_fill_test_neighbor(xc+1,nyc+1,0,(xc<W1 && nyc<H1));
              }
            }
          } while (cont);
          nyc = yc;
          do { // Y-forward
            if ((++nyc)<=H1) { _cimg_draw_fill_test(xc,nyc,0,cont); } else cont = false;
            if (cont) {
              _cimg_draw_fill_set(xc,nyc,0);
              _cimg_draw_fill_test_neighbor(xc-1,nyc,0,xc!=0);
              _cimg_draw_fill_test_neighbor(xc+1,nyc,0,xc<W1);
              if (high_connexity) {
                _cimg_draw_fill_test_neighbor(xc-1,nyc-1,0,(xc!=0 && nyc!=0));
                _cimg_draw_fill_test_neighbor(xc+1,nyc-1,0,(xc<W1 && nyc!=0));
                _cimg_draw_fill_test_neighbor(xc-1,nyc+1,0,(xc!=0 && nyc<H1));
                _cimg_draw_fill_test_neighbor(xc+1,nyc+1,0,(xc<W1 && nyc<H1));
              }
            }
          } while (cont);
        } while (posr1>posr0);
        if (noregion) cimg_for(region,ptrd,t) if (*ptrd==noregion) *ptrd = (t)0;
      }
      return *this;
    }

    //! Draw a 3d filled region starting from a point (\c x,\c y,\ z) in the instance image.
    /**
       \param x = X-coordinate of the starting point of the region to fill.
       \param y = Y-coordinate of the starting point of the region to fill.
       \param z = Z-coordinate of the starting point of the region to fill.
       \param color = an array of spectrum() values of type \c T, defining the drawing color.
       \param sigma = tolerance concerning neighborhood values.
       \param opacity = opacity of the drawing.
    **/
    template<typename tc>
    CImg<T>& draw_fill(const int x, const int y, const int z,
                       const tc *const color, const float opacity=1,
                       const float sigma=0, const bool high_connexity=false) {
      CImg<boolT> tmp;
      return draw_fill(x,y,z,color,opacity,tmp,sigma,high_connexity);
    }

    //! Draw a 2d filled region starting from a point (\c x,\c y) in the instance image.
    /**
       \param x = X-coordinate of the starting point of the region to fill.
       \param y = Y-coordinate of the starting point of the region to fill.
       \param color = an array of spectrum() values of type \c T, defining the drawing color.
       \param sigma = tolerance concerning neighborhood values.
       \param opacity = opacity of the drawing.
    **/
    template<typename tc>
    CImg<T>& draw_fill(const int x, const int y,
                       const tc *const color, const float opacity=1,
                       const float sigma=0, const bool high_connexity=false) {
      CImg<boolT> tmp;
      return draw_fill(x,y,0,color,opacity,tmp,sigma,high_connexity);
    }

    //! Draw a plasma random texture.
    /**
       \param x0 = X-coordinate of the upper-left corner of the plasma.
       \param y0 = Y-coordinate of the upper-left corner of the plasma.
       \param x1 = X-coordinate of the lower-right corner of the plasma.
       \param y1 = Y-coordinate of the lower-right corner of the plasma.
       \param alpha = Alpha-parameter of the plasma.
       \param beta = Beta-parameter of the plasma.
       \param opacity = opacity of the drawing.
    **/
    CImg<T>& draw_plasma(const int x0, const int y0, const int x1, const int y1,
                         const float alpha=1, const float beta=1,
                         const float opacity=1) {
      if (!is_empty()) {
        const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
        int nx0 = x0, nx1 = x1, ny0 = y0, ny1 = y1;
        if (nx1<nx0) cimg::swap(nx0,nx1);
        if (ny1<ny0) cimg::swap(ny0,ny1);
        if (nx0<0) nx0 = 0;
        if (nx1>=width()) nx1 = _width-1;
        if (ny0<0) ny0 = 0;
        if (ny1>=height()) ny1 = _height-1;
        const int xc = (nx0+nx1)/2, yc = (ny0+ny1)/2, dx = (xc-nx0), dy = (yc-ny0);
        const Tfloat
          dc = (Tfloat)(std::sqrt((float)(dx*dx+dy*dy))*alpha + beta),
          vmin = (Tfloat)cimg::type<T>::min(),
          vmax = (Tfloat)cimg::type<T>::max();
        Tfloat val = 0;
        cimg_forC(*this,c) {
          if (opacity>=1) {
            const Tfloat
              val0 = (Tfloat)((*this)(nx0,ny0,0,c)), val1 = (Tfloat)((*this)(nx1,ny0,0,c)),
              val2 = (Tfloat)((*this)(nx0,ny1,0,c)), val3 = (Tfloat)((*this)(nx1,ny1,0,c));
            (*this)(xc,ny0,0,c) = (T)((val0+val1)/2);
            (*this)(xc,ny1,0,c) = (T)((val2+val3)/2);
            (*this)(nx0,yc,0,c) = (T)((val0+val2)/2);
            (*this)(nx1,yc,0,c) = (T)((val1+val3)/2);
            do {
              val = (Tfloat)(0.25f*((Tfloat)((*this)(nx0,ny0,0,c)) +
                                    (Tfloat)((*this)(nx1,ny0,0,c)) +
                                    (Tfloat)((*this)(nx1,ny1,0,c)) +
                                    (Tfloat)((*this)(nx0,ny1,0,c))) +
                             dc*cimg::grand());
            } while (val<vmin || val>vmax);
            (*this)(xc,yc,0,c) = (T)val;
          } else {
            const Tfloat
              val0 = (Tfloat)((*this)(nx0,ny0,0,c)), val1 = (Tfloat)((*this)(nx1,ny0,0,c)),
              val2 = (Tfloat)((*this)(nx0,ny1,0,c)), val3 = (Tfloat)((*this)(nx1,ny1,0,c));
            (*this)(xc,ny0,0,c) = (T)(((val0+val1)*nopacity + copacity*(*this)(xc,ny0,0,c))/2);
            (*this)(xc,ny1,0,c) = (T)(((val2+val3)*nopacity + copacity*(*this)(xc,ny1,0,c))/2);
            (*this)(nx0,yc,0,c) = (T)(((val0+val2)*nopacity + copacity*(*this)(nx0,yc,0,c))/2);
            (*this)(nx1,yc,0,c) = (T)(((val1+val3)*nopacity + copacity*(*this)(nx1,yc,0,c))/2);
            do {
              val = (Tfloat)(0.25f*(((Tfloat)((*this)(nx0,ny0,0,c)) +
                                     (Tfloat)((*this)(nx1,ny0,0,c)) +
                                     (Tfloat)((*this)(nx1,ny1,0,c)) +
                                     (Tfloat)((*this)(nx0,ny1,0,c))) +
                                    dc*cimg::grand())*nopacity + copacity*(*this)(xc,yc,0,c));
            } while (val<vmin || val>vmax);
            (*this)(xc,yc,0,c) = (T)val;
          }
        }
        if (xc!=nx0 || yc!=ny0) {
          draw_plasma(nx0,ny0,xc,yc,alpha,beta,opacity);
          draw_plasma(xc,ny0,nx1,yc,alpha,beta,opacity);
          draw_plasma(nx0,yc,xc,ny1,alpha,beta,opacity);
          draw_plasma(xc,yc,nx1,ny1,alpha,beta,opacity);
        }
      }
      return *this;
    }

    //! Draw a plasma random texture.
    /**
       \param alpha = Alpha-parameter of the plasma.
       \param beta = Beta-parameter of the plasma.
       \param opacity = opacity of the drawing.
    **/
    CImg<T>& draw_plasma(const float alpha=1, const float beta=1,
                         const float opacity=1) {
      return draw_plasma(0,0,_width-1,_height-1,alpha,beta,opacity);
    }

    //! Draw a quadratic Mandelbrot or Julia fractal set, computed using the Escape Time Algorithm.
    template<typename tc>
    CImg<T>& draw_mandelbrot(const int x0, const int y0, const int x1, const int y1,
                             const CImg<tc>& color_palette, const float opacity=1,
                             const double z0r=-2, const double z0i=-2, const double z1r=2, const double z1i=2,
                             const unsigned int iteration_max=255,
                             const bool normalized_iteration=false,
                             const bool julia_set=false,
                             const double paramr=0, const double parami=0) {
      if (is_empty()) return *this;
      CImg<tc> palette;
      if (color_palette) palette.assign(color_palette._data,color_palette.size()/color_palette._spectrum,1,1,color_palette._spectrum,true);
      if (palette && palette._spectrum!=_spectrum)
        throw CImgArgumentException(_cimg_instance
                                    "draw_mandelbrot() : Instance and specified color palette (%u,%u,%u,%u,%p) have incompatible dimensions.",
                                    cimg_instance,
                                    color_palette._width,color_palette._height,color_palette._depth,color_palette._spectrum,color_palette._data);

      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0), ln2 = (float)std::log(2.0);
      unsigned int iteration = 0;
      cimg_for_inXY(*this,x0,y0,x1,y1,p,q) {
        const double x = z0r + p*(z1r-z0r)/_width, y = z0i + q*(z1i-z0i)/_height;
        double zr, zi, cr, ci;
        if (julia_set) { zr = x; zi = y; cr = paramr; ci = parami; }
        else { zr = paramr; zi = parami; cr = x; ci = y; }
        for (iteration=1; zr*zr + zi*zi<=4 && iteration<=iteration_max; ++iteration) {
          const double temp = zr*zr - zi*zi + cr;
          zi = 2*zr*zi + ci;
          zr = temp;
        }
        if (iteration>iteration_max) {
          if (palette) {
            if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)palette(0,c);
            else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)(palette(0,c)*nopacity + (*this)(p,q,0,c)*copacity);
          } else {
            if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)0;
            else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)((*this)(p,q,0,c)*copacity);
          }
        } else if (normalized_iteration) {
          const float
            normz = (float)cimg::abs(zr*zr+zi*zi),
            niteration = (float)(iteration + 1 - std::log(std::log(normz))/ln2);
          if (palette) {
            if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)palette._linear_atX(niteration,c);
            else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)(palette._linear_atX(niteration,c)*nopacity + (*this)(p,q,0,c)*copacity);
          } else {
            if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)niteration;
            else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)(niteration*nopacity + (*this)(p,q,0,c)*copacity);
          }
        } else {
          if (palette) {
            if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)palette._atX(iteration,c);
            else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)(palette(iteration,c)*nopacity + (*this)(p,q,0,c)*copacity);
          } else {
            if (opacity>=1) cimg_forC(*this,c) (*this)(p,q,0,c) = (T)iteration;
            else cimg_forC(*this,c) (*this)(p,q,0,c) = (T)(iteration*nopacity + (*this)(p,q,0,c)*copacity);
          }
        }
      }
      return *this;
    }

    //! Draw a quadratic Mandelbrot or Julia fractal set, computed using the Escape Time Algorithm.
    template<typename tc>
    CImg<T>& draw_mandelbrot(const CImg<tc>& color_palette, const float opacity=1,
                             const double z0r=-2, const double z0i=-2, const double z1r=2, const double z1i=2,
                             const unsigned int iteration_max=255,
                             const bool normalized_iteration=false,
                             const bool julia_set=false,
                             const double paramr=0, const double parami=0) {
      return draw_mandelbrot(0,0,_width-1,_height-1,color_palette,opacity,
                             z0r,z0i,z1r,z1i,iteration_max,normalized_iteration,julia_set,paramr,parami);
    }

    //! Draw a 1d gaussian function in the instance image.
    /**
       \param xc = X-coordinate of the gaussian center.
       \param sigma = Standard variation of the gaussian distribution.
       \param color = array of spectrum() values of type \c T, defining the drawing color.
       \param opacity = opacity of the drawing.
    **/
    template<typename tc>
    CImg<T>& draw_gaussian(const float xc, const float sigma,
                           const tc *const color, const float opacity=1) {
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_gaussian() : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      const float sigma2 = 2*sigma*sigma, nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const unsigned int whd = _width*_height*_depth;
      const tc *col = color;
      cimg_forX(*this,x) {
        const float dx = (x - xc), val = (float)std::exp(-dx*dx/sigma2);
        T *ptrd = data(x,0,0,0);
        if (opacity>=1) cimg_forC(*this,c) { *ptrd = (T)(val*(*col++)); ptrd+=whd; }
        else cimg_forC(*this,c) { *ptrd = (T)(nopacity*val*(*col++) + *ptrd*copacity); ptrd+=whd; }
        col-=_spectrum;
      }
      return *this;
    }

    //! Draw an anisotropic 2d gaussian function.
    /**
       \param xc = X-coordinate of the gaussian center.
       \param yc = Y-coordinate of the gaussian center.
       \param tensor = 2x2 covariance matrix.
       \param color = array of spectrum() values of type \c T, defining the drawing color.
       \param opacity = opacity of the drawing.
    **/
    template<typename t, typename tc>
    CImg<T>& draw_gaussian(const float xc, const float yc, const CImg<t>& tensor,
                           const tc *const color, const float opacity=1) {
      if (tensor._width!=2 || tensor._height!=2 || tensor._depth!=1 || tensor._spectrum!=1)
        throw CImgArgumentException(_cimg_instance
                                    "draw_gaussian() : Specified tensor (%u,%u,%u,%u,%p) is not a 2x2 matrix.",
                                    cimg_instance,
                                    tensor._width,tensor._height,tensor._depth,tensor._spectrum,tensor._data);
      if (!color)
        throw CImgArgumentException(_cimg_instance
                                    "draw_gaussian() : Specified color is (null).",
                                    cimg_instance);

      if (is_empty()) return *this;
      typedef typename CImg<t>::Tfloat tfloat;
      const CImg<tfloat> invT = tensor.get_invert(), invT2 = (invT*invT)/(-2.0);
      const tfloat a = invT2(0,0), b = 2*invT2(1,0), c = invT2(1,1);
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const unsigned int whd = _width*_height*_depth;
      const tc *col = color;
      float dy = -yc;
      cimg_forY(*this,y) {
        float dx = -xc;
        cimg_forX(*this,x) {
          const float val = (float)std::exp(a*dx*dx + b*dx*dy + c*dy*dy);
          T *ptrd = data(x,y,0,0);
          if (opacity>=1) cimg_forC(*this,c) { *ptrd = (T)(val*(*col++)); ptrd+=whd; }
          else cimg_forC(*this,c) { *ptrd = (T)(nopacity*val*(*col++) + *ptrd*copacity); ptrd+=whd; }
          col-=_spectrum;
          ++dx;
        }
        ++dy;
      }
      return *this;
    }

    //! Draw an anisotropic 2d gaussian function.
    template<typename tc>
    CImg<T>& draw_gaussian(const int xc, const int yc, const float r1, const float r2, const float ru, const float rv,
                           const tc *const color, const float opacity=1) {
      const double
        a = r1*ru*ru + r2*rv*rv,
        b = (r1-r2)*ru*rv,
        c = r1*rv*rv + r2*ru*ru;
      const CImg<Tfloat> tensor(2,2,1,1, a,b,b,c);
      return draw_gaussian(xc,yc,tensor,color,opacity);
    }

    //! Draw an isotropic 2d gaussian function.
    /**
       \param xc = X-coordinate of the gaussian center.
       \param yc = Y-coordinate of the gaussian center.
       \param sigma = standard variation of the gaussian distribution.
       \param color = array of spectrum() values of type \c T, defining the drawing color.
       \param opacity = opacity of the drawing.
    **/
    template<typename tc>
    CImg<T>& draw_gaussian(const float xc, const float yc, const float sigma,
                           const tc *const color, const float opacity=1) {
      return draw_gaussian(xc,yc,CImg<floatT>::diagonal(sigma,sigma),color,opacity);
    }

    //! Draw an anisotropic 3d gaussian function.
    /**
       \param xc = X-coordinate of the gaussian center.
       \param yc = Y-coordinate of the gaussian center.
       \param zc = Z-coordinate of the gaussian center.
       \param tensor = 3x3 covariance matrix.
       \param color = array of spectrum() values of type \c T, defining the drawing color.
       \param opacity = opacity of the drawing.
    **/
    template<typename t, typename tc>
    CImg<T>& draw_gaussian(const float xc, const float yc, const float zc, const CImg<t>& tensor,
                           const tc *const color, const float opacity=1) {
      if (is_empty()) return *this;
      typedef typename CImg<t>::Tfloat tfloat;
      if (tensor._width!=3 || tensor._height!=3 || tensor._depth!=1 || tensor._spectrum!=1)
        throw CImgArgumentException(_cimg_instance
                                    "draw_gaussian() : Specified tensor (%u,%u,%u,%u,%p) is not a 3x3 matrix.",
                                    cimg_instance,
                                    tensor._width,tensor._height,tensor._depth,tensor._spectrum,tensor._data);

      const CImg<tfloat> invT = tensor.get_invert(), invT2 = (invT*invT)/(-2.0);
      const tfloat a = invT(0,0), b = 2*invT(1,0), c = 2*invT(2,0), d = invT(1,1), e = 2*invT(2,1), f = invT(2,2);
      const float nopacity = cimg::abs(opacity), copacity = 1 - cimg::max(opacity,0);
      const unsigned int whd = _width*_height*_depth;
      const tc *col = color;
      cimg_forXYZ(*this,x,y,z) {
        const float
          dx = (x - xc), dy = (y - yc), dz = (z - zc),
          val = (float)std::exp(a*dx*dx + b*dx*dy + c*dx*dz + d*dy*dy + e*dy*dz + f*dz*dz);
        T *ptrd = data(x,y,z,0);
        if (opacity>=1) cimg_forC(*this,c) { *ptrd = (T)(val*(*col++)); ptrd+=whd; }
        else cimg_forC(*this,c) { *ptrd = (T)(nopacity*val*(*col++) + *ptrd*copacity); ptrd+=whd; }
        col-=_spectrum;
      }
      return *this;
    }

    //! Draw an isotropic 3d gaussian function.
   /**
       \param xc = X-coordinate of the gaussian center.
       \param yc = Y-coordinate of the gaussian center.
       \param zc = Z-coordinate of the gaussian center.
       \param sigma = standard variation of the gaussian distribution.
       \param color = array of spectrum() values of type \c T, defining the drawing color.
       \param opacity = opacity of the drawing.
    **/
    template<typename tc>
    CImg<T>& draw_gaussian(const float xc, const float yc, const float zc, const float sigma,
                           const tc *const color, const float opacity=1) {
      return draw_gaussian(xc,yc,zc,CImg<floatT>::diagonal(sigma,sigma,sigma),color,opacity);
    }

    //! Draw a 3d object.
    /**
       \param X = X-coordinate of the 3d object position
       \param Y = Y-coordinate of the 3d object position
       \param Z = Z-coordinate of the 3d object position
       \param vertices = Image Nx3 describing 3d point coordinates
       \param primitives = List of P primitives
       \param colors = List of P color (or textures)
       \param opacities = Image or list of P opacities
       \param render_type = Render type (0=Points, 1=Lines, 2=Faces (no light), 3=Faces (flat), 4=Faces(Gouraud)
       \param double_sided = Tell if object faces have two sides or are oriented.
       \param focale = length of the focale (0 for parallel projection)
       \param lightx = X-coordinate of the light
       \param lighty = Y-coordinate of the light
       \param lightz = Z-coordinate of the light
       \param specular_shine = Shininess of the object
    **/
    template<typename tp, typename tf, typename tc, typename to>
    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors, const CImg<to>& opacities,
                           const unsigned int render_type=4,
                           const bool double_sided=false, const float focale=500,
                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
                           const float specular_light=0.2f, const float specular_shine=0.1f) {
      return draw_object3d(x0,y0,z0,vertices,primitives,colors,opacities,render_type,double_sided,focale,lightx,lighty,lightz,
                           specular_light,specular_shine,CImg<floatT>::empty());
    }

    template<typename tp, typename tf, typename tc, typename to, typename tz>
    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors, const CImg<to>& opacities,
                           const unsigned int render_type,
                           const bool double_sided, const float focale,
                           const float lightx, const float lighty, const float lightz,
                           const float specular_light, const float specular_shine,
                           CImg<tz>& zbuffer) {
      return _draw_object3d(0,zbuffer,x0,y0,z0,vertices,primitives,colors,opacities,
                            render_type,double_sided,focale,lightx,lighty,lightz,specular_light,specular_shine,1);
    }

#ifdef cimg_use_board
    template<typename tp, typename tf, typename tc, typename to>
    CImg<T>& draw_object3d(LibBoard::Board& board,
                           const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors, const CImg<to>& opacities,
                           const unsigned int render_type=4,
                           const bool double_sided=false, const float focale=500,
                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
                           const float specular_light=0.2f, const float specular_shine=0.1f) {
      return draw_object3d(board,x0,y0,z0,vertices,primitives,colors,opacities,render_type,double_sided,focale,lightx,lighty,lightz,
                           specular_light,specular_shine,CImg<floatT>::empty());
    }

    template<typename tp, typename tf, typename tc, typename to, typename tz>
    CImg<T>& draw_object3d(LibBoard::Board& board,
                           const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors, const CImg<to>& opacities,
                           const unsigned int render_type,
                           const bool double_sided, const float focale,
                           const float lightx, const float lighty, const float lightz,
                           const float specular_light, const float specular_shine,
                           CImg<tz>& zbuffer) {
      return _draw_object3d((void*)&board,zbuffer,x0,y0,z0,vertices,primitives,colors,opacities,
                            render_type,double_sided,focale,lightx,lighty,lightz,specular_light,specular_shine,1);
    }
#endif

    template<typename tp, typename tf, typename tc, typename to>
    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors, const CImgList<to>& opacities,
                           const unsigned int render_type=4,
                           const bool double_sided=false, const float focale=500,
                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
                           const float specular_light=0.2f, const float specular_shine=0.1f) {
      return draw_object3d(x0,y0,z0,vertices,primitives,colors,opacities,render_type,double_sided,focale,lightx,lighty,lightz,
                           specular_light,specular_shine,CImg<floatT>::empty());
    }

    template<typename tp, typename tf, typename tc, typename to, typename tz>
    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors, const CImgList<to>& opacities,
                           const unsigned int render_type,
                           const bool double_sided, const float focale,
                           const float lightx, const float lighty, const float lightz,
                           const float specular_light, const float specular_shine,
                           CImg<tz>& zbuffer) {
      return _draw_object3d(0,zbuffer,x0,y0,z0,vertices,primitives,colors,opacities,
                            render_type,double_sided,focale,lightx,lighty,lightz,specular_light,specular_shine,1);
    }

#ifdef cimg_use_board
    template<typename tp, typename tf, typename tc, typename to>
    CImg<T>& draw_object3d(LibBoard::Board& board,
                           const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors, const CImgList<to>& opacities,
                           const unsigned int render_type=4,
                           const bool double_sided=false, const float focale=500,
                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
                           const float specular_light=0.2f, const float specular_shine=0.1f) {
      return draw_object3d(board,x0,y0,z0,vertices,primitives,colors,opacities,render_type,double_sided,focale,lightx,lighty,lightz,
                           specular_light,specular_shine,CImg<floatT>::empty());
    }

    template<typename tp, typename tf, typename tc, typename to, typename tz>
    CImg<T>& draw_object3d(LibBoard::Board& board,
                           const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors, const CImgList<to>& opacities,
                           const unsigned int render_type,
                           const bool double_sided, const float focale,
                           const float lightx, const float lighty, const float lightz,
                           const float specular_light, const float specular_shine,
                           CImg<tz>& zbuffer) {
      return _draw_object3d((void*)&board,zbuffer,x0,y0,z0,vertices,primitives,colors,opacities,
                            render_type,double_sided,focale,lightx,lighty,lightz,specular_light,specular_shine,1);
    }
#endif

    //! Draw a 3d object.
    template<typename tp, typename tf, typename tc>
    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors,
                           const unsigned int render_type=4,
                           const bool double_sided=false, const float focale=500,
                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
                           const float specular_light=0.2f, const float specular_shine=0.1f) {
      return draw_object3d(x0,y0,z0,vertices,primitives,colors,CImg<floatT>::empty(),
                           render_type,double_sided,focale,lightx,lighty,lightz,specular_light,specular_shine,CImg<floatT>::empty());
    }

    template<typename tp, typename tf, typename tc, typename tz>
    CImg<T>& draw_object3d(const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors,
                           const unsigned int render_type,
                           const bool double_sided, const float focale,
                           const float lightx, const float lighty, const float lightz,
                           const float specular_light, const float specular_shine,
                           CImg<tz>& zbuffer) {
      return draw_object3d(x0,y0,z0,vertices,primitives,colors,CImg<floatT>::empty(),
                           render_type,double_sided,focale,lightx,lighty,lightz,specular_light,specular_shine,zbuffer);
    }

#ifdef cimg_use_board
    template<typename tp, typename tf, typename tc, typename to>
    CImg<T>& draw_object3d(LibBoard::Board& board,
                           const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors,
                           const unsigned int render_type=4,
                           const bool double_sided=false, const float focale=500,
                           const float lightx=0, const float lighty=0, const float lightz=-5e8,
                           const float specular_light=0.2f, const float specular_shine=0.1f) {
      return draw_object3d(x0,y0,z0,vertices,primitives,colors,CImg<floatT>::empty(),
                           render_type,double_sided,focale,lightx,lighty,lightz,specular_light,specular_shine,CImg<floatT>::empty());
    }

    template<typename tp, typename tf, typename tc, typename to, typename tz>
    CImg<T>& draw_object3d(LibBoard::Board& board,
                           const float x0, const float y0, const float z0,
                           const CImg<tp>& vertices, const CImgList<tf>& primitives,
                           const CImgList<tc>& colors,
                           const unsigned int render_type,
                           const bool double_sided, const float focale,
                           const float lightx, const float lighty, const float lightz,
                           const float specular_light, const float specular_shine,
                           CImg<tz>& zbuffer) {
      return draw_object3d(x0,y0,z0,vertices,primitives,colors,CImg<floatT>::empty(),
                           render_type,double_sided,focale,lightx,lighty,lightz,specular_light,specular_shine,zbuffer);
    }
#endif

    template<typename tc, typename to>
    void __draw_object3d(const unsigned int n_primitive, const CImgList<to>& opacities, const CImg<tc>& color,
                         const int nx0, const int ny0, const CImg<T>& sprite, const float opac) {
      if (n_primitive<opacities._width && opacities[n_primitive].is_sameXY(color))
        draw_image(nx0,ny0,sprite,opacities[n_primitive].get_resize(sprite._width,sprite._height,1,sprite._spectrum,1));
      else draw_image(nx0,ny0,sprite,opac);
    }

    template<typename tc, typename to>
    void __draw_object3d(const unsigned int, const CImg<to>&, const CImg<tc>&,
                         const int nx0, const int ny0, const CImg<T>& sprite, const float opac) {
      draw_image(nx0,ny0,sprite,opac);
    }

    template<typename tz, typename tp, typename tf, typename tc, typename to>
    CImg<T>& _draw_object3d(void *const pboard, CImg<tz>& zbuffer,
                            const float X, const float Y, const float Z,
                            const CImg<tp>& vertices,
                            const CImgList<tf>& primitives,
                            const CImgList<tc>& colors,
                            const to& opacities,
                            const unsigned int render_type,
                            const bool double_sided, const float focale,
                            const float lightx, const float lighty, const float lightz,
                            const float specular_light, const float specular_shine,
                            const float sprite_scale) {
      typedef typename cimg::superset2<tp,tz,float>::type tpfloat;
      if (is_empty() || !vertices || !primitives) return *this;
      char error_message[1024] = { 0 };
      if (!vertices.is_object3d(primitives,colors,opacities,false,error_message))
        throw CImgArgumentException(_cimg_instance
                                    "draw_object3d() : Invalid specified 3d object (%u,%u) (%s).",
                                    cimg_instance,vertices._width,primitives._width,error_message);
#ifndef cimg_use_board
      if (pboard) return *this;
#endif
      const float
        nspec = 1 - (specular_light<0.0f?0.0f:(specular_light>1.0f?1.0f:specular_light)),
        nspec2 = 1 + (specular_shine<0.0f?0.0f:specular_shine),
        nsl1 = (nspec2 - 1)/cimg::sqr(nspec - 1),
        nsl2 = 1 - 2*nsl1*nspec,
        nsl3 = nspec2 - nsl1 - nsl2;

      // Create light texture for phong-like rendering.
      CImg<floatT> light_texture;
      if (render_type==5) {
        if (colors._width>primitives._width) {
          static CImg<floatT> default_light_texture;
          static const tc *lptr = 0;
          static tc ref_values[64] = { 0 };
          const CImg<tc>& img = colors.back();
          bool is_same_texture = (lptr==img._data);
          if (is_same_texture)
            for (unsigned int r = 0, j = 0; j<8; ++j)
              for (unsigned int i = 0; i<8; ++i)
                if (ref_values[r++]!=img(i*img._width/9,j*img._height/9,0,(i+j)%img._spectrum)) { is_same_texture = false; break; }
          if (!is_same_texture || default_light_texture._spectrum<_spectrum) {
            (default_light_texture.assign(img,false)/=255).resize(-100,-100,1,_spectrum);
            lptr = colors.back().data();
            for (unsigned int r = 0, j = 0; j<8; ++j)
              for (unsigned int i = 0; i<8; ++i)
                ref_values[r++] = img(i*img._width/9,j*img._height/9,0,(i+j)%img._spectrum);
          }
          light_texture.assign(default_light_texture,true);
        } else {
          static CImg<floatT> default_light_texture;
          static float olightx = 0, olighty = 0, olightz = 0, ospecular_shine = 0;
          if (!default_light_texture ||
              lightx!=olightx || lighty!=olighty || lightz!=olightz ||
              specular_shine!=ospecular_shine || default_light_texture._spectrum<_spectrum) {
            default_light_texture.assign(512,512);
            const float
              dlx = lightx - X,
              dly = lighty - Y,
              dlz = lightz - Z,
              nl = (float)std::sqrt(dlx*dlx + dly*dly + dlz*dlz),
              nlx = default_light_texture._width/2*(1 + dlx/nl),
              nly = default_light_texture._height/2*(1 + dly/nl),
              white[] = { 1 };
            default_light_texture.draw_gaussian(nlx,nly,default_light_texture._width/3.0f,white);
            cimg_forXY(default_light_texture,x,y) {
              const float factor = default_light_texture(x,y);
              if (factor>nspec) default_light_texture(x,y) = cimg::min(2,nsl1*factor*factor + nsl2*factor + nsl3);
            }
            default_light_texture.resize(-100,-100,1,_spectrum);
            olightx = lightx; olighty = lighty; olightz = lightz; ospecular_shine = specular_shine;
          }
          light_texture.assign(default_light_texture,true);
        }
      }

      // Compute 3d to 2d projection.
      CImg<tpfloat> projections(vertices._width,2);
      tpfloat parallzmin = cimg::type<tpfloat>::max();
      const float absfocale = focale?cimg::abs(focale):0;
      if (absfocale) cimg_forX(projections,l) { // Perspective projection
          const tpfloat
            x = (tpfloat)vertices(l,0),
            y = (tpfloat)vertices(l,1),
            z = (tpfloat)vertices(l,2);
          const tpfloat projectedz = z + Z + absfocale;
          projections(l,1) = Y + absfocale*y/projectedz;
          projections(l,0) = X + absfocale*x/projectedz;
        } else cimg_forX(projections,l) { // Parallel projection
          const tpfloat
            x = (tpfloat)vertices(l,0),
            y = (tpfloat)vertices(l,1),
            z = (tpfloat)vertices(l,2);
          if (z<parallzmin) parallzmin = z;
          projections(l,1) = Y + y;
          projections(l,0) = X + x;
        }

      // Compute and sort visible primitives.
      CImg<uintT> visibles(primitives._width);
      CImg<tpfloat> zrange(primitives._width);
      unsigned int nb_visibles = 0;
      const tpfloat zmin = absfocale?(tpfloat)(1.5f - absfocale):cimg::type<tpfloat>::min();
      cimglist_for(primitives,l) {
        const CImg<tf>& primitive = primitives[l];
        switch (primitive.size()) {
        case 1 : { // Point
          const unsigned int i0 = (unsigned int)primitive(0);
          const tpfloat z0 = Z + vertices(i0,2);
          if (z0>zmin) {
            visibles(nb_visibles) = (unsigned int)l;
            zrange(nb_visibles++) = z0;
          }
        } break;
        case 5 : { // Sphere
          const unsigned int
            i0 = (unsigned int)primitive(0),
            i1 = (unsigned int)primitive(1);
          const tpfloat
            x0 = projections(i0,0), y0 = projections(i0,1), z0 = Z + vertices(i0,2),
            x1 = projections(i1,0), y1 = projections(i1,1), z1 = Z + vertices(i1,2);
          tpfloat xm, xM, ym, yM;
          if (x0<x1) { xm = x0; xM = x1; } else { xm = x1; xM = x0; }
          if (y0<y1) { ym = y0; yM = y1; } else { ym = y1; yM = y0; }
          if (xM>=0 && xm<_width && yM>=0 && ym<_height && z0>zmin && z1>zmin) {
            visibles(nb_visibles) = (unsigned int)l;
            zrange(nb_visibles++) = (z0 + z1)/2;
          }
        } break;
        case 2 : // Segment
        case 6 : {
          const unsigned int
            i0 = (unsigned int)primitive(0),
            i1 = (unsigned int)primitive(1);
          const tpfloat
            x0 = projections(i0,0), y0 = projections(i0,1), z0 = Z + vertices(i0,2),
            x1 = projections(i1,0), y1 = projections(i1,1), z1 = Z + vertices(i1,2);
          tpfloat xm, xM, ym, yM;
          if (x0<x1) { xm = x0; xM = x1; } else { xm = x1; xM = x0; }
          if (y0<y1) { ym = y0; yM = y1; } else { ym = y1; yM = y0; }
          if (xM>=0 && xm<_width && yM>=0 && ym<_height && z0>zmin && z1>zmin) {
            visibles(nb_visibles) = (unsigned int)l;
            zrange(nb_visibles++) = (z0 + z1)/2;
          }
        } break;
        case 3 :  // Triangle
        case 9 : {
          const unsigned int
            i0 = (unsigned int)primitive(0),
            i1 = (unsigned int)primitive(1),
            i2 = (unsigned int)primitive(2);
          const tpfloat
            x0 = projections(i0,0), y0 = projections(i0,1), z0 = Z + vertices(i0,2),
            x1 = projections(i1,0), y1 = projections(i1,1), z1 = Z + vertices(i1,2),
            x2 = projections(i2,0), y2 = projections(i2,1), z2 = Z + vertices(i2,2);
          tpfloat xm, xM, ym, yM;
          if (x0<x1) { xm = x0; xM = x1; } else { xm = x1; xM = x0; }
          if (x2<xm) xm = x2;
          if (x2>xM) xM = x2;
          if (y0<y1) { ym = y0; yM = y1; } else { ym = y1; yM = y0; }
          if (y2<ym) ym = y2;
          if (y2>yM) yM = y2;
          if (xM>=0 && xm<_width && yM>=0 && ym<_height && z0>zmin && z1>zmin && z2>zmin) {
            const tpfloat d = (x1-x0)*(y2-y0) - (x2-x0)*(y1-y0);
            if (double_sided || d<0) {
              visibles(nb_visibles) = (unsigned int)l;
              zrange(nb_visibles++) = (z0 + z1 + z2)/3;
            }
          }
        } break;
        case 4 : // Rectangle
        case 12 : {
          const unsigned int
            i0 = (unsigned int)primitive(0),
            i1 = (unsigned int)primitive(1),
            i2 = (unsigned int)primitive(2),
            i3 = (unsigned int)primitive(3);
          const tpfloat
            x0 = projections(i0,0), y0 = projections(i0,1), z0 = Z + vertices(i0,2),
            x1 = projections(i1,0), y1 = projections(i1,1), z1 = Z + vertices(i1,2),
            x2 = projections(i2,0), y2 = projections(i2,1), z2 = Z + vertices(i2,2),
            x3 = projections(i3,0), y3 = projections(i3,1), z3 = Z + vertices(i3,2);
          tpfloat xm, xM, ym, yM;
          if (x0<x1) { xm = x0; xM = x1; } else { xm = x1; xM = x0; }
          if (x2<xm) xm = x2;
          if (x2>xM) xM = x2;
          if (x3<xm) xm = x3;
          if (x3>xM) xM = x3;
          if (y0<y1) { ym = y0; yM = y1; } else { ym = y1; yM = y0; }
          if (y2<ym) ym = y2;
          if (y2>yM) yM = y2;
          if (y3<ym) ym = y3;
          if (y3>yM) yM = y3;
          if (xM>=0 && xm<_width && yM>=0 && ym<_height && z0>zmin && z1>zmin && z2>zmin) {
            const float d = (x1 - x0)*(y2 - y0) - (x2 - x0)*(y1 - y0);
            if (double_sided || d<0) {
              visibles(nb_visibles) = (unsigned int)l;
              zrange(nb_visibles++) = (z0 + z1 + z2 + z3)/4;
            }
          }
        } break;
        default :
          throw CImgArgumentException(_cimg_instance
                                      "draw_object3d() : Invalid primitive[%u] with size %u "
                                      "(should have size 1,2,3,4,5,6,9 or 12).",
                                      cimg_instance,
                                      l,primitive.size());
        }
      }
      if (nb_visibles<=0) return *this;
      CImg<uintT> permutations;
      CImg<tpfloat>(zrange._data,nb_visibles,1,1,1,true).sort(permutations,false);

      // Compute light properties
      CImg<floatT> lightprops;
      switch (render_type) {
      case 3 : { // Flat Shading
        lightprops.assign(nb_visibles);
        cimg_forX(lightprops,l) {
          const CImg<tf>& primitive = primitives(visibles(permutations(l)));
          const unsigned int psize = primitive.size();
          if (psize==3 || psize==4 || psize==9 || psize==12) {
            const unsigned int
              i0 = (unsigned int)primitive(0),
              i1 = (unsigned int)primitive(1),
              i2 = (unsigned int)primitive(2);
            const tpfloat
              x0 = (tpfloat)vertices(i0,0), y0 = (tpfloat)vertices(i0,1), z0 = (tpfloat)vertices(i0,2),
              x1 = (tpfloat)vertices(i1,0), y1 = (tpfloat)vertices(i1,1), z1 = (tpfloat)vertices(i1,2),
              x2 = (tpfloat)vertices(i2,0), y2 = (tpfloat)vertices(i2,1), z2 = (tpfloat)vertices(i2,2),
              dx1 = x1 - x0, dy1 = y1 - y0, dz1 = z1 - z0,
              dx2 = x2 - x0, dy2 = y2 - y0, dz2 = z2 - z0,
              nx = dy1*dz2 - dz1*dy2,
              ny = dz1*dx2 - dx1*dz2,
              nz = dx1*dy2 - dy1*dx2,
              norm = (tpfloat)std::sqrt(1e-5f + nx*nx + ny*ny + nz*nz),
              lx = X + (x0 + x1 + x2)/3 - lightx,
              ly = Y + (y0 + y1 + y2)/3 - lighty,
              lz = Z + (z0 + z1 + z2)/3 - lightz,
              nl = (tpfloat)std::sqrt(1e-5f + lx*lx + ly*ly + lz*lz),
              factor = cimg::max(cimg::abs(-lx*nx-ly*ny-lz*nz)/(norm*nl),0);
            lightprops[l] = factor<=nspec?factor:(nsl1*factor*factor + nsl2*factor + nsl3);
          } else lightprops[l] = 1;
        }
      } break;

      case 4 : // Gouraud Shading
      case 5 : { // Phong-Shading
        CImg<tpfloat> vertices_normals(vertices._width,3,1,1,0);
        for (unsigned int l = 0; l<nb_visibles; ++l) {
          const CImg<tf>& primitive = primitives[visibles(l)];
          const unsigned int psize = primitive.size();
          const bool
            triangle_flag = (psize==3) || (psize==9),
            rectangle_flag = (psize==4) || (psize==12);
          if (triangle_flag || rectangle_flag) {
            const unsigned int
              i0 = (unsigned int)primitive(0),
              i1 = (unsigned int)primitive(1),
              i2 = (unsigned int)primitive(2),
              i3 = rectangle_flag?(unsigned int)primitive(3):0;
            const tpfloat
              x0 = (tpfloat)vertices(i0,0), y0 = (tpfloat)vertices(i0,1), z0 = (tpfloat)vertices(i0,2),
              x1 = (tpfloat)vertices(i1,0), y1 = (tpfloat)vertices(i1,1), z1 = (tpfloat)vertices(i1,2),
              x2 = (tpfloat)vertices(i2,0), y2 = (tpfloat)vertices(i2,1), z2 = (tpfloat)vertices(i2,2),
              dx1 = x1 - x0, dy1 = y1 - y0, dz1 = z1 - z0,
              dx2 = x2 - x0, dy2 = y2 - y0, dz2 = z2 - z0,
              nnx = dy1*dz2 - dz1*dy2,
              nny = dz1*dx2 - dx1*dz2,
              nnz = dx1*dy2 - dy1*dx2,
              norm = (tpfloat)(1e-5f + std::sqrt(nnx*nnx + nny*nny + nnz*nnz)),
              nx = nnx/norm,
              ny = nny/norm,
              nz = nnz/norm;
            vertices_normals(i0,0)+=nx; vertices_normals(i0,1)+=ny; vertices_normals(i0,2)+=nz;
            vertices_normals(i1,0)+=nx; vertices_normals(i1,1)+=ny; vertices_normals(i1,2)+=nz;
            vertices_normals(i2,0)+=nx; vertices_normals(i2,1)+=ny; vertices_normals(i2,2)+=nz;
            if (rectangle_flag) { vertices_normals(i3,0)+=nx; vertices_normals(i3,1)+=ny; vertices_normals(i3,2)+=nz; }
          }
        }

        if (double_sided) cimg_forX(vertices_normals,p) if (vertices_normals(p,2)>0) {
          vertices_normals(p,0) = -vertices_normals(p,0);
          vertices_normals(p,1) = -vertices_normals(p,1);
          vertices_normals(p,2) = -vertices_normals(p,2);
        }

        if (render_type==4) {
          lightprops.assign(vertices._width);
          cimg_forX(lightprops,l) {
            const tpfloat
              nx = vertices_normals(l,0),
              ny = vertices_normals(l,1),
              nz = vertices_normals(l,2),
              norm = (tpfloat)std::sqrt(1e-5f + nx*nx + ny*ny + nz*nz),
              lx = X + vertices(l,0) - lightx,
              ly = Y + vertices(l,1) - lighty,
              lz = Z + vertices(l,2) - lightz,
              nl = (tpfloat)std::sqrt(1e-5f + lx*lx + ly*ly + lz*lz),
              factor = cimg::max((-lx*nx-ly*ny-lz*nz)/(norm*nl),0);
            lightprops[l] = factor<=nspec?factor:(nsl1*factor*factor + nsl2*factor + nsl3);
          }
        } else {
          const unsigned int
            lw2 = light_texture._width/2 - 1,
            lh2 = light_texture._height/2 - 1;
          lightprops.assign(vertices._width,2);
          cimg_forX(lightprops,l) {
            const tpfloat
              nx = vertices_normals(l,0),
              ny = vertices_normals(l,1),
              nz = vertices_normals(l,2),
              norm = (tpfloat)std::sqrt(1e-5f + nx*nx + ny*ny + nz*nz),
              nnx = nx/norm,
              nny = ny/norm;
            lightprops(l,0) = lw2*(1 + nnx);
            lightprops(l,1) = lh2*(1 + nny);
          }
        }
      } break;
      }

      // Draw visible primitives
      const float _focale = absfocale?absfocale:(1-parallzmin);
      const CImg<tc> default_color(1,_spectrum,1,1,(tc)200);
      for (unsigned int l = 0; l<nb_visibles; ++l) {
        const unsigned int n_primitive = visibles(permutations(l));
        const CImg<tf>& primitive = primitives[n_primitive];
        const CImg<tc>
          &__color = n_primitive<colors._width?colors[n_primitive]:CImg<tc>(),
          _color = (__color && __color.size()!=_spectrum && __color._spectrum<_spectrum)?colors[n_primitive].get_resize(-100,-100,-100,_spectrum,0):CImg<tc>(),
          &color = _color?_color:(__color?__color:default_color);
        const tc *const pcolor = color._data;
        const float opac = n_primitive<opacities.size()?opacities(n_primitive,0):1.0f;
#ifdef cimg_use_board
        LibBoard::Board &board = *(LibBoard::Board*)pboard;
#endif

        switch (primitive.size()) {
        case 1 : { // Colored point or sprite
          const unsigned int n0 = (unsigned int)primitive[0];
          const int x0 = (int)projections(n0,0), y0 = (int)projections(n0,1);
          if (color.size()==_spectrum) { // Colored point.
            draw_point(x0,y0,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.fillCircle((float)x0,height()-(float)y0,0);
            }
#endif
          } else { // Colored sprite.
            if (!__color)
              throw CImgArgumentException(_cimg_instance
                                          "draw_object3d() : Undefined texture for sprite primitive [%u].",
                                          cimg_instance,n_primitive);
            const tpfloat z = Z + vertices(n0,2);
            const float factor = focale<0?1:sprite_scale*(absfocale?absfocale/(z + absfocale):1);
            const unsigned int
              _sw = (unsigned int)(color._width*factor),
              _sh = (unsigned int)(color._height*factor),
              sw = _sw?_sw:1,
              sh = _sh?_sh:1;
            const int nx0 = x0 - (int)sw/2, ny0 = y0 - (int)sh/2;
            if (sw<_width && sh<_height && (nx0+(int)sw/2>=0 || nx0-(int)sw/2<width() || ny0+(int)sh/2>=0 || ny0-(int)sh/2<height())) {
              const CImg<tc>
                _sprite = (sw!=color._width || sh!=color._height)?color.get_resize(sw,sh,1,-100,render_type<=3?1:3):CImg<tc>(),
                &sprite = _sprite?_sprite:color;
              __draw_object3d(n_primitive,opacities,color,nx0,ny0,sprite,opac);
#ifdef cimg_use_board
              if (pboard) {
                board.setPenColorRGBi(128,128,128);
                board.setFillColor(LibBoard::Color::None);
                board.drawRectangle((float)nx0,height()-(float)ny0,sw,sh);
              }
#endif
            }
          }
        } break;
        case 2 : { // Colored line
          const unsigned int
            n0 = (unsigned int)primitive[0],
            n1 = (unsigned int)primitive[1];
          const int
            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1);
          const float
            z0 = vertices(n0,2) + Z + _focale,
            z1 = vertices(n1,2) + Z + _focale;
          if (render_type) {
            if (zbuffer) draw_line(zbuffer,x0,y0,z0,x1,y1,z1,pcolor,opac);
            else draw_line(x0,y0,x1,y1,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.drawLine((float)x0,height()-(float)y0,x1,height()-(float)y1);
            }
#endif
          } else {
            draw_point(x0,y0,pcolor,opac).draw_point(x1,y1,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.drawCircle((float)x0,height()-(float)y0,0);
              board.drawCircle((float)x1,height()-(float)y1,0);
            }
#endif
          }
        } break;
        case 5 : { // Colored sphere
          const unsigned int
            n0 = (unsigned int)primitive[0],
            n1 = (unsigned int)primitive[1];
          const float
            Xc = 0.5f*((float)vertices(n0,0) + (float)vertices(n1,0)),
            Yc = 0.5f*((float)vertices(n0,1) + (float)vertices(n1,1)),
            Zc = 0.5f*((float)vertices(n0,2) + (float)vertices(n1,2)),
            zc = Z + Zc + _focale,
            xc = X + Xc*(absfocale?absfocale/zc:1),
            yc = Y + Yc*(absfocale?absfocale/zc:1),
            radius = std::sqrt(cimg::sqr(Xc-vertices(n0,0)) + cimg::sqr(Yc-vertices(n0,1)) + cimg::sqr(Zc-vertices(n0,2)))*(absfocale?absfocale/zc:1);
          switch (render_type) {
          case 0 :
            draw_point((int)xc,(int)yc,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.fillCircle(xc,height()-yc,0);
            }
#endif
            break;
          case 1 :
            draw_circle((int)xc,(int)yc,(int)radius,pcolor,opac,~0U);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.setFillColor(LibBoard::Color::None);
              board.drawCircle(xc,height()-yc,radius);
            }
#endif
            break;
          default :
            draw_circle((int)xc,(int)yc,(int)radius,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.fillCircle(xc,height()-yc,radius);
            }
#endif
            break;
          }
        } break;
        case 6 : { // Textured line
          if (!__color)
            throw CImgArgumentException(_cimg_instance
                                        "draw_object3d() : Undefined texture for line primitive [%u].",
                                        cimg_instance,n_primitive);
          const unsigned int
            n0 = (unsigned int)primitive[0],
            n1 = (unsigned int)primitive[1],
            tx0 = (unsigned int)primitive[2],
            ty0 = (unsigned int)primitive[3],
            tx1 = (unsigned int)primitive[4],
            ty1 = (unsigned int)primitive[5];
          const int
            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1);
          const float
            z0 = vertices(n0,2) + Z + _focale,
            z1 = vertices(n1,2) + Z + _focale;
          if (render_type) {
            if (zbuffer) draw_line(zbuffer,x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opac);
            else draw_line(x0,y0,x1,y1,color,tx0,ty0,tx1,ty1,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.drawLine((float)x0,height()-(float)y0,(float)x1,height()-(float)y1);
            }
#endif
          } else {
            draw_point(x0,y0,color.get_vector_at(tx0,ty0)._data,opac).
              draw_point(x1,y1,color.get_vector_at(tx1,ty1)._data,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.drawCircle((float)x0,height()-(float)y0,0);
              board.drawCircle((float)x1,height()-(float)y1,0);
            }
#endif
          }
        } break;
        case 3 : { // Colored triangle
          const unsigned int
            n0 = (unsigned int)primitive[0],
            n1 = (unsigned int)primitive[1],
            n2 = (unsigned int)primitive[2];
          const int
            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1),
            x2 = (int)projections(n2,0), y2 = (int)projections(n2,1);
          const float
            z0 = vertices(n0,2) + Z + _focale,
            z1 = vertices(n1,2) + Z + _focale,
            z2 = vertices(n2,2) + Z + _focale;
          switch (render_type) {
          case 0 :
            draw_point(x0,y0,pcolor,opac).draw_point(x1,y1,pcolor,opac).draw_point(x2,y2,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.drawCircle((float)x0,height()-(float)y0,0);
              board.drawCircle((float)x1,height()-(float)y1,0);
              board.drawCircle((float)x2,height()-(float)y2,0);
            }
#endif
            break;
          case 1 :
            if (zbuffer)
              draw_line(zbuffer,x0,y0,z0,x1,y1,z1,pcolor,opac).draw_line(zbuffer,x0,y0,z0,x2,y2,z2,pcolor,opac).
                draw_line(zbuffer,x1,y1,z1,x2,y2,z2,pcolor,opac);
            else
              draw_line(x0,y0,x1,y1,pcolor,opac).draw_line(x0,y0,x2,y2,pcolor,opac).
                draw_line(x1,y1,x2,y2,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.drawLine((float)x0,height()-(float)y0,(float)x1,height()-(float)y1);
              board.drawLine((float)x0,height()-(float)y0,(float)x2,height()-(float)y2);
              board.drawLine((float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
            }
#endif
            break;
          case 2 :
            if (zbuffer) draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,opac);
            else draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.fillTriangle((float)x0,height()-(float)y0,(float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
            }
#endif
            break;
          case 3 :
            if (zbuffer) draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,opac,lightprops(l));
            else _draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,opac,lightprops(l));
#ifdef cimg_use_board
            if (pboard) {
              const float lp = cimg::min(lightprops(l),1);
              board.setPenColorRGBi((unsigned char)(color[0]*lp),
                                     (unsigned char)(color[1]*lp),
                                     (unsigned char)(color[2]*lp),
                                     (unsigned char)(opac*255));
              board.fillTriangle((float)x0,height()-(float)y0,(float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
            }
#endif
            break;
          case 4 :
            if (zbuffer) draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,lightprops(n0),lightprops(n1),lightprops(n2),opac);
            else draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,lightprops(n0),lightprops(n1),lightprops(n2),opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi((unsigned char)(color[0]),
                                     (unsigned char)(color[1]),
                                     (unsigned char)(color[2]),
                                     (unsigned char)(opac*255));
              board.fillGouraudTriangle((float)x0,height()-(float)y0,lightprops(n0),
                                         (float)x1,height()-(float)y1,lightprops(n1),
                                         (float)x2,height()-(float)y2,lightprops(n2));
            }
#endif
            break;
          case 5 : {
            const unsigned int
              lx0 = (unsigned int)lightprops(n0,0), ly0 = (unsigned int)lightprops(n0,1),
              lx1 = (unsigned int)lightprops(n1,0), ly1 = (unsigned int)lightprops(n1,1),
              lx2 = (unsigned int)lightprops(n2,0), ly2 = (unsigned int)lightprops(n2,1);
            if (zbuffer) draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opac);
            else draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opac);
#ifdef cimg_use_board
            if (pboard) {
              const float
                l0 = light_texture((int)(light_texture.width()/2*(1+lightprops(n0,0))), (int)(light_texture.height()/2*(1+lightprops(n0,1)))),
                l1 = light_texture((int)(light_texture.width()/2*(1+lightprops(n1,0))), (int)(light_texture.height()/2*(1+lightprops(n1,1)))),
                l2 = light_texture((int)(light_texture.width()/2*(1+lightprops(n2,0))), (int)(light_texture.height()/2*(1+lightprops(n2,1))));
              board.setPenColorRGBi((unsigned char)(color[0]),
                                     (unsigned char)(color[1]),
                                     (unsigned char)(color[2]),
                                     (unsigned char)(opac*255));
              board.fillGouraudTriangle((float)x0,height()-(float)y0,l0,
                                         (float)x1,height()-(float)y1,l1,
                                         (float)x2,height()-(float)y2,l2);
            }
#endif
          } break;
          }
        } break;
        case 4 : { // Colored rectangle
          const unsigned int
            n0 = (unsigned int)primitive[0],
            n1 = (unsigned int)primitive[1],
            n2 = (unsigned int)primitive[2],
            n3 = (unsigned int)primitive[3];
          const int
            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1),
            x2 = (int)projections(n2,0), y2 = (int)projections(n2,1),
            x3 = (int)projections(n3,0), y3 = (int)projections(n3,1);
          const float
            z0 = vertices(n0,2) + Z + _focale,
            z1 = vertices(n1,2) + Z + _focale,
            z2 = vertices(n2,2) + Z + _focale,
            z3 = vertices(n3,2) + Z + _focale;
          switch (render_type) {
          case 0 :
            draw_point(x0,y0,pcolor,opac).draw_point(x1,y1,pcolor,opac).
              draw_point(x2,y2,pcolor,opac).draw_point(x3,y3,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.drawCircle((float)x0,height()-(float)y0,0);
              board.drawCircle((float)x1,height()-(float)y1,0);
              board.drawCircle((float)x2,height()-(float)y2,0);
              board.drawCircle((float)x3,height()-(float)y3,0);
            }
#endif
            break;
          case 1 :
            if (zbuffer)
              draw_line(zbuffer,x0,y0,z0,x1,y1,z1,pcolor,opac).draw_line(zbuffer,x1,y1,z1,x2,y2,z2,pcolor,opac).
                draw_line(zbuffer,x2,y2,z2,x3,y3,z3,pcolor,opac).draw_line(zbuffer,x3,y3,z3,x0,y0,z0,pcolor,opac);
            else
              draw_line(x0,y0,x1,y1,pcolor,opac).draw_line(x1,y1,x2,y2,pcolor,opac).
                draw_line(x2,y2,x3,y3,pcolor,opac).draw_line(x3,y3,x0,y0,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.drawLine((float)x0,height()-(float)y0,(float)x1,height()-(float)y1);
              board.drawLine((float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
              board.drawLine((float)x2,height()-(float)y2,(float)x3,height()-(float)y3);
              board.drawLine((float)x3,height()-(float)y3,(float)x0,height()-(float)y0);
            }
#endif
            break;
          case 2 :
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,opac).draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,pcolor,opac);
            else
              draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,opac).draw_triangle(x0,y0,x2,y2,x3,y3,pcolor,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(color[0],color[1],color[2],(unsigned char)(opac*255));
              board.fillTriangle((float)x0,height()-(float)y0,(float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
              board.fillTriangle((float)x0,height()-(float)y0,(float)x2,height()-(float)y2,(float)x3,height()-(float)y3);
            }
#endif
            break;
          case 3 :
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,opac,lightprops(l)).
                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,pcolor,opac,lightprops(l));
            else
              _draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,opac,lightprops(l)).
                _draw_triangle(x0,y0,x2,y2,x3,y3,pcolor,opac,lightprops(l));
#ifdef cimg_use_board
            if (pboard) {
              const float lp = cimg::min(lightprops(l),1);
              board.setPenColorRGBi((unsigned char)(color[0]*lp),
                                     (unsigned char)(color[1]*lp),
                                     (unsigned char)(color[2]*lp),(unsigned char)(opac*255));
              board.fillTriangle((float)x0,height()-(float)y0,(float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
              board.fillTriangle((float)x0,height()-(float)y0,(float)x2,height()-(float)y2,(float)x3,height()-(float)y3);
            }
#endif
            break;
          case 4 : {
            const float
              lightprop0 = lightprops(n0), lightprop1 = lightprops(n1),
              lightprop2 = lightprops(n2), lightprop3 = lightprops(n3);
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,lightprop0,lightprop1,lightprop2,opac).
                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,pcolor,lightprop0,lightprop2,lightprop3,opac);
            else
              draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,lightprop0,lightprop1,lightprop2,opac).
                draw_triangle(x0,y0,x2,y2,x3,y3,pcolor,lightprop0,lightprop2,lightprop3,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi((unsigned char)(color[0]),
                                     (unsigned char)(color[1]),
                                     (unsigned char)(color[2]),
                                     (unsigned char)(opac*255));
              board.fillGouraudTriangle((float)x0,height()-(float)y0,lightprop0,
                                         (float)x1,height()-(float)y1,lightprop1,
                                         (float)x2,height()-(float)y2,lightprop2);
              board.fillGouraudTriangle((float)x0,height()-(float)y0,lightprop0,
                                         (float)x2,height()-(float)y2,lightprop2,
                                         (float)x3,height()-(float)y3,lightprop3);
            }
#endif
          } break;
          case 5 : {
            const unsigned int
              lx0 = (unsigned int)lightprops(n0,0), ly0 = (unsigned int)lightprops(n0,1),
              lx1 = (unsigned int)lightprops(n1,0), ly1 = (unsigned int)lightprops(n1,1),
              lx2 = (unsigned int)lightprops(n2,0), ly2 = (unsigned int)lightprops(n2,1),
              lx3 = (unsigned int)lightprops(n3,0), ly3 = (unsigned int)lightprops(n3,1);
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,pcolor,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opac).
                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,pcolor,light_texture,lx0,ly0,lx2,ly2,lx3,ly3,opac);
            else
              draw_triangle(x0,y0,x1,y1,x2,y2,pcolor,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opac).
                draw_triangle(x0,y0,x2,y2,x3,y3,pcolor,light_texture,lx0,ly0,lx2,ly2,lx3,ly3,opac);
#ifdef cimg_use_board
            if (pboard) {
              const float
                l0 = light_texture((int)(light_texture.width()/2*(1+lx0)), (int)(light_texture.height()/2*(1+ly0))),
                l1 = light_texture((int)(light_texture.width()/2*(1+lx1)), (int)(light_texture.height()/2*(1+ly1))),
                l2 = light_texture((int)(light_texture.width()/2*(1+lx2)), (int)(light_texture.height()/2*(1+ly2))),
                l3 = light_texture((int)(light_texture.width()/2*(1+lx3)), (int)(light_texture.height()/2*(1+ly3)));
              board.setPenColorRGBi((unsigned char)(color[0]),
                                     (unsigned char)(color[1]),
                                     (unsigned char)(color[2]),
                                     (unsigned char)(opac*255));
              board.fillGouraudTriangle((float)x0,height()-(float)y0,l0,
                                         (float)x1,height()-(float)y1,l1,
                                         (float)x2,height()-(float)y2,l2);
              board.fillGouraudTriangle((float)x0,height()-(float)y0,l0,
                                         (float)x2,height()-(float)y2,l2,
                                         (float)x3,height()-(float)y3,l3);
            }
#endif
          } break;
          }
        } break;
        case 9 : { // Textured triangle
          if (!__color)
            throw CImgArgumentException(_cimg_instance
                                        "draw_object3d() : Undefined texture for triangle primitive [%u].",
                                        cimg_instance,n_primitive);
          const unsigned int
            n0 = (unsigned int)primitive[0],
            n1 = (unsigned int)primitive[1],
            n2 = (unsigned int)primitive[2],
            tx0 = (unsigned int)primitive[3],
            ty0 = (unsigned int)primitive[4],
            tx1 = (unsigned int)primitive[5],
            ty1 = (unsigned int)primitive[6],
            tx2 = (unsigned int)primitive[7],
            ty2 = (unsigned int)primitive[8];
          const int
            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1),
            x2 = (int)projections(n2,0), y2 = (int)projections(n2,1);
          const float
            z0 = vertices(n0,2) + Z + _focale,
            z1 = vertices(n1,2) + Z + _focale,
            z2 = vertices(n2,2) + Z + _focale;
          switch (render_type) {
          case 0 :
            draw_point(x0,y0,color.get_vector_at(tx0,ty0)._data,opac).
              draw_point(x1,y1,color.get_vector_at(tx1,ty1)._data,opac).
              draw_point(x2,y2,color.get_vector_at(tx2,ty2)._data,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.drawCircle((float)x0,height()-(float)y0,0);
              board.drawCircle((float)x1,height()-(float)y1,0);
              board.drawCircle((float)x2,height()-(float)y2,0);
            }
#endif
            break;
          case 1 :
            if (zbuffer)
              draw_line(zbuffer,x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opac).
                draw_line(zbuffer,x0,y0,z0,x2,y2,z2,color,tx0,ty0,tx2,ty2,opac).
                draw_line(zbuffer,x1,y1,z1,x2,y2,z2,color,tx1,ty1,tx2,ty2,opac);
            else
              draw_line(x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opac).
                draw_line(x0,y0,z0,x2,y2,z2,color,tx0,ty0,tx2,ty2,opac).
                draw_line(x1,y1,z1,x2,y2,z2,color,tx1,ty1,tx2,ty2,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.drawLine((float)x0,height()-(float)y0,(float)x1,height()-(float)y1);
              board.drawLine((float)x0,height()-(float)y0,(float)x2,height()-(float)y2);
              board.drawLine((float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
            }
#endif
            break;
          case 2 :
            if (zbuffer) draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opac);
            else draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.fillTriangle((float)x0,height()-(float)y0,(float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
            }
#endif
            break;
          case 3 :
            if (zbuffer) draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opac,lightprops(l));
            else draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opac,lightprops(l));
#ifdef cimg_use_board
            if (pboard) {
              const float lp = cimg::min(lightprops(l),1);
              board.setPenColorRGBi((unsigned char)(128*lp),
                                    (unsigned char)(128*lp),
                                    (unsigned char)(128*lp),
                                    (unsigned char)(opac*255));
              board.fillTriangle((float)x0,height()-(float)y0,(float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
            }
#endif
            break;
          case 4 :
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,lightprops(n0),lightprops(n1),lightprops(n2),opac);
            else
              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,lightprops(n0),lightprops(n1),lightprops(n2),opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.fillGouraudTriangle((float)x0,height()-(float)y0,lightprops(n0),
                                        (float)x1,height()-(float)y1,lightprops(n1),
                                        (float)x2,height()-(float)y2,lightprops(n2));
            }
#endif
            break;
          case 5 :
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,light_texture,
                            (unsigned int)lightprops(n0,0),(unsigned int)lightprops(n0,1),
                            (unsigned int)lightprops(n1,0),(unsigned int)lightprops(n1,1),
                            (unsigned int)lightprops(n2,0),(unsigned int)lightprops(n2,1),
                            opac);
            else
              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,light_texture,
                            (unsigned int)lightprops(n0,0),(unsigned int)lightprops(n0,1),
                            (unsigned int)lightprops(n1,0),(unsigned int)lightprops(n1,1),
                            (unsigned int)lightprops(n2,0),(unsigned int)lightprops(n2,1),
                            opac);
#ifdef cimg_use_board
            if (pboard) {
              const float
                l0 = light_texture((int)(light_texture.width()/2*(1+lightprops(n0,0))), (int)(light_texture.height()/2*(1+lightprops(n0,1)))),
                l1 = light_texture((int)(light_texture.width()/2*(1+lightprops(n1,0))), (int)(light_texture.height()/2*(1+lightprops(n1,1)))),
                l2 = light_texture((int)(light_texture.width()/2*(1+lightprops(n2,0))), (int)(light_texture.height()/2*(1+lightprops(n2,1))));
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.fillGouraudTriangle((float)x0,height()-(float)y0,l0,(float)x1,height()-(float)y1,l1,(float)x2,height()-(float)y2,l2);
            }
#endif
            break;
          }
        } break;
        case 12 : { // Textured quadrangle
          if (!__color)
            throw CImgArgumentException(_cimg_instance
                                        "draw_object3d() : Undefined texture for quadrangle primitive [%u].",
                                        cimg_instance,n_primitive);
          const unsigned int
            n0 = (unsigned int)primitive[0],
            n1 = (unsigned int)primitive[1],
            n2 = (unsigned int)primitive[2],
            n3 = (unsigned int)primitive[3],
            tx0 = (unsigned int)primitive[4],
            ty0 = (unsigned int)primitive[5],
            tx1 = (unsigned int)primitive[6],
            ty1 = (unsigned int)primitive[7],
            tx2 = (unsigned int)primitive[8],
            ty2 = (unsigned int)primitive[9],
            tx3 = (unsigned int)primitive[10],
            ty3 = (unsigned int)primitive[11];
          const int
            x0 = (int)projections(n0,0), y0 = (int)projections(n0,1),
            x1 = (int)projections(n1,0), y1 = (int)projections(n1,1),
            x2 = (int)projections(n2,0), y2 = (int)projections(n2,1),
            x3 = (int)projections(n3,0), y3 = (int)projections(n3,1);
          const float
            z0 = vertices(n0,2) + Z + _focale,
            z1 = vertices(n1,2) + Z + _focale,
            z2 = vertices(n2,2) + Z + _focale,
            z3 = vertices(n3,2) + Z + _focale;

          switch (render_type) {
          case 0 :
            draw_point(x0,y0,color.get_vector_at(tx0,ty0)._data,opac).
              draw_point(x1,y1,color.get_vector_at(tx1,ty1)._data,opac).
              draw_point(x2,y2,color.get_vector_at(tx2,ty2)._data,opac).
              draw_point(x3,y3,color.get_vector_at(tx3,ty3)._data,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.drawCircle((float)x0,height()-(float)y0,0);
              board.drawCircle((float)x1,height()-(float)y1,0);
              board.drawCircle((float)x2,height()-(float)y2,0);
              board.drawCircle((float)x3,height()-(float)y3,0);
            }
#endif
            break;
          case 1 :
            if (zbuffer)
              draw_line(zbuffer,x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opac).
                draw_line(zbuffer,x1,y1,z1,x2,y2,z2,color,tx1,ty1,tx2,ty2,opac).
                draw_line(zbuffer,x2,y2,z2,x3,y3,z3,color,tx2,ty2,tx3,ty3,opac).
                draw_line(zbuffer,x3,y3,z3,x0,y0,z0,color,tx3,ty3,tx0,ty0,opac);
            else
              draw_line(x0,y0,z0,x1,y1,z1,color,tx0,ty0,tx1,ty1,opac).
                draw_line(x1,y1,z1,x2,y2,z2,color,tx1,ty1,tx2,ty2,opac).
                draw_line(x2,y2,z2,x3,y3,z3,color,tx2,ty2,tx3,ty3,opac).
                draw_line(x3,y3,z3,x0,y0,z0,color,tx3,ty3,tx0,ty0,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.drawLine((float)x0,height()-(float)y0,(float)x1,height()-(float)y1);
              board.drawLine((float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
              board.drawLine((float)x2,height()-(float)y2,(float)x3,height()-(float)y3);
              board.drawLine((float)x3,height()-(float)y3,(float)x0,height()-(float)y0);
            }
#endif
            break;
          case 2 :
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opac).
                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,opac);
            else
              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opac).
                draw_triangle(x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.fillTriangle((float)x0,height()-(float)y0,(float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
              board.fillTriangle((float)x0,height()-(float)y0,(float)x2,height()-(float)y2,(float)x3,height()-(float)y3);
            }
#endif
            break;
          case 3 :
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opac,lightprops(l)).
                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,opac,lightprops(l));
            else
              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,opac,lightprops(l)).
                draw_triangle(x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,opac,lightprops(l));
#ifdef cimg_use_board
            if (pboard) {
              const float lp = cimg::min(lightprops(l),1);
              board.setPenColorRGBi((unsigned char)(128*lp),
                                     (unsigned char)(128*lp),
                                     (unsigned char)(128*lp),
                                     (unsigned char)(opac*255));
              board.fillTriangle((float)x0,height()-(float)y0,(float)x1,height()-(float)y1,(float)x2,height()-(float)y2);
              board.fillTriangle((float)x0,height()-(float)y0,(float)x2,height()-(float)y2,(float)x3,height()-(float)y3);
            }
#endif
            break;
          case 4 : {
            const float
              lightprop0 = lightprops(n0), lightprop1 = lightprops(n1),
              lightprop2 = lightprops(n2), lightprop3 = lightprops(n3);
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,lightprop0,lightprop1,lightprop2,opac).
                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,lightprop0,lightprop2,lightprop3,opac);
            else
              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,lightprop0,lightprop1,lightprop2,opac).
                draw_triangle(x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,lightprop0,lightprop2,lightprop3,opac);
#ifdef cimg_use_board
            if (pboard) {
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.fillGouraudTriangle((float)x0,height()-(float)y0,lightprop0,
                                         (float)x1,height()-(float)y1,lightprop1,
                                         (float)x2,height()-(float)y2,lightprop2);
              board.fillGouraudTriangle((float)x0,height()-(float)y0,lightprop0,
                                         (float)x2,height()-(float)y2,lightprop2,
                                         (float)x3,height()-(float)y3,lightprop3);
            }
#endif
          } break;
          case 5 : {
            const unsigned int
              lx0 = (unsigned int)lightprops(n0,0), ly0 = (unsigned int)lightprops(n0,1),
              lx1 = (unsigned int)lightprops(n1,0), ly1 = (unsigned int)lightprops(n1,1),
              lx2 = (unsigned int)lightprops(n2,0), ly2 = (unsigned int)lightprops(n2,1),
              lx3 = (unsigned int)lightprops(n3,0), ly3 = (unsigned int)lightprops(n3,1);
            if (zbuffer)
              draw_triangle(zbuffer,x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opac).
                draw_triangle(zbuffer,x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,light_texture,lx0,ly0,lx2,ly2,lx3,ly3,opac);
            else
              draw_triangle(x0,y0,z0,x1,y1,z1,x2,y2,z2,color,tx0,ty0,tx1,ty1,tx2,ty2,light_texture,lx0,ly0,lx1,ly1,lx2,ly2,opac).
                draw_triangle(x0,y0,z0,x2,y2,z2,x3,y3,z3,color,tx0,ty0,tx2,ty2,tx3,ty3,light_texture,lx0,ly0,lx2,ly2,lx3,ly3,opac);
#ifdef cimg_use_board
            if (pboard) {
              const float
                l0 = light_texture((int)(light_texture.width()/2*(1+lx0)), (int)(light_texture.height()/2*(1+ly0))),
                l1 = light_texture((int)(light_texture.width()/2*(1+lx1)), (int)(light_texture.height()/2*(1+ly1))),
                l2 = light_texture((int)(light_texture.width()/2*(1+lx2)), (int)(light_texture.height()/2*(1+ly2))),
                l3 = light_texture((int)(light_texture.width()/2*(1+lx3)), (int)(light_texture.height()/2*(1+ly3)));
              board.setPenColorRGBi(128,128,128,(unsigned char)(opac*255));
              board.fillGouraudTriangle((float)x0,height()-(float)y0,l0,
                                         (float)x1,height()-(float)y1,l1,
                                         (float)x2,height()-(float)y2,l2);
              board.fillGouraudTriangle((float)x0,height()-(float)y0,l0,
                                         (float)x2,height()-(float)y2,l2,
                                         (float)x3,height()-(float)y3,l3);
            }
#endif
          } break;
          }
        } break;
        }
      }
      return *this;
    }

    //@}
    //---------------------------
    //
    //! \name Data Input
    //@{
    //---------------------------

    //! Simple interface to select a shape from an image.
    /**
       \param selection  Array of 6 values containing the selection result
       \param feature_type Determine feature to select (0=point, 1=vector, 2=rectangle, 3=circle)
       \param disp       Display window used to make the selection
       \param XYZ        Initial XYZ position (for volumetric images only)
       \param color      Color of the shape selector.
    **/
    CImg<T>& select(CImgDisplay &disp,
                    const unsigned int feature_type=2, unsigned int *const XYZ=0) {
      return get_select(disp,feature_type,XYZ).move_to(*this);
    }

    //! Simple interface to select a shape from an image.
    CImg<T>& select(const char *const title,
                    const unsigned int feature_type=2, unsigned int *const XYZ=0) {
      return get_select(title,feature_type,XYZ).move_to(*this);
    }

    //! Simple interface to select a shape from an image.
    CImg<intT> get_select(CImgDisplay &disp,
                          const unsigned int feature_type=2, unsigned int *const XYZ=0) const {
      return _get_select(disp,0,feature_type,XYZ,0,0,0,true);
    }

    //! Simple interface to select a shape from an image.
    CImg<intT> get_select(const char *const title,
                          const unsigned int feature_type=2, unsigned int *const XYZ=0) const {
      CImgDisplay disp;
      return _get_select(disp,title,feature_type,XYZ,0,0,0,true);
    }

    CImg<intT> _get_select(CImgDisplay &disp, const char *const title,
                           const unsigned int feature_type, unsigned int *const XYZ,
                           const int origX, const int origY, const int origZ,
                           const bool reset_view3d=true) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "select() : Empty instance.",
                                    cimg_instance);

      if (!disp) {
        disp.assign(cimg_fitscreen(_width,_height,_depth),title?title:0,1);
        if (!title) disp.set_title("CImg<%s> (%ux%ux%ux%u)",pixel_type(),_width,_height,_depth,_spectrum);
      } else if (title) disp.set_title("%s",title);

      const unsigned int old_normalization = disp.normalization();
      bool old_is_resized = disp.is_resized();
      disp._normalization = 0;
      disp.show().set_key(0).set_wheel();

      unsigned char foreground_color[] = { 255,255,255 }, background_color[] = { 0,0,0 };

      int area = 0, starting_area = 0, clicked_area = 0, phase = 0,
        X0 = (int)((XYZ?XYZ[0]:_width/2)%_width), Y0 = (int)((XYZ?XYZ[1]:_height/2)%_height), Z0 = (int)((XYZ?XYZ[2]:_depth/2)%_depth),
        X1 =-1, Y1 = -1, Z1 = -1,
        X = -1, Y = -1, Z = -1, X3d = -1, Y3d = -1,
        oX = X, oY = Y, oZ = Z, oX3d = X3d, oY3d = -1;
      unsigned int old_button = 0, key = 0;

      bool shape_selected = false, text_down = false;
      static CImg<floatT> pose3d;
      static bool is_view3d = false;
      if (reset_view3d) { pose3d.assign(); is_view3d = false; }
      CImg<floatT> points3d, opacities3d, sel_opacities3d;
      CImgList<uintT> primitives3d, sel_primitives3d;
      CImgList<ucharT> colors3d, sel_colors3d;
      CImg<ucharT> visu, visu0, view3d;
      char text[1024] = { 0 };

      while (!key && !disp.is_closed() && !shape_selected) {

        // Handle mouse motion and selection
        oX = X; oY = Y; oZ = Z;
        int
          mx = disp.mouse_x(),
          my = disp.mouse_y();
        const int
          mX = mx<0?-1:mx*(width()+(depth()>1?depth():0))/disp.width(),
          mY = my<0?-1:my*(height()+(depth()>1?depth():0))/disp.height();
        area = 0;
        if (mX>=0 && mY>=0 && mX<width() && mY<height())  { area = 1; X = mX; Y = mY; Z = phase?Z1:Z0; }
        if (mX>=0 && mX<width() && mY>=height()) { area = 2; X = mX; Z = mY - _height; Y = phase?Y1:Y0; }
        if (mY>=0 && mX>=width() && mY<height()) { area = 3; Y = mY; Z = mX - _width; X = phase?X1:X0; }
        if (mX>=width() && mY>=height()) area = 4;
        if (disp.button()) { if (!clicked_area) clicked_area = area; } else clicked_area = 0;

        switch (key = disp.key()) {
#if cimg_OS!=2
        case cimg::keyCTRLRIGHT :
#endif
        case 0 : case cimg::keyCTRLLEFT : key = 0; break;
        case cimg::keyPAGEUP : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { disp.set_wheel(1); key = 0; } break;
        case cimg::keyPAGEDOWN : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { disp.set_wheel(-1); key = 0; } break;
        case cimg::keyD : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          disp.set_fullscreen(false).resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
                                            CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false).
            _is_resized = true;
          disp.set_key(key,false); key = 0; visu0.assign();
        } break;
        case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          disp.set_fullscreen(false).resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false)._is_resized = true;
          disp.set_key(key,false); key = 0; visu0.assign();
        } break;
        case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          disp.set_fullscreen(false).resize(cimg_fitscreen(_width,_height,_depth),false)._is_resized = true;
          disp.set_key(key,false); key = 0; visu0.assign();
        } break;
        case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          disp.resize(disp.screen_width(),disp.screen_height(),false).toggle_fullscreen()._is_resized = true;
          disp.set_key(key,false); key = 0; visu0.assign();
        } break;
        case cimg::keyV : is_view3d = !is_view3d; disp.set_key(key,false); key = 0; visu0.assign(); break;
        case cimg::keyS : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          static unsigned int snap_number = 0;
          char filename[32] = { 0 };
          std::FILE *file;
          do {
            cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.bmp",snap_number++);
            if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
          } while (file);
          if (visu0) {
            visu.draw_text(0,0," Saving snapshot... ",foreground_color,background_color,1,13).display(disp);
            visu0.save(filename);
            visu.draw_text(0,0," Snapshot '%s' saved. ",foreground_color,background_color,1,13,filename).display(disp);
          }
          disp.set_key(key,false); key = 0;
        } break;
        case cimg::keyO :
          if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            static unsigned int snap_number = 0;
            char filename[32] = { 0 };
            std::FILE *file;
            do {
#ifdef cimg_use_zlib
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.cimgz",snap_number++);
#else
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.cimg",snap_number++);
#endif
              if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
            } while (file);
            visu.draw_text(0,0," Saving instance... ",foreground_color,background_color,1,13).display(disp);
            save(filename);
            visu.draw_text(0,0," Instance '%s' saved. ",foreground_color,background_color,1,13,filename).display(disp);
            disp.set_key(key,false); key = 0;
          } break;
        }

        switch (area) {

        case 0 : // When mouse is out of image range.
          mx = my = X = Y = Z = -1;
          break;

        case 1 : case 2 : case 3 : // When mouse is over the XY,XZ or YZ projections.
          if (disp.button()&1 && phase<2 && clicked_area==area) { // When selection has been started (1st step).
            if (_depth>1 && (X1!=X || Y1!=Y || Z1!=Z)) visu0.assign();
            X1 = X; Y1 = Y; Z1 = Z;
          }
          if (!(disp.button()&1) && phase>=2 && clicked_area!=area) { // When selection is at 2nd step (for volumes).
            switch (starting_area) {
            case 1 : if (Z1!=Z) visu0.assign(); Z1 = Z; break;
            case 2 : if (Y1!=Y) visu0.assign(); Y1 = Y; break;
            case 3 : if (X1!=X) visu0.assign(); X1 = X; break;
            }
          }
          if (disp.button()&2 && clicked_area==area) { // When moving through the image/volume.
            if (phase) {
              if (_depth>1 && (X1!=X || Y1!=Y || Z1!=Z)) visu0.assign();
              X1 = X; Y1 = Y; Z1 = Z;
            } else {
              if (_depth>1 && (X0!=X || Y0!=Y || Z0!=Z)) visu0.assign();
              X0 = X; Y0 = Y; Z0 = Z;
            }
          }
          if (disp.button()&4) { // Reset positions.
            oX = X = X0; oY = Y = Y0; oZ = Z = Z0; phase = area = clicked_area = starting_area = 0; visu0.assign();
          }
          if (disp.wheel()) { // When moving through the slices of the volume (with mouse wheel).
            if (_depth>1 && !disp.is_keyCTRLLEFT() && !disp.is_keyCTRLRIGHT() && !disp.is_keySHIFTLEFT() && !disp.is_keySHIFTRIGHT() &&
                !disp.is_keyALT() && !disp.is_keyALTGR()) {
              switch (area) {
              case 1 :
                if (phase) Z = (Z1+=disp.wheel()); else Z = (Z0+=disp.wheel());
                visu0.assign(); break;
              case 2 :
                if (phase) Y = (Y1+=disp.wheel()); else Y = (Y0+=disp.wheel());
                visu0.assign(); break;
              case 3 :
                if (phase) X = (X1+=disp.wheel()); else X = (X0+=disp.wheel());
                visu0.assign(); break;
              }
              disp.set_wheel();
            } else key = ~0U;
          }
          if ((disp.button()&1)!=old_button) { // When left button has just been pressed or released.
            switch (phase) {
            case 0 :
              if (area==clicked_area) {
                X0 = X1 = X; Y0 = Y1 = Y; Z0 = Z1 = Z; starting_area = area; ++phase;
              } break;
            case 1 :
              if (area==starting_area) {
                X1 = X; Y1 = Y; Z1 = Z; ++phase;
              } else if (!(disp.button()&1)) { oX = X = X0; oY = Y = Y0; oZ = Z = Z0; phase = 0; visu0.assign(); }
              break;
            case 2 : ++phase; break;
            }
            old_button = disp.button()&1;
          }
          break;

        case 4 : // When mouse is over the 3d view.
          if (is_view3d && points3d) {
            X3d = mx - _width*disp.width()/(_width+(_depth>1?_depth:0));
            Y3d = my - _height*disp.height()/(_height+(_depth>1?_depth:0));
            if (oX3d<0) { oX3d = X3d; oY3d = Y3d; }
            if ((disp.button()&3)==3) { pose3d.assign(); view3d.assign(); oX3d = oY3d = X3d = Y3d = -1; } // Left + right buttons : reset.
            else if (disp.button()&1 && pose3d && (oX3d!=X3d || oY3d!=Y3d)) { // Left button : rotate.
              const float
                R = 0.45f*cimg::min(view3d._width,view3d._height),
                R2 = R*R,
                u0 = (float)(oX3d-view3d.width()/2),
                v0 = (float)(oY3d-view3d.height()/2),
                u1 = (float)(X3d-view3d.width()/2),
                v1 = (float)(Y3d-view3d.height()/2),
                n0 = (float)std::sqrt(u0*u0+v0*v0),
                n1 = (float)std::sqrt(u1*u1+v1*v1),
                nu0 = n0>R?(u0*R/n0):u0,
                nv0 = n0>R?(v0*R/n0):v0,
                nw0 = (float)std::sqrt(cimg::max(0,R2-nu0*nu0-nv0*nv0)),
                nu1 = n1>R?(u1*R/n1):u1,
                nv1 = n1>R?(v1*R/n1):v1,
                nw1 = (float)std::sqrt(cimg::max(0,R2-nu1*nu1-nv1*nv1)),
                u = nv0*nw1 - nw0*nv1,
                v = nw0*nu1 - nu0*nw1,
                w = nv0*nu1 - nu0*nv1,
                n = (float)std::sqrt(u*u+v*v+w*w),
                alpha = (float)std::asin(n/R2);
              pose3d.draw_image(CImg<floatT>::rotation_matrix(u,v,w,alpha)*pose3d.get_crop(0,0,2,2));
              view3d.assign();
            } else if (disp.button()&2 && pose3d && oY3d!=Y3d) {  // Right button : zoom.
              pose3d(3,2)-=(oY3d - Y3d)*1.5f; view3d.assign();
            }
            if (disp.wheel()) { // Wheel : zoom
              pose3d(3,2)-=disp.wheel()*15; view3d.assign(); disp.set_wheel();
            }
            if (disp.button()&4 && pose3d && (oX3d!=X3d || oY3d!=Y3d)) { // Middle button : shift.
              pose3d(3,0)-=oX3d - X3d; pose3d(3,1)-=oY3d - Y3d; view3d.assign();
            }
            oX3d = X3d; oY3d = Y3d;
          }
          mx = my = X = Y = Z = -1;
          break;
        }

        if (phase) {
          if (!feature_type) shape_selected = phase?true:false;
          else {
            if (_depth>1) shape_selected = (phase==3)?true:false;
            else shape_selected = (phase==2)?true:false;
          }
        }

        if (X0<0) X0 = 0; if (X0>=width()) X0 = width() - 1;
        if (Y0<0) Y0 = 0; if (Y0>=height()) Y0 = height() - 1;
        if (Z0<0) Z0 = 0; if (Z0>=depth()) Z0 = depth() - 1;
        if (X1<1) X1 = 0; if (X1>=width()) X1 = width() - 1;
        if (Y1<0) Y1 = 0; if (Y1>=height()) Y1 = height() - 1;
        if (Z1<0) Z1 = 0; if (Z1>=depth()) Z1 = depth() - 1;

        // Draw visualization image on the display
        if (oX!=X || oY!=Y || oZ!=Z || !visu0 || (_depth>1 && !view3d)) {

          if (!visu0) { // Create image of projected planes.
            CImg<Tuchar> tmp, tmp0;
            if (_depth!=1) {
              tmp0 = get_projections2d(phase?X1:X0,phase?Y1:Y0,phase?Z1:Z0);
              tmp = tmp0.get_channels(0,cimg::min(2U,_spectrum - 1));
            } else tmp = get_channels(0,cimg::min(2U,_spectrum - 1));
            switch (old_normalization) {
            case 0 : tmp.move_to(visu0); break;
            case 1 : tmp.normalize(0,255).move_to(visu0); break;
            case 2 : {
              const float m = disp._min, M = disp._max;
              ((tmp-=m)*=255.0f/(M-m>0?M-m:1)).move_to(visu0);
            }
            case 3 :
              if (cimg::type<T>::is_float()) (tmp.normalize(0,255)).move_to(visu0);
              else {
                const float m = (float)cimg::type<T>::min(), M = (float)cimg::type<T>::max();
                ((tmp-=m)*=255.0f/(M-m)).move_to(visu0);
              } break;
            }
            visu0.resize(disp);
            view3d.assign();
            points3d.assign();
          }

          if (is_view3d && _depth>1 && !view3d) { // Create 3d view for volumetric images.
            const unsigned int
              _x3d = (unsigned int)cimg::round((float)_width*visu0._width/(_width+_depth),1,1),
              _y3d = (unsigned int)cimg::round((float)_height*visu0._height/(_height+_depth),1,1),
              x3d = _x3d>=visu0._width?visu0._width-1:_x3d,
              y3d = _y3d>=visu0._height?visu0._height-1:_y3d;
            CImg<ucharT>(1,2,1,1,64,128).resize(visu0._width-x3d,visu0._height-y3d,1,visu0._spectrum,3).move_to(view3d);
            if (!points3d) {
              get_projections3d(primitives3d,colors3d,phase?X1:X0,phase?Y1:Y0,phase?Z1:Z0,true).move_to(points3d);
              points3d.append(CImg<floatT>(8,3,1,1,
                                           0,_width-1,_width-1,0,0,_width-1,_width-1,0,
                                           0,0,_height-1,_height-1,0,0,_height-1,_height-1,
                                           0,0,0,0,_depth-1,_depth-1,_depth-1,_depth-1),'x');
              CImg<uintT>::vector(12,13).move_to(primitives3d); CImg<uintT>::vector(13,14).move_to(primitives3d);
              CImg<uintT>::vector(14,15).move_to(primitives3d); CImg<uintT>::vector(15,12).move_to(primitives3d);
              CImg<uintT>::vector(16,17).move_to(primitives3d); CImg<uintT>::vector(17,18).move_to(primitives3d);
              CImg<uintT>::vector(18,19).move_to(primitives3d); CImg<uintT>::vector(19,16).move_to(primitives3d);
              CImg<uintT>::vector(12,16).move_to(primitives3d); CImg<uintT>::vector(13,17).move_to(primitives3d);
              CImg<uintT>::vector(14,18).move_to(primitives3d); CImg<uintT>::vector(15,19).move_to(primitives3d);
              colors3d.insert(12,CImg<ucharT>::vector(255,255,255));
              opacities3d.assign(primitives3d.width(),1,1,1,0.5f);
              if (!phase) {
                opacities3d[0] = opacities3d[1] = opacities3d[2] = 0.8f;
                sel_primitives3d.assign();
                sel_colors3d.assign();
                sel_opacities3d.assign();
              } else {
                if (feature_type==2) {
                  points3d.append(CImg<floatT>(8,3,1,1,
                                               X0,X1,X1,X0,X0,X1,X1,X0,
                                               Y0,Y0,Y1,Y1,Y0,Y0,Y1,Y1,
                                               Z0,Z0,Z0,Z0,Z1,Z1,Z1,Z1),'x');
                  sel_primitives3d.assign();
                  CImg<uintT>::vector(20,21).move_to(sel_primitives3d); CImg<uintT>::vector(21,22).move_to(sel_primitives3d);
                  CImg<uintT>::vector(22,23).move_to(sel_primitives3d); CImg<uintT>::vector(23,20).move_to(sel_primitives3d);
                  CImg<uintT>::vector(24,25).move_to(sel_primitives3d); CImg<uintT>::vector(25,26).move_to(sel_primitives3d);
                  CImg<uintT>::vector(26,27).move_to(sel_primitives3d); CImg<uintT>::vector(27,24).move_to(sel_primitives3d);
                  CImg<uintT>::vector(20,24).move_to(sel_primitives3d); CImg<uintT>::vector(21,25).move_to(sel_primitives3d);
                  CImg<uintT>::vector(22,26).move_to(sel_primitives3d); CImg<uintT>::vector(23,27).move_to(sel_primitives3d);
                } else {
                  points3d.append(CImg<floatT>(2,3,1,1,
                                               X0,X1,
                                               Y0,Y1,
                                               Z0,Z1),'x');
                  sel_primitives3d.assign(CImg<uintT>::vector(20,21));
                }
                sel_colors3d.assign(sel_primitives3d._width,CImg<ucharT>::vector(255,255,255));
                sel_opacities3d.assign(sel_primitives3d._width,1,1,1,0.8f);
              }
              points3d.shift_object3d(-0.5f*_width,-0.5f*_height,-0.5f*_depth).resize_object3d();
              points3d*=0.75f*cimg::min(view3d._width,view3d._height);
            }

            if (!pose3d) CImg<floatT>(4,3,1,1, 1,0,0,0, 0,1,0,0, 0,0,1,0).move_to(pose3d);
            CImg<floatT> zbuffer3d(view3d._width,view3d._height,1,1,0);
            const CImg<floatT> rotated_points3d = pose3d.get_crop(0,0,2,2)*points3d;
            if (sel_primitives3d)
              view3d.draw_object3d(pose3d(3,0) + 0.5f*view3d._width,
                                   pose3d(3,1) + 0.5f*view3d._height,
                                   pose3d(3,2),
                                   rotated_points3d,sel_primitives3d,sel_colors3d,sel_opacities3d,
                                   2,true,500,0,0,0,0,0,zbuffer3d);
            view3d.draw_object3d(pose3d(3,0) + 0.5f*view3d._width,
                                 pose3d(3,1) + 0.5f*view3d._height,
                                 pose3d(3,2),
                                 rotated_points3d,primitives3d,colors3d,opacities3d,
                                 2,true,500,0,0,0,0,0,zbuffer3d);
            visu0.draw_image(x3d,y3d,view3d);
          }
          visu = visu0;

          const int d = (_depth>1)?_depth:0;
          if (phase) switch (feature_type) {
          case 1 : {
            const int
              x0 = (int)((X0+0.5f)*disp.width()/(_width+d)),
              y0 = (int)((Y0+0.5f)*disp.height()/(_height+d)),
              x1 = (int)((X1+0.5f)*disp.width()/(_width+d)),
              y1 = (int)((Y1+0.5f)*disp.height()/(_height+d));
            visu.draw_arrow(x0,y0,x1,y1,background_color,0.9f,30,5,0x55555555).
              draw_arrow(x0,y0,x1,y1,foreground_color,0.9f,30,5,0xAAAAAAAA);
            if (d) {
              const int
                zx0 = (int)((_width+Z0+0.5f)*disp.width()/(_width+d)),
                zx1 = (int)((_width+Z1+0.5f)*disp.width()/(_width+d)),
                zy0 = (int)((_height+Z0+0.5f)*disp.height()/(_height+d)),
                zy1 = (int)((_height+Z1+0.5f)*disp.height()/(_height+d));
              visu.draw_arrow(zx0,y0,zx1,y1,foreground_color,0.9f,30,5,0x55555555).
                draw_arrow(x0,zy0,x1,zy1,foreground_color,0.9f,30,5,0x55555555).
                draw_arrow(zx0,y0,zx1,y1,foreground_color,0.9f,30,5,0xAAAAAAAA).
                draw_arrow(x0,zy0,x1,zy1,foreground_color,0.9f,30,5,0xAAAAAAAA);
            }
          } break;
          case 2 : {
            const int
              x0 = (X0<X1?X0:X1)*disp.width()/(_width+d),
              y0 = (Y0<Y1?Y0:Y1)*disp.height()/(_height+d),
              x1 = ((X0<X1?X1:X0)+1)*disp.width()/(_width+d)-1,
              y1 = ((Y0<Y1?Y1:Y0)+1)*disp.height()/(_height+d)-1;
            visu.draw_rectangle(x0,y0,x1,y1,background_color,0.2f).draw_rectangle(x0,y0,x1,y1,foreground_color,0.6f,0x55555555);
            if (d) {
              const int
                zx0 = (int)((_width+(Z0<Z1?Z0:Z1))*disp.width()/(_width+d)),
                zy0 = (int)((_height+(Z0<Z1?Z0:Z1))*disp.height()/(_height+d)),
                zx1 = (int)((_width+(Z0<Z1?Z1:Z0)+1)*disp.width()/(_width+d))-1,
                zy1 = (int)((_height+(Z0<Z1?Z1:Z0)+1)*disp.height()/(_height+d))-1;
              visu.draw_rectangle(zx0,y0,zx1,y1,background_color,0.2f).draw_rectangle(zx0,y0,zx1,y1,foreground_color,0.6f,0x55555555).
                draw_rectangle(x0,zy0,x1,zy1,background_color,0.2f).draw_rectangle(x0,zy0,x1,zy1,foreground_color,0.6f,0x55555555);
            }
          } break;
          case 3 : {
            const int
              x0 = X0*disp.width()/(_width+d),
              y0 = Y0*disp.height()/(_height+d),
              x1 = X1*disp.width()/(_width+d)-1,
              y1 = Y1*disp.height()/(_height+d)-1;
            visu.draw_ellipse(x0,y0,(float)cimg::abs(x1-x0),(float)cimg::abs(y1-y0),0,background_color,0.2f).
              draw_ellipse(x0,y0,(float)cimg::abs(x1-x0),(float)cimg::abs(y1-y0),0,foreground_color,0.6f,0x55555555);
            if (d) {
              const int
                zx0 = (int)((_width+Z0)*disp.width()/(_width+d)),
                zy0 = (int)((_height+Z0)*disp.height()/(_height+d)),
                zx1 = (int)((_width+Z1+1)*disp.width()/(_width+d))-1,
                zy1 = (int)((_height+Z1+1)*disp.height()/(_height+d))-1;
              visu.draw_ellipse(zx0,y0,(float)cimg::abs(zx1-zx0),(float)cimg::abs(y1-y0),0,background_color,0.2f).
                draw_ellipse(zx0,y0,(float)cimg::abs(zx1-zx0),(float)cimg::abs(y1-y0),0,foreground_color,0.6f,0x55555555).
                draw_ellipse(x0,zy0,(float)cimg::abs(x1-x0),(float)cimg::abs(zy1-zy0),0,background_color,0.2f).
                draw_ellipse(x0,zy0,(float)cimg::abs(x1-x0),(float)cimg::abs(zy1-zy0),0,foreground_color,0.6f,0x55555555);
            }
          } break;
          } else {
            const int
              x0 = X*disp.width()/(_width+d),
              y0 = Y*disp.height()/(_height+d),
              x1 = (X+1)*disp.width()/(_width+d)-1,
              y1 = (Y+1)*disp.height()/(_height+d)-1;
            if (x1-x0>=4 && y1-y0>=4) visu.draw_rectangle(x0,y0,x1,y1,background_color,0.2f).
                                        draw_rectangle(x0,y0,x1,y1,foreground_color,0.6f,~0U);
          }

          if (my>=0 && my<13) text_down = true; else if (my>=visu.height()-13) text_down = false;
          if (!feature_type || !phase) {
            if (X>=0 && Y>=0 && Z>=0 && X<width() && Y<height() && Z<depth()) {
              if (_depth>1) cimg_snprintf(text,sizeof(text)," Point (%d,%d,%d) = [ ",origX+X,origY+Y,origZ+Z);
              else cimg_snprintf(text,sizeof(text)," Point (%d,%d) = [ ",origX+X,origY+Y);
              char *ctext = text + std::strlen(text), *const ltext = text + 512;
              for (unsigned int c = 0; c<_spectrum && ctext<ltext; ++c) {
                cimg_snprintf(ctext,sizeof(text)/2,cimg::type<T>::format(),cimg::type<T>::format((*this)(X,Y,Z,c)));
                ctext = text + std::strlen(text);
                *(ctext++) = ' '; *ctext = 0;
              }
              std::strcpy(text + std::strlen(text),"] ");
            }
          } else switch (feature_type) {
          case 1 : {
            const double dX = (double)(X0 - X1), dY = (double)(Y0 - Y1), dZ = (double)(Z0 - Z1), norm = std::sqrt(dX*dX+dY*dY+dZ*dZ);
            if (_depth>1) cimg_snprintf(text,sizeof(text)," Vect (%d,%d,%d)-(%d,%d,%d), Norm = %g ",
                                        origX+X0,origY+Y0,origZ+Z0,origX+X1,origY+Y1,origZ+Z1,norm);
            else cimg_snprintf(text,sizeof(text)," Vect (%d,%d)-(%d,%d), Norm = %g ",
                               origX+X0,origY+Y0,origX+X1,origY+Y1,norm);
          } break;
          case 2 :
            if (_depth>1) cimg_snprintf(text,sizeof(text)," Box (%d,%d,%d)-(%d,%d,%d), Size = (%d,%d,%d) ",
                                        origX+(X0<X1?X0:X1),origY+(Y0<Y1?Y0:Y1),origZ+(Z0<Z1?Z0:Z1),
                                        origX+(X0<X1?X1:X0),origY+(Y0<Y1?Y1:Y0),origZ+(Z0<Z1?Z1:Z0),
                                        1+cimg::abs(X0-X1),1+cimg::abs(Y0-Y1),1+cimg::abs(Z0-Z1));
            else cimg_snprintf(text,sizeof(text)," Box (%d,%d)-(%d,%d), Size = (%d,%d) ",
                               origX+(X0<X1?X0:X1),origY+(Y0<Y1?Y0:Y1),origX+(X0<X1?X1:X0),origY+(Y0<Y1?Y1:Y0),
                               1+cimg::abs(X0-X1),1+cimg::abs(Y0-Y1));
            break;
          default :
            if (_depth>1) cimg_snprintf(text,sizeof(text)," Ellipse (%d,%d,%d)-(%d,%d,%d), Radii = (%d,%d,%d) ",
                                        origX+X0,origY+Y0,origZ+Z0,origX+X1,origY+Y1,origZ+Z1,
                                        1+cimg::abs(X0-X1),1+cimg::abs(Y0-Y1),1+cimg::abs(Z0-Z1));
            else cimg_snprintf(text,sizeof(text)," Ellipse (%d,%d)-(%d,%d), Radii = (%d,%d) ",
                               origX+X0,origY+Y0,origX+X1,origY+Y1,1+cimg::abs(X0-X1),1+cimg::abs(Y0-Y1));
            }
          if (phase || (mx>=0 && my>=0)) visu.draw_text(0,text_down?visu.height()-13:0,text,foreground_color,background_color,0.7f,13);
          disp.display(visu).wait();
        } else if (!shape_selected) disp.wait();
        if (disp.is_resized()) { disp.resize(false)._is_resized = false; old_is_resized = true; visu0.assign(); }
      }

      // Return result
      CImg<intT> res(1,6,1,1,-1);
      if (XYZ) { XYZ[0] = (unsigned int)X0; XYZ[1] = (unsigned int)Y0; XYZ[2] = (unsigned int)Z0; }
      if (shape_selected) {
        if (feature_type==2) {
          if (X0>X1) cimg::swap(X0,X1);
          if (Y0>Y1) cimg::swap(Y0,Y1);
          if (Z0>Z1) cimg::swap(Z0,Z1);
        }
        if (X1<0 || Y1<0 || Z1<0) X0 = Y0 = Z0 = X1 = Y1 = Z1 = -1;
        switch (feature_type) {
        case 1 : case 2 : res[3] = X1; res[4] = Y1; res[5] = Z1;
        default : res[0] = X0; res[1] = Y0; res[2] = Z0;
        }
      }
      disp.set_button();
      disp._normalization = old_normalization;
      disp._is_resized = old_is_resized;
      if (key!=~0U) disp.set_key(key);
      return res;
    }

    //! Select sub-graph in a graph.
    CImg<intT> get_select_graph(CImgDisplay &disp,
                                const unsigned int plot_type=1, const unsigned int vertex_type=1,
                                const char *const labelx=0, const double xmin=0, const double xmax=0,
                                const char *const labely=0, const double ymin=0, const double ymax=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "select_graph() : Empty instance.",
                                    cimg_instance);
      if (!disp) disp.assign(cimg_fitscreen(640,480,1),0,0).set_title("CImg<%s>",pixel_type());
      const unsigned int siz = _width*_height*_depth, old_normalization = disp.normalization();
      disp.show().set_button().set_wheel()._normalization = 0;

      double nymin = ymin, nymax = ymax, nxmin = xmin, nxmax = xmax;
      if (nymin==nymax) nymin = (Tfloat)min_max(nymax);
      if (nymin==nymax) { --nymin; ++nymax; }
      if (nxmin==nxmax && nxmin==0) { nxmin = 0; nxmax = siz - 1.0; }

      const unsigned char black[] = { 0, 0, 0 }, white[] = { 255, 255, 255 }, gray[] = { 220, 220, 220 };
      const unsigned char gray2[] = { 110, 110, 110 }, ngray[] = { 35, 35, 35 };
      static unsigned int odimv = 0;
      static CImg<ucharT> palette;
      if (odimv!=_spectrum) {
        odimv = _spectrum;
        palette = CImg<ucharT>(3,_spectrum,1,1,120).noise(70,1);
        if (_spectrum==1) { palette[0] = palette[1] = 120; palette[2] = 200; }
        else {
          palette(0,0) = 220; palette(1,0) = 10; palette(2,0) = 10;
          if (_spectrum>1) { palette(0,1) = 10; palette(1,1) = 220; palette(2,1) = 10; }
          if (_spectrum>2) { palette(0,2) = 10; palette(1,2) = 10; palette(2,2) = 220; }
        }
      }

      CImg<ucharT> visu0, visu, graph, text, axes;
      int x0 = -1, x1 = -1, y0 = -1, y1 = -1, omouse_x = -2, omouse_y = -2;
      const unsigned int one = plot_type==3?0:1;
      unsigned int okey = 0, obutton = 0;
      char message[1024] = { 0 };
      CImg_3x3(I,unsigned char);

      for (bool selected = false; !selected && !disp.is_closed() && !okey && !disp.wheel(); ) {
        const int mouse_x = disp.mouse_x(), mouse_y = disp.mouse_y();
        const unsigned int key = disp.key(), button = disp.button();

        // Generate graph representation.
        if (!visu0) {
          visu0.assign(disp.width(),disp.height(),1,3,220);
          const int gdimx = disp.width() - 32, gdimy = disp.height() - 32;
          if (gdimx>0 && gdimy>0) {
            graph.assign(gdimx,gdimy,1,3,255);
            if (siz<32) graph.draw_grid(gdimx/(float)(siz-one),gdimy/(float)(siz-one),0,0,false,true,black,0.2f,0x33333333,0x33333333);
            else graph.draw_grid(-10,-10,0,0,false,true,black,0.2f,0x33333333,0x33333333);
            cimg_forC(*this,c) graph.draw_graph(get_shared_channel(c),&palette(0,c),(plot_type!=3 || _spectrum==1)?1:0.6f,
                                                plot_type,vertex_type,nymax,nymin);

            axes.assign(gdimx,gdimy,1,1,0);
            const float
              dx = (float)cimg::abs(nxmax-nxmin), dy = (float)cimg::abs(nymax-nymin),
              px = (float)std::pow(10.0,(int)std::log10(dx)-2.0),
              py = (float)std::pow(10.0,(int)std::log10(dy)-2.0);
            const CImg<Tdouble>
              seqx = CImg<Tdouble>::sequence(1 + gdimx/60,nxmin,one?nxmax:nxmin+(nxmax-nxmin)*(siz+1)/siz).round(px),
              seqy = CImg<Tdouble>::sequence(1 + gdimy/60,nymax,nymin).round(py);
            axes.draw_axes(seqx,seqy,white);
            if (nymin>0) axes.draw_axis(seqx,gdimy-1,gray);
            if (nymax<0) axes.draw_axis(seqx,0,gray);
            if (nxmin>0) axes.draw_axis(0,seqy,gray);
            if (nxmax<0) axes.draw_axis(gdimx-1,seqy,gray);

            cimg_for3x3(axes,x,y,0,0,I,unsigned char)
              if (Icc) {
                if (Icc==255) cimg_forC(graph,c) graph(x,y,c) = 0;
                else cimg_forC(graph,c) graph(x,y,c) = (unsigned char)(2*graph(x,y,c)/3);
              }
              else if (Ipc || Inc || Icp || Icn || Ipp || Inn || Ipn || Inp) cimg_forC(graph,c) graph(x,y,c) = (graph(x,y,c)+255)/2;

            visu0.draw_image(16,16,graph);
            visu0.draw_line(15,15,16+gdimx,15,gray2).draw_line(16+gdimx,15,16+gdimx,16+gdimy,gray2).
              draw_line(16+gdimx,16+gdimy,15,16+gdimy,white).draw_line(15,16+gdimy,15,15,white);
          } else graph.assign();
          text.assign().draw_text(0,0,labelx?labelx:"X-axis",white,ngray,1,13).resize(-100,-100,1,3);
          visu0.draw_image((visu0.width()-text.width())/2,visu0.height()-14,~text);
          text.assign().draw_text(0,0,labely?labely:"Y-axis",white,ngray,1,13).rotate(-90).resize(-100,-100,1,3);
          visu0.draw_image(1,(visu0.height()-text.height())/2,~text);
          visu.assign();
        }

        // Generate and display current view.
        if (!visu) {
          visu.assign(visu0);
          if (graph && x0>=0 && x1>=0) {
            const int
              nx0 = x0<=x1?x0:x1,
              nx1 = x0<=x1?x1:x0,
              ny0 = y0<=y1?y0:y1,
              ny1 = y0<=y1?y1:y0,
              sx0 = 16 + nx0*(visu.width()-32)/(siz-one),
              sx1 = 15 + (nx1+1)*(visu.width()-32)/(siz-one),
              sy0 = 16 + ny0,
              sy1 = 16 + ny1;
            if (y0>=0 && y1>=0)
              visu.draw_rectangle(sx0,sy0,sx1,sy1,gray,0.5f).draw_rectangle(sx0,sy0,sx1,sy1,black,0.5f,0xCCCCCCCCU);
            else visu.draw_rectangle(sx0,0,sx1,visu.height()-17,gray,0.5f).
                   draw_line(sx0,16,sx0,visu.height()-17,black,0.5f,0xCCCCCCCCU).
                   draw_line(sx1,16,sx1,visu.height()-17,black,0.5f,0xCCCCCCCCU);
          }
          if (mouse_x>=16 && mouse_y>=16 && mouse_x<visu.width()-16 && mouse_y<visu.height()-16) {
            if (graph) visu.draw_line(mouse_x,16,mouse_x,visu.height()-17,black,0.5f,0x55555555U);
            const unsigned int x = (unsigned int)cimg::round((mouse_x-16.0f)*(siz-one)/(disp.width()-32),1,one?0:-1);
            const double cx = nxmin + x*(nxmax-nxmin)/(siz-1);
            if (_spectrum>=7)
              cimg_snprintf(message,sizeof(message),"Value[%u:%g] = ( %g %g %g ... %g %g %g )",x,cx,
                            (double)(*this)(x,0,0,0),(double)(*this)(x,0,0,1),(double)(*this)(x,0,0,2),
                            (double)(*this)(x,0,0,_spectrum-4),(double)(*this)(x,0,0,_spectrum-3),(double)(*this)(x,0,0,_spectrum-1));
            else {
              cimg_snprintf(message,sizeof(message),"Value[%u:%g] = ( ",x,cx);
              cimg_forC(*this,c) std::sprintf(message + std::strlen(message),"%g ",(double)(*this)(x,0,0,c));
              std::sprintf(message + std::strlen(message),")");
            }
            if (x0>=0 && x1>=0) {
              const unsigned int
                nx0 = x0<=x1?x0:x1,
                nx1 = x0<=x1?x1:x0,
                ny0 = y0<=y1?y0:y1,
                ny1 = y0<=y1?y1:y0;
              const double
                cx0 = nxmin + nx0*(nxmax-nxmin)/(siz-1),
                cx1 = nxmin + (nx1+one)*(nxmax-nxmin)/(siz-1),
                cy0 = nymax - ny0*(nymax-nymin)/(visu._height-32),
                cy1 = nymax - ny1*(nymax-nymin)/(visu._height-32);
              if (y0>=0 && y1>=0)
                std::sprintf(message + std::strlen(message)," - Range ( %u:%g, %g ) - ( %u:%g, %g )",x0,cx0,cy0,x1+one,cx1,cy1);
              else
                std::sprintf(message + std::strlen(message)," - Range [ %u:%g - %u:%g ]",x0,cx0,x1+one,cx1);
            }
            text.assign().draw_text(0,0,message,white,ngray,1,13).resize(-100,-100,1,3);
            visu.draw_image((visu.width()-text.width())/2,1,~text);
          }
          visu.display(disp);
        }

        // Test keys.
        switch (okey = key) {
#if cimg_OS!=2
        case cimg::keyCTRLRIGHT : case cimg::keySHIFTRIGHT :
#endif
        case cimg::keyCTRLLEFT : case cimg::keySHIFTLEFT : okey = 0; break;
        case cimg::keyD : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          disp.set_fullscreen(false).resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
                                            CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false).
            _is_resized = true;
          disp.set_key(key,false); okey = 0;
        } break;
        case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          disp.set_fullscreen(false).resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false)._is_resized = true;
          disp.set_key(key,false); okey = 0;
        } break;
        case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          disp.set_fullscreen(false).resize(cimg_fitscreen(640,480,1),false)._is_resized = true;
          disp.set_key(key,false); okey = 0;
        } break;
        case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          disp.resize(disp.screen_width(),disp.screen_height(),false).toggle_fullscreen()._is_resized = true;
          disp.set_key(key,false); okey = 0;
        } break;
        case cimg::keyS : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
          static unsigned int snap_number = 0;
          if (visu || visu0) {
            CImg<ucharT> &screen = visu?visu:visu0;
            char filename[32] = { 0 };
            std::FILE *file;
            do {
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.bmp",snap_number++);
              if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
            } while (file);
            (+screen).draw_text(0,0," Saving snapshot... ",black,gray,1,13).display(disp);
            screen.save(filename);
            screen.draw_text(0,0," Snapshot '%s' saved. ",black,gray,1,13,filename).display(disp);
          }
          disp.set_key(key,false); okey = 0;
        } break;
        case cimg::keyO : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            static unsigned int snap_number = 0;
            if (visu || visu0) {
              CImg<ucharT> &screen = visu?visu:visu0;
              char filename[32] = { 0 };
              std::FILE *file;
              do {
#ifdef cimg_use_zlib
                cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.cimgz",snap_number++);
#else
                cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.cimg",snap_number++);
#endif
                if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
              } while (file);
              (+screen).draw_text(0,0," Saving instance... ",black,gray,1,13).display(disp);
              save(filename);
              screen.draw_text(0,0," Instance '%s' saved. ",black,gray,1,13,filename).display(disp);
            }
            disp.set_key(key,false); okey = 0;
          } break;
        }

        // Handle mouse motion and mouse buttons
        if (obutton!=button || omouse_x!=mouse_x || omouse_y!=mouse_y) {
          visu.assign();
          if (disp.mouse_x()>=0 && disp.mouse_y()>=0) {
            const int
              mx = (mouse_x -16)*(int)(siz-one)/(disp.width()-32),
              cx = mx<0?0:(mx>=(int)(siz-one)?siz-1-one:mx),
              my = mouse_y - 16,
              cy = my<=0?0:(my>=(disp.height()-32)?(disp.height()-32):my);
            if (button&1) {
              if (!obutton) { x0 = cx; y0 = -1; } else { x1 = cx; y1 = -1; }
            }
            else if (button&2) {
              if (!obutton) { x0 = cx; y0 = cy; } else { x1 = cx; y1 = cy; }
            }
            else if (obutton) { x1 = x1>=0?cx:-1; y1 = y1>=0?cy:-1; selected = true; }
          } else if (!button && obutton) selected = true;
          obutton = button; omouse_x = mouse_x; omouse_y = mouse_y;
        }
        if (disp.is_resized()) { disp.resize(false); visu0.assign(); }
        if (visu && visu0) disp.wait();
      }

      disp._normalization = old_normalization;
      if (x1>=0 && x1<x0) cimg::swap(x0,x1);
      if (y1<y0) cimg::swap(y0,y1);
      disp.set_key(okey);
      return CImg<intT>(4,1,1,1,x0,y0,x1>=0?x1+(int)one:-1,y1);
    }

    //! Load an image from a file.
    /**
       \param filename is the name of the image file to load.
       \note The extension of \c filename defines the file format. If no filename
       extension is provided, CImg<T>::get_load() will try to load a .cimg file.
    **/
    CImg<T>& load(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load() : Specified filename is (null).",
                                    cimg_instance);

      const char *const ext = cimg::split_filename(filename);
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
#ifdef cimg_load_plugin
        cimg_load_plugin(filename);
#endif
#ifdef cimg_load_plugin1
        cimg_load_plugin1(filename);
#endif
#ifdef cimg_load_plugin2
        cimg_load_plugin2(filename);
#endif
#ifdef cimg_load_plugin3
        cimg_load_plugin3(filename);
#endif
#ifdef cimg_load_plugin4
        cimg_load_plugin4(filename);
#endif
#ifdef cimg_load_plugin5
        cimg_load_plugin5(filename);
#endif
#ifdef cimg_load_plugin6
        cimg_load_plugin6(filename);
#endif
#ifdef cimg_load_plugin7
        cimg_load_plugin7(filename);
#endif
#ifdef cimg_load_plugin8
        cimg_load_plugin8(filename);
#endif
        // ASCII formats
        if (!cimg::strcasecmp(ext,"asc")) load_ascii(filename);
        else if (!cimg::strcasecmp(ext,"dlm") ||
                 !cimg::strcasecmp(ext,"txt")) load_dlm(filename);

        // 2d binary formats
        else if (!cimg::strcasecmp(ext,"bmp")) load_bmp(filename);
        else if (!cimg::strcasecmp(ext,"jpg") ||
                 !cimg::strcasecmp(ext,"jpeg") ||
                 !cimg::strcasecmp(ext,"jpe") ||
                 !cimg::strcasecmp(ext,"jfif") ||
                 !cimg::strcasecmp(ext,"jif")) load_jpeg(filename);
        else if (!cimg::strcasecmp(ext,"png")) load_png(filename);
        else if (!cimg::strcasecmp(ext,"ppm") ||
                 !cimg::strcasecmp(ext,"pgm") ||
                 !cimg::strcasecmp(ext,"pnm")) load_pnm(filename);
        else if (!cimg::strcasecmp(ext,"pfm")) load_pfm(filename);
        else if (!cimg::strcasecmp(ext,"tif") ||
                 !cimg::strcasecmp(ext,"tiff")) load_tiff(filename);
        else if (!cimg::strcasecmp(ext,"exr")) load_exr(filename);
        else if (!cimg::strcasecmp(ext,"cr2") ||
                 !cimg::strcasecmp(ext,"crw") ||
                 !cimg::strcasecmp(ext,"dcr") ||
                 !cimg::strcasecmp(ext,"mrw") ||
                 !cimg::strcasecmp(ext,"nef") ||
                 !cimg::strcasecmp(ext,"orf") ||
                 !cimg::strcasecmp(ext,"pix") ||
                 !cimg::strcasecmp(ext,"ptx") ||
                 !cimg::strcasecmp(ext,"raf") ||
                 !cimg::strcasecmp(ext,"srf")) load_dcraw_external(filename);

        // 3d binary formats
        else if (!cimg::strcasecmp(ext,"dcm") ||
                 !cimg::strcasecmp(ext,"dicom")) load_medcon_external(filename);
        else if (!cimg::strcasecmp(ext,"hdr") ||
                 !cimg::strcasecmp(ext,"nii")) load_analyze(filename);
        else if (!cimg::strcasecmp(ext,"par") ||
                 !cimg::strcasecmp(ext,"rec")) load_parrec(filename);
        else if (!cimg::strcasecmp(ext,"mnc")) load_minc2(filename);
        else if (!cimg::strcasecmp(ext,"inr")) load_inr(filename);
        else if (!cimg::strcasecmp(ext,"pan")) load_pandore(filename);
        else if (!cimg::strcasecmp(ext,"cimg") ||
                 !cimg::strcasecmp(ext,"cimgz") ||
                 !*ext)  return load_cimg(filename);

        // Archive files
        else if (!cimg::strcasecmp(ext,"gz")) load_gzip_external(filename);

        // Image sequences
        else if (!cimg::strcasecmp(ext,"avi") ||
                 !cimg::strcasecmp(ext,"mov") ||
                 !cimg::strcasecmp(ext,"asf") ||
                 !cimg::strcasecmp(ext,"divx") ||
                 !cimg::strcasecmp(ext,"flv") ||
                 !cimg::strcasecmp(ext,"mpg") ||
                 !cimg::strcasecmp(ext,"m1v") ||
                 !cimg::strcasecmp(ext,"m2v") ||
                 !cimg::strcasecmp(ext,"m4v") ||
                 !cimg::strcasecmp(ext,"mjp") ||
                 !cimg::strcasecmp(ext,"mkv") ||
                 !cimg::strcasecmp(ext,"mpe") ||
                 !cimg::strcasecmp(ext,"movie") ||
                 !cimg::strcasecmp(ext,"ogm") ||
                 !cimg::strcasecmp(ext,"ogg") ||
                 !cimg::strcasecmp(ext,"qt") ||
                 !cimg::strcasecmp(ext,"rm") ||
                 !cimg::strcasecmp(ext,"vob") ||
                 !cimg::strcasecmp(ext,"wmv") ||
                 !cimg::strcasecmp(ext,"xvid") ||
                 !cimg::strcasecmp(ext,"mpeg")) load_ffmpeg(filename);
        else throw CImgIOException("CImg<%s>::load()",
                                   pixel_type());
      } catch (CImgException& e) {
        if (!cimg::strncasecmp(e.what(),"cimg::fopen()",13)) {
          cimg::exception_mode() = omode;
          throw CImgIOException(_cimg_instance
                                "load() : Failed to open file '%s'.",
                                cimg_instance,
                                filename);
        } else try {
          const char *const f_type = cimg::file_type(0,filename);
          if (!cimg::strcasecmp(f_type,"pnm")) load_pnm(filename);
          else if (!cimg::strcasecmp(f_type,"pfm")) load_pfm(filename);
          else if (!cimg::strcasecmp(f_type,"bmp")) load_bmp(filename);
          else if (!cimg::strcasecmp(f_type,"jpg")) load_jpeg(filename);
          else if (!cimg::strcasecmp(f_type,"pan")) load_pandore(filename);
          else if (!cimg::strcasecmp(f_type,"png")) load_png(filename);
          else if (!cimg::strcasecmp(f_type,"tif")) load_tiff(filename);
          else if (!cimg::strcasecmp(f_type,"inr")) load_inr(filename);
          else if (!cimg::strcasecmp(f_type,"dcm")) load_medcon_external(filename);
          else throw CImgIOException("CImg<%s>::load()",
                                     pixel_type());
        } catch (CImgException&) {
          try {
            load_other(filename);
          } catch (CImgException&) {
            throw CImgIOException(_cimg_instance
                                  "load() : Failed to recognize format of file '%s'.",
                                  cimg_instance,
                                  filename);
          }
        }
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    static CImg<T> get_load(const char *const filename) {
      return CImg<T>().load(filename);
    }

    //! Load an image from an ASCII file.
    CImg<T>& load_ascii(const char *const filename) {
      return _load_ascii(0,filename);
    }

    static CImg<T> get_load_ascii(const char *const filename) {
      return CImg<T>().load_ascii(filename);
    }

    //! Load an image from an ASCII file.
    CImg<T>& load_ascii(std::FILE *const file) {
      return _load_ascii(file,0);
    }

    static CImg<T> get_load_ascii(std::FILE *const file) {
      return CImg<T>().load_ascii(file);
    }

    CImg<T>& _load_ascii(std::FILE *const file, const char *const filename) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_ascii() : Specified filename is (null).",
                                    cimg_instance);

      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      char line[256] = { 0 };
      int err = std::fscanf(nfile,"%255[^\n]",line);
      unsigned int off, dx = 0, dy = 1, dz = 1, dc = 1;
      std::sscanf(line,"%u%*c%u%*c%u%*c%u",&dx,&dy,&dz,&dc);
      err = std::fscanf(nfile,"%*[^0-9.eE+-]");
      if (!dx || !dy || !dz || !dc) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_ascii() : Invalid ASCII header in file '%s', image dimensions are set to (%u,%u,%u,%u).",
                              cimg_instance,
                              filename?filename:"(FILE*)",dx,dy,dz,dc);
      }
      assign(dx,dy,dz,dc);
      const unsigned int siz = size();
      double val;
      T *ptr = _data;
      for (err = 1, off = 0; off<siz && err==1; ++off) {
        err = std::fscanf(nfile,"%lf%*[^0-9.eE+-]",&val);
        *(ptr++) = (T)val;
      }
      if (err!=1)
        cimg::warn(_cimg_instance
                   "load_ascii() : Only %u/%u values read from file '%s'.",
                   cimg_instance,
                   off-1,siz,filename?filename:"(FILE*)");

      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a DLM file.
    CImg<T>& load_dlm(const char *const filename) {
      return _load_dlm(0,filename);
    }

    static CImg<T> get_load_dlm(const char *const filename) {
      return CImg<T>().load_dlm(filename);
    }

    //! Load an image from a DLM file.
    CImg<T>& load_dlm(std::FILE *const file) {
      return _load_dlm(file,0);
    }

    static CImg<T> get_load_dlm(std::FILE *const file) {
      return CImg<T>().load_dlm(file);
    }

    CImg<T>& _load_dlm(std::FILE *const file, const char *const filename) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_dlm() : Specified filename is (null).",
                                    cimg_instance);

      std::FILE *const nfile = file?file:cimg::fopen(filename,"r");
      char delimiter[256] = { 0 }, tmp[256] = { 0 };
      unsigned int cdx = 0, dx = 0, dy = 0;
      int err = 0;
      double val;
      assign(256,256);
      while ((err = std::fscanf(nfile,"%lf%255[^0-9.+-]",&val,delimiter))>0) {
        if (err>0) (*this)(cdx++,dy) = (T)val;
        if (cdx>=_width) resize(3*_width/2,_height,1,1,0);
        char c = 0;
        if (!std::sscanf(delimiter,"%255[^\n]%c",tmp,&c) || c=='\n') {
          dx = cimg::max(cdx,dx);
          if (++dy>=_height) resize(_width,3*_height/2,1,1,0);
          cdx = 0;
        }
      }
      if (cdx && err==1) { dx = cdx; ++dy; }
      if (!dx || !dy) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_dlm() : Invalid DLM file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }
      resize(dx,dy,1,1,0);
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a BMP file.
    CImg<T>& load_bmp(const char *const filename) {
      return _load_bmp(0,filename);
    }

    static CImg<T> get_load_bmp(const char *const filename) {
      return CImg<T>().load_bmp(filename);
    }

    //! Load an image from a BMP file.
    CImg<T>& load_bmp(std::FILE *const file) {
      return _load_bmp(file,0);
    }

    static CImg<T> get_load_bmp(std::FILE *const file) {
      return CImg<T>().load_bmp(file);
    }

    CImg<T>& _load_bmp(std::FILE *const file, const char *const filename) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_bmp() : Specified filename is (null).",
                                    cimg_instance);

      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      unsigned char header[64] = { 0 };
      cimg::fread(header,54,nfile);
      if (*header!='B' || header[1]!='M') {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_bmp() : Invalid BMP file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }

      // Read header and pixel buffer
      int
        file_size = header[0x02] + (header[0x03]<<8) + (header[0x04]<<16) + (header[0x05]<<24),
        offset = header[0x0A] + (header[0x0B]<<8) + (header[0x0C]<<16) + (header[0x0D]<<24),
        dx = header[0x12] + (header[0x13]<<8) + (header[0x14]<<16) + (header[0x15]<<24),
        dy = header[0x16] + (header[0x17]<<8) + (header[0x18]<<16) + (header[0x19]<<24),
        compression = header[0x1E] + (header[0x1F]<<8) + (header[0x20]<<16) + (header[0x21]<<24),
        nb_colors = header[0x2E] + (header[0x2F]<<8) + (header[0x30]<<16) + (header[0x31]<<24),
        bpp = header[0x1C] + (header[0x1D]<<8);
      const int
        cimg_iobuffer = 12*1024*1024,
        dx_bytes = (bpp==1)?(dx/8+(dx%8?1:0)):((bpp==4)?(dx/2+(dx%2?1:0)):(dx*bpp/8)),
        align_bytes = (4-dx_bytes%4)%4,
        buf_size = cimg::min(cimg::abs(dy)*(dx_bytes + align_bytes),file_size - offset);

      CImg<intT> palette;
      if (bpp<16) { if (!nb_colors) nb_colors = 1<<bpp; } else nb_colors = 0;
      if (nb_colors) { palette.assign(nb_colors); cimg::fread(palette._data,nb_colors,nfile); }
      const int xoffset = offset - 54 - 4*nb_colors;
      if (xoffset>0) std::fseek(nfile,xoffset,SEEK_CUR);

      CImg<ucharT> buffer;
      if (buf_size<cimg_iobuffer) { buffer.assign(buf_size); cimg::fread(buffer._data,buf_size,nfile); }
      else buffer.assign(dx_bytes + align_bytes);
      unsigned char *ptrs = buffer;

      // Decompress buffer (if necessary)
      if (compression) {
        if (file)
          throw CImgIOException(_cimg_instance
                                "load_bmp() : Unable to load compressed data from '(*FILE)' inputs.",
                                cimg_instance);
        else return load_other(filename);
      }

      // Read pixel data
      assign(dx,cimg::abs(dy),1,3);
      switch (bpp) {
      case 1 : { // Monochrome
        for (int y = height()-1; y>=0; --y) {
          if (buf_size>=cimg_iobuffer) { cimg::fread(ptrs=buffer._data,dx_bytes,nfile); std::fseek(nfile,align_bytes,SEEK_CUR); }
          unsigned char mask = 0x80, val = 0;
          cimg_forX(*this,x) {
            if (mask==0x80) val = *(ptrs++);
            const unsigned char *col = (unsigned char*)(palette._data + (val&mask?1:0));
            (*this)(x,y,2) = (T)*(col++);
            (*this)(x,y,1) = (T)*(col++);
            (*this)(x,y,0) = (T)*(col++);
            mask = cimg::ror(mask);
          }
          ptrs+=align_bytes;
        }
      } break;
      case 4 : { // 16 colors
        for (int y = height()-1; y>=0; --y) {
          if (buf_size>=cimg_iobuffer) { cimg::fread(ptrs=buffer._data,dx_bytes,nfile); std::fseek(nfile,align_bytes,SEEK_CUR); }
          unsigned char mask = 0xF0, val = 0;
          cimg_forX(*this,x) {
            if (mask==0xF0) val = *(ptrs++);
            const unsigned char color = (unsigned char)((mask<16)?(val&mask):((val&mask)>>4));
            const unsigned char *col = (unsigned char*)(palette._data + color);
            (*this)(x,y,2) = (T)*(col++);
            (*this)(x,y,1) = (T)*(col++);
            (*this)(x,y,0) = (T)*(col++);
            mask = cimg::ror(mask,4);
          }
          ptrs+=align_bytes;
        }
      } break;
      case 8 : { //  256 colors
        for (int y = height()-1; y>=0; --y) {
          if (buf_size>=cimg_iobuffer) { cimg::fread(ptrs=buffer._data,dx_bytes,nfile); std::fseek(nfile,align_bytes,SEEK_CUR); }
          cimg_forX(*this,x) {
            const unsigned char *col = (unsigned char*)(palette._data + *(ptrs++));
            (*this)(x,y,2) = (T)*(col++);
            (*this)(x,y,1) = (T)*(col++);
            (*this)(x,y,0) = (T)*(col++);
          }
          ptrs+=align_bytes;
        }
      } break;
      case 16 : { // 16 bits colors
        for (int y = height()-1; y>=0; --y) {
          if (buf_size>=cimg_iobuffer) { cimg::fread(ptrs=buffer._data,dx_bytes,nfile); std::fseek(nfile,align_bytes,SEEK_CUR); }
          cimg_forX(*this,x) {
            const unsigned char c1 = *(ptrs++), c2 = *(ptrs++);
            const unsigned short col = (unsigned short)(c1|(c2<<8));
            (*this)(x,y,2) = (T)(col&0x1F);
            (*this)(x,y,1) = (T)((col>>5)&0x1F);
            (*this)(x,y,0) = (T)((col>>10)&0x1F);
          }
          ptrs+=align_bytes;
        }
      } break;
      case 24 : { // 24 bits colors
        for (int y = height()-1; y>=0; --y) {
          if (buf_size>=cimg_iobuffer) { cimg::fread(ptrs=buffer._data,dx_bytes,nfile); std::fseek(nfile,align_bytes,SEEK_CUR); }
          cimg_forX(*this,x) {
            (*this)(x,y,2) = (T)*(ptrs++);
            (*this)(x,y,1) = (T)*(ptrs++);
            (*this)(x,y,0) = (T)*(ptrs++);
          }
          ptrs+=align_bytes;
        }
      } break;
      case 32 : { // 32 bits colors
        for (int y = height()-1; y>=0; --y) {
          if (buf_size>=cimg_iobuffer) { cimg::fread(ptrs=buffer._data,dx_bytes,nfile); std::fseek(nfile,align_bytes,SEEK_CUR); }
          cimg_forX(*this,x) {
            (*this)(x,y,2) = (T)*(ptrs++);
            (*this)(x,y,1) = (T)*(ptrs++);
            (*this)(x,y,0) = (T)*(ptrs++);
            ++ptrs;
          }
          ptrs+=align_bytes;
        }
      } break;
      }
      if (dy<0) mirror('y');
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a JPEG file.
    CImg<T>& load_jpeg(const char *const filename) {
      return _load_jpeg(0,filename);
    }

    static CImg<T> get_load_jpeg(const char *const filename) {
      return CImg<T>().load_jpeg(filename);
    }

    //! Load an image from a JPEG file.
    CImg<T>& load_jpeg(std::FILE *const file) {
      return _load_jpeg(file,0);
    }

    static CImg<T> get_load_jpeg(std::FILE *const file) {
      return CImg<T>().load_jpeg(file);
    }

    // Custom error handler for libjpeg.
#ifdef cimg_use_jpeg
    struct _cimg_error_mgr {
      struct jpeg_error_mgr original;
      jmp_buf setjmp_buffer;
      char message[JMSG_LENGTH_MAX];
    };

    typedef struct _cimg_error_mgr *_cimg_error_ptr;

    METHODDEF(void) _cimg_jpeg_error_exit(j_common_ptr cinfo) {
      _cimg_error_ptr c_err = (_cimg_error_ptr) cinfo->err;  // Return control to the setjmp point
      (*cinfo->err->format_message)(cinfo,c_err->message);
      jpeg_destroy(cinfo);  // Clean memory and temp files.
      longjmp(c_err->setjmp_buffer,1);
    }
#endif

    CImg<T>& _load_jpeg(std::FILE *const file, const char *const filename) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_jpeg() : Specified filename is (null).",
                                    cimg_instance);

#ifndef cimg_use_jpeg
      if (file)
        throw CImgIOException(_cimg_instance
                              "load_jpeg() : Unable to load data from '(FILE*)' unless libjpeg is enabled.",
                              cimg_instance);
      else return load_other(filename);
#else

      struct jpeg_decompress_struct cinfo;
      struct _cimg_error_mgr jerr;
      cinfo.err = jpeg_std_error(&jerr.original);
      jerr.original.error_exit = _cimg_jpeg_error_exit;

      if (setjmp(jerr.setjmp_buffer)) { // JPEG error
        throw CImgIOException(_cimg_instance
                             "load_jpeg() : Error message returned by libjpeg : %s.",
                             cimg_instance,jerr.message);
      }

      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      jpeg_create_decompress(&cinfo);
      jpeg_stdio_src(&cinfo,nfile);
      jpeg_read_header(&cinfo,TRUE);
      jpeg_start_decompress(&cinfo);

      if (cinfo.output_components!=1 && cinfo.output_components!=3 && cinfo.output_components!=4) {
        if (!file) return load_other(filename);
        else
          throw CImgIOException(_cimg_instance
                                "load_jpeg() : Failed to load JPEG data from file '%s'.",
                                cimg_instance,filename?filename:"(FILE*)");
      }
      CImg<ucharT> buffer(cinfo.output_width*cinfo.output_components);
      JSAMPROW row_pointer[1];
      assign(cinfo.output_width,cinfo.output_height,1,cinfo.output_components);
      T *ptr_r = _data, *ptr_g = _data + _width*_height, *ptr_b = _data + 2*_width*_height, *ptr_a = _data + 3*_width*_height;
      while (cinfo.output_scanline<cinfo.output_height) {
        *row_pointer = buffer._data;
        if (jpeg_read_scanlines(&cinfo,row_pointer,1)!=1) {
          cimg::warn(_cimg_instance
                     "load_jpeg() : Incomplete data in file '%s'.",
                     cimg_instance,filename?filename:"(FILE*)");
          break;
        }
        const unsigned char *ptrs = buffer._data;
        switch (_spectrum) {
        case 1 : {
          cimg_forX(*this,x) *(ptr_r++) = (T)*(ptrs++);
        } break;
        case 3 : {
          cimg_forX(*this,x) {
            *(ptr_r++) = (T)*(ptrs++);
            *(ptr_g++) = (T)*(ptrs++);
            *(ptr_b++) = (T)*(ptrs++);
          }
        } break;
        case 4 : {
          cimg_forX(*this,x) {
            *(ptr_r++) = (T)*(ptrs++);
            *(ptr_g++) = (T)*(ptrs++);
            *(ptr_b++) = (T)*(ptrs++);
            *(ptr_a++) = (T)*(ptrs++);
          }
        } break;
        }
      }
      jpeg_finish_decompress(&cinfo);
      jpeg_destroy_decompress(&cinfo);
      if (!file) cimg::fclose(nfile);
      return *this;
#endif
    }

    //! Load an image from a file, using Magick++ library.
    // Added April/may 2006 by Christoph Hormann <chris_hormann@gmx.de>
    //   This is experimental code, not much tested, use with care.
    CImg<T>& load_magick(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_magick() : Specified filename is (null).",
                                    cimg_instance);

#ifdef cimg_use_magick
      Magick::Image image(filename);
      const unsigned int W = image.size().width(), H = image.size().height();
      switch (image.type()) {
      case Magick::PaletteMatteType :
      case Magick::TrueColorMatteType :
      case Magick::ColorSeparationType : {
        assign(W,H,1,4);
        T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2), *ptr_a = data(0,0,0,3);
        Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
        for (unsigned int off = W*H; off; --off) {
          *(ptr_r++) = (T)(pixels->red);
          *(ptr_g++) = (T)(pixels->green);
          *(ptr_b++) = (T)(pixels->blue);
          *(ptr_a++) = (T)(pixels->opacity);
          ++pixels;
        }
      } break;
      case Magick::PaletteType :
      case Magick::TrueColorType : {
        assign(W,H,1,3);
        T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
        Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
        for (unsigned int off = W*H; off; --off) {
          *(ptr_r++) = (T)(pixels->red);
          *(ptr_g++) = (T)(pixels->green);
          *(ptr_b++) = (T)(pixels->blue);
          ++pixels;
        }
      } break;
      case Magick::GrayscaleMatteType : {
        assign(W,H,1,2);
        T *ptr_r = data(0,0,0,0), *ptr_a = data(0,0,0,1);
        Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
        for (unsigned int off = W*H; off; --off) {
          *(ptr_r++) = (T)(pixels->red);
          *(ptr_a++) = (T)(pixels->opacity);
          ++pixels;
        }
      } break;
      default : {
        assign(W,H,1,1);
        T *ptr_r = data(0,0,0,0);
        Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
        for (unsigned int off = W*H; off; --off) {
          *(ptr_r++) = (T)(pixels->red);
          ++pixels;
        }
      }
      }
#else
      throw CImgIOException(_cimg_instance
                            "load_magick() : Unable to load file '%s' unless libMagick++ is enabled.",
                            cimg_instance,
                            filename);
#endif
      return *this;
    }

    static CImg<T> get_load_magick(const char *const filename) {
      return CImg<T>().load_magick(filename);
    }

    //! Load an image from a PNG file.
    CImg<T>& load_png(const char *const filename) {
      return _load_png(0,filename);
    }

    static CImg<T> get_load_png(const char *const filename) {
      return CImg<T>().load_png(filename);
    }

    //! Load an image from a PNG file.
    CImg<T>& load_png(std::FILE *const file) {
      return _load_png(file,0);
    }

    static CImg<T> get_load_png(std::FILE *const file) {
      return CImg<T>().load_png(file);
    }

    // (Note : Most of this function has been written by Eric Fausett)
    CImg<T>& _load_png(std::FILE *const file, const char *const filename) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_png() : Specified filename is (null).",
                                    cimg_instance);

#ifndef cimg_use_png
      if (file)
        throw CImgIOException(_cimg_instance
                              "load_png() : Unable to load data from '(FILE*)' unless libpng is enabled.",
                              cimg_instance);

      else return load_other(filename);
#else
      // Open file and check for PNG validity
      const char *volatile nfilename = filename; // two 'volatile' here to remove a g++ warning due to 'setjmp'.
      std::FILE *volatile nfile = file?file:cimg::fopen(nfilename,"rb");

      unsigned char pngCheck[8] = { 0 };
      cimg::fread(pngCheck,8,(std::FILE*)nfile);
      if (png_sig_cmp(pngCheck,0,8)) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_png() : Invalid PNG file '%s'.",
                              cimg_instance,
                              nfilename?nfilename:"(FILE*)");
      }

      // Setup PNG structures for read
      png_voidp user_error_ptr = 0;
      png_error_ptr user_error_fn = 0, user_warning_fn = 0;
      png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,user_error_ptr,user_error_fn,user_warning_fn);
      if (!png_ptr) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_png() : Failed to initialize 'png_ptr' structure for file '%s'.",
                              cimg_instance,
                              nfilename?nfilename:"(FILE*)");
      }
      png_infop info_ptr = png_create_info_struct(png_ptr);
      if (!info_ptr) {
        if (!file) cimg::fclose(nfile);
        png_destroy_read_struct(&png_ptr,(png_infopp)0,(png_infopp)0);
        throw CImgIOException(_cimg_instance
                              "load_png() : Failed to initialize 'info_ptr' structure for file '%s'.",
                              cimg_instance,
                              nfilename?nfilename:"(FILE*)");
      }
      png_infop end_info = png_create_info_struct(png_ptr);
      if (!end_info) {
        if (!file) cimg::fclose(nfile);
        png_destroy_read_struct(&png_ptr,&info_ptr,(png_infopp)0);
        throw CImgIOException(_cimg_instance
                              "load_png() : Failed to initialize 'end_info' structure for file '%s'.",
                              cimg_instance,
                              nfilename?nfilename:"(FILE*)");
      }

      // Error handling callback for png file reading
      if (setjmp(png_jmpbuf(png_ptr))) {
        if (!file) cimg::fclose((std::FILE*)nfile);
        png_destroy_read_struct(&png_ptr, &end_info, (png_infopp)0);
        throw CImgIOException(_cimg_instance
                              "load_png() : Encountered unknown fatal error in libpng for file '%s'.",
                              cimg_instance,
                              nfilename?nfilename:"(FILE*)");
      }
      png_init_io(png_ptr, nfile);
      png_set_sig_bytes(png_ptr, 8);

      // Get PNG Header Info up to data block
      png_read_info(png_ptr,info_ptr);
      png_uint_32 W, H;
      int bit_depth, color_type, interlace_type;
      bool is_gray = false;
      png_get_IHDR(png_ptr,info_ptr,&W,&H,&bit_depth,&color_type,&interlace_type,(int*)0,(int*)0);

      // Transforms to unify image data
      if (color_type==PNG_COLOR_TYPE_PALETTE) {
        png_set_palette_to_rgb(png_ptr);
        color_type = PNG_COLOR_TYPE_RGB;
        bit_depth = 8;
      }
      if (color_type==PNG_COLOR_TYPE_GRAY && bit_depth<8) {
        png_set_expand_gray_1_2_4_to_8(png_ptr);
        color_type = PNG_COLOR_TYPE_RGB;
        is_gray = true;
        bit_depth = 8;
      }
      if (png_get_valid(png_ptr,info_ptr,PNG_INFO_tRNS)) {
        png_set_tRNS_to_alpha(png_ptr);
        color_type |= PNG_COLOR_MASK_ALPHA;
      }
      if (color_type==PNG_COLOR_TYPE_GRAY || color_type==PNG_COLOR_TYPE_GRAY_ALPHA) {
        png_set_gray_to_rgb(png_ptr);
        color_type |= PNG_COLOR_MASK_COLOR;
        is_gray = true;
      }
      if (color_type==PNG_COLOR_TYPE_RGB)
        png_set_filler(png_ptr,0xffffU,PNG_FILLER_AFTER);

      png_read_update_info(png_ptr,info_ptr);
      if (bit_depth!=8 && bit_depth!=16) {
        if (!file) cimg::fclose(nfile);
        png_destroy_read_struct(&png_ptr,&end_info,(png_infopp)0);
        throw CImgIOException(_cimg_instance
                              "load_png() : Invalid bit depth %u in file '%s'.",
                              cimg_instance,
                              bit_depth,nfilename?nfilename:"(FILE*)");
      }
      const int byte_depth = bit_depth>>3;

      // Allocate Memory for Image Read
      png_bytep *const imgData = new png_bytep[H];
      for (unsigned int row = 0; row<H; ++row) imgData[row] = new png_byte[byte_depth*4*W];
      png_read_image(png_ptr,imgData);
      png_read_end(png_ptr,end_info);

      // Read pixel data
      if (color_type!=PNG_COLOR_TYPE_RGB && color_type!=PNG_COLOR_TYPE_RGB_ALPHA) {
        if (!file) cimg::fclose(nfile);
        png_destroy_read_struct(&png_ptr,&end_info,(png_infopp)0);
        throw CImgIOException(_cimg_instance
                              "load_png() : Invalid color coding type %u in file '%s'.",
                              cimg_instance,
                              color_type,nfilename?nfilename:"(FILE*)");
      }
      const bool is_alpha = (color_type==PNG_COLOR_TYPE_RGBA);
      assign(W,H,1,(is_gray?1:3) + (is_alpha?1:0));
      T
        *ptr_r = data(0,0,0,0),
        *ptr_g = is_gray?0:data(0,0,0,1),
        *ptr_b = is_gray?0:data(0,0,0,2),
        *ptr_a = !is_alpha?0:data(0,0,0,is_gray?1:3);
      switch (bit_depth) {
      case 8 : {
        cimg_forY(*this,y) {
          const unsigned char *ptrs = (unsigned char*)imgData[y];
          cimg_forX(*this,x) {
            *(ptr_r++) = (T)*(ptrs++);
            if (ptr_g) *(ptr_g++) = (T)*(ptrs++); else ++ptrs;
            if (ptr_b) *(ptr_b++) = (T)*(ptrs++); else ++ptrs;
            if (ptr_a) *(ptr_a++) = (T)*(ptrs++); else ++ptrs;
          }
        }
      } break;
      case 16 : {
        cimg_forY(*this,y) {
          const unsigned short *ptrs = (unsigned short*)(imgData[y]);
          if (!cimg::endianness()) cimg::invert_endianness(ptrs,4*_width);
          cimg_forX(*this,x) {
            *(ptr_r++) = (T)*(ptrs++);
            if (ptr_g) *(ptr_g++) = (T)*(ptrs++); else ++ptrs;
            if (ptr_b) *(ptr_b++) = (T)*(ptrs++); else ++ptrs;
            if (ptr_a) *(ptr_a++) = (T)*(ptrs++); else ++ptrs;
          }
        }
      } break;
      }
      png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);

      // Deallocate Image Read Memory
      cimg_forY(*this,n) delete[] imgData[n];
      delete[] imgData;
      if (!file) cimg::fclose(nfile);
      return *this;
#endif
    }

    //! Load an image from a PNM file.
    CImg<T>& load_pnm(const char *const filename) {
      return _load_pnm(0,filename);
    }

    static CImg<T> get_load_pnm(const char *const filename) {
      return CImg<T>().load_pnm(filename);
    }

    //! Load an image from a PNM file.
    CImg<T>& load_pnm(std::FILE *const file) {
      return _load_pnm(file,0);
    }

    static CImg<T> get_load_pnm(std::FILE *const file) {
      return CImg<T>().load_pnm(file);
    }

    CImg<T>& _load_pnm(std::FILE *const file, const char *const filename) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_pnm() : Specified filename is (null).",
                                    cimg_instance);

      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      unsigned int ppm_type, W, H, colormax = 255;
      char item[1024] = { 0 };
      int err, rval, gval, bval;
      const int cimg_iobuffer = 12*1024*1024;
      while ((err=std::fscanf(nfile,"%1023[^\n]",item))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
      if (std::sscanf(item," P%u",&ppm_type)!=1) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_pnm() : PNM header not found in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }
      while ((err=std::fscanf(nfile," %1023[^\n]",item))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
      if ((err=std::sscanf(item," %u %u %u",&W,&H,&colormax))<2) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_pnm() : WIDTH and HEIGHT fields undefined in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }
      if (err==2) {
        while ((err=std::fscanf(nfile," %1023[^\n]",item))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
        if (std::sscanf(item,"%u",&colormax)!=1)
          cimg::warn(_cimg_instance
                     "load_pnm() : COLORMAX field is undefined in file '%s'.",
                     cimg_instance,
                     filename?filename:"(FILE*)");
      }
      std::fgetc(nfile);

      switch (ppm_type) {
      case 2 : { // Grey Ascii
        assign(W,H,1,1);
        T* ptr_r = _data;
        cimg_foroff(*this,off) { if (std::fscanf(nfile,"%d",&rval)>0) *(ptr_r++) = (T)rval; else break; }
      } break;
      case 3 : { // Color Ascii
        assign(W,H,1,3);
        T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
        cimg_forXY(*this,x,y) {
          if (std::fscanf(nfile,"%d %d %d",&rval,&gval,&bval)==3) { *(ptr_r++) = (T)rval; *(ptr_g++) = (T)gval; *(ptr_b++) = (T)bval; }
          else break;
        }
      } break;
      case 5 : { // Grey Binary
        if (colormax<256) { // 8 bits
          CImg<ucharT> raw;
          assign(W,H,1,1);
          T *ptrd = data(0,0,0,0);
          for (int toread = (int)size(); toread>0; ) {
            raw.assign(cimg::min(toread,cimg_iobuffer));
            cimg::fread(raw._data,raw._width,nfile);
            toread-=raw._width;
            const unsigned char *ptrs = raw._data;
            for (unsigned int off = raw._width; off; --off) *(ptrd++) = (T)*(ptrs++);
          }
        } else { // 16 bits
          CImg<ushortT> raw;
          assign(W,H,1,1);
          T *ptrd = data(0,0,0,0);
          for (int toread = (int)size(); toread>0; ) {
            raw.assign(cimg::min(toread,cimg_iobuffer/2));
            cimg::fread(raw._data,raw._width,nfile);
            if (!cimg::endianness()) cimg::invert_endianness(raw._data,raw._width);
            toread-=raw._width;
            const unsigned short *ptrs = raw._data;
            for (unsigned int off = raw._width; off; --off) *(ptrd++) = (T)*(ptrs++);
          }
        }
      } break;
      case 6 : { // Color Binary
        if (colormax<256) { // 8 bits
          CImg<ucharT> raw;
          assign(W,H,1,3);
          T
            *ptr_r = data(0,0,0,0),
            *ptr_g = data(0,0,0,1),
            *ptr_b = data(0,0,0,2);
          for (int toread = (int)size(); toread>0; ) {
            raw.assign(cimg::min(toread,cimg_iobuffer));
            cimg::fread(raw._data,raw._width,nfile);
            toread-=raw._width;
            const unsigned char *ptrs = raw._data;
            for (unsigned int off = raw._width/3; off; --off) {
              *(ptr_r++) = (T)*(ptrs++);
              *(ptr_g++) = (T)*(ptrs++);
              *(ptr_b++) = (T)*(ptrs++);
            }
          }
        } else { // 16 bits
          CImg<ushortT> raw;
          assign(W,H,1,3);
          T
            *ptr_r = data(0,0,0,0),
            *ptr_g = data(0,0,0,1),
            *ptr_b = data(0,0,0,2);
          for (int toread = (int)size(); toread>0; ) {
            raw.assign(cimg::min(toread,cimg_iobuffer/2));
            cimg::fread(raw._data,raw._width,nfile);
            if (!cimg::endianness()) cimg::invert_endianness(raw._data,raw._width);
            toread-=raw._width;
            const unsigned short *ptrs = raw._data;
            for (unsigned int off = raw._width/3; off; --off) {
              *(ptr_r++) = (T)*(ptrs++);
              *(ptr_g++) = (T)*(ptrs++);
              *(ptr_b++) = (T)*(ptrs++);
            }
          }
        }
      } break;
      default :
        assign();
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_pnm() : PNM type 'P%d' found, but type is not supported.",
                              cimg_instance,
                              filename?filename:"(FILE*)",ppm_type);
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a PFM file.
    CImg<T>& load_pfm(const char *const filename) {
      return _load_pfm(0,filename);
    }

    static CImg<T> get_load_pfm(const char *const filename) {
      return CImg<T>().load_pfm(filename);
    }

    //! Load an image from a PFM file.
    CImg<T>& load_pfm(std::FILE *const file) {
      return _load_pfm(file,0);
    }

    static CImg<T> get_load_pfm(std::FILE *const file) {
      return CImg<T>().load_pfm(file);
    }

    CImg<T>& _load_pfm(std::FILE *const file, const char *const filename) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_pfm() : Specified filename is (null).",
                                    cimg_instance);

      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      char pfm_type, item[1024] = { 0 };
      int W = 0, H = 0, err = 0;
      double scale = 0;
      while ((err=std::fscanf(nfile,"%1023[^\n]",item))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
      if (std::sscanf(item," P%c",&pfm_type)!=1) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_pfm() : PFM header not found in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }
      while ((err=std::fscanf(nfile," %1023[^\n]",item))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
      if ((err=std::sscanf(item," %d %d",&W,&H))<2) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_pfm() : WIDTH and HEIGHT fields are undefined in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }
      if (err==2) {
        while ((err=std::fscanf(nfile," %1023[^\n]",item))!=EOF && (*item=='#' || !err)) std::fgetc(nfile);
        if (std::sscanf(item,"%lf",&scale)!=1)
          cimg::warn(_cimg_instance
                     "load_pfm() : SCALE field is undefined in file '%s'.",
                     cimg_instance,
                     filename?filename:"(FILE*)");
      }
      std::fgetc(nfile);
      const bool is_color = (pfm_type=='F'), is_inverted = (scale>0)!=cimg::endianness();
      if (is_color) {
        assign(W,H,1,3,0);
        CImg<floatT> buf(3*W);
        T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
        cimg_forY(*this,y) {
          cimg::fread(buf._data,3*W,nfile);
          if (is_inverted) cimg::invert_endianness(buf._data,3*W);
          const float *ptrs = buf._data;
          cimg_forX(*this,x) {
            *(ptr_r++) = (T)*(ptrs++);
            *(ptr_g++) = (T)*(ptrs++);
            *(ptr_b++) = (T)*(ptrs++);
          }
        }
      } else {
        assign(W,H,1,1,0);
        CImg<floatT> buf(W);
        T *ptrd = data(0,0,0,0);
        cimg_forY(*this,y) {
          cimg::fread(buf._data,W,nfile);
          if (is_inverted) cimg::invert_endianness(buf._data,W);
          const float *ptrs = buf._data;
          cimg_forX(*this,x) *(ptrd++) = (T)*(ptrs++);
        }
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a RGB file.
    CImg<T>& load_rgb(const char *const filename, const unsigned int dimw, const unsigned int dimh=1) {
      return _load_rgb(0,filename,dimw,dimh);
    }

    static CImg<T> get_load_rgb(const char *const filename, const unsigned int dimw, const unsigned int dimh=1) {
      return CImg<T>().load_rgb(filename,dimw,dimh);
    }

    //! Load an image from a RGB file.
    CImg<T>& load_rgb(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {
      return _load_rgb(file,0,dimw,dimh);
    }

    static CImg<T> get_load_rgb(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {
      return CImg<T>().load_rgb(file,dimw,dimh);
    }

    CImg<T>& _load_rgb(std::FILE *const file, const char *const filename, const unsigned int dimw, const unsigned int dimh) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_rgb() : Specified filename is (null).",
                                    cimg_instance);

      if (!dimw || !dimh) return assign();
      const int cimg_iobuffer = 12*1024*1024;
      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      CImg<ucharT> raw;
      assign(dimw,dimh,1,3);
      T
        *ptr_r = data(0,0,0,0),
        *ptr_g = data(0,0,0,1),
        *ptr_b = data(0,0,0,2);
      for (int toread = (int)size(); toread>0; ) {
        raw.assign(cimg::min(toread,cimg_iobuffer));
        cimg::fread(raw._data,raw._width,nfile);
        toread-=raw._width;
        const unsigned char *ptrs = raw._data;
        for (unsigned int off = raw._width/3; off; --off) {
          *(ptr_r++) = (T)*(ptrs++);
          *(ptr_g++) = (T)*(ptrs++);
          *(ptr_b++) = (T)*(ptrs++);
        }
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a RGBA file.
    CImg<T>& load_rgba(const char *const filename, const unsigned int dimw, const unsigned int dimh=1) {
      return _load_rgba(0,filename,dimw,dimh);
    }

    static CImg<T> get_load_rgba(const char *const filename, const unsigned int dimw, const unsigned int dimh=1) {
      return CImg<T>().load_rgba(filename,dimw,dimh);
    }

    //! Load an image from a RGBA file.
    CImg<T>& load_rgba(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {
      return _load_rgba(file,0,dimw,dimh);
    }

    static CImg<T> get_load_rgba(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {
      return CImg<T>().load_rgba(file,dimw,dimh);
    }

    CImg<T>& _load_rgba(std::FILE *const file, const char *const filename, const unsigned int dimw, const unsigned int dimh) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_rgba() : Specified filename is (null).",
                                    cimg_instance);

      if (!dimw || !dimh) return assign();
      const int cimg_iobuffer = 12*1024*1024;
      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      CImg<ucharT> raw;
      assign(dimw,dimh,1,4);
      T
        *ptr_r = data(0,0,0,0),
        *ptr_g = data(0,0,0,1),
        *ptr_b = data(0,0,0,2),
        *ptr_a = data(0,0,0,3);
      for (int toread = (int)size(); toread>0; ) {
        raw.assign(cimg::min(toread,cimg_iobuffer));
        cimg::fread(raw._data,raw._width,nfile);
        toread-=raw._width;
        const unsigned char *ptrs = raw._data;
        for (unsigned int off = raw._width/4; off; --off) {
          *(ptr_r++) = (T)*(ptrs++);
          *(ptr_g++) = (T)*(ptrs++);
          *(ptr_b++) = (T)*(ptrs++);
          *(ptr_a++) = (T)*(ptrs++);
        }
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a TIFF file.
    /**
       - libtiff support is enabled by defining the precompilation
        directive cimg_use_tif.

       - When libtiff is enabled, 2D and 3D (multipage) several
        channel per pixel are supported for
        char,uchar,short,ushort,float and double pixel type.

       - If cimg_use_tif is not defined at compilation time the
        function uses CImg<T>&load_other(const char*).

       \see CImg<T>& load_other(const char*)
       \see CImg<T>& save_tiff(const char*, const unsigned int)
     **/
    CImg<T>& load_tiff(const char *const filename,
                       const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                       const unsigned int step_frame=1) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_tiff() : Specified filename is (null).",
                                    cimg_instance);

      const unsigned int
        nfirst_frame = first_frame<last_frame?first_frame:last_frame,
        nstep_frame = step_frame?step_frame:1;
      unsigned int nlast_frame = first_frame<last_frame?last_frame:first_frame;

#ifndef cimg_use_tiff
      if (nfirst_frame || nlast_frame!=~0U || nstep_frame>1)
        throw CImgArgumentException(_cimg_instance
                                    "load_tiff() : Unable to read sub-images from file '%s' unless libtiff is enabled.",
                                    cimg_instance,
                                    filename);
      return load_other(filename);
#else
      TIFF *tif = TIFFOpen(filename,"r");
      if (tif) {
        unsigned int nb_images = 0;
        do ++nb_images; while (TIFFReadDirectory(tif));
        if (nfirst_frame>=nb_images || (nlast_frame!=~0U && nlast_frame>=nb_images))
          cimg::warn(_cimg_instance
                     "load_tiff() : File '%s' contains %u image(s) while specified frame range is [%u,%u] (step %u).",
                     cimg_instance,
                     filename,nb_images,nfirst_frame,nlast_frame,nstep_frame);

        if (nfirst_frame>=nb_images) return assign();
        if (nlast_frame>=nb_images) nlast_frame = nb_images-1;
        TIFFSetDirectory(tif,0);
        CImg<T> frame;
        for (unsigned int l = nfirst_frame; l<=nlast_frame; l+=nstep_frame) {
          frame._load_tiff(tif,l);
          if (l==nfirst_frame) assign(frame._width,frame._height,1+(nlast_frame-nfirst_frame)/nstep_frame,frame._spectrum);
          if (frame._width>_width || frame._height>_height || frame._spectrum>_spectrum)
            resize(cimg::max(frame._width,_width),cimg::max(frame._height,_height),-100,cimg::max(frame._spectrum,_spectrum),0);
          draw_image(0,0,(l-nfirst_frame)/nstep_frame,frame);
        }
        TIFFClose(tif);
      } else throw CImgException(_cimg_instance
                                 "load_tiff() : Failed to open file '%s'.",
                                 cimg_instance,
                                 filename);
      return *this;
#endif
    }

    static CImg<T> get_load_tiff(const char *const filename,
                                 const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                 const unsigned int step_frame=1) {
      return CImg<T>().load_tiff(filename,first_frame,last_frame,step_frame);
    }

    // (Original contribution by Jerome Boulanger).
#ifdef cimg_use_tiff
    template<typename t>
    void _load_tiff_tiled_contig(TIFF *const tif, const uint16 samplesperpixel, const uint32 nx, const uint32 ny, const uint32 tw, const uint32 th) {
      t *const buf = (t*)_TIFFmalloc(TIFFTileSize(tif));
      if (buf) {
        for (unsigned int row = 0; row<ny; row+=th)
          for (unsigned int col = 0; col<nx; col+=tw) {
            if (TIFFReadTile(tif,buf,col,row,0,0)<0) {
              _TIFFfree(buf); TIFFClose(tif);
              throw CImgException(_cimg_instance
                                  "load_tiff() : Invalid tile in file '%s'.",
                                  cimg_instance,
                                  TIFFFileName(tif));
            }
            const t *ptr = buf;
            for (unsigned int rr = row; rr<cimg::min((unsigned int)(row+th),(unsigned int)ny); ++rr)
              for (unsigned int cc = col; cc<cimg::min((unsigned int)(col+tw),(unsigned int)nx); ++cc)
                for (unsigned int vv = 0; vv<samplesperpixel; ++vv)
                  (*this)(cc,rr,vv) = (T)(ptr[(rr-row)*th*samplesperpixel + (cc-col)*samplesperpixel + vv]);
          }
        _TIFFfree(buf);
      }
    }

    template<typename t>
    void _load_tiff_tiled_separate(TIFF *const tif, const uint16 samplesperpixel, const uint32 nx, const uint32 ny, const uint32 tw, const uint32 th) {
      t *const buf = (t*)_TIFFmalloc(TIFFTileSize(tif));
      if (buf) {
        for (unsigned int vv = 0; vv<samplesperpixel; ++vv)
          for (unsigned int row = 0; row<ny; row+=th)
            for (unsigned int col = 0; col<nx; col+=tw) {
              if (TIFFReadTile(tif,buf,col,row,0,vv)<0) {
                _TIFFfree(buf); TIFFClose(tif);
                throw CImgException(_cimg_instance
                                    "load_tiff() : Invalid tile in file '%s'.",
                                    cimg_instance,
                                    TIFFFileName(tif));
              }
              const t *ptr = buf;
              for (unsigned int rr = row; rr<cimg::min((unsigned int)(row+th),(unsigned int)ny); ++rr)
                for (unsigned int cc = col; cc<cimg::min((unsigned int)(col+tw),(unsigned int)nx); ++cc)
                  (*this)(cc,rr,vv) = (T)*(ptr++);
            }
        _TIFFfree(buf);
      }
    }

    template<typename t>
    void _load_tiff_contig(TIFF *const tif, const uint16 samplesperpixel, const uint32 nx, const uint32 ny) {
      t *const buf = (t*)_TIFFmalloc(TIFFStripSize(tif));
      if (buf) {
        uint32 row, rowsperstrip = (uint32)-1;
        TIFFGetField(tif,TIFFTAG_ROWSPERSTRIP,&rowsperstrip);
        for (row = 0; row<ny; row+= rowsperstrip) {
          uint32 nrow = (row+rowsperstrip>ny?ny-row:rowsperstrip);
          tstrip_t strip = TIFFComputeStrip(tif, row, 0);
          if ((TIFFReadEncodedStrip(tif,strip,buf,-1))<0) {
            _TIFFfree(buf); TIFFClose(tif);
            throw CImgException(_cimg_instance
                                "load_tiff() : Invalid strip in file '%s'.",
                                cimg_instance,
                                TIFFFileName(tif));
          }
          const t *ptr = buf;
          for (unsigned int rr = 0; rr<nrow; ++rr)
            for (unsigned int cc = 0; cc<nx; ++cc)
              for (unsigned int vv = 0; vv<samplesperpixel; ++vv) (*this)(cc,row+rr,vv) = (T)*(ptr++);
        }
        _TIFFfree(buf);
      }
    }

    template<typename t>
    void _load_tiff_separate(TIFF *const tif, const uint16 samplesperpixel, const uint32 nx, const uint32 ny) {
      t *buf = (t*)_TIFFmalloc(TIFFStripSize(tif));
      if (buf) {
        uint32 row, rowsperstrip = (uint32)-1;
        TIFFGetField(tif,TIFFTAG_ROWSPERSTRIP,&rowsperstrip);
        for (unsigned int vv = 0; vv<samplesperpixel; ++vv)
          for (row = 0; row<ny; row+= rowsperstrip) {
            uint32 nrow = (row+rowsperstrip>ny?ny-row:rowsperstrip);
            tstrip_t strip = TIFFComputeStrip(tif, row, vv);
            if ((TIFFReadEncodedStrip(tif,strip,buf,-1))<0) {
              _TIFFfree(buf); TIFFClose(tif);
              throw CImgException(_cimg_instance
                                  "load_tiff() : Invalid strip in file '%s'.",
                                  cimg_instance,
                                  TIFFFileName(tif));
            }
            const t *ptr = buf;
            for (unsigned int rr = 0;rr<nrow; ++rr)
              for (unsigned int cc = 0; cc<nx; ++cc)
                (*this)(cc,row+rr,vv) = (T)*(ptr++);
          }
        _TIFFfree(buf);
      }
    }

    CImg<T>& _load_tiff(TIFF *const tif, const unsigned int directory) {
      if (!TIFFSetDirectory(tif,directory)) return assign();
      uint16 samplesperpixel, bitspersample;
      uint16 sampleformat = SAMPLEFORMAT_UINT;
      uint32 nx,ny;
      const char *const filename = TIFFFileName(tif);
      TIFFGetField(tif,TIFFTAG_IMAGEWIDTH,&nx);
      TIFFGetField(tif,TIFFTAG_IMAGELENGTH,&ny);
      TIFFGetField(tif,TIFFTAG_SAMPLESPERPIXEL,&samplesperpixel);
      TIFFGetField(tif, TIFFTAG_SAMPLEFORMAT, &sampleformat);
      TIFFGetFieldDefaulted(tif,TIFFTAG_BITSPERSAMPLE,&bitspersample);
      assign(nx,ny,1,samplesperpixel);
      if (bitspersample!=8 || !(samplesperpixel==3 || samplesperpixel==4)) {
        uint16 photo, config;
        TIFFGetField(tif,TIFFTAG_PLANARCONFIG,&config);
        TIFFGetField(tif,TIFFTAG_PHOTOMETRIC,&photo);
        if (TIFFIsTiled(tif)) {
          uint32 tw, th;
          TIFFGetField(tif,TIFFTAG_TILEWIDTH,&tw);
          TIFFGetField(tif,TIFFTAG_TILELENGTH,&th);
          if (config==PLANARCONFIG_CONTIG) switch (bitspersample) {
            case 8 : {
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_tiled_contig<unsigned char>(tif,samplesperpixel,nx,ny,tw,th);
              else _load_tiff_tiled_contig<signed char>(tif,samplesperpixel,nx,ny,tw,th);
            } break;
            case 16 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_tiled_contig<unsigned short>(tif,samplesperpixel,nx,ny,tw,th);
              else _load_tiff_tiled_contig<short>(tif,samplesperpixel,nx,ny,tw,th);
              break;
            case 32 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_tiled_contig<unsigned int>(tif,samplesperpixel,nx,ny,tw,th);
              else if (sampleformat==SAMPLEFORMAT_INT) _load_tiff_tiled_contig<int>(tif,samplesperpixel,nx,ny,tw,th);
              else _load_tiff_tiled_contig<float>(tif,samplesperpixel,nx,ny,tw,th);
              break;
            } else switch (bitspersample) {
            case 8 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_tiled_separate<unsigned char>(tif,samplesperpixel,nx,ny,tw,th);
              else _load_tiff_tiled_separate<signed char>(tif,samplesperpixel,nx,ny,tw,th);
              break;
            case 16 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_tiled_separate<unsigned short>(tif,samplesperpixel,nx,ny,tw,th);
              else _load_tiff_tiled_separate<short>(tif,samplesperpixel,nx,ny,tw,th);
              break;
            case 32 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_tiled_separate<unsigned int>(tif,samplesperpixel,nx,ny,tw,th);
              else if (sampleformat==SAMPLEFORMAT_INT) _load_tiff_tiled_separate<int>(tif,samplesperpixel,nx,ny,tw,th);
              else _load_tiff_tiled_separate<float>(tif,samplesperpixel,nx,ny,tw,th);
              break;
            }
        } else {
          if (config==PLANARCONFIG_CONTIG) switch (bitspersample) {
            case 8 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_contig<unsigned char>(tif,samplesperpixel,nx,ny);
              else _load_tiff_contig<signed char>(tif,samplesperpixel,nx,ny);
              break;
            case 16 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_contig<unsigned short>(tif,samplesperpixel,nx,ny);
              else _load_tiff_contig<short>(tif,samplesperpixel,nx,ny);
              break;
            case 32 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_contig<unsigned int>(tif,samplesperpixel,nx,ny);
              else if (sampleformat==SAMPLEFORMAT_INT) _load_tiff_contig<int>(tif,samplesperpixel,nx,ny);
              else _load_tiff_contig<float>(tif,samplesperpixel,nx,ny);
              break;
            } else switch (bitspersample){
            case 8 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_separate<unsigned char>(tif,samplesperpixel,nx,ny);
              else _load_tiff_separate<signed char>(tif,samplesperpixel,nx,ny);
              break;
            case 16 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_separate<unsigned short>(tif,samplesperpixel,nx,ny);
              else _load_tiff_separate<short>(tif,samplesperpixel,nx,ny);
              break;
            case 32 :
              if (sampleformat==SAMPLEFORMAT_UINT) _load_tiff_separate<unsigned int>(tif,samplesperpixel,nx,ny);
              else if (sampleformat==SAMPLEFORMAT_INT) _load_tiff_separate<int>(tif,samplesperpixel,nx,ny);
              else _load_tiff_separate<float>(tif,samplesperpixel,nx,ny);
              break;
            }
        }
      } else {
        uint32 *const raster = (uint32*)_TIFFmalloc(nx*ny*sizeof(uint32));
        if (!raster) {
          _TIFFfree(raster); TIFFClose(tif);
          throw CImgException(_cimg_instance
                              "load_tiff() : Failed to allocate memory (%s) for file '%s'.",
                              cimg_instance,
                              cimg::strbuffersize(nx*ny*sizeof(uint32)),filename);
        }
        TIFFReadRGBAImage(tif,nx,ny,raster,0);
        switch (samplesperpixel) {
        case 1 : {
          cimg_forXY(*this,x,y) (*this)(x,y) = (T)(float)((raster[nx*(ny-1-y)+x] + 128)/257);
        } break;
        case 3 : {
          cimg_forXY(*this,x,y) {
            (*this)(x,y,0) = (T)(float)TIFFGetR(raster[nx*(ny-1-y)+x]);
            (*this)(x,y,1) = (T)(float)TIFFGetG(raster[nx*(ny-1-y)+x]);
            (*this)(x,y,2) = (T)(float)TIFFGetB(raster[nx*(ny-1-y)+x]);
          }
        } break;
        case 4 : {
          cimg_forXY(*this,x,y) {
            (*this)(x,y,0) = (T)(float)TIFFGetR(raster[nx*(ny-1-y)+x]);
            (*this)(x,y,1) = (T)(float)TIFFGetG(raster[nx*(ny-1-y)+x]);
            (*this)(x,y,2) = (T)(float)TIFFGetB(raster[nx*(ny-1-y)+x]);
            (*this)(x,y,3) = (T)(float)TIFFGetA(raster[nx*(ny-1-y)+x]);
          }
        } break;
        }
        _TIFFfree(raster);
      }
      return *this;
    }
#endif

    //! Load an image from a MINC2 file.
    // (Original code by Haz-Edine Assemlal).
    CImg<T>& load_minc2(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_minc2() : Specified filename is (null).",
                                    cimg_instance);
#ifndef cimg_use_minc2
      return load_other(filename);
#else

      // Open the MINC2 volume in read-only access.
      mihandle_t hvol;
      int result = miopen_volume(filename,MI2_OPEN_RDWR,&hvol);
      if (result!=MI_NOERROR)
        throw CImgIOException(_cimg_instance
                              "load_minc2() : Invalid MINC2 format for file '%s'.",
                              cimg_instance,filename);

      mitype_t volume_data_type;
      result = miget_data_type(hvol,&volume_data_type);

      int slice_scaling_flag;
      result = miget_slice_scaling_flag(hvol,&slice_scaling_flag);

      double valid_max, valid_min;
      result = miget_volume_valid_range(hvol,&valid_max,&valid_min);

      miclass_t volume_data_class;
      result = miget_data_class(hvol,&volume_data_class);

      midimhandle_t *const hdims = (midimhandle_t*)std::malloc(4*sizeof(midimhandle_t));
      result = miget_volume_dimensions(hvol,MI_DIMCLASS_ANY,MI_DIMATTR_ALL,MI_DIMORDER_FILE,4,hdims);

      CImg<uintT> minc_dims(4,1,1,1,0);
      cimg_forX(minc_dims,d) {
        miboolean_t irregular;
        result = miget_dimension_sampling_flag(hdims[d],&irregular);
        if (irregular) {
          char* name;
          result = miget_dimension_name(hdims[d],&name);
          const CImg<charT> _name = CImg<charT>::string(name);
          mifree_name(name);
          throw CImgIOException(_cimg_instance
                                "load_minc2() : Unsupported dimension (%s) detected in file '%s'.",
                                cimg_instance,name,filename);
        }
      }

      result = miget_dimension_sizes(hdims,4,minc_dims.data());
      miflipping_t file_order;
      miflipping_t sign;
      result = miget_dimension_apparent_voxel_order(*hdims,&file_order,&sign);
      if (file_order)
        cimg::warn(_cimg_instance
                   "load_minc2() : Unsupported voxel order (%d) detected in file '%s'.",
                   cimg_instance,file_order,filename);

      CImg<intT> permutations, permutations_inv;
      const CImg<uintT>
        minc_dims_sort = minc_dims.get_sort(permutations,true),
        minc_dims_sort_inv = minc_dims.get_sort(permutations_inv,false);

      int nb_useful_dims = 0;
      if (minc_dims(0)!=0) ++nb_useful_dims;
      if (minc_dims(1)!=0) ++nb_useful_dims;
      if (minc_dims(2)!=0) ++nb_useful_dims;
      if (minc_dims(3)!=0) ++nb_useful_dims;

      // BUG in MINC2 ? count as to be equal to 4, not to nb_useful_dims.
      CImg<ulongT> count(4,1,1,1,1);
      unsigned int c = 0;
      cimg_foroff(minc_dims,d) if (minc_dims(d)) count(c++) = minc_dims(d);
      assign(!minc_dims(0)?1:minc_dims(0),
             !minc_dims(1)?1:minc_dims(1),
             !minc_dims(2)?1:minc_dims(2),
             !minc_dims(3)?1:minc_dims(3));
      if (nb_useful_dims==2) permute_axes("yxzc");
      else if (nb_useful_dims==3) permute_axes("zyxc");
      else if (nb_useful_dims==4) permute_axes("czyx");

      // Read the entire file in one operation.
      CImg<ulongT> start(4,1,1,1,0);
      if (slice_scaling_flag) result = miget_real_value_hyperslab(hvol,MI_TYPE_FLOAT,start.data(),count.data(),data());
      else result = miget_voxel_value_hyperslab(hvol,MI_TYPE_FLOAT,start.data(),count.data(),data());

      // Close the MINC2 volume.
      result = mifree_dimension_handle(*hdims);
      miclose_volume(hvol);
      return mirror('y');
#endif
    }

    //! Load an image from an ANALYZE7.5/NIFTI file.
    CImg<T>& load_analyze(const char *const filename, float *const voxsize=0) {
      return _load_analyze(0,filename,voxsize);
    }

    static CImg<T> get_load_analyze(const char *const filename, float *const voxsize=0) {
      return CImg<T>().load_analyze(filename,voxsize);
    }

    //! Load an image from an ANALYZE7.5/NIFTI file.
    CImg<T>& load_analyze(std::FILE *const file, float *const voxsize=0) {
      return _load_analyze(file,0,voxsize);
    }

    static CImg<T> get_load_analyze(std::FILE *const file, float *const voxsize=0) {
      return CImg<T>().load_analyze(file,voxsize);
    }

    CImg<T>& _load_analyze(std::FILE *const file, const char *const filename, float *const voxsize=0) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_analyze() : Specified filename is (null).",
                                    cimg_instance);

      std::FILE *nfile_header = 0, *nfile = 0;
      if (!file) {
        char body[1024] = { 0 };
        const char *const ext = cimg::split_filename(filename,body);
        if (!cimg::strcasecmp(ext,"hdr")) { // File is an Analyze header file.
          nfile_header = cimg::fopen(filename,"rb");
          std::sprintf(body + std::strlen(body),".img");
          nfile = cimg::fopen(body,"rb");
        } else if (!cimg::strcasecmp(ext,"img")) { // File is an Analyze data file.
          nfile = cimg::fopen(filename,"rb");
          std::sprintf(body + std::strlen(body),".hdr");
          nfile_header = cimg::fopen(body,"rb");
        } else nfile_header = nfile = cimg::fopen(filename,"rb"); // File is a Niftii file.
      } else nfile_header = nfile = file; // File is a Niftii file.
      if (!nfile || !nfile_header)
        throw CImgIOException(_cimg_instance
                              "load_analyze() : Invalid Analyze7.5 or NIFTI header in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");

      // Read header.
      bool endian = false;
      unsigned int header_size;
      cimg::fread(&header_size,1,nfile_header);
      if (!header_size)
        throw CImgIOException(_cimg_instance
                              "load_analyze() : Invalid zero-sized header in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");

      if (header_size>=4096) { endian = true; cimg::invert_endianness(header_size); }
      unsigned char *const header = new unsigned char[header_size];
      cimg::fread(header+4,header_size-4,nfile_header);
      if (!file && nfile_header!=nfile) cimg::fclose(nfile_header);
      if (endian) {
        cimg::invert_endianness((short*)(header+40),5);
        cimg::invert_endianness((short*)(header+70),1);
        cimg::invert_endianness((short*)(header+72),1);
        cimg::invert_endianness((float*)(header+76),4);
        cimg::invert_endianness((float*)(header+112),1);
      }
      unsigned short *dim = (unsigned short*)(header+40), dimx = 1, dimy = 1, dimz = 1, dimv = 1;
      if (!dim[0])
        cimg::warn(_cimg_instance
                   "load_analyze() : File '%s' defines an image with zero dimensions.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      if (dim[0]>4)
        cimg::warn(_cimg_instance
                   "load_analyze() : File '%s' defines an image with %u dimensions, reading only the 4 first.",
                   cimg_instance,
                   filename?filename:"(FILE*)",dim[0]);

      if (dim[0]>=1) dimx = dim[1];
      if (dim[0]>=2) dimy = dim[2];
      if (dim[0]>=3) dimz = dim[3];
      if (dim[0]>=4) dimv = dim[4];
      float scalefactor = *(float*)(header+112); if (scalefactor==0) scalefactor=1;
      const unsigned short datatype = *(short*)(header+70);
      if (voxsize) {
        const float *vsize = (float*)(header+76);
        voxsize[0] = vsize[1]; voxsize[1] = vsize[2]; voxsize[2] = vsize[3];
      }
      delete[] header;

      // Read pixel data.
      assign(dimx,dimy,dimz,dimv);
      switch (datatype) {
      case 2 : {
        unsigned char *const buffer = new unsigned char[dimx*dimy*dimz*dimv];
        cimg::fread(buffer,dimx*dimy*dimz*dimv,nfile);
        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
        delete[] buffer;
      } break;
      case 4 : {
        short *const buffer = new short[dimx*dimy*dimz*dimv];
        cimg::fread(buffer,dimx*dimy*dimz*dimv,nfile);
        if (endian) cimg::invert_endianness(buffer,dimx*dimy*dimz*dimv);
        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
        delete[] buffer;
      } break;
      case 8 : {
        int *const buffer = new int[dimx*dimy*dimz*dimv];
        cimg::fread(buffer,dimx*dimy*dimz*dimv,nfile);
        if (endian) cimg::invert_endianness(buffer,dimx*dimy*dimz*dimv);
        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
        delete[] buffer;
      } break;
      case 16 : {
        float *const buffer = new float[dimx*dimy*dimz*dimv];
        cimg::fread(buffer,dimx*dimy*dimz*dimv,nfile);
        if (endian) cimg::invert_endianness(buffer,dimx*dimy*dimz*dimv);
        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
        delete[] buffer;
      } break;
      case 64 : {
        double *const buffer = new double[dimx*dimy*dimz*dimv];
        cimg::fread(buffer,dimx*dimy*dimz*dimv,nfile);
        if (endian) cimg::invert_endianness(buffer,dimx*dimy*dimz*dimv);
        cimg_foroff(*this,off) _data[off] = (T)(buffer[off]*scalefactor);
        delete[] buffer;
      } break;
      default :
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_analyze() : Unable to load datatype %d in file '%s'",
                              cimg_instance,
                              datatype,filename?filename:"(FILE*)");
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image (list) from a .cimg file.
    CImg<T>& load_cimg(const char *const filename, const char axis='z', const float align=0) {
      CImgList<T> list;
      list.load_cimg(filename);
      if (list._width==1) return list[0].move_to(*this);
      return assign(list.get_append(axis,align));
    }

    static CImg<T> get_load_cimg(const char *const filename, const char axis='z', const float align=0) {
      return CImg<T>().load_cimg(filename,axis,align);
    }

    //! Load an image (list) from a .cimg file.
    CImg<T>& load_cimg(std::FILE *const file, const char axis='z', const float align=0) {
      CImgList<T> list;
      list.load_cimg(file);
      if (list._width==1) return list[0].move_to(*this);
      return assign(list.get_append(axis,align));
    }

    static CImg<T> get_load_cimg(std::FILE *const file, const char axis='z', const float align=0) {
      return CImg<T>().load_cimg(file,axis,align);
    }

    //! Load a sub-image (list) from a .cimg file.
    CImg<T>& load_cimg(const char *const filename,
                       const unsigned int n0, const unsigned int n1,
                       const unsigned int x0, const unsigned int y0, const unsigned int z0, const unsigned int c0,
                       const unsigned int x1, const unsigned int y1, const unsigned int z1, const unsigned int c1,
                       const char axis='z', const float align=0) {
      CImgList<T> list;
      list.load_cimg(filename,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
      if (list._width==1) return list[0].move_to(*this);
      return assign(list.get_append(axis,align));
    }

    static CImg<T> get_load_cimg(const char *const filename,
                                 const unsigned int n0, const unsigned int n1,
                                 const unsigned int x0, const unsigned int y0, const unsigned int z0, const unsigned int c0,
                                 const unsigned int x1, const unsigned int y1, const unsigned int z1, const unsigned int c1,
                                 const char axis='z', const float align=0) {
      return CImg<T>().load_cimg(filename,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1,axis,align);
    }

    //! Load a sub-image (list) from a non-compressed .cimg file.
    CImg<T>& load_cimg(std::FILE *const file,
                       const unsigned int n0, const unsigned int n1,
                       const unsigned int x0, const unsigned int y0, const unsigned int z0, const unsigned int c0,
                       const unsigned int x1, const unsigned int y1, const unsigned int z1, const unsigned int c1,
                       const char axis='z', const float align=0) {
      CImgList<T> list;
      list.load_cimg(file,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
      if (list._width==1) return list[0].move_to(*this);
      return assign(list.get_append(axis,align));
    }

    static CImg<T> get_load_cimg(std::FILE *const file,
                                 const unsigned int n0, const unsigned int n1,
                                 const unsigned int x0, const unsigned int y0, const unsigned int z0, const unsigned int c0,
                                 const unsigned int x1, const unsigned int y1, const unsigned int z1, const unsigned int c1,
                                 const char axis='z', const float align=0) {
      return CImg<T>().load_cimg(file,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1,axis,align);
    }

    //! Load an image from an INRIMAGE-4 file.
    CImg<T>& load_inr(const char *const filename, float *const voxsize=0) {
      return _load_inr(0,filename,voxsize);
    }

    static CImg<T> get_load_inr(const char *const filename, float *const voxsize=0) {
      return CImg<T>().load_inr(filename,voxsize);
    }

    //! Load an image from an INRIMAGE-4 file.
    CImg<T>& load_inr(std::FILE *const file, float *const voxsize=0) {
      return _load_inr(file,0,voxsize);
    }

    static CImg<T> get_load_inr(std::FILE *const file, float *voxsize=0) {
      return CImg<T>().load_inr(file,voxsize);
    }

    // Load an image from an INRIMAGE-4 file (internal).
    static void _load_inr_header(std::FILE *file, int out[8], float *const voxsize) {
      char item[1024] = { 0 }, tmp1[64] = { 0 }, tmp2[64] = { 0 };
      out[0] = std::fscanf(file,"%63s",item);
      out[0] = out[1] = out[2] = out[3] = out[5] = 1; out[4] = out[6] = out[7] = -1;
      if(cimg::strncasecmp(item,"#INRIMAGE-4#{",13)!=0)
        throw CImgIOException("CImg<%s>::load_inr() : INRIMAGE-4 header not found.",
                              pixel_type());

      while (std::fscanf(file," %63[^\n]%*c",item)!=EOF && std::strncmp(item,"##}",3)) {
        std::sscanf(item," XDIM%*[^0-9]%d",out);
        std::sscanf(item," YDIM%*[^0-9]%d",out+1);
        std::sscanf(item," ZDIM%*[^0-9]%d",out+2);
        std::sscanf(item," VDIM%*[^0-9]%d",out+3);
        std::sscanf(item," PIXSIZE%*[^0-9]%d",out+6);
        if (voxsize) {
          std::sscanf(item," VX%*[^0-9.+-]%f",voxsize);
          std::sscanf(item," VY%*[^0-9.+-]%f",voxsize+1);
          std::sscanf(item," VZ%*[^0-9.+-]%f",voxsize+2);
        }
        if (std::sscanf(item," CPU%*[ =]%s",tmp1)) out[7]=cimg::strncasecmp(tmp1,"sun",3)?0:1;
        switch (std::sscanf(item," TYPE%*[ =]%s %s",tmp1,tmp2)) {
        case 0 : break;
        case 2 : out[5] = cimg::strncasecmp(tmp1,"unsigned",8)?1:0; std::strncpy(tmp1,tmp2,sizeof(tmp1)-1);
        case 1 :
          if (!cimg::strncasecmp(tmp1,"int",3)   || !cimg::strncasecmp(tmp1,"fixed",5))  out[4] = 0;
          if (!cimg::strncasecmp(tmp1,"float",5) || !cimg::strncasecmp(tmp1,"double",6)) out[4] = 1;
          if (!cimg::strncasecmp(tmp1,"packed",6))                                       out[4] = 2;
          if (out[4]>=0) break;
        default :
          throw CImgIOException("CImg<%s>::load_inr() : Invalid pixel type '%s' defined in header.",
                                pixel_type(),
                                tmp2);
        }
      }
      if(out[0]<0 || out[1]<0 || out[2]<0 || out[3]<0)
        throw CImgIOException("CImg<%s>::load_inr() : Invalid dimensions (%d,%d,%d,%d) defined in header.",
                              pixel_type(),
                              out[0],out[1],out[2],out[3]);
      if(out[4]<0 || out[5]<0)
        throw CImgIOException("CImg<%s>::load_inr() : Incomplete pixel type defined in header.",
                              pixel_type());
      if(out[6]<0)
        throw CImgIOException("CImg<%s>::load_inr() : Incomplete PIXSIZE field defined in header.",
                              pixel_type());
      if(out[7]<0)
        throw CImgIOException("CImg<%s>::load_inr() : Big/Little Endian coding type undefined in header.",
                              pixel_type());
    }

    CImg<T>& _load_inr(std::FILE *const file, const char *const filename, float *const voxsize) {
#define _cimg_load_inr_case(Tf,sign,pixsize,Ts) \
     if (!loaded && fopt[6]==pixsize && fopt[4]==Tf && fopt[5]==sign) { \
        Ts *xval, *const val = new Ts[fopt[0]*fopt[3]]; \
        cimg_forYZ(*this,y,z) { \
            cimg::fread(val,fopt[0]*fopt[3],nfile); \
            if (fopt[7]!=endian) cimg::invert_endianness(val,fopt[0]*fopt[3]); \
            xval = val; cimg_forX(*this,x) cimg_forC(*this,c) (*this)(x,y,z,c) = (T)*(xval++); \
          } \
        delete[] val; \
        loaded = true; \
      }

      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_inr() : Specified filename is (null).",
                                    cimg_instance);

      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      int fopt[8], endian=cimg::endianness()?1:0;
      bool loaded = false;
      if (voxsize) voxsize[0]=voxsize[1]=voxsize[2]=1;
      _load_inr_header(nfile,fopt,voxsize);
      assign(fopt[0],fopt[1],fopt[2],fopt[3]);
      _cimg_load_inr_case(0,0,8,unsigned char);
      _cimg_load_inr_case(0,1,8,char);
      _cimg_load_inr_case(0,0,16,unsigned short);
      _cimg_load_inr_case(0,1,16,short);
      _cimg_load_inr_case(0,0,32,unsigned int);
      _cimg_load_inr_case(0,1,32,int);
      _cimg_load_inr_case(1,0,32,float);
      _cimg_load_inr_case(1,1,32,float);
      _cimg_load_inr_case(1,0,64,double);
      _cimg_load_inr_case(1,1,64,double);
      if (!loaded) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_inr() : Unknown pixel type defined in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a EXR file.
    CImg<T>& load_exr(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_exr() : Specified filename is (null).",
                                    cimg_instance);

#ifndef cimg_use_openexr
      return load_other(filename);
#else
      Imf::RgbaInputFile file(filename);
      Imath::Box2i dw = file.dataWindow();
      const int
        inwidth = dw.max.x - dw.min.x + 1,
        inheight = dw.max.y - dw.min.y + 1;
      Imf::Array2D<Imf::Rgba> pixels;
      pixels.resizeErase(inheight,inwidth);
      file.setFrameBuffer(&pixels[0][0] - dw.min.x - dw.min.y*inwidth, 1, inwidth);
      file.readPixels(dw.min.y, dw.max.y);
      assign(inwidth,inheight,1,4);
      T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2), *ptr_a = data(0,0,0,3);
      cimg_forXY(*this,x,y) {
        *(ptr_r++) = (T)pixels[y][x].r;
        *(ptr_g++) = (T)pixels[y][x].g;
        *(ptr_b++) = (T)pixels[y][x].b;
        *(ptr_a++) = (T)pixels[y][x].a;
      }
      return *this;
#endif
    }

    static CImg<T> get_load_exr(const char *const filename) {
      return CImg<T>().load_exr(filename);
    }

    //! Load an image from a PANDORE file.
    CImg<T>& load_pandore(const char *const filename) {
      return _load_pandore(0,filename);
    }

    static CImg<T> get_load_pandore(const char *const filename) {
      return CImg<T>().load_pandore(filename);
    }

    //! Load an image from a PANDORE file.
    CImg<T>& load_pandore(std::FILE *const file) {
      return _load_pandore(file,0);
    }

    static CImg<T> get_load_pandore(std::FILE *const file) {
      return CImg<T>().load_pandore(file);
    }

    CImg<T>& _load_pandore(std::FILE *const file, const char *const filename) {
#define __cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,ndim,stype) \
        cimg::fread(dims,nbdim,nfile); \
        if (endian) cimg::invert_endianness(dims,nbdim); \
        assign(nwidth,nheight,ndepth,ndim); \
        const unsigned int siz = size(); \
        stype *buffer = new stype[siz]; \
        cimg::fread(buffer,siz,nfile); \
        if (endian) cimg::invert_endianness(buffer,siz); \
        T *ptrd = _data; \
        cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++); \
        buffer-=siz; \
        delete[] buffer

#define _cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,dim,stype1,stype2,stype3,ltype) { \
        if (sizeof(stype1)==ltype) { __cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,dim,stype1); } \
        else if (sizeof(stype2)==ltype) { __cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,dim,stype2); } \
        else if (sizeof(stype3)==ltype) { __cimg_load_pandore_case(nbdim,nwidth,nheight,ndepth,dim,stype3); } \
        else throw CImgIOException(_cimg_instance \
                                   "load_pandore() : Unknown pixel datatype in file '%s'.", \
                                   cimg_instance, \
                                   filename?filename:"(FILE*)"); }

      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_pandore() : Specified filename is (null).",
                                    cimg_instance);

      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      char header[32] = { 0 };
      cimg::fread(header,12,nfile);
      if (cimg::strncasecmp("PANDORE",header,7)) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_pandore() : PANDORE header not found in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }
      unsigned int imageid, dims[8] = { 0 };
      cimg::fread(&imageid,1,nfile);
      const bool endian = (imageid>255);
      if (endian) cimg::invert_endianness(imageid);
      cimg::fread(header,20,nfile);

      switch (imageid) {
      case 2: _cimg_load_pandore_case(2,dims[1],1,1,1,unsigned char,unsigned char,unsigned char,1); break;
      case 3: _cimg_load_pandore_case(2,dims[1],1,1,1,long,int,short,4); break;
      case 4: _cimg_load_pandore_case(2,dims[1],1,1,1,double,float,float,4); break;
      case 5: _cimg_load_pandore_case(3,dims[2],dims[1],1,1,unsigned char,unsigned char,unsigned char,1); break;
      case 6: _cimg_load_pandore_case(3,dims[2],dims[1],1,1,long,int,short,4); break;
      case 7: _cimg_load_pandore_case(3,dims[2],dims[1],1,1,double,float,float,4); break;
      case 8: _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],1,unsigned char,unsigned char,unsigned char,1); break;
      case 9: _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],1,long,int,short,4); break;
      case 10: _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],1,double,float,float,4); break;
      case 11 : { // Region 1d
        cimg::fread(dims,3,nfile);
        if (endian) cimg::invert_endianness(dims,3);
        assign(dims[1],1,1,1);
        const unsigned siz = size();
        if (dims[2]<256) {
          unsigned char *buffer = new unsigned char[siz];
          cimg::fread(buffer,siz,nfile);
          T *ptrd = _data;
          cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
          buffer-=siz;
          delete[] buffer;
        } else {
          if (dims[2]<65536) {
            unsigned short *buffer = new unsigned short[siz];
            cimg::fread(buffer,siz,nfile);
            if (endian) cimg::invert_endianness(buffer,siz);
            T *ptrd = _data;
            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
            buffer-=siz;
            delete[] buffer;
          } else {
            unsigned int *buffer = new unsigned int[siz];
            cimg::fread(buffer,siz,nfile);
            if (endian) cimg::invert_endianness(buffer,siz);
            T *ptrd = _data;
            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
            buffer-=siz;
            delete[] buffer;
          }
        }
      }
        break;
      case 12 : { // Region 2d
        cimg::fread(dims,4,nfile);
        if (endian) cimg::invert_endianness(dims,4);
        assign(dims[2],dims[1],1,1);
        const unsigned int siz = size();
        if (dims[3]<256) {
          unsigned char *buffer = new unsigned char[siz];
          cimg::fread(buffer,siz,nfile);
          T *ptrd = _data;
          cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
          buffer-=siz;
          delete[] buffer;
        } else {
          if (dims[3]<65536) {
            unsigned short *buffer = new unsigned short[siz];
            cimg::fread(buffer,siz,nfile);
            if (endian) cimg::invert_endianness(buffer,siz);
            T *ptrd = _data;
            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
            buffer-=siz;
            delete[] buffer;
          } else {
            unsigned long *buffer = new unsigned long[siz];
            cimg::fread(buffer,siz,nfile);
            if (endian) cimg::invert_endianness(buffer,siz);
            T *ptrd = _data;
            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
            buffer-=siz;
            delete[] buffer;
          }
        }
      }
        break;
      case 13 : { // Region 3d
        cimg::fread(dims,5,nfile);
        if (endian) cimg::invert_endianness(dims,5);
        assign(dims[3],dims[2],dims[1],1);
        const unsigned int siz = size();
        if (dims[4]<256) {
          unsigned char *buffer = new unsigned char[siz];
          cimg::fread(buffer,siz,nfile);
          T *ptrd = _data;
          cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
          buffer-=siz;
          delete[] buffer;
        } else {
          if (dims[4]<65536) {
            unsigned short *buffer = new unsigned short[siz];
            cimg::fread(buffer,siz,nfile);
            if (endian) cimg::invert_endianness(buffer,siz);
            T *ptrd = _data;
            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
            buffer-=siz;
            delete[] buffer;
          } else {
            unsigned int *buffer = new unsigned int[siz];
            cimg::fread(buffer,siz,nfile);
            if (endian) cimg::invert_endianness(buffer,siz);
            T *ptrd = _data;
            cimg_foroff(*this,off) *(ptrd++) = (T)*(buffer++);
            buffer-=siz;
            delete[] buffer;
          }
        }
      }
        break;
      case 16: _cimg_load_pandore_case(4,dims[2],dims[1],1,3,unsigned char,unsigned char,unsigned char,1); break;
      case 17: _cimg_load_pandore_case(4,dims[2],dims[1],1,3,long,int,short,4); break;
      case 18: _cimg_load_pandore_case(4,dims[2],dims[1],1,3,double,float,float,4); break;
      case 19: _cimg_load_pandore_case(5,dims[3],dims[2],dims[1],3,unsigned char,unsigned char,unsigned char,1); break;
      case 20: _cimg_load_pandore_case(5,dims[3],dims[2],dims[1],3,long,int,short,4); break;
      case 21: _cimg_load_pandore_case(5,dims[3],dims[2],dims[1],3,double,float,float,4); break;
      case 22: _cimg_load_pandore_case(2,dims[1],1,1,dims[0],unsigned char,unsigned char,unsigned char,1); break;
      case 23: _cimg_load_pandore_case(2,dims[1],1,1,dims[0],long,int,short,4);
      case 24: _cimg_load_pandore_case(2,dims[1],1,1,dims[0],unsigned long,unsigned int,unsigned short,4); break;
      case 25: _cimg_load_pandore_case(2,dims[1],1,1,dims[0],double,float,float,4); break;
      case 26: _cimg_load_pandore_case(3,dims[2],dims[1],1,dims[0],unsigned char,unsigned char,unsigned char,1); break;
      case 27: _cimg_load_pandore_case(3,dims[2],dims[1],1,dims[0],long,int,short,4); break;
      case 28: _cimg_load_pandore_case(3,dims[2],dims[1],1,dims[0],unsigned long,unsigned int,unsigned short,4); break;
      case 29: _cimg_load_pandore_case(3,dims[2],dims[1],1,dims[0],double,float,float,4); break;
      case 30: _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],dims[0],unsigned char,unsigned char,unsigned char,1); break;
      case 31: _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],dims[0],long,int,short,4); break;
      case 32: _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],dims[0],unsigned long,unsigned int,unsigned short,4); break;
      case 33: _cimg_load_pandore_case(4,dims[3],dims[2],dims[1],dims[0],double,float,float,4); break;
      case 34 : { // Points 1d
        int ptbuf[4] = { 0 };
        cimg::fread(ptbuf,1,nfile);
        if (endian) cimg::invert_endianness(ptbuf,1);
        assign(1); (*this)(0) = (T)ptbuf[0];
      } break;
      case 35 : { // Points 2d
        int ptbuf[4] = { 0 };
        cimg::fread(ptbuf,2,nfile);
        if (endian) cimg::invert_endianness(ptbuf,2);
        assign(2); (*this)(0) = (T)ptbuf[1]; (*this)(1) = (T)ptbuf[0];
      } break;
      case 36 : { // Points 3d
        int ptbuf[4] = { 0 };
        cimg::fread(ptbuf,3,nfile);
        if (endian) cimg::invert_endianness(ptbuf,3);
        assign(3); (*this)(0) = (T)ptbuf[2]; (*this)(1) = (T)ptbuf[1]; (*this)(2) = (T)ptbuf[0];
      } break;
      default :
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_pandore() : Unable to load data with ID_type %u in file '%s'.",
                              cimg_instance,
                              imageid,filename?filename:"(FILE*)");
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a PAR-REC (Philips) file.
    CImg<T>& load_parrec(const char *const filename, const char axis='c', const float align=0) {
      CImgList<T> list;
      list.load_parrec(filename);
      if (list._width==1) return list[0].move_to(*this);
      return assign(list.get_append(axis,align));
    }

    static CImg<T> get_load_parrec(const char *const filename, const char axis='c', const float align=0) {
      return CImg<T>().load_parrec(filename,axis,align);
    }

    //! Load an image from a .RAW file.
    CImg<T>& load_raw(const char *const filename,
                      const unsigned int sizex, const unsigned int sizey=1,
                      const unsigned int sizez=1, const unsigned int sizev=1,
                      const bool multiplexed=false, const bool invert_endianness=false) {
      return _load_raw(0,filename,sizex,sizey,sizez,sizev,multiplexed,invert_endianness);
    }

    static CImg<T> get_load_raw(const char *const filename,
                                const unsigned int sizex, const unsigned int sizey=1,
                                const unsigned int sizez=1, const unsigned int sizev=1,
                                const bool multiplexed=false, const bool invert_endianness=false) {
      return CImg<T>().load_raw(filename,sizex,sizey,sizez,sizev,multiplexed,invert_endianness);
    }

    //! Load an image from a .RAW file.
    CImg<T>& load_raw(std::FILE *const file,
                      const unsigned int sizex, const unsigned int sizey=1,
                      const unsigned int sizez=1, const unsigned int sizev=1,
                      const bool multiplexed=false, const bool invert_endianness=false) {
      return _load_raw(file,0,sizex,sizey,sizez,sizev,multiplexed,invert_endianness);
    }

    static CImg<T> get_load_raw(std::FILE *const file,
                                const unsigned int sizex, const unsigned int sizey=1,
                                const unsigned int sizez=1, const unsigned int sizev=1,
                                const bool multiplexed=false, const bool invert_endianness=false) {
      return CImg<T>().load_raw(file,sizex,sizey,sizez,sizev,multiplexed,invert_endianness);
    }

    CImg<T>& _load_raw(std::FILE *const file, const char *const filename,
                       const unsigned int sizex, const unsigned int sizey,
                       const unsigned int sizez, const unsigned int sizev,
                       const bool multiplexed, const bool invert_endianness) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_raw() : Specified filename is (null).",
                                    cimg_instance);

      assign(sizex,sizey,sizez,sizev,0);
      const unsigned int siz = size();
      if (siz) {
        std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
        if (!multiplexed) {
          cimg::fread(_data,siz,nfile);
          if (invert_endianness) cimg::invert_endianness(_data,siz);
        }
        else {
          CImg<T> buf(1,1,1,sizev);
          cimg_forXYZ(*this,x,y,z) {
            cimg::fread(buf._data,sizev,nfile);
            if (invert_endianness) cimg::invert_endianness(buf._data,sizev);
            set_vector_at(buf,x,y,z); }
        }
        if (!file) cimg::fclose(nfile);
      }
      return *this;
    }

    //! Load a video sequence using FFMPEG av's libraries.
    CImg<T>& load_ffmpeg(const char *const filename, const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                         const unsigned int step_frame=1, const bool pixel_format=true, const bool resume=false,
                         const char axis='z', const float align=0) {
      return get_load_ffmpeg(filename,first_frame,last_frame,step_frame,pixel_format,resume,axis,align).move_to(*this);
    }

    static CImg<T> get_load_ffmpeg(const char *const filename, const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                   const unsigned int step_frame=1, const bool pixel_format=true, const bool resume=false,
                                   const char axis='z', const float align=0) {
      return CImgList<T>().load_ffmpeg(filename,first_frame,last_frame,step_frame,pixel_format,resume).get_append(axis,align);
    }

    //! Load an image sequence from a YUV file.
    CImg<T>& load_yuv(const char *const filename,
                      const unsigned int sizex, const unsigned int sizey=1,
                      const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                      const unsigned int step_frame=1, const bool yuv2rgb=true, const char axis='z', const float align=0) {
      return get_load_yuv(filename,sizex,sizey,first_frame,last_frame,step_frame,yuv2rgb,axis,align).move_to(*this);
    }

    static CImg<T> get_load_yuv(const char *const filename,
                                const unsigned int sizex, const unsigned int sizey=1,
                                const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                const unsigned int step_frame=1, const bool yuv2rgb=true, const char axis='z', const float align=0) {
      return CImgList<T>().load_yuv(filename,sizex,sizey,first_frame,last_frame,step_frame,yuv2rgb).get_append(axis,align);
    }

    //! Load an image sequence from a YUV file.
    CImg<T>& load_yuv(std::FILE *const file,
                      const unsigned int sizex, const unsigned int sizey=1,
                      const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                      const unsigned int step_frame=1, const bool yuv2rgb=true, const char axis='z', const float align=0) {
      return get_load_yuv(file,sizex,sizey,first_frame,last_frame,step_frame,yuv2rgb,axis,align).move_to(*this);
    }

    static CImg<T> get_load_yuv(std::FILE *const file,
                                const unsigned int sizex, const unsigned int sizey=1,
                                const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                const unsigned int step_frame=1, const bool yuv2rgb=true, const char axis='z', const float align=0) {
      return CImgList<T>().load_yuv(file,sizex,sizey,first_frame,last_frame,step_frame,yuv2rgb).get_append(axis,align);
    }

    //! Load a 3d object from a .OFF file.
    template<typename tf, typename tc>
    CImg<T>& load_off(const char *const filename, CImgList<tf>& primitives, CImgList<tc>& colors) {
      return _load_off(0,filename,primitives,colors);
    }

    template<typename tf, typename tc>
    static CImg<T> get_load_off(const char *const filename, CImgList<tf>& primitives, CImgList<tc>& colors) {
      return CImg<T>().load_off(filename,primitives,colors);
    }

    //! Load a 3d object from a .OFF file.
    template<typename tf, typename tc>
    CImg<T>& load_off(std::FILE *const file, CImgList<tf>& primitives, CImgList<tc>& colors) {
      return _load_off(file,0,primitives,colors);
    }

    template<typename tf, typename tc>
    static CImg<T> get_load_off(std::FILE *const file, CImgList<tf>& primitives, CImgList<tc>& colors) {
      return CImg<T>().load_off(file,primitives,colors);
    }

    template<typename tf, typename tc>
    CImg<T>& _load_off(std::FILE *const file, const char *const filename,
                       CImgList<tf>& primitives, CImgList<tc>& colors) {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_off() : Specified filename is (null).",
                                    cimg_instance);

      std::FILE *const nfile = file?file:cimg::fopen(filename,"r");
      unsigned int nb_points = 0, nb_primitives = 0, nb_read = 0;
      char line[256] = { 0 };
      int err;

      // Skip comments, and read magic string OFF
      do { err = std::fscanf(nfile,"%255[^\n] ",line); } while (!err || (err==1 && *line=='#'));
      if (cimg::strncasecmp(line,"OFF",3) && cimg::strncasecmp(line,"COFF",4)) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_off() : OFF header not found in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }
      do { err = std::fscanf(nfile,"%255[^\n] ",line); } while (!err || (err==1 && *line=='#'));
      if ((err = std::sscanf(line,"%u%u%*[^\n] ",&nb_points,&nb_primitives))!=2) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "load_off() : Invalid number of vertices or primitives specified in file '%s'.",
                              cimg_instance,
                              filename?filename:"(FILE*)");
      }

      // Read points data
      assign(nb_points,3);
      float X = 0, Y = 0, Z = 0;
      cimg_forX(*this,l) {
        do { err = std::fscanf(nfile,"%255[^\n] ",line); } while (!err || (err==1 && *line=='#'));
        if ((err = std::sscanf(line,"%f%f%f%*[^\n] ",&X,&Y,&Z))!=3) {
          if (!file) cimg::fclose(nfile);
          throw CImgIOException(_cimg_instance
                                "load_off() : Failed to read vertex %u/%u in file '%s'.",
                                cimg_instance,
                                l+1,nb_points,filename?filename:"(FILE*)");
        }
        (*this)(l,0) = (T)X; (*this)(l,1) = (T)Y; (*this)(l,2) = (T)Z;
      }

      // Read primitive data
      primitives.assign();
      colors.assign();
      bool stopflag = false;
      while (!stopflag) {
        float c0 = 0.7f, c1 = 0.7f, c2 = 0.7f;
        unsigned int prim = 0, i0 = 0, i1 = 0, i2 = 0, i3 = 0, i4 = 0, i5 = 0, i6 = 0, i7 = 0;
        *line = 0;
        if ((err = std::fscanf(nfile,"%u",&prim))!=1) stopflag=true;
        else {
          ++nb_read;
          switch (prim) {
          case 1 : {
            if ((err = std::fscanf(nfile,"%u%255[^\n] ",&i0,line))<2) {
              cimg::warn(_cimg_instance
                         "load_off() : Failed to read primitive %u/%u from file '%s'.",
                         cimg_instance,
                         nb_read,nb_primitives,filename?filename:"(FILE*)");

              err = std::fscanf(nfile,"%*[^\n] ");
            } else {
              err = std::sscanf(line,"%f%f%f",&c0,&c1,&c2);
              CImg<tf>::vector(i0).move_to(primitives);
              CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)).move_to(colors);
            }
          } break;
          case 2 : {
            if ((err = std::fscanf(nfile,"%u%u%255[^\n] ",&i0,&i1,line))<2) {
              cimg::warn(_cimg_instance
                         "load_off() : Failed to read primitive %u/%u from file '%s'.",
                         cimg_instance,
                         nb_read,nb_primitives,filename?filename:"(FILE*)");

              err = std::fscanf(nfile,"%*[^\n] ");
            } else {
              err = std::sscanf(line,"%f%f%f",&c0,&c1,&c2);
              CImg<tf>::vector(i0,i1).move_to(primitives);
              CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)).move_to(colors);
            }
          } break;
          case 3 : {
            if ((err = std::fscanf(nfile,"%u%u%u%255[^\n] ",&i0,&i1,&i2,line))<3) {
              cimg::warn(_cimg_instance
                         "load_off() : Failed to read primitive %u/%u from file '%s'.",
                         cimg_instance,
                         nb_read,nb_primitives,filename?filename:"(FILE*)");

              err = std::fscanf(nfile,"%*[^\n] ");
            } else {
              err = std::sscanf(line,"%f%f%f",&c0,&c1,&c2);
              CImg<tf>::vector(i0,i2,i1).move_to(primitives);
              CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)).move_to(colors);
            }
          } break;
          case 4 : {
            if ((err = std::fscanf(nfile,"%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,line))<4) {
              cimg::warn(_cimg_instance
                         "load_off() : Failed to read primitive %u/%u from file '%s'.",
                         cimg_instance,
                         nb_read,nb_primitives,filename?filename:"(FILE*)");

              err = std::fscanf(nfile,"%*[^\n] ");
            } else {
              err = std::sscanf(line,"%f%f%f",&c0,&c1,&c2);
              CImg<tf>::vector(i0,i3,i2,i1).move_to(primitives);
              CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)).move_to(colors);
            }
          } break;
          case 5 : {
            if ((err = std::fscanf(nfile,"%u%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,&i4,line))<5) {
              cimg::warn(_cimg_instance
                         "load_off() : Failed to read primitive %u/%u from file '%s'.",
                         cimg_instance,
                         nb_read,nb_primitives,filename?filename:"(FILE*)");

              err = std::fscanf(nfile,"%*[^\n] ");
            } else {
              err = std::sscanf(line,"%f%f%f",&c0,&c1,&c2);
              CImg<tf>::vector(i0,i3,i2,i1).move_to(primitives);
              CImg<tf>::vector(i0,i4,i3).move_to(primitives);
              colors.insert(2,CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)));
              ++nb_primitives;
            }
          } break;
          case 6 : {
            if ((err = std::fscanf(nfile,"%u%u%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,&i4,&i5,line))<6) {
              cimg::warn(_cimg_instance
                         "load_off() : Failed to read primitive %u/%u from file '%s'.",
                         cimg_instance,
                         nb_read,nb_primitives,filename?filename:"(FILE*)");

              err = std::fscanf(nfile,"%*[^\n] ");
            } else {
              err = std::sscanf(line,"%f%f%f",&c0,&c1,&c2);
              CImg<tf>::vector(i0,i3,i2,i1).move_to(primitives);
              CImg<tf>::vector(i0,i5,i4,i3).move_to(primitives);
              colors.insert(2,CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)));
              ++nb_primitives;
            }
          } break;
          case 7 : {
            if ((err = std::fscanf(nfile,"%u%u%u%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,&i4,&i5,&i6,line))<7) {
              cimg::warn(_cimg_instance
                         "load_off() : Failed to read primitive %u/%u from file '%s'.",
                         cimg_instance,
                         nb_read,nb_primitives,filename?filename:"(FILE*)");

              err = std::fscanf(nfile,"%*[^\n] ");
            } else {
              err = std::sscanf(line,"%f%f%f",&c0,&c1,&c2);
              CImg<tf>::vector(i0,i4,i3,i1).move_to(primitives);
              CImg<tf>::vector(i0,i6,i5,i4).move_to(primitives);
              CImg<tf>::vector(i3,i2,i1).move_to(primitives);
              colors.insert(3,CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)));
              ++(++nb_primitives);
            }
          } break;
          case 8 : {
            if ((err = std::fscanf(nfile,"%u%u%u%u%u%u%u%u%255[^\n] ",&i0,&i1,&i2,&i3,&i4,&i5,&i6,&i7,line))<7) {
              cimg::warn(_cimg_instance
                         "load_off() : Failed to read primitive %u/%u from file '%s'.",
                         cimg_instance,
                         nb_read,nb_primitives,filename?filename:"(FILE*)");

              err = std::fscanf(nfile,"%*[^\n] ");
            } else {
              err = std::sscanf(line,"%f%f%f",&c0,&c1,&c2);
              CImg<tf>::vector(i0,i3,i2,i1).move_to(primitives);
              CImg<tf>::vector(i0,i5,i4,i3).move_to(primitives);
              CImg<tf>::vector(i0,i7,i6,i5).move_to(primitives);
              colors.insert(3,CImg<tc>::vector((tc)(c0*255),(tc)(c1*255),(tc)(c2*255)));
              ++(++nb_primitives);
            }
          } break;
          default :
            cimg::warn(_cimg_instance
                       "load_off() : Failed to read primitive %u/%u (%u vertices) from file '%s'.",
                       cimg_instance,
                       nb_read,nb_primitives,prim,filename?filename:"(FILE*)");

            err = std::fscanf(nfile,"%*[^\n] ");
          }
        }
      }
      if (!file) cimg::fclose(nfile);
      if (primitives._width!=nb_primitives)
        cimg::warn(_cimg_instance
                   "load_off() : Only %u/%u primitives read from file '%s'.",
                   cimg_instance,
                   primitives._width,nb_primitives,filename?filename:"(FILE*)");
      return *this;
    }

    //! Load a video sequence using FFMPEG's external tool 'ffmpeg'.
    CImg<T>& load_ffmpeg_external(const char *const filename, const char axis='z', const float align=0) {
      return get_load_ffmpeg_external(filename,axis,align).move_to(*this);
    }

    static CImg<T> get_load_ffmpeg_external(const char *const filename, const char axis='z', const float align=0) {
      return CImgList<T>().load_ffmpeg_external(filename).get_append(axis,align);
    }

    //! Load an image using GraphicsMagick's external tool 'gm'.
    CImg<T>& load_graphicsmagick_external(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_graphicsmagick_external() : Specified filename is (null).",
                                    cimg_instance);

      char command[1024] = { 0 }, filetmp[512] = { 0 };
      std::FILE *file = 0;
#if cimg_OS==1
      cimg_snprintf(command,sizeof(command),"%s convert \"%s\" pnm:-",cimg::graphicsmagick_path(),filename);
      file = popen(command,"r");
      if (file) {
        try { load_pnm(file); } catch (...) {
          pclose(file);
          throw CImgIOException(_cimg_instance
                                "load_graphicsmagick_external() : Failed to load file '%s' with external command 'gm'.",
                                cimg_instance,
                                filename);
        }
        pclose(file);
        return *this;
      }
#endif
      do {
        cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.pnm",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);
      cimg_snprintf(command,sizeof(command),"%s convert \"%s\" \"%s\"",cimg::graphicsmagick_path(),filename,filetmp);
      cimg::system(command,cimg::graphicsmagick_path());
      if (!(file = std::fopen(filetmp,"rb"))) {
        cimg::fclose(cimg::fopen(filename,"r"));
        throw CImgIOException(_cimg_instance
                              "load_graphicsmagick_external() : Failed to load file '%s' with external command 'gm'.",
                              cimg_instance,
                              filename);

      } else cimg::fclose(file);
      load_pnm(filetmp);
      std::remove(filetmp);
      return *this;
    }

    static CImg<T> get_load_graphicsmagick_external(const char *const filename) {
      return CImg<T>().load_graphicsmagick_external(filename);
    }

    //! Load a gzipped image file, using external tool 'gunzip'.
    CImg<T>& load_gzip_external(const char *const filename) {
      if (!filename)
        throw CImgIOException(_cimg_instance
                              "load_gzip_external() : Specified filename is (null).",
                              cimg_instance);

      char command[1024] = { 0 }, filetmp[512] = { 0 }, body[512] = { 0 };
      const char
        *const ext = cimg::split_filename(filename,body),
        *const ext2 = cimg::split_filename(body,0);

      std::FILE *file = 0;
      do {
        if (!cimg::strcasecmp(ext,"gz")) {
          if (*ext2) cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext2);
          else cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        } else {
          if (*ext) cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext);
          else cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        }
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);

      cimg_snprintf(command,sizeof(command),"%s -c \"%s\" > %s",cimg::gunzip_path(),filename,filetmp);
      cimg::system(command);
      if (!(file = std::fopen(filetmp,"rb"))) {
        cimg::fclose(cimg::fopen(filename,"r"));
        throw CImgIOException(_cimg_instance
                              "load_gzip_external() : Failed to load file '%s' with external command 'gunzip'.",
                              cimg_instance,
                              filename);

      } else cimg::fclose(file);
      load(filetmp);
      std::remove(filetmp);
      return *this;
    }

    static CImg<T> get_load_gzip_external(const char *const filename) {
      return CImg<T>().load_gzip_external(filename);
    }

    //! Load an image using ImageMagick's external tool 'convert'.
    CImg<T>& load_imagemagick_external(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_imagemagick_external() : Specified filename is (null).",
                                    cimg_instance);

      char command[1024] = { 0 }, filetmp[512] = { 0 };
      std::FILE *file = 0;
#if cimg_OS==1
      cimg_snprintf(command,sizeof(command),"%s \"%s\" pnm:-",cimg::imagemagick_path(),filename);
      file = popen(command,"r");
      if (file) {
        try { load_pnm(file); } catch (...) {
          pclose(file);
          throw CImgIOException(_cimg_instance
                                "load_imagemagick_external() : Failed to load file '%s' with external command 'convert'.",
                                cimg_instance,
                                filename);
        }
        pclose(file);
        return *this;
      }
#endif
      do {
        cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.pnm",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);
      cimg_snprintf(command,sizeof(command),"%s \"%s\" \"%s\"",cimg::imagemagick_path(),filename,filetmp);
      cimg::system(command,cimg::imagemagick_path());
      if (!(file = std::fopen(filetmp,"rb"))) {
        cimg::fclose(cimg::fopen(filename,"r"));
        throw CImgIOException(_cimg_instance
                              "load_imagemagick_external() : Failed to load file '%s' with external command 'convert'.",
                              cimg_instance,
                              filename);

      } else cimg::fclose(file);
      load_pnm(filetmp);
      std::remove(filetmp);
      return *this;
    }

    static CImg<T> get_load_imagemagick_external(const char *const filename) {
      return CImg<T>().load_imagemagick_external(filename);
    }

    //! Load a DICOM image file, using XMedcon's external tool 'medcon'.
    CImg<T>& load_medcon_external(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_medcon_external() : Specified filename is (null).",
                                    cimg_instance);

      char command[1024] = { 0 }, filetmp[512] = { 0 }, body[512] = { 0 };
      cimg::fclose(cimg::fopen(filename,"r"));
      std::FILE *file = 0;
      do {
        cimg_snprintf(filetmp,sizeof(filetmp),"%s.hdr",cimg::filenamerand());
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);
      cimg_snprintf(command,sizeof(command),"%s -w -c anlz -o %s -f %s",cimg::medcon_path(),filetmp,filename);
      cimg::system(command);
      cimg::split_filename(filetmp,body);

      cimg_snprintf(command,sizeof(command),"%s.hdr",body);
      file = std::fopen(command,"rb");
      if (!file) {
        cimg_snprintf(command,sizeof(command),"m000-%s.hdr",body);
        file = std::fopen(command,"rb");
        if (!file) {
          throw CImgIOException(_cimg_instance
                                "load_medcon_external() : Failed to load file '%s' with external command 'medcon'.",
                                cimg_instance,
                                filename);
        }
      }
      cimg::fclose(file);
      load_analyze(command);
      std::remove(command);
      cimg::split_filename(command,body);
      cimg_snprintf(command,sizeof(command),"%s.img",body);
      std::remove(command);
      return *this;
    }

    static CImg<T> get_load_medcon_external(const char *const filename) {
      return CImg<T>().load_medcon_external(filename);
    }

    //! Load a RAW Color Camera image file, using external tool 'dcraw'.
    CImg<T>& load_dcraw_external(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_dcraw_external() : Specified filename is (null).",
                                    cimg_instance);

      char command[1024] = { 0 }, filetmp[512] = { 0 };
      std::FILE *file = 0;
#if cimg_OS==1
      cimg_snprintf(command,sizeof(command),"%s -w -4 -c \"%s\"",cimg::dcraw_path(),filename);
      file = popen(command,"r");
      if (file) {
        try { load_pnm(file); } catch (...) {
          pclose(file);
          throw CImgIOException(_cimg_instance
                                "load_dcraw_external() : Failed to load file '%s' with external command 'dcraw'.",
                                cimg_instance,
                                filename);
        }
        pclose(file);
        return *this;
      }
#endif
      do {
        cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.ppm",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);
      cimg_snprintf(command,sizeof(command),"%s -w -4 -c \"%s\" > %s",cimg::dcraw_path(),filename,filetmp);
      cimg::system(command,cimg::dcraw_path());
      if (!(file = std::fopen(filetmp,"rb"))) {
        cimg::fclose(cimg::fopen(filename,"r"));
        throw CImgIOException(_cimg_instance
                              "load_dcraw_external() : Failed to load file '%s' with external command 'dcraw'.",
                              cimg_instance,
                              filename);

      } else cimg::fclose(file);
      load_pnm(filetmp);
      std::remove(filetmp);
      return *this;
    }

    static CImg<T> get_load_dcraw_external(const char *const filename) {
      return CImg<T>().load_dcraw_external(filename);
    }

    //! Load an image from a camera stream, using OpenCV.
    CImg<T>& load_camera(const int camera_index=-1, const unsigned int skip_frames=0, const bool release_camera=false) {
#ifdef cimg_use_opencv
      const int ind = camera_index + 1;
      if (ind<0 || ind>255)
        throw CImgArgumentException(_cimg_instance
                                    "load_camera() : Invalid request for camera #%d.",
                                    cimg_instance,
                                    camera_index);
      static CvCapture *capture[256] = { 0 };
      if (release_camera) {
        if (capture[ind]) cvReleaseCapture(&(capture[ind]));
        capture[ind] = 0;
        return *this;
      }
      if (!capture[ind]) {
        capture[ind] = cvCreateCameraCapture(camera_index);
        if (!capture[ind]) {
          if (camera_index>=0)
            throw CImgIOException(_cimg_instance
                                  "load_camera() : Failed to initialize camera #%d.",
                                  cimg_instance,
                                  camera_index);
          else
            throw CImgIOException(_cimg_instance
                                  "load_camera() : Failed to initialize default camera.",
                                  cimg_instance);
        }
      }
      const IplImage *img = 0;
      for (unsigned int i = 0; i<skip_frames; ++i) img = cvQueryFrame(capture[ind]);
      img = cvQueryFrame(capture[ind]);
      if (img) {
        const int step = (int)(img->widthStep - 3*img->width);
        assign(img->width,img->height,1,3);
        const unsigned char* ptrs = (unsigned char*)img->imageData;
        T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
        if (step>0) cimg_forY(*this,y) {
            cimg_forX(*this,x) { *(ptr_b++) = (T)*(ptrs++); *(ptr_g++) = (T)*(ptrs++); *(ptr_r++) = (T)*(ptrs++); }
            ptrs+=step;
          } else for (unsigned int siz = img->width*img->height; siz; --siz) { *(ptr_b++) = (T)*(ptrs++); *(ptr_g++) = (T)*(ptrs++); *(ptr_r++) = (T)*(ptrs++); }
      }
#else
      cimg::unused(camera_index,skip_frames,release_camera);
      throw CImgIOException(_cimg_instance
                            "load_camera() : This function requires the OpenCV library to run "
                            "(macro 'cimg_use_opencv' must be defined).",
                            cimg_instance);
#endif
      return *this;
    }

    static CImg<T> get_load_camera(const int camera_index=-1, const unsigned int skip_frames=0, const bool release_camera=false) {
      return CImg<T>().load_camera(camera_index,skip_frames,release_camera);
    }

    //! Load an image using ImageMagick's or GraphicsMagick's executables.
    CImg<T>& load_other(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "load_other() : Specified filename is (null).",
                                    cimg_instance);

      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try { load_magick(filename); }
      catch (CImgException&) {
        try { load_imagemagick_external(filename); }
        catch (CImgException&) {
          try { load_graphicsmagick_external(filename); }
          catch (CImgException&) {
            assign();
          }
        }
      }
      cimg::exception_mode() = omode;
      if (is_empty())
        throw CImgIOException(_cimg_instance
                              "load_other() : Failed to load file '%s'. Format is not natively supported, and no external commands succeeded.",
                              cimg_instance,
                              filename);
      return *this;
    }

    static CImg<T> get_load_other(const char *const filename) {
      return CImg<T>().load_other(filename);
    }

    //@}
    //---------------------------
    //
    //! \name Data Output
    //@{
    //---------------------------

    //! Display informations about the image on the standard error output.
    /**
       \param title Name for the considered image (optional).
       \param display_stats Compute and display image statistics (optional).
    **/
    const CImg<T>& print(const char *const title=0, const bool display_stats=true) const {
      int xm = 0, ym = 0, zm = 0, vm = 0, xM = 0, yM = 0, zM = 0, vM = 0;
      static CImg<doubleT> st;
      if (!is_empty() && display_stats) {
        st = get_stats();
        xm = (int)st[4]; ym = (int)st[5], zm = (int)st[6], vm = (int)st[7];
        xM = (int)st[8]; yM = (int)st[9], zM = (int)st[10], vM = (int)st[11];
      }
      const unsigned int siz = size(), msiz = siz*sizeof(T), siz1 = siz-1;
      const unsigned int mdisp = msiz<8*1024?0:(msiz<8*1024*1024?1:2), width1 = _width-1;

      char _title[64] = { 0 };
      if (!title) cimg_snprintf(_title,sizeof(_title),"CImg<%s>",pixel_type());

      std::fprintf(cimg::output(),"%s: this = %p, size = (%u,%u,%u,%u) [%u %s], data = (%s*)%p",
                   title?title:_title,(void*)this,_width,_height,_depth,_spectrum,
                   mdisp==0?msiz:(mdisp==1?(msiz>>10):(msiz>>20)),
                   mdisp==0?"b":(mdisp==1?"Kb":"Mb"),
                   pixel_type(),(void*)begin());
      if (_data) std::fprintf(cimg::output(),"..%p (%s) = [ ",(void*)((char*)end()-1),_is_shared?"shared":"non-shared");
      else std::fprintf(cimg::output()," (%s) = [ ",_is_shared?"shared":"non-shared");

      if (!is_empty()) cimg_foroff(*this,off) {
        std::fprintf(cimg::output(),cimg::type<T>::format(),cimg::type<T>::format(_data[off]));
        if (off!=siz1) std::fprintf(cimg::output(),"%s",off%_width==width1?" ; ":" ");
        if (off==7 && siz>16) { off = siz1-8; if (off!=7) std::fprintf(cimg::output(),"... "); }
      }
      if (!is_empty() && display_stats)
        std::fprintf(cimg::output()," ], min = %g, max = %g, mean = %g, std = %g, coords(min) = (%u,%u,%u,%u), coords(max) = (%u,%u,%u,%u).\n",
                     st[0],st[1],st[2],std::sqrt(st[3]),xm,ym,zm,vm,xM,yM,zM,vM);
      else std::fprintf(cimg::output(),"%s].\n",is_empty()?"":" ");
      std::fflush(cimg::output());
      return *this;
    }

    //! Display an image into a CImgDisplay window.
    const CImg<T>& display(CImgDisplay& disp) const {
      disp.display(*this);
      return *this;
    }

    //! Display an image in a window with a title \p title, and wait a '_is_closed' or 'keyboard' event.\n
    const CImg<T>& display(CImgDisplay &disp, const bool display_info) const {
      return _display(disp,0,display_info,false);
    }

    //! Display an image in a window with a title \p title, and wait a '_is_closed' or 'keyboard' event.\n
    const CImg<T>& display(const char *const title=0, const bool display_info=true) const {
      CImgDisplay disp;
      return _display(disp,title,display_info,false);
    }

    const CImg<T>& _display(CImgDisplay &disp, const char *const title,
                            const bool display_info, const bool exit_on_simpleclick) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "display() : Empty instance.",
                                    cimg_instance);

      unsigned int oldw = 0, oldh = 0, XYZ[3], key = 0;
      int x0 = 0, y0 = 0, z0 = 0, x1 = width() - 1, y1 = height() - 1, z1 = depth() - 1;

      if (!disp) {
        disp.assign(cimg_fitscreen(_width,_height,_depth),title?title:0,1);
        if (!title) disp.set_title("CImg<%s> (%ux%ux%ux%u)",pixel_type(),_width,_height,_depth,_spectrum);
      } else if (title) disp.set_title("%s",title);
      disp.show().flush();

      const CImg<char> dtitle = CImg<char>::string(disp.title());
      if (display_info) print(dtitle);

      CImg<T> zoom;
      for (bool reset_view = true, resize_disp = false, is_first_select = true; !key && !disp.is_closed(); ) {
        if (reset_view) {
          XYZ[0] = (x0 + x1)/2; XYZ[1] = (y0 + y1)/2; XYZ[2] = (z0 + z1)/2;
          x0 = 0; y0 = 0; z0 = 0; x1 = _width - 1; y1 = _height-1; z1 = _depth-1;
          oldw = disp.width(); oldh = disp.height();
          reset_view = false;
        }
        if (!x0 && !y0 && !z0 && x1==width()-1 && y1==height()-1 && z1==depth()-1) zoom.assign();
        else zoom = get_crop(x0,y0,z0,x1,y1,z1);

        const unsigned int
          dx = 1 + x1 - x0, dy = 1 + y1 - y0, dz = 1 + z1 - z0,
          tw = dx + (dz>1?dz:0), th = dy + (dz>1?dz:0);
        if (!disp.is_fullscreen() && resize_disp) {
          const unsigned int
            ttw = tw*disp.width()/oldw, tth = th*disp.height()/oldh,
            dM = cimg::max(ttw,tth), diM = (unsigned int)cimg::max(disp.width(),disp.height()),
            imgw = cimg::max(16U,ttw*diM/dM), imgh = cimg::max(16U,tth*diM/dM);
          disp.set_fullscreen(false).resize(cimg_fitscreen(imgw,imgh,1),false);
          resize_disp = false;
        }
        oldw = tw; oldh = th;

        bool
          go_up = false, go_down = false, go_left = false, go_right = false,
          go_inc = false, go_dec = false, go_in = false, go_out = false,
          go_in_center = false;
        const CImg<T>& visu = zoom?zoom:*this;
        const CImg<intT> selection = visu._get_select(disp,0,2,XYZ,x0,y0,z0,is_first_select);
        is_first_select = false;

        if (disp.wheel()) {
          if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { go_out = !(go_in = disp.wheel()>0); go_in_center = false; }
          else if (disp.is_keySHIFTLEFT() || disp.is_keySHIFTRIGHT()) { go_right = !(go_left = disp.wheel()>0); }
          else if (disp.is_keyALT() || disp.is_keyALTGR() || _depth==1) { go_down = !(go_up = disp.wheel()>0); }
          disp.set_wheel();
        }

        const int
          sx0 = selection(0), sy0 = selection(1), sz0 = selection(2),
          sx1 = selection(3), sy1 = selection(4), sz1 = selection(5);
        if (sx0>=0 && sy0>=0 && sz0>=0 && sx1>=0 && sy1>=0 && sz1>=0) {
          x1 = x0 + sx1; y1 = y0 + sy1; z1 = z0 + sz1; x0+=sx0; y0+=sy0; z0+=sz0;
          if (sx0==sx1 && sy0==sy1 && sz0==sz1) {
            if (exit_on_simpleclick && !zoom) break; else reset_view = true;
          }
          resize_disp = true;
        } else switch (key = disp.key()) {
#if cimg_OS!=2
          case cimg::keyCTRLRIGHT : case cimg::keySHIFTRIGHT :
#endif
          case 0 : case cimg::keyCTRLLEFT : case cimg::keyPAD5 : case cimg::keySHIFTLEFT :
#if cimg_OS!=2
          case cimg::keyALTGR :
#endif
          case cimg::keyALT : key = 0; break;
          case cimg::keyP : if (visu._depth>1 && (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT())) { // Special mode : play stack of frames
              const unsigned int
                w1 = visu._width*disp.width()/(visu._width+(visu._depth>1?visu._depth:0)),
                h1 = visu._height*disp.height()/(visu._height+(visu._depth>1?visu._depth:0));
              float frame_timing = 5;
              bool is_stopped = false;
              disp.set_key(key,false).set_wheel().resize(cimg_fitscreen(w1,h1,1),false); key = 0;
              for (unsigned int timer = 0; !key && !disp.is_closed() && !disp.button(); ) {
                if (disp.is_resized()) disp.resize(false);
                if (!timer) {
                  visu.get_slice(XYZ[2]).display(disp.set_title("%s | z=%d",dtitle.data(),XYZ[2]));
                  (++XYZ[2])%=visu._depth;
                }
                if (!is_stopped) { if (++timer>(unsigned int)frame_timing) timer = 0; } else timer = ~0U;
                if (disp.wheel()) { frame_timing-=disp.wheel()/3.0f; disp.set_wheel(); }
                switch (key = disp.key()) {
#if cimg_OS!=2
                case cimg::keyCTRLRIGHT :
#endif
                case cimg::keyCTRLLEFT : key = 0; break;
                case cimg::keyPAGEUP : frame_timing-=0.3f; key = 0; break;
                case cimg::keyPAGEDOWN : frame_timing+=0.3f; key = 0; break;
                case cimg::keySPACE : is_stopped = !is_stopped; disp.set_key(key,false); key = 0; break;
                case cimg::keyARROWLEFT : case cimg::keyARROWUP : is_stopped = true; timer = 0; key = 0; break;
                case cimg::keyARROWRIGHT : case cimg::keyARROWDOWN : is_stopped = true; (XYZ[2]+=visu._depth-2)%=visu._depth; timer = 0; key = 0; break;
                case cimg::keyD : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
                    disp.set_fullscreen(false).resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
                                                      CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false);
                    disp.set_key(key,false); key = 0;
                  } break;
                case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
                    disp.set_fullscreen(false).resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false).set_key(key,false); key = 0;
                  } break;
                case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
                    disp.set_fullscreen(false).resize(cimg_fitscreen(_width,_height,_depth),false).set_key(key,false); key = 0;
                  } break;
                case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
                    disp.resize(disp.screen_width(),disp.screen_height(),false).toggle_fullscreen().set_key(key,false); key = 0;
                  } break;
                }
                frame_timing = frame_timing<1?1:(frame_timing>39?39:frame_timing);
                disp.wait(20);
              }
              const unsigned int
                w2 = (visu._width + (visu._depth>1?visu._depth:0))*disp.width()/visu._width,
                h2 = (visu._height + (visu._depth>1?visu._depth:0))*disp.height()/visu._height;
              disp.resize(cimg_fitscreen(w2,h2,1),false).set_title(dtitle.data()).set_key().set_button().set_wheel();
              key = 0;
            } break;
          case cimg::keyHOME : reset_view = resize_disp = true; key = 0; break;
          case cimg::keyPADADD : go_in = true; go_in_center = true; key = 0; break;
          case cimg::keyPADSUB : go_out = true; key = 0; break;
          case cimg::keyARROWLEFT : case cimg::keyPAD4: go_left = true; key = 0; break;
          case cimg::keyARROWRIGHT : case cimg::keyPAD6: go_right = true; key = 0; break;
          case cimg::keyARROWUP : case cimg::keyPAD8: go_up = true; key = 0; break;
          case cimg::keyARROWDOWN : case cimg::keyPAD2: go_down = true; key = 0; break;
          case cimg::keyPAD7 : go_up = go_left = true; key = 0; break;
          case cimg::keyPAD9 : go_up = go_right = true; key = 0; break;
          case cimg::keyPAD1 : go_down = go_left = true; key = 0; break;
          case cimg::keyPAD3 : go_down = go_right = true; key = 0; break;
          case cimg::keyPAGEUP : go_inc = true; key = 0; break;
          case cimg::keyPAGEDOWN : go_dec = true; key = 0; break;
          }
        if (go_in) {
          const int
            mx = go_in_center?disp.width()/2:disp.mouse_x(),
            my = go_in_center?disp.height()/2:disp.mouse_y(),
            mX = mx*(_width+(_depth>1?_depth:0))/disp.width(),
            mY = my*(_height+(_depth>1?_depth:0))/disp.height();
          int X = XYZ[0], Y = XYZ[1], Z = XYZ[2];
          if (mX<width() && mY<height())  { X = x0 + mX*(1+x1-x0)/_width; Y = y0 + mY*(1+y1-y0)/_height; Z = XYZ[2]; }
          if (mX<width() && mY>=height()) { X = x0 + mX*(1+x1-x0)/_width; Z = z0 + (mY-_height)*(1+z1-z0)/_depth; Y = XYZ[1]; }
          if (mX>=width() && mY<height()) { Y = y0 + mY*(1+y1-y0)/_height; Z = z0 + (mX-_width)*(1+z1-z0)/_depth; X = XYZ[0]; }
          if (x1-x0>4) { x0 = X - 7*(X-x0)/8; x1 = X + 7*(x1-X)/8; }
          if (y1-y0>4) { y0 = Y - 7*(Y-y0)/8; y1 = Y + 7*(y1-Y)/8; }
          if (z1-z0>4) { z0 = Z - 7*(Z-z0)/8; z1 = Z + 7*(z1-Z)/8; }
        }
        if (go_out) {
          const int
            deltax = (x1-x0)/8, deltay = (y1-y0)/8, deltaz = (z1-z0)/8,
            ndeltax = deltax?deltax:(_width>1?1:0),
            ndeltay = deltay?deltay:(_height>1?1:0),
            ndeltaz = deltaz?deltaz:(_depth>1?1:0);
          x0-=ndeltax; y0-=ndeltay; z0-=ndeltaz;
          x1+=ndeltax; y1+=ndeltay; z1+=ndeltaz;
          if (x0<0) { x1-=x0; x0 = 0; if (x1>=width()) x1 = width() - 1; }
          if (y0<0) { y1-=y0; y0 = 0; if (y1>=height()) y1 = height() - 1; }
          if (z0<0) { z1-=z0; z0 = 0; if (z1>=depth()) z1 = depth() - 1; }
          if (x1>=width()) { x0-=(x1-width()+1); x1 = width()-1; if (x0<0) x0 = 0; }
          if (y1>=height()) { y0-=(y1-height()+1); y1 = height()-1; if (y0<0) y0 = 0; }
          if (z1>=depth()) { z0-=(z1-depth()+1); z1 = depth()-1; if (z0<0) z0 = 0; }
        }
        if (go_left) {
          const int delta = (x1-x0)/5, ndelta = delta?delta:(_width>1?1:0);
          if (x0-ndelta>=0) { x0-=ndelta; x1-=ndelta; }
          else { x1-=x0; x0 = 0; }
        }
        if (go_right) {
          const int delta = (x1-x0)/5, ndelta = delta?delta:(_width>1?1:0);
          if (x1+ndelta<width()) { x0+=ndelta; x1+=ndelta; }
          else { x0+=(width()-1-x1); x1 = width()-1; }
        }
        if (go_up) {
          const int delta = (y1-y0)/5, ndelta = delta?delta:(_height>1?1:0);
          if (y0-ndelta>=0) { y0-=ndelta; y1-=ndelta; }
          else { y1-=y0; y0 = 0; }
        }
        if (go_down) {
          const int delta = (y1-y0)/5, ndelta = delta?delta:(_height>1?1:0);
          if (y1+ndelta<height()) { y0+=ndelta; y1+=ndelta; }
          else { y0+=(height()-1-y1); y1 = height()-1; }
        }
        if (go_inc) {
          const int delta = (z1-z0)/5, ndelta = delta?delta:(_depth>1?1:0);
          if (z0-ndelta>=0) { z0-=ndelta; z1-=ndelta; }
          else { z1-=z0; z0 = 0; }
        }
        if (go_dec) {
          const int delta = (z1-z0)/5, ndelta = delta?delta:(_depth>1?1:0);
          if (z1+ndelta<depth()) { z0+=ndelta; z1+=ndelta; }
          else { z0+=(depth()-1-z1); z1 = depth()-1; }
        }
      }
      disp.set_key(key);
      return *this;
    }

    //! High-level interface for displaying a 3d object.
    template<typename tp, typename tf, typename tc, typename to>
    const CImg<T>& display_object3d(CImgDisplay& disp,
                                    const CImg<tp>& vertices,
                                    const CImgList<tf>& primitives,
                                    const CImgList<tc>& colors,
                                    const to& opacities,
                                    const bool centering=true,
                                    const int render_static=4, const int render_motion=1,
                                    const bool double_sided=true, const float focale=500,
                                    const float light_x=0, const float light_y=0, const float light_z=-5000,
                                    const float specular_light=0.2f, const float specular_shine=0.1f,
                                    const bool display_axes=true, float *const pose_matrix=0) const {
      return _display_object3d(disp,0,vertices,primitives,colors,opacities,centering,render_static,
                               render_motion,double_sided,focale,
                               light_x,light_y,light_z,specular_light,specular_shine,
                               display_axes,pose_matrix);
    }

    //! High-level interface for displaying a 3d object.
    template<typename tp, typename tf, typename tc, typename to>
    const CImg<T>& display_object3d(const char *const title,
                                    const CImg<tp>& vertices,
                                    const CImgList<tf>& primitives,
                                    const CImgList<tc>& colors,
                                    const to& opacities,
                                    const bool centering=true,
                                    const int render_static=4, const int render_motion=1,
                                    const bool double_sided=true, const float focale=500,
                                    const float light_x=0, const float light_y=0, const float light_z=-5000,
                                    const float specular_light=0.2f, const float specular_shine=0.1f,
                                    const bool display_axes=true, float *const pose_matrix=0) const {
      CImgDisplay disp;
      return _display_object3d(disp,title,vertices,primitives,colors,opacities,centering,render_static,
                               render_motion,double_sided,focale,
                               light_x,light_y,light_z,specular_light,specular_shine,
                               display_axes,pose_matrix);
    }

    //! High-level interface for displaying a 3d object.
    template<typename tp, typename tf, typename tc>
    const CImg<T>& display_object3d(CImgDisplay &disp,
                                    const CImg<tp>& vertices,
                                    const CImgList<tf>& primitives,
                                    const CImgList<tc>& colors,
                                    const bool centering=true,
                                    const int render_static=4, const int render_motion=1,
                                    const bool double_sided=true, const float focale=500,
                                    const float light_x=0, const float light_y=0, const float light_z=-5000,
                                    const float specular_light=0.2f, const float specular_shine=0.1f,
                                    const bool display_axes=true, float *const pose_matrix=0) const {
      return display_object3d(disp,vertices,primitives,colors,CImgList<floatT>(),centering,
                              render_static,render_motion,double_sided,focale,
                              light_x,light_y,light_z,specular_light,specular_shine,
                              display_axes,pose_matrix);
    }

    //! High-level interface for displaying a 3d object.
    template<typename tp, typename tf, typename tc>
    const CImg<T>& display_object3d(const char *const title,
                                    const CImg<tp>& vertices,
                                    const CImgList<tf>& primitives,
                                    const CImgList<tc>& colors,
                                    const bool centering=true,
                                    const int render_static=4, const int render_motion=1,
                                    const bool double_sided=true, const float focale=500,
                                    const float light_x=0, const float light_y=0, const float light_z=-5000,
                                    const float specular_light=0.2f, const float specular_shine=0.1f,
                                    const bool display_axes=true, float *const pose_matrix=0) const {
      return display_object3d(title,vertices,primitives,colors,CImgList<floatT>(),centering,
                              render_static,render_motion,double_sided,focale,
                              light_x,light_y,light_z,specular_light,specular_shine,
                              display_axes,pose_matrix);
    }

    //! High-level interface for displaying a 3d object.
    template<typename tp, typename tf>
    const CImg<T>& display_object3d(CImgDisplay &disp,
                                    const CImg<tp>& vertices,
                                    const CImgList<tf>& primitives,
                                    const bool centering=true,
                                    const int render_static=4, const int render_motion=1,
                                    const bool double_sided=true, const float focale=500,
                                    const float light_x=0, const float light_y=0, const float light_z=-5000,
                                    const float specular_light=0.2f, const float specular_shine=0.1f,
                                    const bool display_axes=true, float *const pose_matrix=0) const {
      return display_object3d(disp,vertices,primitives,CImgList<T>(),centering,
                              render_static,render_motion,double_sided,focale,
                              light_x,light_y,light_z,specular_light,specular_shine,
                              display_axes,pose_matrix);
    }

    //! High-level interface for displaying a 3d object.
    template<typename tp, typename tf>
    const CImg<T>& display_object3d(const char *const title,
                                    const CImg<tp>& vertices,
                                    const CImgList<tf>& primitives,
                                    const bool centering=true,
                                    const int render_static=4, const int render_motion=1,
                                    const bool double_sided=true, const float focale=500,
                                    const float light_x=0, const float light_y=0, const float light_z=-5000,
                                    const float specular_light=0.2f, const float specular_shine=0.1f,
                                    const bool display_axes=true, float *const pose_matrix=0) const {
      return display_object3d(title,vertices,primitives,CImgList<T>(),centering,
                              render_static,render_motion,double_sided,focale,
                              light_x,light_y,light_z,specular_light,specular_shine,
                              display_axes,pose_matrix);
    }

    //! High-level interface for displaying a 3d object.
    template<typename tp>
    const CImg<T>& display_object3d(CImgDisplay &disp,
                                    const CImg<tp>& vertices,
                                    const bool centering=true,
                                    const int render_static=4, const int render_motion=1,
                                    const bool double_sided=true, const float focale=500,
                                    const float light_x=0, const float light_y=0, const float light_z=-5000,
                                    const float specular_light=0.2f, const float specular_shine=0.1f,
                                    const bool display_axes=true, float *const pose_matrix=0) const {
      return display_object3d(disp,vertices,CImgList<uintT>(),centering,
                              render_static,render_motion,double_sided,focale,
                              light_x,light_y,light_z,specular_light,specular_shine,
                              display_axes,pose_matrix);
    }

    //! High-level interface for displaying a 3d object.
    template<typename tp>
    const CImg<T>& display_object3d(const char *const title,
                                    const CImg<tp>& vertices,
                                    const bool centering=true,
                                    const int render_static=4, const int render_motion=1,
                                    const bool double_sided=true, const float focale=500,
                                    const float light_x=0, const float light_y=0, const float light_z=-5000,
                                    const float specular_light=0.2f, const float specular_shine=0.1f,
                                    const bool display_axes=true, float *const pose_matrix=0) const {
      return display_object3d(title,vertices,CImgList<uintT>(),centering,
                              render_static,render_motion,double_sided,focale,
                              light_x,light_y,light_z,specular_light,specular_shine,
                              display_axes,pose_matrix);
    }

    template<typename tp, typename tf, typename tc, typename to>
    const CImg<T>& _display_object3d(CImgDisplay& disp, const char *const title,
                                     const CImg<tp>& vertices,
                                     const CImgList<tf>& primitives,
                                     const CImgList<tc>& colors,
                                     const to& opacities,
                                     const bool centering,
                                     const int render_static, const int render_motion,
                                     const bool double_sided, const float focale,
                                     const float light_x, const float light_y, const float light_z,
                                     const float specular_light, const float specular_shine,
                                     const bool display_axes, float *const pose_matrix) const {
      typedef typename cimg::superset<tp,float>::type tpfloat;

      // Check input arguments
      if (is_empty()) {
        if (disp) return CImg<T>(disp.width(),disp.height(),1,(colors && colors[0].size()==1)?1:3,0).
                    _display_object3d(disp,title,vertices,primitives,colors,opacities,centering,
                                      render_static,render_motion,double_sided,focale,
                                      light_x,light_y,light_z,specular_light,specular_shine,
                                      display_axes,pose_matrix);
        else return CImg<T>(1,2,1,1,64,128).resize(cimg_fitscreen(640,480,1),1,(colors && colors[0].size()==1)?1:3,3).
               _display_object3d(disp,title,vertices,primitives,colors,opacities,centering,
                                 render_static,render_motion,double_sided,focale,
                                 light_x,light_y,light_z,specular_light,specular_shine,
                                 display_axes,pose_matrix);
      } else { if (disp) disp.resize(*this,false); }
      char error_message[1024] = { 0 };
      if (!vertices.is_object3d(primitives,colors,opacities,true,error_message))
        throw CImgArgumentException(_cimg_instance
                                    "display_object3d() : Invalid specified 3d object (%u,%u) (%s).",
                                    cimg_instance,vertices._width,primitives._width,error_message);
      if (vertices._width && !primitives) {
        CImgList<tf> nprimitives(vertices._width,1,1,1,1);
        cimglist_for(nprimitives,l) nprimitives(l,0) = l;
        return _display_object3d(disp,title,vertices,nprimitives,colors,opacities,centering,
                                 render_static,render_motion,double_sided,focale,
                                 light_x,light_y,light_z,specular_light,specular_shine,
                                 display_axes,pose_matrix);
      }
      if (!disp) {
        disp.assign(cimg_fitscreen(_width,_height,_depth),title?title:0,3);
        if (!title) disp.set_title("CImg<%s> (%u vertices, %u primitives)",pixel_type(),vertices._width,primitives._width);
      } else if (title) disp.set_title("%s",title);

      // Init 3d objects and compute object statistics
      CImg<floatT>
        pose,
        rotated_vertices(vertices._width,3),
        bbox_vertices, rotated_bbox_vertices,
        axes_vertices, rotated_axes_vertices,
        bbox_opacities, axes_opacities;
      CImgList<uintT> bbox_primitives, axes_primitives;
      CImgList<tf> reverse_primitives;
      CImgList<T> bbox_colors, bbox_colors2, axes_colors;
      unsigned int ns_width = 0, ns_height = 0;
      int _double_sided = (int)double_sided;
      bool ndisplay_axes = display_axes;
      const CImg<T>
        background_color(1,1,1,_spectrum,0),
        foreground_color(1,1,1,_spectrum,255);
      float
        Xoff = 0, Yoff = 0, Zoff = 0, sprite_scale = 1,
        xm = 0, xM = vertices?vertices.get_shared_line(0).max_min(xm):0,
        ym = 0, yM = vertices?vertices.get_shared_line(1).max_min(ym):0,
        zm = 0, zM = vertices?vertices.get_shared_line(2).max_min(zm):0;
      const float delta = cimg::max(xM-xm,yM-ym,zM-zm);

      rotated_bbox_vertices = bbox_vertices.assign(8,3,1,1,
                                                   xm,xM,xM,xm,xm,xM,xM,xm,
                                                   ym,ym,yM,yM,ym,ym,yM,yM,
                                                   zm,zm,zm,zm,zM,zM,zM,zM);
      bbox_primitives.assign(6,1,4,1,1, 0,3,2,1, 4,5,6,7, 1,2,6,5, 0,4,7,3, 0,1,5,4, 2,3,7,6);
      bbox_colors.assign(6,_spectrum,1,1,1,background_color[0]);
      bbox_colors2.assign(6,_spectrum,1,1,1,foreground_color[0]);
      bbox_opacities.assign(bbox_colors._width,1,1,1,0.3f);

      rotated_axes_vertices = axes_vertices.assign(7,3,1,1,
                                                   0,20,0,0,22,-6,-6,
                                                   0,0,20,0,-6,22,-6,
                                                   0,0,0,20,0,0,22);
      axes_opacities.assign(3,1,1,1,1);
      axes_colors.assign(3,_spectrum,1,1,1,foreground_color[0]);
      axes_primitives.assign(3,1,2,1,1, 0,1, 0,2, 0,3);

      // Begin user interaction loop
      CImg<T> visu0(*this), visu;
      CImg<tpfloat> zbuffer(visu0.width(),visu0.height(),1,1,0);
      bool init_pose = true, clicked = false, redraw = true;
      unsigned int key = 0;
      int
        x0 = 0, y0 = 0, x1 = 0, y1 = 0,
        nrender_static = render_static,
        nrender_motion = render_motion;
      disp.show().flush();

      while (!disp.is_closed() && !key) {

        // Init object pose
        if (init_pose) {
          const float
            ratio = delta>0?(2.0f*cimg::min(disp.width(),disp.height())/(3.0f*delta)):1,
            dx = (xM + xm)/2, dy = (yM + ym)/2, dz = (zM + zm)/2;
          if (centering)
            CImg<floatT>(4,3,1,1, ratio,0.,0.,-ratio*dx, 0.,ratio,0.,-ratio*dy, 0.,0.,ratio,-ratio*dz).move_to(pose);
          else CImg<floatT>(4,3,1,1, 1,0,0,0, 0,1,0,0, 0,0,1,0).move_to(pose);
          if (pose_matrix) {
            CImg<floatT> pose0(pose_matrix,4,3,1,1,false);
            pose0.resize(4,4,1,1,0); pose.resize(4,4,1,1,0);
            pose0(3,3) = pose(3,3) = 1;
            (pose0*pose).get_crop(0,0,3,2).move_to(pose);
            Xoff = pose_matrix[12]; Yoff = pose_matrix[13]; Zoff = pose_matrix[14]; sprite_scale = pose_matrix[15];
          } else { Xoff = Yoff = Zoff = 0; sprite_scale = 1; }
          init_pose = false;
          redraw = true;
        }

        // Rotate and draw 3d object
        if (redraw) {
          const float
            r00 = pose(0,0), r10 = pose(1,0), r20 = pose(2,0), r30 = pose(3,0),
            r01 = pose(0,1), r11 = pose(1,1), r21 = pose(2,1), r31 = pose(3,1),
            r02 = pose(0,2), r12 = pose(1,2), r22 = pose(2,2), r32 = pose(3,2);
          if ((clicked && nrender_motion>=0) || (!clicked && nrender_static>=0))
            cimg_forX(vertices,l) {
              const float x = (float)vertices(l,0), y = (float)vertices(l,1), z = (float)vertices(l,2);
              rotated_vertices(l,0) = r00*x + r10*y + r20*z + r30;
              rotated_vertices(l,1) = r01*x + r11*y + r21*z + r31;
              rotated_vertices(l,2) = r02*x + r12*y + r22*z + r32;
            }
          else cimg_forX(bbox_vertices,l) {
              const float x = bbox_vertices(l,0), y = bbox_vertices(l,1), z = bbox_vertices(l,2);
              rotated_bbox_vertices(l,0) = r00*x + r10*y + r20*z + r30;
              rotated_bbox_vertices(l,1) = r01*x + r11*y + r21*z + r31;
              rotated_bbox_vertices(l,2) = r02*x + r12*y + r22*z + r32;
            }

          // Draw object
          visu = visu0;
          if ((clicked && nrender_motion<0) || (!clicked && nrender_static<0))
            visu.draw_object3d(Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
                               rotated_bbox_vertices,bbox_primitives,bbox_colors,bbox_opacities,2,false,focale).
              draw_object3d(Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
                            rotated_bbox_vertices,bbox_primitives,bbox_colors2,1,false,focale);
          else visu._draw_object3d((void*)0,(!clicked && nrender_static>0)?zbuffer.fill(0):CImg<tpfloat>::empty(),
                                   Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
                                   rotated_vertices,reverse_primitives?reverse_primitives:primitives,
                                   colors,opacities,clicked?nrender_motion:nrender_static,_double_sided==1,focale,
                                   width()/2.0f+light_x,height()/2.0f+light_y,light_z,specular_light,specular_shine,
                                   sprite_scale);
          // Draw axes
          if (ndisplay_axes) {
            const float
              n = (float)std::sqrt(1e-8 + r00*r00 + r01*r01 + r02*r02),
              _r00 = r00/n, _r10 = r10/n, _r20 = r20/n,
              _r01 = r01/n, _r11 = r11/n, _r21 = r21/n,
              _r02 = r01/n, _r12 = r12/n, _r22 = r22/n,
              Xaxes = 25, Yaxes = visu._height - 38.0f;
            cimg_forX(axes_vertices,l) {
              const float
                x = axes_vertices(l,0),
                y = axes_vertices(l,1),
                z = axes_vertices(l,2);
              rotated_axes_vertices(l,0) = _r00*x + _r10*y + _r20*z;
              rotated_axes_vertices(l,1) = _r01*x + _r11*y + _r21*z;
              rotated_axes_vertices(l,2) = _r02*x + _r12*y + _r22*z;
            }
            axes_opacities(0,0) = (rotated_axes_vertices(1,2)>0)?0.5f:1.0f;
            axes_opacities(1,0) = (rotated_axes_vertices(2,2)>0)?0.5f:1.0f;
            axes_opacities(2,0) = (rotated_axes_vertices(3,2)>0)?0.5f:1.0f;
            visu.draw_object3d(Xaxes,Yaxes,0,rotated_axes_vertices,axes_primitives,axes_colors,axes_opacities,1,false,focale).
              draw_text((int)(Xaxes+rotated_axes_vertices(4,0)),
                        (int)(Yaxes+rotated_axes_vertices(4,1)),
                        "X",axes_colors[0]._data,0,axes_opacities(0,0),13).
              draw_text((int)(Xaxes+rotated_axes_vertices(5,0)),
                        (int)(Yaxes+rotated_axes_vertices(5,1)),
                        "Y",axes_colors[1]._data,0,axes_opacities(1,0),13).
              draw_text((int)(Xaxes+rotated_axes_vertices(6,0)),
                        (int)(Yaxes+rotated_axes_vertices(6,1)),
                        "Z",axes_colors[2]._data,0,axes_opacities(2,0),13);
          }
          visu.display(disp);
          if (!clicked || nrender_motion==nrender_static) redraw = false;
        }

        // Handle user interaction
        disp.wait();
        if ((disp.button() || disp.wheel()) && disp.mouse_x()>=0 && disp.mouse_y()>=0) {
          redraw = true;
          if (!clicked) { x0 = x1 = disp.mouse_x(); y0 = y1 = disp.mouse_y(); if (!disp.wheel()) clicked = true; }
          else { x1 = disp.mouse_x(); y1 = disp.mouse_y(); }
          if (disp.button()&1) {
            const float
              R = 0.45f*cimg::min(disp.width(),disp.height()),
              R2 = R*R,
              u0 = (float)(x0-disp.width()/2),
              v0 = (float)(y0-disp.height()/2),
              u1 = (float)(x1-disp.width()/2),
              v1 = (float)(y1-disp.height()/2),
              n0 = (float)std::sqrt(u0*u0+v0*v0),
              n1 = (float)std::sqrt(u1*u1+v1*v1),
              nu0 = n0>R?(u0*R/n0):u0,
              nv0 = n0>R?(v0*R/n0):v0,
              nw0 = (float)std::sqrt(cimg::max(0,R2-nu0*nu0-nv0*nv0)),
              nu1 = n1>R?(u1*R/n1):u1,
              nv1 = n1>R?(v1*R/n1):v1,
              nw1 = (float)std::sqrt(cimg::max(0,R2-nu1*nu1-nv1*nv1)),
              u = nv0*nw1-nw0*nv1,
              v = nw0*nu1-nu0*nw1,
              w = nv0*nu1-nu0*nv1,
              n = (float)std::sqrt(u*u+v*v+w*w),
              alpha = (float)std::asin(n/R2);
            (CImg<floatT>::rotation_matrix(u,v,w,alpha)*pose).move_to(pose);
            x0 = x1; y0 = y1;
          }
          if (disp.button()&2) {
            if (focale>0) Zoff-=(y0-y1)*focale/400;
            else { const float s = std::exp((y0-y1)/400.0f); pose*=s; sprite_scale*=s; }
            x0 = x1; y0 = y1;
          }
          if (disp.wheel()) {
            if (focale>0) Zoff-=disp.wheel()*focale/20;
            else { const float s = std::exp(disp.wheel()/20.0f); pose*=s; sprite_scale*=s; }
            disp.set_wheel();
          }
          if (disp.button()&4) { Xoff+=(x1-x0); Yoff+=(y1-y0); x0 = x1; y0 = y1; }
          if ((disp.button()&1) && (disp.button()&2)) {
            init_pose = true; disp.set_button(); x0 = x1; y0 = y1;
            pose = CImg<floatT>(4,3,1,1, 1,0,0,0, 0,1,0,0, 0,0,1,0);
          }
        } else if (clicked) { x0 = x1; y0 = y1; clicked = false; redraw = true; }

        switch (key = disp.key()) {
#if cimg_OS!=2
        case cimg::keyCTRLRIGHT :
#endif
        case 0 : case cimg::keyCTRLLEFT : key = 0; break;
        case cimg::keyD: if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            disp.set_fullscreen(false).resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
                                              CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false).
              _is_resized = true;
            disp.set_key(key,false); key = 0;
          } break;
        case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            disp.set_fullscreen(false).resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false)._is_resized = true;
            disp.set_key(key,false); key = 0;
          } break;
        case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            disp.set_fullscreen(false).resize(cimg_fitscreen(_width,_height,_depth),false)._is_resized = true;
            disp.set_key(key,false); key = 0;
          } break;
        case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            if (!ns_width || !ns_height ||
                ns_width>(unsigned int)disp.screen_width() || ns_height>(unsigned int)disp.screen_height()) {
              ns_width = disp.screen_width()*3U/4;
              ns_height = disp.screen_height()*3U/4;
            }
            if (disp.is_fullscreen()) disp.resize(ns_width,ns_height,false);
            else {
              ns_width = (unsigned int)disp.width(); ns_height = disp.height();
              disp.resize(disp.screen_width(),disp.screen_height(),false);
            }
            disp.toggle_fullscreen()._is_resized = true;
            disp.set_key(key,false); key = 0;
          } break;
        case cimg::keyT : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Switch single/double-sided primitives.
            if (--_double_sided==-2) _double_sided = 1;
            if (_double_sided>=0) reverse_primitives.assign();
            else primitives.get_reverse_object3d().move_to(reverse_primitives);
            disp.set_key(key,false); key = 0; redraw = true;
          } break;
        case cimg::keyZ : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Enable/disable Z-buffer
            if (zbuffer) zbuffer.assign();
            else zbuffer.assign(visu0.width(),visu0.height(),1,1,0);
            disp.set_key(key,false); key = 0; redraw = true;
          } break;
        case cimg::keyA : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Show/hide 3d axes.
            ndisplay_axes = !ndisplay_axes;
            disp.set_key(key,false); key = 0; redraw = true;
          } break;
        case cimg::keyF1 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to points.
            nrender_motion = (nrender_static==0 && nrender_motion!=0)?0:-1; nrender_static = 0;
            disp.set_key(key,false); key = 0; redraw = true;
          } break;
        case cimg::keyF2 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to lines.
            nrender_motion = (nrender_static==1 && nrender_motion!=1)?1:-1; nrender_static = 1;
            disp.set_key(key,false); key = 0; redraw = true;
          } break;
        case cimg::keyF3 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to flat.
            nrender_motion = (nrender_static==2 && nrender_motion!=2)?2:-1; nrender_static = 2;
            disp.set_key(key,false); key = 0; redraw = true;
          } break;
        case cimg::keyF4 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to flat-shaded.
            nrender_motion = (nrender_static==3 && nrender_motion!=3)?3:-1; nrender_static = 3;
            disp.set_key(key,false); key = 0; redraw = true;
          } break;
        case cimg::keyF5 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to gouraud-shaded.
            nrender_motion = (nrender_static==4 && nrender_motion!=4)?4:-1; nrender_static = 4;
            disp.set_key(key,false); key = 0; redraw = true;
          } break;
        case cimg::keyF6 : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Set rendering mode to phong-shaded.
            nrender_motion = (nrender_static==5 && nrender_motion!=5)?5:-1; nrender_static = 5;
            disp.set_key(key,false); key = 0; redraw = true;
          } break;
        case cimg::keyS : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save snapshot
            static unsigned int snap_number = 0;
            char filename[32] = { 0 };
            std::FILE *file;
            do {
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.bmp",snap_number++);
              if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
            } while (file);
            (+visu).draw_text(0,0," Saving snapshot... ",foreground_color._data,background_color._data,1,13).display(disp);
            visu.save(filename);
            visu.draw_text(0,0," Snapshot '%s' saved. ",foreground_color._data,background_color._data,1,13,filename).display(disp);
            disp.set_key(key,false); key = 0;
          } break;
        case cimg::keyG : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save object as a .off file
            static unsigned int snap_number = 0;
            char filename[32] = { 0 };
            std::FILE *file;
            do {
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.off",snap_number++);
              if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
            } while (file);
            visu.draw_text(0,0," Saving object... ",foreground_color._data,background_color._data,1,13).display(disp);
            vertices.save_off(filename,reverse_primitives?reverse_primitives:primitives,colors);
            visu.draw_text(0,0," Object '%s' saved. ",foreground_color._data,background_color._data,1,13,filename).display(disp);
            disp.set_key(key,false); key = 0;
          } break;
        case cimg::keyO : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save object as a .cimg file
            static unsigned int snap_number = 0;
            char filename[32] = { 0 };
            std::FILE *file;
            do {
#ifdef cimg_use_zlib
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.cimgz",snap_number++);
#else
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.cimg",snap_number++);
#endif
              if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
            } while (file);
            visu.draw_text(0,0," Saving object... ",foreground_color._data,background_color._data,1,13).display(disp);
            vertices.get_object3dtoCImg3d(reverse_primitives?reverse_primitives:primitives,colors,opacities).save(filename);
            visu.draw_text(0,0," Object '%s' saved. ",foreground_color._data,background_color._data,1,13,filename).display(disp);
            disp.set_key(key,false); key = 0;
          } break;
#ifdef cimg_use_board
        case cimg::keyP : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save object as a .EPS file
            static unsigned int snap_number = 0;
            char filename[32] = { 0 };
            std::FILE *file;
            do {
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.eps",snap_number++);
              if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
            } while (file);
            visu.draw_text(0,0," Saving EPS snapshot... ",foreground_color._data,background_color._data,1,13).display(disp);
            LibBoard::Board board;
            (+visu)._draw_object3d(&board,zbuffer.fill(0),
                                   Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
                                   rotated_vertices,reverse_primitives?reverse_primitives:primitives,
                                   colors,opacities,clicked?nrender_motion:nrender_static,
                                   _double_sided==1,focale,
                                   visu.width()/2.0f+light_x,visu.height()/2.0f+light_y,light_z,specular_light,specular_shine,
                                   sprite_scale);
            board.saveEPS(filename);
            visu.draw_text(0,0," Object '%s' saved. ",foreground_color._data,background_color._data,1,13,filename).display(disp);
            disp.set_key(key,false); key = 0;
          } break;
        case cimg::keyV : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) { // Save object as a .SVG file
            static unsigned int snap_number = 0;
            char filename[32] = { 0 };
            std::FILE *file;
            do {
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.svg",snap_number++);
              if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
            } while (file);
            visu.draw_text(0,0," Saving SVG snapshot... ",foreground_color._data,background_color._data,1,13).display(disp);
            LibBoard::Board board;
            (+visu)._draw_object3d(&board,zbuffer.fill(0),
                                   Xoff + visu._width/2.0f,Yoff + visu._height/2.0f,Zoff,
                                   rotated_vertices,reverse_primitives?reverse_primitives:primitives,
                                   colors,opacities,clicked?nrender_motion:nrender_static,
                                   _double_sided==1,focale,
                                   visu.width()/2.0f+light_x,visu.height()/2.0f+light_y,light_z,specular_light,specular_shine,
                                   sprite_scale);
            board.saveSVG(filename);
            visu.draw_text(0,0," Object '%s' saved. ",foreground_color._data,background_color._data,1,13,filename).display(disp);
            disp.set_key(key,false); key = 0;
          } break;
#endif
        }
        if (disp.is_resized()) {
          disp.resize(false); visu0 = get_resize(disp,1);
          if (zbuffer) zbuffer.assign(disp.width(),disp.height());
          redraw = true;
        }
      }
      if (pose_matrix) {
        std::memcpy(pose_matrix,pose._data,12*sizeof(float));
        pose_matrix[12] = Xoff; pose_matrix[13] = Yoff; pose_matrix[14] = Zoff; pose_matrix[15] = sprite_scale;
      }
      disp.set_button().set_key(key);
      return *this;
    }

    //! High-level interface for displaying a graph.
    const CImg<T>& display_graph(CImgDisplay &disp,
                                 const unsigned int plot_type=1, const unsigned int vertex_type=1,
                                 const char *const labelx=0, const double xmin=0, const double xmax=0,
                                 const char *const labely=0, const double ymin=0, const double ymax=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "display_graph() : Empty instance.",
                                    cimg_instance);
      if (!disp) disp.assign(cimg_fitscreen(640,480,1),0,0).set_title("CImg<%s>",pixel_type());
      const unsigned int siz = _width*_height*_depth, old_normalization = disp.normalization();
      disp.show().flush()._normalization = 0;

      double y0 = ymin, y1 = ymax, nxmin = xmin, nxmax = xmax;
      if (nxmin==nxmax) { nxmin = 0; nxmax = siz-1; }
      int x0 = 0, x1 = width()*height()*depth() - 1, key = 0;

      for (bool reset_view = true, resize_disp = false; !key && !disp.is_closed(); ) {
        if (reset_view) { x0 = 0; x1 = width()*height()*depth()-1; y0 = ymin; y1 = ymax; reset_view = false; }
        CImg<T> zoom(x1-x0+1,1,1,spectrum());
        cimg_forC(*this,c) zoom.get_shared_channel(c) = CImg<T>(data(x0,0,0,c),x1-x0+1,1,1,1,true);

        if (y0==y1) y0 = zoom.min_max(y1);
        if (y0==y1) { --y0; ++y1; }
        const CImg<intT> selection = zoom.get_select_graph(disp,plot_type,vertex_type,
                                                           labelx,
                                                           nxmin + x0*(nxmax-nxmin)/(siz-1),
                                                           nxmin + x1*(nxmax-nxmin)/(siz-1),
                                                           labely,y0,y1);
        const int mouse_x = disp.mouse_x(), mouse_y = disp.mouse_y();
        if (selection[0]>=0) {
          if (selection[2]<0) reset_view = true;
          else {
            x1 = x0 + selection[2]; x0+=selection[0];
            if (selection[1]>=0 && selection[3]>=0) {
              y0 = y1 - selection[3]*(y1-y0)/(disp.height()-32);
              y1-=selection[1]*(y1-y0)/(disp.height()-32);
            }
          }
        } else {
          bool go_in = false, go_out = false, go_left = false, go_right = false, go_up = false, go_down = false;
          switch (key = disp.key()) {
          case cimg::keyHOME : reset_view = resize_disp = true; key = 0; disp.set_key(); break;
          case cimg::keyPADADD : go_in = true; go_out = false; key = 0; disp.set_key(); break;
          case cimg::keyPADSUB : go_out = true; go_in = false; key = 0; disp.set_key(); break;
          case cimg::keyARROWLEFT : case cimg::keyPAD4 : go_left = true; go_right = false; key = 0; disp.set_key(); break;
          case cimg::keyARROWRIGHT : case cimg::keyPAD6 : go_right = true; go_left = false; key = 0; disp.set_key(); break;
          case cimg::keyARROWUP : case cimg::keyPAD8 : go_up = true; go_down = false; key = 0; disp.set_key(); break;
          case cimg::keyARROWDOWN : case cimg::keyPAD2 : go_down = true; go_up = false; key = 0; disp.set_key(); break;
          case cimg::keyPAD7 : go_left = true; go_up = true; key = 0; disp.set_key(); break;
          case cimg::keyPAD9 : go_right = true; go_up = true; key = 0; disp.set_key(); break;
          case cimg::keyPAD1 : go_left = true; go_down = true; key = 0; disp.set_key(); break;
          case cimg::keyPAD3 : go_right = true; go_down = true; key = 0; disp.set_key(); break;
          }
          if (disp.wheel()) {
            if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) go_out = !(go_in = disp.wheel()>0);
            else if (disp.is_keySHIFTLEFT() || disp.is_keySHIFTRIGHT()) go_left = !(go_right = disp.wheel()>0);
            else go_up = !(go_down = disp.wheel()<0);
            key = 0;
          }

          if (go_in) {
            const int
              xsiz = x1 - x0,
              mx = (mouse_x-16)*xsiz/(disp.width()-32),
              cx = x0 + (mx<0?0:(mx>=xsiz?xsiz:mx));
            if (x1-x0>4) {
              x0 = cx - 7*(cx-x0)/8; x1 = cx + 7*(x1-cx)/8;
              if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
                const double
                  ysiz = y1 - y0,
                  my = (mouse_y-16)*ysiz/(disp.height()-32),
                  cy = y1 - (my<0?0:(my>=ysiz?ysiz:my));
                y0 = cy - 7*(cy-y0)/8; y1 = cy + 7*(y1-cy)/8;
              } else y0 = y1 = 0;
            }
          }
          if (go_out) {
            if (x0>0 || x1<(int)siz-1) {
              const int deltax = (x1-x0)/8, ndeltax = deltax?deltax:(siz>1?1:0);
              const double ndeltay = (y1-y0)/8;
              x0-=ndeltax; x1+=ndeltax;
              y0-=ndeltay; y1+=ndeltay;
              if (x0<0) { x1-=x0; x0 = 0; if (x1>=(int)siz) x1 = (int)siz-1; }
              if (x1>=(int)siz) { x0-=(x1-siz+1); x1 = (int)siz-1; if (x0<0) x0 = 0; }
            }
          }
          if (go_left) {
            const int delta = (x1-x0)/5, ndelta = delta?delta:1;
            if (x0-ndelta>=0) { x0-=ndelta; x1-=ndelta; }
            else { x1-=x0; x0 = 0; }
            go_left = false;
          }
          if (go_right) {
            const int delta = (x1-x0)/5, ndelta = delta?delta:1;
            if (x1+ndelta<(int)siz) { x0+=ndelta; x1+=ndelta; }
            else { x0+=(siz-1-x1); x1 = siz-1; }
            go_right = false;
          }
          if (go_up) {
            const double delta = (y1-y0)/10, ndelta = delta?delta:1;
            y0+=ndelta; y1+=ndelta;
            go_up = false;
          }
          if (go_down) {
            const double delta = (y1-y0)/10, ndelta = delta?delta:1;
            y0-=ndelta; y1-=ndelta;
            go_down = false;
          }
        }
      }
      disp._normalization = old_normalization;
      return *this;
    }

    //! High-level interface for displaying a graph.
    const CImg<T>& display_graph(const char *const title=0,
                                 const unsigned int plot_type=1, const unsigned int vertex_type=1,
                                 const char *const labelx=0, const double xmin=0, const double xmax=0,
                                 const char *const labely=0, const double ymin=0, const double ymax=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "display_graph() : Empty instance.",
                                    cimg_instance);
      CImgDisplay disp;
      return display_graph(disp.set_title("%s",title),plot_type,vertex_type,labelx,xmin,xmax,labely,ymin,ymax);
    }

    //! Save the image as a file.
    /**
       The used file format is defined by the file extension in the filename \p filename.
       Parameter \p number can be used to add a 6-digit number to the filename before saving.
    **/
    const CImg<T>& save(const char *const filename, const int number=-1) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save() : Specified filename is (null).",
                                    cimg_instance);
      // Do not test for empty instances, since .cimg format is able to manage empty instances.
      const char *const ext = cimg::split_filename(filename);
      char nfilename[1024] = { 0 };
      const char *const fn = (number>=0)?cimg::number_filename(filename,number,6,nfilename):filename;
#ifdef cimg_save_plugin
      cimg_save_plugin(fn);
#endif
#ifdef cimg_save_plugin1
      cimg_save_plugin1(fn);
#endif
#ifdef cimg_save_plugin2
      cimg_save_plugin2(fn);
#endif
#ifdef cimg_save_plugin3
      cimg_save_plugin3(fn);
#endif
#ifdef cimg_save_plugin4
      cimg_save_plugin4(fn);
#endif
#ifdef cimg_save_plugin5
      cimg_save_plugin5(fn);
#endif
#ifdef cimg_save_plugin6
      cimg_save_plugin6(fn);
#endif
#ifdef cimg_save_plugin7
      cimg_save_plugin7(fn);
#endif
#ifdef cimg_save_plugin8
      cimg_save_plugin8(fn);
#endif
      // ASCII formats
      if (!cimg::strcasecmp(ext,"asc")) return save_ascii(fn);
      else if (!cimg::strcasecmp(ext,"dlm") ||
               !cimg::strcasecmp(ext,"txt")) return save_dlm(fn);
      else if (!cimg::strcasecmp(ext,"cpp") ||
               !cimg::strcasecmp(ext,"hpp") ||
               !cimg::strcasecmp(ext,"h") ||
               !cimg::strcasecmp(ext,"c")) return save_cpp(fn);

      // 2d binary formats
      else if (!cimg::strcasecmp(ext,"bmp")) return save_bmp(fn);
      else if (!cimg::strcasecmp(ext,"jpg") ||
               !cimg::strcasecmp(ext,"jpeg") ||
               !cimg::strcasecmp(ext,"jpe") ||
               !cimg::strcasecmp(ext,"jfif") ||
               !cimg::strcasecmp(ext,"jif")) return save_jpeg(fn);
      else if (!cimg::strcasecmp(ext,"rgb")) return save_rgb(fn);
      else if (!cimg::strcasecmp(ext,"rgba")) return save_rgba(fn);
      else if (!cimg::strcasecmp(ext,"png")) return save_png(fn);
      else if (!cimg::strcasecmp(ext,"pgm") ||
               !cimg::strcasecmp(ext,"ppm") ||
               !cimg::strcasecmp(ext,"pnm")) return save_pnm(fn);
      else if (!cimg::strcasecmp(ext,"pfm")) return save_pfm(fn);
      else if (!cimg::strcasecmp(ext,"exr")) return save_exr(fn);
      else if (!cimg::strcasecmp(ext,"tif") ||
               !cimg::strcasecmp(ext,"tiff")) return save_tiff(fn);

      // 3d binary formats
      else if (!cimg::strcasecmp(ext,"cimgz")) return save_cimg(fn,true);
      else if (!cimg::strcasecmp(ext,"cimg") || !*ext) return save_cimg(fn,false);
      else if (!cimg::strcasecmp(ext,"dcm")) return save_medcon_external(fn);
      else if (!cimg::strcasecmp(ext,"hdr") ||
               !cimg::strcasecmp(ext,"nii")) return save_analyze(fn);
      else if (!cimg::strcasecmp(ext,"inr")) return save_inr(fn);
      else if (!cimg::strcasecmp(ext,"mnc")) return save_minc2(fn);
      else if (!cimg::strcasecmp(ext,"pan")) return save_pandore(fn);
      else if (!cimg::strcasecmp(ext,"raw")) return save_raw(fn);

      // Archive files
      else if (!cimg::strcasecmp(ext,"gz")) return save_gzip_external(fn);

      // Image sequences
      else if (!cimg::strcasecmp(ext,"yuv")) return save_yuv(fn,true);
      else if (!cimg::strcasecmp(ext,"avi") ||
               !cimg::strcasecmp(ext,"mov") ||
               !cimg::strcasecmp(ext,"asf") ||
               !cimg::strcasecmp(ext,"divx") ||
               !cimg::strcasecmp(ext,"flv") ||
               !cimg::strcasecmp(ext,"mpg") ||
               !cimg::strcasecmp(ext,"m1v") ||
               !cimg::strcasecmp(ext,"m2v") ||
               !cimg::strcasecmp(ext,"m4v") ||
               !cimg::strcasecmp(ext,"mjp") ||
               !cimg::strcasecmp(ext,"mkv") ||
               !cimg::strcasecmp(ext,"mpe") ||
               !cimg::strcasecmp(ext,"movie") ||
               !cimg::strcasecmp(ext,"ogm") ||
               !cimg::strcasecmp(ext,"ogg") ||
               !cimg::strcasecmp(ext,"qt") ||
               !cimg::strcasecmp(ext,"rm") ||
               !cimg::strcasecmp(ext,"vob") ||
               !cimg::strcasecmp(ext,"wmv") ||
               !cimg::strcasecmp(ext,"xvid") ||
               !cimg::strcasecmp(ext,"mpeg")) return save_ffmpeg(fn);
      return save_other(fn);
    }

    // Save the image as an ASCII file (ASCII Raw + simple header) (internal).
    const CImg<T>& _save_ascii(std::FILE *const file, const char *const filename) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_ascii() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_ascii() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"w");
      std::fprintf(nfile,"%u %u %u %u\n",_width,_height,_depth,_spectrum);
      const T* ptrs = _data;
      cimg_forYZC(*this,y,z,c) {
        cimg_forX(*this,x) std::fprintf(nfile,"%g ",(double)*(ptrs++));
        std::fputc('\n',nfile);
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save the image as an ASCII file (ASCII Raw + simple header).
    const CImg<T>& save_ascii(const char *const filename) const {
      return _save_ascii(0,filename);
    }

    //! Save the image as an ASCII file (ASCII Raw + simple header).
    const CImg<T>& save_ascii(std::FILE *const file) const {
      return _save_ascii(file,0);
    }

    // Save the image as a C or CPP source file (internal).
    const CImg<T>& _save_cpp(std::FILE *const file, const char *const filename) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_cpp() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_cpp() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"w");
      char varname[1024] = { 0 };
      if (filename) std::sscanf(cimg::basename(filename),"%1023[a-zA-Z0-9_]",varname);
      if (!*varname) cimg_snprintf(varname,sizeof(varname),"unnamed");
      std::fprintf(nfile,
                   "/* Define image '%s' of size %ux%ux%ux%u and type '%s' */\n"
                   "%s data_%s[] = { \n  ",
                   varname,_width,_height,_depth,_spectrum,pixel_type(),pixel_type(),varname);
      for (unsigned int off = 0, siz = size()-1; off<=siz; ++off) {
        std::fprintf(nfile,cimg::type<T>::format(),cimg::type<T>::format((*this)[off]));
        if (off==siz) std::fprintf(nfile," };\n");
        else if (!((off+1)%16)) std::fprintf(nfile,",\n  ");
        else std::fprintf(nfile,", ");
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save the image as a CPP source file.
    const CImg<T>& save_cpp(const char *const filename) const {
      return _save_cpp(0,filename);
    }

    //! Save the image as a CPP source file.
    const CImg<T>& save_cpp(std::FILE *const file) const {
      return _save_cpp(file,0);
    }

    // Save the image as a DLM file (internal).
    const CImg<T>& _save_dlm(std::FILE *const file, const char *const filename) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_dlm() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_dlm() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");
      if (_depth>1)
        cimg::warn(_cimg_instance
                   "save_dlm() : Instance is volumetric, values along Z will be unrolled in file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      if (_spectrum>1)
        cimg::warn(_cimg_instance
                   "save_dlm() : Instance is multispectral, values along C will be unrolled in file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"w");
      const T* ptrs = _data;
      cimg_forYZC(*this,y,z,c) {
        cimg_forX(*this,x) std::fprintf(nfile,"%g%s",(double)*(ptrs++),(x==width()-1)?"":",");
        std::fputc('\n',nfile);
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save the image as a DLM file.
    const CImg<T>& save_dlm(const char *const filename) const {
      return _save_dlm(0,filename);
    }

    //! Save the image as a DLM file.
    const CImg<T>& save_dlm(std::FILE *const file) const {
      return _save_dlm(file,0);
    }

   // Save the image as a BMP file (internal).
    const CImg<T>& _save_bmp(std::FILE *const file, const char *const filename) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_bmp() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_bmp() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");
      if (_depth>1)
        cimg::warn(_cimg_instance
                   "save_bmp() : Instance is volumetric, only the first slice will be saved in file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      if (_spectrum>3)
        cimg::warn(_cimg_instance
                   "save_bmp() : Instance is multispectral, only the three first channels will be saved in file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      unsigned char header[54] = { 0 }, align_buf[4] = { 0 };
      const unsigned int
        align = (4 - (3*_width)%4)%4,
        buf_size = (3*_width + align)*height(),
        file_size = 54 + buf_size;
      header[0] = 'B'; header[1] = 'M';
      header[0x02] = file_size&0xFF;
      header[0x03] = (file_size>>8)&0xFF;
      header[0x04] = (file_size>>16)&0xFF;
      header[0x05] = (file_size>>24)&0xFF;
      header[0x0A] = 0x36;
      header[0x0E] = 0x28;
      header[0x12] = _width&0xFF;
      header[0x13] = (_width>>8)&0xFF;
      header[0x14] = (_width>>16)&0xFF;
      header[0x15] = (_width>>24)&0xFF;
      header[0x16] = _height&0xFF;
      header[0x17] = (_height>>8)&0xFF;
      header[0x18] = (_height>>16)&0xFF;
      header[0x19] = (_height>>24)&0xFF;
      header[0x1A] = 1;
      header[0x1B] = 0;
      header[0x1C] = 24;
      header[0x1D] = 0;
      header[0x22] = buf_size&0xFF;
      header[0x23] = (buf_size>>8)&0xFF;
      header[0x24] = (buf_size>>16)&0xFF;
      header[0x25] = (buf_size>>24)&0xFF;
      header[0x27] = 0x1;
      header[0x2B] = 0x1;
      cimg::fwrite(header,54,nfile);

      const T
        *ptr_r = data(0,_height-1,0,0),
        *ptr_g = (_spectrum>=2)?data(0,_height-1,0,1):0,
        *ptr_b = (_spectrum>=3)?data(0,_height-1,0,2):0;

      switch (_spectrum) {
      case 1 : {
        cimg_forY(*this,y) {
          cimg_forX(*this,x) {
            const unsigned char val = (unsigned char)*(ptr_r++);
            std::fputc(val,nfile); std::fputc(val,nfile); std::fputc(val,nfile);
          }
          cimg::fwrite(align_buf,align,nfile);
          ptr_r-=2*_width;
        }
      } break;
      case 2 : {
        cimg_forY(*this,y) {
          cimg_forX(*this,x) {
            std::fputc(0,nfile);
            std::fputc((unsigned char)(*(ptr_g++)),nfile);
            std::fputc((unsigned char)(*(ptr_r++)),nfile);
          }
          cimg::fwrite(align_buf,align,nfile);
          ptr_r-=2*_width; ptr_g-=2*_width;
        }
      } break;
      default : {
        cimg_forY(*this,y) {
          cimg_forX(*this,x) {
            std::fputc((unsigned char)(*(ptr_b++)),nfile);
            std::fputc((unsigned char)(*(ptr_g++)),nfile);
            std::fputc((unsigned char)(*(ptr_r++)),nfile);
          }
          cimg::fwrite(align_buf,align,nfile);
          ptr_r-=2*_width; ptr_g-=2*_width; ptr_b-=2*_width;
        }
      }
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save the image as a BMP file.
    const CImg<T>& save_bmp(const char *const filename) const {
      return _save_bmp(0,filename);
    }

    //! Save the image as a BMP file.
    const CImg<T>& save_bmp(std::FILE *const file) const {
      return _save_bmp(file,0);
    }

    // Save a file in JPEG format (internal).
    const CImg<T>& _save_jpeg(std::FILE *const file, const char *const filename, const unsigned int quality) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_jpeg() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_jpeg() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");
      if (_depth>1)
        cimg::warn(_cimg_instance
                   "save_jpeg() : Instance is volumetric, only the first slice will be saved in file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

#ifndef cimg_use_jpeg
      if (!file) return save_other(filename,quality);
      else throw CImgIOException(_cimg_instance
                                 "save_jpeg() : Unable to save data in '(*FILE)' unless libjpeg is enabled.",
                                 cimg_instance);
#else
      unsigned int dimbuf = 0;
      J_COLOR_SPACE colortype = JCS_RGB;

      switch(_spectrum) {
      case 1 : dimbuf = 1; colortype = JCS_GRAYSCALE; break;
      case 2 : dimbuf = 3; colortype = JCS_RGB; break;
      case 3 : dimbuf = 3; colortype = JCS_RGB; break;
      default: dimbuf = 4; colortype = JCS_CMYK; break;
      }

      // Call libjpeg functions
      struct jpeg_compress_struct cinfo;
      struct jpeg_error_mgr jerr;
      cinfo.err = jpeg_std_error(&jerr);
      jpeg_create_compress(&cinfo);
      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      jpeg_stdio_dest(&cinfo,nfile);
      cinfo.image_width = _width;
      cinfo.image_height = _height;
      cinfo.input_components = dimbuf;
      cinfo.in_color_space = colortype;
      jpeg_set_defaults(&cinfo);
      jpeg_set_quality(&cinfo,quality<100?quality:100,TRUE);
      jpeg_start_compress(&cinfo,TRUE);

      JSAMPROW row_pointer[1];
      CImg<ucharT> buffer(_width*dimbuf);

      while (cinfo.next_scanline < cinfo.image_height) {
        unsigned char *ptrd = buffer._data;

        // Fill pixel buffer
        switch (_spectrum) {
        case 1 : { // Greyscale images
          const T *ptr_g = data(0, cinfo.next_scanline);
          for(unsigned int b = 0; b < cinfo.image_width; b++)
            *(ptrd++) = (unsigned char)*(ptr_g++);
        } break;
        case 2 : { // RG images
          const T *ptr_r = data(0,cinfo.next_scanline,0,0),
            *ptr_g = data(0,cinfo.next_scanline,0,1);
          for(unsigned int b = 0; b < cinfo.image_width; ++b) {
            *(ptrd++) = (unsigned char)*(ptr_r++);
            *(ptrd++) = (unsigned char)*(ptr_g++);
            *(ptrd++) = 0;
          }
        } break;
        case 3 : { // RGB images
          const T *ptr_r = data(0,cinfo.next_scanline,0,0),
            *ptr_g = data(0,cinfo.next_scanline,0,1),
            *ptr_b = data(0,cinfo.next_scanline,0,2);
          for(unsigned int b = 0; b < cinfo.image_width; ++b) {
            *(ptrd++) = (unsigned char)*(ptr_r++);
            *(ptrd++) = (unsigned char)*(ptr_g++);
            *(ptrd++) = (unsigned char)*(ptr_b++);
          }
        } break;
        default : { // CMYK images
          const T *ptr_r = data(0,cinfo.next_scanline,0,0),
            *ptr_g = data(0,cinfo.next_scanline,0,1),
            *ptr_b = data(0,cinfo.next_scanline,0,2),
            *ptr_a = data(0,cinfo.next_scanline,0,3);
          for(unsigned int b = 0; b < cinfo.image_width; ++b) {
            *(ptrd++) = (unsigned char)*(ptr_r++);
            *(ptrd++) = (unsigned char)*(ptr_g++);
            *(ptrd++) = (unsigned char)*(ptr_b++);
            *(ptrd++) = (unsigned char)*(ptr_a++);
          }
        }
        }
        *row_pointer = buffer._data;
        jpeg_write_scanlines(&cinfo,row_pointer,1);
      }
      jpeg_finish_compress(&cinfo);
      if (!file) cimg::fclose(nfile);
      jpeg_destroy_compress(&cinfo);
      return *this;
#endif
    }

    //! Save a file in JPEG format.
    const CImg<T>& save_jpeg(const char *const filename, const unsigned int quality=100) const {
      return _save_jpeg(0,filename,quality);
    }

    //! Save a file in JPEG format.
    const CImg<T>& save_jpeg(std::FILE *const file, const unsigned int quality=100) const {
      return _save_jpeg(file,0,quality);
    }

    //! Save the image using built-in ImageMagick++ library.
    const CImg<T>& save_magick(const char *const filename, const unsigned int bytes_per_pixel=0) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_magick() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_magick() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);

      unsigned int foo = bytes_per_pixel; foo = 0;
#ifdef cimg_use_magick
      double stmin, stmax = (double)max_min(stmin);
      if (_depth>1)
        cimg::warn(_cimg_instance
                   "save_magick() : Instance is volumetric, only the first slice will be saved in file '%s'.",
                   cimg_instance,
                   filename);

      if (_spectrum>3)
        cimg::warn(_cimg_instance
                   "save_magick() : Instance is multispectral, only the three first channels will be saved in file '%s'.",
                   cimg_instance,
                   filename);

      if (stmin<0 || (bytes_per_pixel==1 && stmax>=256) || stmax>=65536)
        cimg::warn(_cimg_instance
                   "save_magick() : Instance has pixel values in [%g,%g], probable type overflow in file '%s'.",
                   cimg_instance,
                   filename,stmin,stmax);

      Magick::Image image(Magick::Geometry(_width,_height),"black");
      image.type(Magick::TrueColorType);
      image.depth(bytes_per_pixel?(8*bytes_per_pixel):(stmax>=256?16:8));
      const T
        *ptr_r = data(0,0,0,0),
        *ptr_g = _spectrum>1?data(0,0,0,1):0,
        *ptr_b = _spectrum>2?data(0,0,0,2):0;
      Magick::PixelPacket *pixels = image.getPixels(0,0,_width,_height);
      switch (_spectrum) {
      case 1 : // Scalar images
        for (unsigned int off = _width*_height; off; --off) {
          pixels->red = pixels->green = pixels->blue = (Magick::Quantum)*(ptr_r++);
          ++pixels;
        }
        break;
      case 2 : // RG images
        for (unsigned int off = _width*_height; off; --off) {
          pixels->red = (Magick::Quantum)*(ptr_r++);
          pixels->green = (Magick::Quantum)*(ptr_g++);
          pixels->blue = 0; ++pixels;
        }
        break;
      default : // RGB images
        for (unsigned int off = _width*_height; off; --off) {
          pixels->red = (Magick::Quantum)*(ptr_r++);
          pixels->green = (Magick::Quantum)*(ptr_g++);
          pixels->blue = (Magick::Quantum)*(ptr_b++);
          ++pixels;
        }
      }
      image.syncPixels();
      image.write(filename);
#else
      throw CImgIOException(_cimg_instance
                            "save_magick() : Unable to save file '%s' unless libMagick++ is enabled.",
                            cimg_instance,
                            filename);
#endif
      return *this;
    }

    // Save an image to a PNG file (internal).
    // Most of this function has been written by Eric Fausett
    const CImg<T>& _save_png(std::FILE *const file, const char *const filename, const unsigned int bytes_per_pixel=0) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_png() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_png() : Empty image, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");

      unsigned int foo = bytes_per_pixel; foo = 0;
#ifndef cimg_use_png
      if (!file) return save_other(filename);
      else throw CImgIOException(_cimg_instance
                                 "save_png() : Unable to save data in '(*FILE)' unless libpng is enabled.",
                                 cimg_instance);
#else
      const char *volatile nfilename = filename; // two 'volatile' here to remove a g++ warning due to 'setjmp'.
      std::FILE *volatile nfile = file?file:cimg::fopen(nfilename,"wb");

      double stmin, stmax = (double)max_min(stmin);
      if (_depth>1)
        cimg::warn(_cimg_instance
                   "save_png() : Instance is volumetric, only the first slice will be saved in file '%s'.",
                   cimg_instance,
                   filename);

      if (_spectrum>4)
        cimg::warn(_cimg_instance
                   "save_png() : Instance is multispectral, only the three first channels will be saved in file '%s'.",
                   cimg_instance,
                   filename);

      if (stmin<0 || (bytes_per_pixel==1 && stmax>=256) || stmax>=65536)
        cimg::warn(_cimg_instance
                   "save_png() : Instance has pixel values in [%g,%g], probable type overflow in file '%s'.",
                   cimg_instance,
                   filename,stmin,stmax);

      // Setup PNG structures for write
      png_voidp user_error_ptr = 0;
      png_error_ptr user_error_fn = 0, user_warning_fn = 0;
      png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,user_error_ptr, user_error_fn, user_warning_fn);
      if(!png_ptr){
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "save_png() : Failed to initialize 'png_ptr' structure when saving file '%s'.",
                              cimg_instance,
                              nfilename?nfilename:"(FILE*)");
      }
      png_infop info_ptr = png_create_info_struct(png_ptr);
      if (!info_ptr) {
        png_destroy_write_struct(&png_ptr,(png_infopp)0);
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "save_png() : Failed to initialize 'info_ptr' structure when saving file '%s'.",
                              cimg_instance,
                              nfilename?nfilename:"(FILE*)");
      }
      if (setjmp(png_jmpbuf(png_ptr))) {
        png_destroy_write_struct(&png_ptr, &info_ptr);
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "save_png() : Encountered unknown fatal error in libpng when saving file '%s'.",
                              cimg_instance,
                              nfilename?nfilename:"(FILE*)");
      }
      png_init_io(png_ptr, nfile);
      const int bit_depth = bytes_per_pixel?(bytes_per_pixel*8):(stmax>=256?16:8);
      int color_type;
      switch (spectrum()) {
      case 1 : color_type = PNG_COLOR_TYPE_GRAY; break;
      case 2 : color_type = PNG_COLOR_TYPE_GRAY_ALPHA; break;
      case 3 : color_type = PNG_COLOR_TYPE_RGB; break;
      default : color_type = PNG_COLOR_TYPE_RGB_ALPHA;
      }
      const int interlace_type = PNG_INTERLACE_NONE;
      const int compression_type = PNG_COMPRESSION_TYPE_DEFAULT;
      const int filter_method = PNG_FILTER_TYPE_DEFAULT;
      png_set_IHDR(png_ptr,info_ptr,_width,_height,bit_depth,color_type,interlace_type,compression_type,filter_method);
      png_write_info(png_ptr,info_ptr);
      const int byte_depth = bit_depth>>3;
      const int numChan = spectrum()>4?4:spectrum();
      const int pixel_bit_depth_flag = numChan * (bit_depth-1);

      // Allocate Memory for Image Save and Fill pixel data
      png_bytep *const imgData = new png_byte*[_height];
      for (unsigned int row = 0; row<_height; ++row) imgData[row] = new png_byte[byte_depth*numChan*_width];
      const T *pC0 = data(0,0,0,0);
      switch (pixel_bit_depth_flag) {
      case 7 :  { // Gray 8-bit
        cimg_forY(*this,y) {
          unsigned char *ptrd = imgData[y];
          cimg_forX(*this,x) *(ptrd++) = (unsigned char)*(pC0++);
        }
      } break;
      case 14 : { // Gray w/ Alpha 8-bit
        const T *pC1 = data(0,0,0,1);
        cimg_forY(*this,y) {
          unsigned char *ptrd = imgData[y];
          cimg_forX(*this,x) {
            *(ptrd++) = (unsigned char)*(pC0++);
            *(ptrd++) = (unsigned char)*(pC1++);
          }
        }
      } break;
      case 21 :  { // RGB 8-bit
        const T *pC1 = data(0,0,0,1), *pC2 = data(0,0,0,2);
        cimg_forY(*this,y) {
          unsigned char *ptrd = imgData[y];
          cimg_forX(*this,x) {
            *(ptrd++) = (unsigned char)*(pC0++);
            *(ptrd++) = (unsigned char)*(pC1++);
            *(ptrd++) = (unsigned char)*(pC2++);
          }
        }
      } break;
      case 28 : { // RGB x/ Alpha 8-bit
        const T *pC1 = data(0,0,0,1), *pC2 = data(0,0,0,2), *pC3 = data(0,0,0,3);
        cimg_forY(*this,y){
          unsigned char *ptrd = imgData[y];
          cimg_forX(*this,x){
            *(ptrd++) = (unsigned char)*(pC0++);
            *(ptrd++) = (unsigned char)*(pC1++);
            *(ptrd++) = (unsigned char)*(pC2++);
            *(ptrd++) = (unsigned char)*(pC3++);
          }
        }
      } break;
      case 15 : { // Gray 16-bit
        cimg_forY(*this,y){
          unsigned short *ptrd = (unsigned short*)(imgData[y]);
          cimg_forX(*this,x) *(ptrd++) = (unsigned short)*(pC0++);
          if (!cimg::endianness()) cimg::invert_endianness((unsigned short*)imgData[y],_width);
        }
      } break;
      case 30 : { // Gray w/ Alpha 16-bit
        const T *pC1 = data(0,0,0,1);
        cimg_forY(*this,y){
          unsigned short *ptrd = (unsigned short*)(imgData[y]);
          cimg_forX(*this,x) {
            *(ptrd++) = (unsigned short)*(pC0++);
            *(ptrd++) = (unsigned short)*(pC1++);
          }
          if (!cimg::endianness()) cimg::invert_endianness((unsigned short*)imgData[y],2*_width);
        }
      } break;
      case 45 : { // RGB 16-bit
        const T *pC1 = data(0,0,0,1), *pC2 = data(0,0,0,2);
        cimg_forY(*this,y) {
          unsigned short *ptrd = (unsigned short*)(imgData[y]);
          cimg_forX(*this,x) {
            *(ptrd++) = (unsigned short)*(pC0++);
            *(ptrd++) = (unsigned short)*(pC1++);
            *(ptrd++) = (unsigned short)*(pC2++);
          }
          if (!cimg::endianness()) cimg::invert_endianness((unsigned short*)imgData[y],3*_width);
        }
      } break;
      case 60 : { // RGB w/ Alpha 16-bit
        const T *pC1 = data(0,0,0,1), *pC2 = data(0,0,0,2), *pC3 = data(0,0,0,3);
        cimg_forY(*this,y) {
          unsigned short *ptrd = (unsigned short*)(imgData[y]);
          cimg_forX(*this,x) {
            *(ptrd++) = (unsigned short)*(pC0++);
            *(ptrd++) = (unsigned short)*(pC1++);
            *(ptrd++) = (unsigned short)*(pC2++);
            *(ptrd++) = (unsigned short)*(pC3++);
          }
          if (!cimg::endianness()) cimg::invert_endianness((unsigned short*)imgData[y],4*_width);
        }
      } break;
      default :
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimg_instance
                              "save_png() : Encountered unknown fatal error in libpng when saving file '%s'.",
                              cimg_instance,
                              nfilename?nfilename:"(FILE*)");
      }
      png_write_image(png_ptr,imgData);
      png_write_end(png_ptr,info_ptr);
      png_destroy_write_struct(&png_ptr, &info_ptr);

      // Deallocate Image Write Memory
      cimg_forY(*this,n) delete[] imgData[n];
      delete[] imgData;
      if (!file) cimg::fclose(nfile);
      return *this;
#endif
    }

    //! Save a file in PNG format
    const CImg<T>& save_png(const char *const filename, const unsigned int bytes_per_pixel=0) const {
      return _save_png(0,filename,bytes_per_pixel);
    }

    //! Save a file in PNG format
    const CImg<T>& save_png(std::FILE *const file, const unsigned int bytes_per_pixel=0) const {
      return _save_png(file,0,bytes_per_pixel);
    }

    //! Save the image as a PNM file.
    const CImg<T>& save_pnm(const char *const filename, const unsigned int bytes_per_pixel=0) const {
      return _save_pnm(0,filename,bytes_per_pixel);
    }

    //! Save the image as a PNM file.
    const CImg<T>& save_pnm(std::FILE *const file, const unsigned int bytes_per_pixel=0) const {
      return _save_pnm(file,0,bytes_per_pixel);
    }

    // Save the image as a PNM file (internal function).
    const CImg<T>& _save_pnm(std::FILE *const file, const char *const filename, const unsigned int bytes_per_pixel=0) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_pnm() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_pnm() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");

      double stmin, stmax = (double)max_min(stmin);
      if (_depth>1)
        cimg::warn(_cimg_instance
                   "save_pnm() : Instance is volumetric, only the first slice will be saved in file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      if (_spectrum>3)
        cimg::warn(_cimg_instance
                   "save_pnm() : Instance is multispectral, only the three first channels will be saved in file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      if (stmin<0 || (bytes_per_pixel==1 && stmax>=256) || stmax>=65536)
        cimg::warn(_cimg_instance
                   "save_pnm() : Instance has pixel values in [%g,%g], probable type overflow in file '%s'.",
                   cimg_instance,
                   stmin,stmax,filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      const T
        *ptr_r = data(0,0,0,0),
        *ptr_g = (_spectrum>=2)?data(0,0,0,1):0,
        *ptr_b = (_spectrum>=3)?data(0,0,0,2):0;
      const unsigned int buf_size = cimg::min(1024*1024U,_width*_height*(_spectrum==1?1:3));

      std::fprintf(nfile,"P%c\n%u %u\n%u\n",
                   (_spectrum==1?'5':'6'),_width,_height,stmax<256?255:(stmax<4096?4095:65535));

      switch (_spectrum) {
      case 1 : { // Scalar image
        if (bytes_per_pixel==1 || (!bytes_per_pixel && stmax<256)) { // Binary PGM 8 bits
          CImg<ucharT> buf(buf_size);
          for (int to_write = _width*_height; to_write>0; ) {
            const unsigned int N = cimg::min((unsigned int)to_write,buf_size);
            unsigned char *ptrd = buf._data;
            for (int i = (int)N; i>0; --i) *(ptrd++) = (unsigned char)*(ptr_r++);
            cimg::fwrite(buf._data,N,nfile);
            to_write-=N;
          }
        } else {             // Binary PGM 16 bits
          CImg<ushortT> buf(buf_size);
          for (int to_write = _width*_height; to_write>0; ) {
            const unsigned int N = cimg::min((unsigned int)to_write,buf_size);
            unsigned short *ptrd = buf._data;
            for (int i = (int)N; i>0; --i) *(ptrd++) = (unsigned short)*(ptr_r++);
            if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
            cimg::fwrite(buf._data,N,nfile);
            to_write-=N;
          }
        }
      } break;
      case 2 : { // RG image
        if (bytes_per_pixel==1 || (!bytes_per_pixel && stmax<256)) { // Binary PPM 8 bits
          CImg<ucharT> buf(buf_size);
          for (int to_write = _width*_height; to_write>0; ) {
            const unsigned int N = cimg::min((unsigned int)to_write,buf_size/3);
            unsigned char *ptrd = buf._data;
            for (int i = (int)N; i>0; --i) {
              *(ptrd++) = (unsigned char)*(ptr_r++);
              *(ptrd++) = (unsigned char)*(ptr_g++);
              *(ptrd++) = 0;
            }
            cimg::fwrite(buf._data,3*N,nfile);
            to_write-=N;
          }
        } else {             // Binary PPM 16 bits
          CImg<ushortT> buf(buf_size);
          for (int to_write = _width*_height; to_write>0; ) {
            const unsigned int N = cimg::min((unsigned int)to_write,buf_size/3);
            unsigned short *ptrd = buf._data;
            for (int i = (int)N; i>0; --i) {
              *(ptrd++) = (unsigned short)*(ptr_r++);
              *(ptrd++) = (unsigned short)*(ptr_g++);
              *(ptrd++) = 0;
            }
            if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
            cimg::fwrite(buf._data,3*N,nfile);
            to_write-=N;
          }
        }
      } break;
      default : { // RGB image
        if (bytes_per_pixel==1 || (!bytes_per_pixel && stmax<256)) { // Binary PPM 8 bits
          CImg<ucharT> buf(buf_size);
          for (int to_write = _width*_height; to_write>0; ) {
            const unsigned int N = cimg::min((unsigned int)to_write,buf_size/3);
            unsigned char *ptrd = buf._data;
            for (int i = (int)N; i>0; --i) {
              *(ptrd++) = (unsigned char)*(ptr_r++);
              *(ptrd++) = (unsigned char)*(ptr_g++);
              *(ptrd++) = (unsigned char)*(ptr_b++);
            }
            cimg::fwrite(buf._data,3*N,nfile);
            to_write-=N;
          }
        } else {             // Binary PPM 16 bits
          CImg<ushortT> buf(buf_size);
          for (int to_write = _width*_height; to_write>0; ) {
            const unsigned int N = cimg::min((unsigned int)to_write,buf_size/3);
            unsigned short *ptrd = buf._data;
            for (int i = (int)N; i>0; --i) {
              *(ptrd++) = (unsigned short)*(ptr_r++);
              *(ptrd++) = (unsigned short)*(ptr_g++);
              *(ptrd++) = (unsigned short)*(ptr_b++);
            }
            if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
            cimg::fwrite(buf._data,3*N,nfile);
            to_write-=N;
          }
        }
      }
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save the image as a PFM file.
    const CImg<T>& save_pfm(const char *const filename) const {
      return _save_pfm(0,filename);
    }

    //! Save the image as a PFM file.
    const CImg<T>& save_pfm(std::FILE *const file) const {
      return _save_pfm(file,0);
    }

    // Save the image as a PFM file (internal function).
    const CImg<T>& _save_pfm(std::FILE *const file, const char *const filename) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_pfm() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_pfm() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");
      if (_depth>1)
        cimg::warn(_cimg_instance
                   "save_pfm() : Instance is volumetric, only the first slice will be saved in file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      if (_spectrum>3)
        cimg::warn(_cimg_instance
                   "save_pfm() : Instance image is multispectral, only the three first channels will be saved in file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      const T
        *ptr_r = data(0,0,0,0),
        *ptr_g = (_spectrum>=2)?data(0,0,0,1):0,
        *ptr_b = (_spectrum>=3)?data(0,0,0,2):0;
      const unsigned int buf_size = cimg::min(1024*1024U,_width*_height*(_spectrum==1?1:3));

      std::fprintf(nfile,"P%c\n%u %u\n1.0\n",
                   (_spectrum==1?'f':'F'),_width,_height);

      switch (_spectrum) {
      case 1 : { // Scalar image
        CImg<floatT> buf(buf_size);
        for (int to_write = _width*_height; to_write>0; ) {
          const unsigned int N = cimg::min((unsigned int)to_write,buf_size);
          float *ptrd = buf._data;
          for (int i = (int)N; i>0; --i) *(ptrd++) = (float)*(ptr_r++);
          if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
          cimg::fwrite(buf._data,N,nfile);
          to_write-=N;
        }
      } break;
      case 2 : { // RG image
        CImg<floatT> buf(buf_size);
        for (int to_write = _width*_height; to_write>0; ) {
          const unsigned int N = cimg::min((unsigned int)to_write,buf_size/3);
          float *ptrd = buf._data;
          for (int i = (int)N; i>0; --i) {
            *(ptrd++) = (float)*(ptr_r++);
            *(ptrd++) = (float)*(ptr_g++);
            *(ptrd++) = 0;
          }
          if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
          cimg::fwrite(buf._data,3*N,nfile);
          to_write-=N;
        }
      } break;
      default : { // RGB image
        CImg<floatT> buf(buf_size);
        for (int to_write = _width*_height; to_write>0; ) {
          const unsigned int N = cimg::min((unsigned int)to_write,buf_size/3);
          float *ptrd = buf._data;
          for (int i = (int)N; i>0; --i) {
            *(ptrd++) = (float)*(ptr_r++);
            *(ptrd++) = (float)*(ptr_g++);
            *(ptrd++) = (float)*(ptr_b++);
          }
          if (!cimg::endianness()) cimg::invert_endianness(buf._data,buf_size);
          cimg::fwrite(buf._data,3*N,nfile);
          to_write-=N;
        }
      }
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    // Save the image as a RGB file (internal).
    const CImg<T>& _save_rgb(std::FILE *const file, const char *const filename) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_rgb() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_rgb() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");
      if (_spectrum!=3)
        cimg::warn(_cimg_instance
                   "save_rgb() : Instance image has not exactly 3 channels, for file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      const unsigned int wh = _width*_height;
      unsigned char *const buffer = new unsigned char[3*wh], *nbuffer = buffer;
      const T
        *ptr1 = data(0,0,0,0),
        *ptr2 = _spectrum>1?data(0,0,0,1):0,
        *ptr3 = _spectrum>2?data(0,0,0,2):0;
      switch (_spectrum) {
      case 1 : { // Scalar image
        for (unsigned int k = 0; k<wh; ++k) {
          const unsigned char val = (unsigned char)*(ptr1++);
          *(nbuffer++) = val;
          *(nbuffer++) = val;
          *(nbuffer++) = val;
        }
      } break;
      case 2 : { // RG image
        for (unsigned int k = 0; k<wh; ++k) {
          *(nbuffer++) = (unsigned char)(*(ptr1++));
          *(nbuffer++) = (unsigned char)(*(ptr2++));
          *(nbuffer++) = 0;
        }
      } break;
      default : { // RGB image
        for (unsigned int k = 0; k<wh; ++k) {
          *(nbuffer++) = (unsigned char)(*(ptr1++));
          *(nbuffer++) = (unsigned char)(*(ptr2++));
          *(nbuffer++) = (unsigned char)(*(ptr3++));
        }
      }
      }
      cimg::fwrite(buffer,3*wh,nfile);
      if (!file) cimg::fclose(nfile);
      delete[] buffer;
      return *this;
    }

    //! Save the image as a RGB file.
    const CImg<T>& save_rgb(const char *const filename) const {
      return _save_rgb(0,filename);
    }

    //! Save the image as a RGB file.
    const CImg<T>& save_rgb(std::FILE *const file) const {
      return _save_rgb(file,0);
    }

    // Save the image as a RGBA file (internal).
    const CImg<T>& _save_rgba(std::FILE *const file, const char *const filename) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_rgba() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_rgba() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");
      if (_spectrum!=4)
        cimg::warn(_cimg_instance
                   "save_rgba() : Instance image has not exactly 4 channels, for file '%s'.",
                   cimg_instance,
                   filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      const unsigned int wh = _width*_height;
      unsigned char *const buffer = new unsigned char[4*wh], *nbuffer = buffer;
      const T
        *ptr1 = data(0,0,0,0),
        *ptr2 = _spectrum>1?data(0,0,0,1):0,
        *ptr3 = _spectrum>2?data(0,0,0,2):0,
        *ptr4 = _spectrum>3?data(0,0,0,3):0;
      switch (_spectrum) {
      case 1 : { // Scalar images
        for (unsigned int k = 0; k<wh; ++k) {
          const unsigned char val = (unsigned char)*(ptr1++);
          *(nbuffer++) = val;
          *(nbuffer++) = val;
          *(nbuffer++) = val;
          *(nbuffer++) = 255;
        }
      } break;
      case 2 : { // RG images
        for (unsigned int k = 0; k<wh; ++k) {
          *(nbuffer++) = (unsigned char)(*(ptr1++));
          *(nbuffer++) = (unsigned char)(*(ptr2++));
          *(nbuffer++) = 0;
          *(nbuffer++) = 255;
        }
      } break;
      case 3 : { // RGB images
        for (unsigned int k = 0; k<wh; ++k) {
          *(nbuffer++) = (unsigned char)(*(ptr1++));
          *(nbuffer++) = (unsigned char)(*(ptr2++));
          *(nbuffer++) = (unsigned char)(*(ptr3++));
          *(nbuffer++) = 255;
        }
      } break;
      default : { // RGBA images
        for (unsigned int k = 0; k<wh; ++k) {
          *(nbuffer++) = (unsigned char)(*(ptr1++));
          *(nbuffer++) = (unsigned char)(*(ptr2++));
          *(nbuffer++) = (unsigned char)(*(ptr3++));
          *(nbuffer++) = (unsigned char)(*(ptr4++));
        }
      }
      }
      cimg::fwrite(buffer,4*wh,nfile);
      if (!file) cimg::fclose(nfile);
      delete[] buffer;
      return *this;
    }

    //! Save the image as a RGBA file.
    const CImg<T>& save_rgba(const char *const filename) const {
      return _save_rgba(0,filename);
    }

    //! Save the image as a RGBA file.
    const CImg<T>& save_rgba(std::FILE *const file) const {
      return _save_rgba(file,0);
    }

    // Save a plane into a tiff file
#ifdef cimg_use_tiff

#define _cimg_save_tiff(types,typed,compression) \
    if (!std::strcmp(types,pixel_type())) { const typed foo = (typed)0; return _save_tiff(tif,directory,foo,compression); }

    template<typename t>
    const CImg<T>& _save_tiff(TIFF *tif, const unsigned int directory, const t& pixel_t, const unsigned int compression) const {
      if (is_empty() || !tif || pixel_t) return *this;
      const char *const filename = TIFFFileName(tif);
      uint32 rowsperstrip = (uint32)-1;
      uint16 spp = _spectrum, bpp = sizeof(t)*8, photometric;
      if (spp==3 || spp==4) photometric = PHOTOMETRIC_RGB;
      else photometric = PHOTOMETRIC_MINISBLACK;
      TIFFSetDirectory(tif,directory);
      TIFFSetField(tif,TIFFTAG_IMAGEWIDTH,_width);
      TIFFSetField(tif,TIFFTAG_IMAGELENGTH,_height);
      TIFFSetField(tif,TIFFTAG_ORIENTATION,ORIENTATION_TOPLEFT);
      TIFFSetField(tif,TIFFTAG_SAMPLESPERPIXEL,spp);
      if (cimg::type<t>::is_float()) TIFFSetField(tif,TIFFTAG_SAMPLEFORMAT,3);
      else if (cimg::type<t>::min()==0) TIFFSetField(tif,TIFFTAG_SAMPLEFORMAT,1);
      else TIFFSetField(tif,TIFFTAG_SAMPLEFORMAT,2);
      TIFFSetField(tif,TIFFTAG_BITSPERSAMPLE,bpp);
      TIFFSetField(tif,TIFFTAG_PLANARCONFIG,PLANARCONFIG_CONTIG);
      TIFFSetField(tif,TIFFTAG_PHOTOMETRIC,photometric);
      TIFFSetField(tif,TIFFTAG_COMPRESSION,compression?(compression-1):COMPRESSION_NONE);
      rowsperstrip = TIFFDefaultStripSize(tif,rowsperstrip);
      TIFFSetField(tif,TIFFTAG_ROWSPERSTRIP,rowsperstrip);
      TIFFSetField(tif,TIFFTAG_FILLORDER,FILLORDER_MSB2LSB);
      TIFFSetField(tif,TIFFTAG_SOFTWARE,"CImg");
      t *const buf = (t*)_TIFFmalloc(TIFFStripSize(tif));
      if (buf) {
        for (unsigned int row = 0; row<_height; row+=rowsperstrip) {
          uint32 nrow = (row + rowsperstrip>_height?_height-row:rowsperstrip);
          tstrip_t strip = TIFFComputeStrip(tif,row,0);
          tsize_t i = 0;
          for (unsigned int rr = 0; rr<nrow; ++rr)
            for (unsigned int cc = 0; cc<_width; ++cc)
              for (unsigned int vv = 0; vv<spp; ++vv)
                buf[i++] = (t)(*this)(cc,row + rr,0,vv);
          if (TIFFWriteEncodedStrip(tif,strip,buf,i*sizeof(t))<0)
            throw CImgException(_cimg_instance
                                "save_tiff() : Invalid strip writting when saving file '%s'.",
                                cimg_instance,
                                filename?filename:"(FILE*)");
        }
        _TIFFfree(buf);
      }
      TIFFWriteDirectory(tif);
      return (*this);
    }

    const CImg<T>& _save_tiff(TIFF *tif, const unsigned int directory, const unsigned int compression) const {
      _cimg_save_tiff("bool",unsigned char,compression);
      _cimg_save_tiff("char",char,compression);
      _cimg_save_tiff("unsigned char",unsigned char,compression);
      _cimg_save_tiff("short",short,compression);
      _cimg_save_tiff("unsigned short",unsigned short,compression);
      _cimg_save_tiff("int",int,compression);
      _cimg_save_tiff("unsigned int",unsigned int,compression);
      _cimg_save_tiff("long",int,compression);
      _cimg_save_tiff("unsigned long",unsigned int,compression);
      _cimg_save_tiff("float",float,compression);
      _cimg_save_tiff("double",float,compression);
      const char *const filename = TIFFFileName(tif);
      throw CImgException(_cimg_instance
                          "save_tiff() : Unsupported pixel type '%s' for file '%s'.",
                          cimg_instance,
                          pixel_type(),filename?filename:"(FILE*)");
      return *this;
    }
#endif

    //! Save a file in TIFF format.
    /**
       - libtiff support is enabled by defining the precompilation
        directive cimg_use_tif.

       - When libtiff is enabled, 2D and 3D (multipage) several
        channel per pixel are supported for
        char,uchar,short,ushort,float and double pixel type.

       - If cimg_use_tif is not defined at compilation time the
        function uses CImg<T>&save_other(const char*).

       \param compression 1:None, 2:CCITTRLE, 3:CCITTFAX3, 4:CCITTFAX4, 5:LZW, 6:JPEG

       \see CImg<T>& save_other(const char*)
       \see CImg<T>& load_tiff(const char*)
     **/
    const CImg<T>& save_tiff(const char *const filename, const unsigned int compression=0) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_tiff() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_tiff() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);

#ifdef cimg_use_tiff
      TIFF *tif = TIFFOpen(filename,"w");
      if (tif) {
        cimg_forZ(*this,z) get_slice(z)._save_tiff(tif,z,compression);
        TIFFClose(tif);
      } else throw CImgException(_cimg_instance
                                 "save_tiff() : Failed to open file '%s' for writing.",
                                 cimg_instance,
                                 filename);
#else
      cimg::unused(compression);
      return save_other(filename);
#endif
      return *this;
    }

    //! Save the image as a MINC2 file.
    // (Original code by Haz-Edine Assemlal).
    const CImg<T>& save_minc2(const char *const filename) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_minc2() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_minc2() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);
#ifndef cimg_use_minc2
      return save_other(filename);
#else
      int nb_useful_dims = 0;
      if (width()!=1) ++nb_useful_dims;
      if (height()!=1) ++nb_useful_dims;
      if (depth()!=1) ++nb_useful_dims;
      if (spectrum()!=1) ++nb_useful_dims;

      int result;
      mihandle_t hvol;
      midimhandle_t *const hdims = (midimhandle_t*)std::malloc(nb_useful_dims*sizeof(midimhandle_t));
      CImg<ulongT>
        start(nb_useful_dims,1,1,1,0),
        count(nb_useful_dims,1,1,1,0);
      CImg<floatT> output(*this);
      const char* dim_name[] = {"xspace", "yspace", "zspace", "time"};
      const midimclass_t dim_class[] = { MI_DIMCLASS_SPATIAL,MI_DIMCLASS_SPATIAL,MI_DIMCLASS_SPATIAL,MI_DIMCLASS_TIME };
      const midimattr_t dim_attr = MI_DIMATTR_REGULARLY_SAMPLED;

      // Strange stuffs here
      /* The conversion from CImg data to Minc works only for
       * specific orders (increasing dimensions and data in decreasing)
       */
      CImg<charT> permutations, permutations_inv;
      CImg<uintT>
        dim_vec = CImg<uintT>::vector(width(),height(),depth(),spectrum()),
        dim_sort = dim_vec.get_sort(permutations,true);
      dim_vec.get_sort(permutations_inv,false);

      int d = 0;
      cimg_foroff(dim_sort,dv) {
        if (dim_sort(dv)<=1) continue;
        result = micreate_dimension(dim_name[(int)permutations(dv)],dim_class[(int)permutations(dv)],
                                    dim_attr,dim_sort(dv),&hdims[d]);
        count(d++) = dim_sort(dv);
      }
      cimg_for(permutations_inv,ptr,char) if (*ptr<3) (*ptr)+='x'; else *ptr='c';
      output.permute_axes(permutations_inv.append(CImg<uintT>::vector(0),'y').data()).mirror('y');

      // End of strange stuffs.

      result = micreate_volume(filename,nb_useful_dims,hdims,MI_TYPE_FLOAT,MI_CLASS_REAL,0,&hvol);
      result = micreate_volume_image(hvol);
      result = miset_volume_range(hvol,max(),min());
      result = miset_voxel_value_hyperslab(hvol,MI_TYPE_FLOAT,start,count,output.data());
      result = miclose_volume(hvol);
      result = mifree_dimension_handle(*hdims);
      return *this;
#endif
    }

    //! Save the image as an ANALYZE7.5 or NIFTI file.
    const CImg<T>& save_analyze(const char *const filename, const float *const voxsize=0) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_analyze() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_analyze() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);

      std::FILE *file;
      char header[348] = { 0 }, hname[1024] = { 0 }, iname[1024] = { 0 };
      const char *const ext = cimg::split_filename(filename);
      short datatype=-1;
      std::memset(header,0,348);
      if (!*ext) { cimg_snprintf(hname,sizeof(hname),"%s.hdr",filename); cimg_snprintf(iname,sizeof(iname),"%s.img",filename); }
      if (!cimg::strncasecmp(ext,"hdr",3)) {
        std::strcpy(hname,filename); std::strncpy(iname,filename,sizeof(iname)-1); std::sprintf(iname + std::strlen(iname)-3,"img");
      }
      if (!cimg::strncasecmp(ext,"img",3)) {
        std::strcpy(hname,filename); std::strncpy(iname,filename,sizeof(iname)-1); std::sprintf(hname + std::strlen(iname)-3,"hdr");
      }
      if (!cimg::strncasecmp(ext,"nii",3)) {
        std::strncpy(hname,filename,sizeof(hname)-1); *iname = 0;
      }
      int *const iheader = (int*)header;
      *iheader = 348;
      std::strcpy(header + 4,"CImg");
      std::strcpy(header + 14," ");
      ((short*)(header + 36))[0] = 4096;
      ((char*)(header + 38))[0] = 114;
      ((short*)(header + 40))[0] = 4;
      ((short*)(header + 40))[1] = _width;
      ((short*)(header + 40))[2] = _height;
      ((short*)(header + 40))[3] = _depth;
      ((short*)(header + 40))[4] = _spectrum;
      if (!cimg::strcasecmp(pixel_type(),"bool")) datatype = 2;
      if (!cimg::strcasecmp(pixel_type(),"unsigned char")) datatype = 2;
      if (!cimg::strcasecmp(pixel_type(),"char")) datatype = 2;
      if (!cimg::strcasecmp(pixel_type(),"unsigned short")) datatype = 4;
      if (!cimg::strcasecmp(pixel_type(),"short")) datatype = 4;
      if (!cimg::strcasecmp(pixel_type(),"unsigned int")) datatype = 8;
      if (!cimg::strcasecmp(pixel_type(),"int")) datatype = 8;
      if (!cimg::strcasecmp(pixel_type(),"unsigned long")) datatype = 8;
      if (!cimg::strcasecmp(pixel_type(),"long")) datatype = 8;
      if (!cimg::strcasecmp(pixel_type(),"float")) datatype = 16;
      if (!cimg::strcasecmp(pixel_type(),"double")) datatype = 64;
      if (datatype<0)
        throw CImgIOException(_cimg_instance
                              "save_analyze() : Unsupported pixel type '%s' for file '%s'.",
                              cimg_instance,
                              pixel_type(),filename);

      ((short*)(header+70))[0] = datatype;
      ((short*)(header+72))[0] = sizeof(T);
      ((float*)(header+112))[0] = 1;
      ((float*)(header+76))[0] = 0;
      if (voxsize) {
        ((float*)(header+76))[1] = voxsize[0];
        ((float*)(header+76))[2] = voxsize[1];
        ((float*)(header+76))[3] = voxsize[2];
      } else ((float*)(header+76))[1] = ((float*)(header+76))[2] = ((float*)(header+76))[3] = 1;
      file = cimg::fopen(hname,"wb");
      cimg::fwrite(header,348,file);
      if (*iname) { cimg::fclose(file); file = cimg::fopen(iname,"wb"); }
      cimg::fwrite(_data,size(),file);
      cimg::fclose(file);
      return *this;
    }

    //! Save the image as a .cimg file.
    const CImg<T>& save_cimg(const char *const filename, const bool compression=false) const {
      CImgList<T>(*this,true).save_cimg(filename,compression);
      return *this;
    }

    // Save the image as a .cimg file.
    const CImg<T>& save_cimg(std::FILE *const file, const bool compression=false) const {
      CImgList<T>(*this,true).save_cimg(file,compression);
      return *this;
    }

    //! Insert the image into an existing .cimg file, at specified coordinates.
    const CImg<T>& save_cimg(const char *const filename,
                             const unsigned int n0,
                             const unsigned int x0, const unsigned int y0,
                             const unsigned int z0, const unsigned int c0) const {
      CImgList<T>(*this,true).save_cimg(filename,n0,x0,y0,z0,c0);
      return *this;
    }

    //! Insert the image into an existing .cimg file, at specified coordinates.
    const CImg<T>& save_cimg(std::FILE *const file,
                             const unsigned int n0,
                             const unsigned int x0, const unsigned int y0,
                             const unsigned int z0, const unsigned int c0) const {
      CImgList<T>(*this,true).save_cimg(file,n0,x0,y0,z0,c0);
      return *this;
    }

    //! Save an empty .cimg file with specified dimensions.
    static void save_empty_cimg(const char *const filename,
                                const unsigned int dx, const unsigned int dy=1,
                                const unsigned int dz=1, const unsigned int dc=1) {
      return CImgList<T>::save_empty_cimg(filename,1,dx,dy,dz,dc);
    }

    //! Save an empty .cimg file with specified dimensions.
    static void save_empty_cimg(std::FILE *const file,
                                const unsigned int dx, const unsigned int dy=1,
                                const unsigned int dz=1, const unsigned int dc=1) {
      return CImgList<T>::save_empty_cimg(file,1,dx,dy,dz,dc);
    }

    // Save the image as an INRIMAGE-4 file (internal).
    const CImg<T>& _save_inr(std::FILE *const file, const char *const filename, const float *const voxsize) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_inr() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_inr() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");

      int inrpixsize=-1;
      const char *inrtype = "unsigned fixed\nPIXSIZE=8 bits\nSCALE=2**0";
      if (!cimg::strcasecmp(pixel_type(),"unsigned char"))  { inrtype = "unsigned fixed\nPIXSIZE=8 bits\nSCALE=2**0"; inrpixsize = 1; }
      if (!cimg::strcasecmp(pixel_type(),"char"))           { inrtype = "fixed\nPIXSIZE=8 bits\nSCALE=2**0"; inrpixsize = 1; }
      if (!cimg::strcasecmp(pixel_type(),"unsigned short")) { inrtype = "unsigned fixed\nPIXSIZE=16 bits\nSCALE=2**0";inrpixsize = 2; }
      if (!cimg::strcasecmp(pixel_type(),"short"))          { inrtype = "fixed\nPIXSIZE=16 bits\nSCALE=2**0"; inrpixsize = 2; }
      if (!cimg::strcasecmp(pixel_type(),"unsigned int"))   { inrtype = "unsigned fixed\nPIXSIZE=32 bits\nSCALE=2**0";inrpixsize = 4; }
      if (!cimg::strcasecmp(pixel_type(),"int"))            { inrtype = "fixed\nPIXSIZE=32 bits\nSCALE=2**0"; inrpixsize = 4; }
      if (!cimg::strcasecmp(pixel_type(),"float"))          { inrtype = "float\nPIXSIZE=32 bits"; inrpixsize = 4; }
      if (!cimg::strcasecmp(pixel_type(),"double"))         { inrtype = "float\nPIXSIZE=64 bits"; inrpixsize = 8; }
      if (inrpixsize<=0)
        throw CImgIOException(_cimg_instance
                              "save_inr() : Unsupported pixel type '%s' for file '%s'",
                              cimg_instance,
                              pixel_type(),filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      char header[257] = { 0 };
      int err = cimg_snprintf(header,sizeof(header),"#INRIMAGE-4#{\nXDIM=%u\nYDIM=%u\nZDIM=%u\nVDIM=%u\n",_width,_height,_depth,_spectrum);
      if (voxsize) err+=std::sprintf(header + err,"VX=%g\nVY=%g\nVZ=%g\n",voxsize[0],voxsize[1],voxsize[2]);
      err+=std::sprintf(header + err,"TYPE=%s\nCPU=%s\n",inrtype,cimg::endianness()?"sun":"decm");
      std::memset(header + err,'\n',252 - err);
      std::memcpy(header + 252,"##}\n",4);
      cimg::fwrite(header,256,nfile);
      cimg_forXYZ(*this,x,y,z) cimg_forC(*this,c) cimg::fwrite(&((*this)(x,y,z,c)),1,nfile);
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save the image as an INRIMAGE-4 file.
    const CImg<T>& save_inr(const char *const filename, const float *const voxsize=0) const {
      return _save_inr(0,filename,voxsize);
    }

    //! Save the image as an INRIMAGE-4 file.
    const CImg<T>& save_inr(std::FILE *const file, const float *const voxsize=0) const {
      return _save_inr(file,0,voxsize);
    }

    //! Save the image as a EXR file.
    const CImg<T>& save_exr(const char *const filename) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_exr() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_exr() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);
      if (_depth>1)
        cimg::warn(_cimg_instance
                   "save_exr() : Instance is volumetric, only the first slice will be saved in file '%s'.",
                   cimg_instance,
                   filename);

#ifndef cimg_use_openexr
      return save_other(filename);
#else
      Imf::Rgba *const ptrd0 = new Imf::Rgba[_width*_height], *ptrd = ptrd0, rgba;
      switch (_spectrum) {
      case 1 : { // Grayscale image.
        for (const T *ptr_r = data(), *const ptr_e = ptr_r + _width*_height; ptr_r<ptr_e;) {
          rgba.r = rgba.g = rgba.b = (half)(*(ptr_r++));
          rgba.a = (half)1;
          *(ptrd++) = rgba;
        }
      } break;
      case 2 : { // RG image.
        for (const T *ptr_r = data(), *ptr_g = data(0,0,0,1), *const ptr_e = ptr_r + _width*_height; ptr_r<ptr_e; ) {
          rgba.r = (half)(*(ptr_r++));
          rgba.g = (half)(*(ptr_g++));
          rgba.b = (half)0;
          rgba.a = (half)1;
          *(ptrd++) = rgba;
        }
      } break;
      case 3 : { // RGB image.
        for (const T *ptr_r = data(), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2), *const ptr_e = ptr_r + _width*_height; ptr_r<ptr_e;) {
          rgba.r = (half)(*(ptr_r++));
          rgba.g = (half)(*(ptr_g++));
          rgba.b = (half)(*(ptr_b++));
          rgba.a = (half)1;
          *(ptrd++) = rgba;
        }
      } break;
      default : { // RGBA image.
        for (const T *ptr_r = data(), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2), *ptr_a = data(0,0,0,3),
               *const ptr_e = ptr_r + _width*_height; ptr_r<ptr_e;) {
          rgba.r = (half)(*(ptr_r++));
          rgba.g = (half)(*(ptr_g++));
          rgba.b = (half)(*(ptr_b++));
          rgba.a = (half)(*(ptr_a++));
          *(ptrd++) = rgba;
        }
      } break;
      }
      Imf::RgbaOutputFile outFile(filename,_width,_height,
                                  _spectrum==1?Imf::WRITE_Y:_spectrum==2?Imf::WRITE_YA:_spectrum==3?Imf::WRITE_RGB:Imf::WRITE_RGBA);
      outFile.setFrameBuffer(ptrd0,1,_width);
      outFile.writePixels(_height);
      delete[] ptrd0;
      return *this;
#endif
    }

    // Save the image as a PANDORE-5 file (internal).
    unsigned int _save_pandore_header_length(unsigned int id, unsigned int *dims, const unsigned int colorspace) const {
      unsigned int nbdims = 0;
      if (id==2 || id==3 || id==4) { dims[0] = 1; dims[1] = _width;  nbdims = 2; }
      if (id==5 || id==6 || id==7) { dims[0] = 1; dims[1] = _height; dims[2] = _width;  nbdims=3; }
      if (id==8 || id==9 || id==10) { dims[0] = _spectrum; dims[1] = _depth;  dims[2] = _height; dims[3] = _width; nbdims = 4; }
      if (id==16 || id==17 || id==18) { dims[0] = 3; dims[1] = _height; dims[2] = _width;  dims[3] = colorspace; nbdims = 4; }
      if (id==19 || id==20 || id==21) { dims[0] = 3; dims[1] = _depth;  dims[2] = _height; dims[3] = _width; dims[4] = colorspace; nbdims = 5; }
      if (id==22 || id==23 || id==25) { dims[0] = _spectrum; dims[1] = _width;  nbdims = 2; }
      if (id==26 || id==27 || id==29) { dims[0] = _spectrum; dims[1] = _height; dims[2] = _width;  nbdims=3; }
      if (id==30 || id==31 || id==33) { dims[0] = _spectrum; dims[1] = _depth;  dims[2] = _height; dims[3] = _width; nbdims = 4; }
      return nbdims;
    }

    const CImg<T>& _save_pandore(std::FILE *const file, const char *const filename, const unsigned int colorspace) const {

#define __cimg_save_pandore_case(dtype) \
       dtype *buffer = new dtype[size()]; \
       const T *ptrs = _data; \
       cimg_foroff(*this,off) *(buffer++) = (dtype)(*(ptrs++)); \
       buffer-=size(); \
       cimg::fwrite(buffer,size(),nfile); \
       delete[] buffer

#define _cimg_save_pandore_case(sy,sz,sv,stype,id) \
      if (!saved && (sy?(sy==_height):true) && (sz?(sz==_depth):true) && (sv?(sv==_spectrum):true) && !std::strcmp(stype,pixel_type())) { \
        unsigned int *iheader = (unsigned int*)(header+12); \
        nbdims = _save_pandore_header_length((*iheader=id),dims,colorspace); \
        cimg::fwrite(header,36,nfile); \
        if (sizeof(unsigned long)==4) { unsigned long ndims[5] = { 0 }; for (int d = 0; d<5; ++d) ndims[d] = (unsigned long)dims[d]; cimg::fwrite(ndims,nbdims,nfile); } \
        else if (sizeof(unsigned int)==4) { unsigned int ndims[5] = { 0 }; for (int d = 0; d<5; ++d) ndims[d] = (unsigned int)dims[d]; cimg::fwrite(ndims,nbdims,nfile); } \
        else if (sizeof(unsigned short)==4) { unsigned short ndims[5] = { 0 }; for (int d = 0; d<5; ++d) ndims[d] = (unsigned short)dims[d]; cimg::fwrite(ndims,nbdims,nfile); } \
        else throw CImgIOException(_cimg_instance \
                                   "save_pandore() : Unsupported datatype for file '%s'.",\
                                   cimg_instance, \
                                   filename?filename:"(FILE*)"); \
        if (id==2 || id==5 || id==8 || id==16 || id==19 || id==22 || id==26 || id==30) { \
          __cimg_save_pandore_case(unsigned char); \
        } else if (id==3 || id==6 || id==9 || id==17 || id==20 || id==23 || id==27 || id==31) { \
          if (sizeof(unsigned long)==4) { __cimg_save_pandore_case(unsigned long); } \
          else if (sizeof(unsigned int)==4) { __cimg_save_pandore_case(unsigned int); } \
          else if (sizeof(unsigned short)==4) { __cimg_save_pandore_case(unsigned short); } \
          else throw CImgIOException(_cimg_instance \
                                     "save_pandore() : Unsupported datatype for file '%s'.",\
                                     cimg_instance, \
                                     filename?filename:"(FILE*)"); \
        } else if (id==4 || id==7 || id==10 || id==18 || id==21 || id==25 || id==29 || id==33) { \
          if (sizeof(double)==4) { __cimg_save_pandore_case(double); } \
          else if (sizeof(float)==4) { __cimg_save_pandore_case(float); } \
          else throw CImgIOException(_cimg_instance \
                                     "save_pandore() : Unsupported datatype for file '%s'.",\
                                     cimg_instance, \
                                     filename?filename:"(FILE*)"); \
        } \
        saved = true; \
      }

      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_pandore() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_pandore() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      unsigned char header[36] = { 'P','A','N','D','O','R','E','0','4',0,0,0,
                                   0,0,0,0,'C','I','m','g',0,0,0,0,0,'N','o',' ','d','a','t','e',0,0,0,0 };
      unsigned int nbdims, dims[5] = { 0 };
      bool saved = false;
      _cimg_save_pandore_case(1,1,1,"unsigned char",2);
      _cimg_save_pandore_case(1,1,1,"char",3);
      _cimg_save_pandore_case(1,1,1,"short",3);
      _cimg_save_pandore_case(1,1,1,"unsigned short",3);
      _cimg_save_pandore_case(1,1,1,"unsigned int",3);
      _cimg_save_pandore_case(1,1,1,"int",3);
      _cimg_save_pandore_case(1,1,1,"unsigned long",4);
      _cimg_save_pandore_case(1,1,1,"long",3);
      _cimg_save_pandore_case(1,1,1,"float",4);
      _cimg_save_pandore_case(1,1,1,"double",4);

      _cimg_save_pandore_case(0,1,1,"unsigned char",5);
      _cimg_save_pandore_case(0,1,1,"char",6);
      _cimg_save_pandore_case(0,1,1,"short",6);
      _cimg_save_pandore_case(0,1,1,"unsigned short",6);
      _cimg_save_pandore_case(0,1,1,"unsigned int",6);
      _cimg_save_pandore_case(0,1,1,"int",6);
      _cimg_save_pandore_case(0,1,1,"unsigned long",7);
      _cimg_save_pandore_case(0,1,1,"long",6);
      _cimg_save_pandore_case(0,1,1,"float",7);
      _cimg_save_pandore_case(0,1,1,"double",7);

      _cimg_save_pandore_case(0,0,1,"unsigned char",8);
      _cimg_save_pandore_case(0,0,1,"char",9);
      _cimg_save_pandore_case(0,0,1,"short",9);
      _cimg_save_pandore_case(0,0,1,"unsigned short",9);
      _cimg_save_pandore_case(0,0,1,"unsigned int",9);
      _cimg_save_pandore_case(0,0,1,"int",9);
      _cimg_save_pandore_case(0,0,1,"unsigned long",10);
      _cimg_save_pandore_case(0,0,1,"long",9);
      _cimg_save_pandore_case(0,0,1,"float",10);
      _cimg_save_pandore_case(0,0,1,"double",10);

      _cimg_save_pandore_case(0,1,3,"unsigned char",16);
      _cimg_save_pandore_case(0,1,3,"char",17);
      _cimg_save_pandore_case(0,1,3,"short",17);
      _cimg_save_pandore_case(0,1,3,"unsigned short",17);
      _cimg_save_pandore_case(0,1,3,"unsigned int",17);
      _cimg_save_pandore_case(0,1,3,"int",17);
      _cimg_save_pandore_case(0,1,3,"unsigned long",18);
      _cimg_save_pandore_case(0,1,3,"long",17);
      _cimg_save_pandore_case(0,1,3,"float",18);
      _cimg_save_pandore_case(0,1,3,"double",18);

      _cimg_save_pandore_case(0,0,3,"unsigned char",19);
      _cimg_save_pandore_case(0,0,3,"char",20);
      _cimg_save_pandore_case(0,0,3,"short",20);
      _cimg_save_pandore_case(0,0,3,"unsigned short",20);
      _cimg_save_pandore_case(0,0,3,"unsigned int",20);
      _cimg_save_pandore_case(0,0,3,"int",20);
      _cimg_save_pandore_case(0,0,3,"unsigned long",21);
      _cimg_save_pandore_case(0,0,3,"long",20);
      _cimg_save_pandore_case(0,0,3,"float",21);
      _cimg_save_pandore_case(0,0,3,"double",21);

      _cimg_save_pandore_case(1,1,0,"unsigned char",22);
      _cimg_save_pandore_case(1,1,0,"char",23);
      _cimg_save_pandore_case(1,1,0,"short",23);
      _cimg_save_pandore_case(1,1,0,"unsigned short",23);
      _cimg_save_pandore_case(1,1,0,"unsigned int",23);
      _cimg_save_pandore_case(1,1,0,"int",23);
      _cimg_save_pandore_case(1,1,0,"unsigned long",25);
      _cimg_save_pandore_case(1,1,0,"long",23);
      _cimg_save_pandore_case(1,1,0,"float",25);
      _cimg_save_pandore_case(1,1,0,"double",25);

      _cimg_save_pandore_case(0,1,0,"unsigned char",26);
      _cimg_save_pandore_case(0,1,0,"char",27);
      _cimg_save_pandore_case(0,1,0,"short",27);
      _cimg_save_pandore_case(0,1,0,"unsigned short",27);
      _cimg_save_pandore_case(0,1,0,"unsigned int",27);
      _cimg_save_pandore_case(0,1,0,"int",27);
      _cimg_save_pandore_case(0,1,0,"unsigned long",29);
      _cimg_save_pandore_case(0,1,0,"long",27);
      _cimg_save_pandore_case(0,1,0,"float",29);
      _cimg_save_pandore_case(0,1,0,"double",29);

      _cimg_save_pandore_case(0,0,0,"unsigned char",30);
      _cimg_save_pandore_case(0,0,0,"char",31);
      _cimg_save_pandore_case(0,0,0,"short",31);
      _cimg_save_pandore_case(0,0,0,"unsigned short",31);
      _cimg_save_pandore_case(0,0,0,"unsigned int",31);
      _cimg_save_pandore_case(0,0,0,"int",31);
      _cimg_save_pandore_case(0,0,0,"unsigned long",33);
      _cimg_save_pandore_case(0,0,0,"long",31);
      _cimg_save_pandore_case(0,0,0,"float",33);
      _cimg_save_pandore_case(0,0,0,"double",33);

      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save the image as a PANDORE-5 file.
    const CImg<T>& save_pandore(const char *const filename, const unsigned int colorspace=0) const {
      return _save_pandore(0,filename,colorspace);
    }

    //! Save the image as a PANDORE-5 file.
    const CImg<T>& save_pandore(std::FILE *const file, const unsigned int colorspace=0) const {
      return _save_pandore(file,0,colorspace);
    }

   // Save the image as a RAW file (internal).
    const CImg<T>& _save_raw(std::FILE *const file, const char *const filename, const bool multiplexed) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_raw() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_raw() : empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      if (!multiplexed) cimg::fwrite(_data,size(),nfile);
      else {
        CImg<T> buf(_spectrum);
        cimg_forXYZ(*this,x,y,z) {
          cimg_forC(*this,c) buf[c] = (*this)(x,y,z,c);
          cimg::fwrite(buf._data,_spectrum,nfile);
        }
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save the image as a RAW file.
    const CImg<T>& save_raw(const char *const filename, const bool multiplexed=false) const {
      return _save_raw(0,filename,multiplexed);
    }

    //! Save the image as a RAW file.
    const CImg<T>& save_raw(std::FILE *const file, const bool multiplexed=false) const {
      return _save_raw(file,0,multiplexed);
    }

    //! Save the image as a video sequence file, using FFMPEG library.
    const CImg<T>& save_ffmpeg(const char *const filename, const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                               const unsigned int fps=25, const unsigned int bitrate=2048) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_ffmpeg() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_ffmpeg() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);
      if (!fps)
        throw CImgArgumentException(_cimg_instance
                                    "save_ffmpeg() : Invalid specified framerate 0, for file '%s'.",
                                    cimg_instance,
                                    filename);

#ifndef cimg_use_ffmpeg
      return save_ffmpeg_external(filename,first_frame,last_frame,"mpeg2video",fps,bitrate);
#else
      get_split('z').save_ffmpeg(filename,first_frame,last_frame,fps,bitrate);
#endif
      return *this;
    }

    //! Save the image as a YUV video sequence file.
    const CImg<T>& save_yuv(const char *const filename, const bool rgb2yuv=true) const {
      get_split('z').save_yuv(filename,rgb2yuv);
      return *this;
    }

    //! Save the image as a YUV video sequence file.
    const CImg<T>& save_yuv(std::FILE *const file, const bool rgb2yuv=true) const {
      get_split('z').save_yuv(file,rgb2yuv);
      return *this;
    }

    // Save OFF files (internal).
    template<typename tf, typename tc>
    const CImg<T>& _save_off(std::FILE *const file, const char *const filename,
                             const CImgList<tf>& primitives, const CImgList<tc>& colors) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_off() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_off() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename?filename:"(FILE*)");

      CImgList<T> opacities;
      char error_message[1024] = { 0 };
      if (!is_object3d(primitives,colors,opacities,true,error_message))
        throw CImgInstanceException(_cimg_instance
                                    "save_off() : Invalid specified 3d object, for file '%s' (%s).",
                                    cimg_instance,
                                    filename?filename:"(FILE*)",error_message);

      const CImg<tc> default_color(1,3,1,1,200);
      std::FILE *const nfile = file?file:cimg::fopen(filename,"w");
      unsigned int supported_primitives = 0;
      cimglist_for(primitives,l) if (primitives[l].size()!=5) ++supported_primitives;
      std::fprintf(nfile,"OFF\n%u %u %u\n",_width,supported_primitives,3*primitives._width);
      cimg_forX(*this,i) std::fprintf(nfile,"%f %f %f\n",(float)((*this)(i,0)),(float)((*this)(i,1)),(float)((*this)(i,2)));
      cimglist_for(primitives,l) {
        const CImg<tc>& color = l<colors.width()?colors[l]:default_color;
        const unsigned int psiz = primitives[l].size(), csiz = color.size();
        const float r = color[0]/255.0f, g = (csiz>1?color[1]:r)/255.0f, b = (csiz>2?color[2]:g)/255.0f;
        switch (psiz) {
        case 1 : std::fprintf(nfile,"1 %u %f %f %f\n",(unsigned int)primitives(l,0),r,g,b); break;
        case 2 : std::fprintf(nfile,"2 %u %u %f %f %f\n",(unsigned int)primitives(l,0),(unsigned int)primitives(l,1),r,g,b); break;
        case 3 : std::fprintf(nfile,"3 %u %u %u %f %f %f\n",(unsigned int)primitives(l,0),(unsigned int)primitives(l,2),
                              (unsigned int)primitives(l,1),r,g,b); break;
        case 4 : std::fprintf(nfile,"4 %u %u %u %u %f %f %f\n",(unsigned int)primitives(l,0),(unsigned int)primitives(l,3),
                              (unsigned int)primitives(l,2),(unsigned int)primitives(l,1),r,g,b); break;
        case 5 : std::fprintf(nfile,"2 %u %u %f %f %f\n",(unsigned int)primitives(l,0),(unsigned int)primitives(l,1),r,g,b); break;
        case 6 : {
          const unsigned int xt = (unsigned int)primitives(l,2), yt = (unsigned int)primitives(l,3);
          const float rt = color.atXY(xt,yt,0)/255.0f, gt = (csiz>1?color.atXY(xt,yt,1):r)/255.0f, bt = (csiz>2?color.atXY(xt,yt,2):g)/255.0f;
          std::fprintf(nfile,"2 %u %u %f %f %f\n",(unsigned int)primitives(l,0),(unsigned int)primitives(l,1),rt,gt,bt);
        } break;
        case 9 : {
          const unsigned int xt = (unsigned int)primitives(l,3), yt = (unsigned int)primitives(l,4);
          const float rt = color.atXY(xt,yt,0)/255.0f, gt = (csiz>1?color.atXY(xt,yt,1):r)/255.0f, bt = (csiz>2?color.atXY(xt,yt,2):g)/255.0f;
          std::fprintf(nfile,"3 %u %u %u %f %f %f\n",(unsigned int)primitives(l,0),(unsigned int)primitives(l,2),
                       (unsigned int)primitives(l,1),rt,gt,bt);
        } break;
        case 12 : {
          const unsigned int xt = (unsigned int)primitives(l,4), yt = (unsigned int)primitives(l,5);
          const float rt = color.atXY(xt,yt,0)/255.0f, gt = (csiz>1?color.atXY(xt,yt,1):r)/255.0f, bt = (csiz>2?color.atXY(xt,yt,2):g)/255.0f;
          std::fprintf(nfile,"4 %u %u %u %u %f %f %f\n",(unsigned int)primitives(l,0),(unsigned int)primitives(l,3),
                       (unsigned int)primitives(l,2),(unsigned int)primitives(l,1),rt,gt,bt);
        } break;
        }
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save OFF files.
    template<typename tf, typename tc>
    const CImg<T>& save_off(const char *const filename,
                            const CImgList<tf>& primitives, const CImgList<tc>& colors) const {
      return _save_off(0,filename,primitives,colors);
    }

    //! Save OFF files.
    template<typename tf, typename tc>
    const CImg<T>& save_off(std::FILE *const file,
                            const CImgList<tf>& primitives, const CImgList<tc>& colors) const {
      return _save_off(file,0,primitives,colors);
    }

    //! Save the image as a video sequence file, using the external tool 'ffmpeg'.
    const CImg<T>& save_ffmpeg_external(const char *const filename, const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                        const char *const codec="mpeg2video", const unsigned int fps=25, const unsigned int bitrate=2048) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_ffmpeg_external() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_ffmpeg_external() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);

      get_split('z').save_ffmpeg_external(filename,first_frame,last_frame,codec,fps,bitrate);
      return *this;
    }

    //! Save the image using GraphicsMagick's gm.
    /** Function that saves the image for other file formats that are not natively handled by CImg,
        using the tool 'gm' from the GraphicsMagick package.\n
        This is the case for all compressed image formats (GIF,PNG,JPG,TIF, ...). You need to install
        the GraphicsMagick package in order to get
        this function working properly (see http://www.graphicsmagick.org ).
    **/
    const CImg<T>& save_graphicsmagick_external(const char *const filename, const unsigned int quality=100) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_graphicsmagick_external() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_graphicsmagick_external() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);

      char command[1024] = { 0 }, filetmp[512] = { 0 };
      std::FILE *file;
      do {
        cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),_spectrum==1?"pgm":"ppm");
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);
      save_pnm(filetmp);
      cimg_snprintf(command,sizeof(command),"%s -quality %u%% \"%s\" \"%s\"",cimg::graphicsmagick_path(),quality,filetmp,filename);
      cimg::system(command);
      file = std::fopen(filename,"rb");
      if (!file)
        throw CImgIOException(_cimg_instance
                              "save_graphicsmagick_external() : Failed to save file '%s' with external command 'gm'.",
                              cimg_instance,
                              filename);

      if (file) cimg::fclose(file);
      std::remove(filetmp);
      return *this;
    }

    //! Save an image as a gzipped file, using external tool 'gzip'.
    const CImg<T>& save_gzip_external(const char *const filename) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_gzip_external() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_gzip_external() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);

      char command[1024] = { 0 }, filetmp[512] = { 0 }, body[512] = { 0 };
      const char
        *ext = cimg::split_filename(filename,body),
        *ext2 = cimg::split_filename(body,0);
      std::FILE *file;
      do {
        if (!cimg::strcasecmp(ext,"gz")) {
          if (*ext2) cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext2);
          else cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.cimg",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        } else {
          if (*ext) cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext);
          else cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.cimg",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        }
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);
      save(filetmp);
      cimg_snprintf(command,sizeof(command),"%s -c %s > \"%s\"",cimg::gzip_path(),filetmp,filename);
      cimg::system(command);
      file = std::fopen(filename,"rb");
      if (!file)
        throw CImgIOException(_cimg_instance
                              "save_gzip_external() : Failed to save file '%s' with external command 'gzip'.",
                              cimg_instance,
                              filename);

      else cimg::fclose(file);
      std::remove(filetmp);
      return *this;
    }

    //! Save the image using ImageMagick's convert.
    /** Function that saves the image for other file formats that are not natively handled by CImg,
        using the tool 'convert' from the ImageMagick package.\n
        This is the case for all compressed image formats (GIF,PNG,JPG,TIF, ...). You need to install
        the ImageMagick package in order to get
        this function working properly (see http://www.imagemagick.org ).
    **/
    const CImg<T>& save_imagemagick_external(const char *const filename, const unsigned int quality=100) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_imagemagick_external() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_imagemagick_external() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);

      char command[1024] = { 0 }, filetmp[512] = { 0 };
      std::FILE *file;
      do {
        cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),_spectrum==1?"pgm":"ppm");
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);
      save_pnm(filetmp);
      cimg_snprintf(command,sizeof(command),"%s -quality %u%% \"%s\" \"%s\"",cimg::imagemagick_path(),quality,filetmp,filename);
      cimg::system(command);
      file = std::fopen(filename,"rb");
      if (!file)
        throw CImgIOException(_cimg_instance
                              "save_imagemagick_external() : Failed to save file '%s' with external command 'convert'.",
                              cimg_instance,
                              filename);

      if (file) cimg::fclose(file);
      std::remove(filetmp);
      return *this;
    }

    //! Save an image as a Dicom file (need '(X)Medcon' : http://xmedcon.sourceforge.net )
    const CImg<T>& save_medcon_external(const char *const filename) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_medcon_external() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_medcon_external() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);

      char command[1024] = { 0 }, filetmp[512] = { 0 }, body[512] = { 0 };
      std::FILE *file;
      do {
        cimg_snprintf(filetmp,sizeof(filetmp),"%s.hdr",cimg::filenamerand());
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);
      save_analyze(filetmp);
      cimg_snprintf(command,sizeof(command),"%s -w -c dicom -o %s -f %s",cimg::medcon_path(),filename,filetmp);
      cimg::system(command);
      std::remove(filetmp);
      cimg::split_filename(filetmp,body);
      cimg_snprintf(filetmp,sizeof(filetmp),"%s.img",body);
      std::remove(filetmp);

      file = std::fopen(filename,"rb");
      if (!file) {
        cimg_snprintf(command,sizeof(command),"m000-%s",filename);
        file = std::fopen(command,"rb");
        if (!file) {
          cimg::fclose(cimg::fopen(filename,"r"));
          throw CImgIOException(_cimg_instance
                                "save_medcon_external() : Failed to save file '%s' with external command 'medcon'.",
                                cimg_instance,
                                filename);
        }
      }
      cimg::fclose(file);
      std::rename(command,filename);
      return *this;
    }

    // Try to save the image if other extension is provided.
    const CImg<T>& save_other(const char *const filename, const unsigned int quality=100) const {
      if (!filename)
        throw CImgArgumentException(_cimg_instance
                                    "save_other() : Specified filename is (null).",
                                    cimg_instance);
      if (is_empty())
        throw CImgInstanceException(_cimg_instance
                                    "save_other() : Empty instance, for file '%s'.",
                                    cimg_instance,
                                    filename);

      const unsigned int omode = cimg::exception_mode();
      bool is_saved = true;
      cimg::exception_mode() = 0;
      try { save_magick(filename); }
      catch (CImgException&) {
        try { save_imagemagick_external(filename,quality); }
        catch (CImgException&) {
          try { save_graphicsmagick_external(filename,quality); }
          catch (CImgException&) {
            is_saved = false;
          }
        }
      }
      cimg::exception_mode() = omode;
      if (!is_saved)
        throw CImgIOException(_cimg_instance
                              "save_other() : Failed to save file '%s'. Format is not natively supported, and no external commands succeeded.",
                              cimg_instance,
                              filename);
      return *this;
    }

    // Get a 40x38 color logo of a 'danger' item (internal).
    static CImg<T> logo40x38() {
      static bool first_time = true;
      static CImg<T> res(40,38,1,3);
      if (first_time) {
        const unsigned char *ptrs = cimg::logo40x38;
        T *ptr1 = res.data(0,0,0,0), *ptr2 = res.data(0,0,0,1), *ptr3 = res.data(0,0,0,2);
        for (unsigned int off = 0; off<res._width*res._height;) {
          const unsigned char n = *(ptrs++), r = *(ptrs++), g = *(ptrs++), b = *(ptrs++);
          for (unsigned int l = 0; l<n; ++off, ++l) { *(ptr1++) = (T)r; *(ptr2++) = (T)g; *(ptr3++) = (T)b; }
        }
        first_time = false;
      }
      return res;
    }

    //@}
  };

  /*
   #-----------------------------------------
   #
   #
   #
   # Definition of the CImgList<T> structure
   #
   #
   #
   #------------------------------------------
   */

  //! Class representing list of images CImg<T>.
  template<typename T>
  struct CImgList {

    //! Size of the list (number of images).
    unsigned int _width;

    //! Allocation size of the list.
    unsigned int _allocated_width;

    //! Pointer to the first list element.
    CImg<T> *_data;

    //! Define a CImgList<T>::iterator.
    typedef CImg<T>* iterator;

    //! Define a CImgList<T>::const_iterator.
    typedef const CImg<T>* const_iterator;

    //! Value type.
    typedef T value_type;

    // Define common T-dependant types.
    typedef typename cimg::superset<T,bool>::type Tbool;
    typedef typename cimg::superset<T,unsigned char>::type Tuchar;
    typedef typename cimg::superset<T,char>::type Tchar;
    typedef typename cimg::superset<T,unsigned short>::type Tushort;
    typedef typename cimg::superset<T,short>::type Tshort;
    typedef typename cimg::superset<T,unsigned int>::type Tuint;
    typedef typename cimg::superset<T,int>::type Tint;
    typedef typename cimg::superset<T,unsigned long>::type Tulong;
    typedef typename cimg::superset<T,long>::type Tlong;
    typedef typename cimg::superset<T,float>::type Tfloat;
    typedef typename cimg::superset<T,double>::type Tdouble;
    typedef typename cimg::last<T,bool>::type boolT;
    typedef typename cimg::last<T,unsigned char>::type ucharT;
    typedef typename cimg::last<T,char>::type charT;
    typedef typename cimg::last<T,unsigned short>::type ushortT;
    typedef typename cimg::last<T,short>::type shortT;
    typedef typename cimg::last<T,unsigned int>::type uintT;
    typedef typename cimg::last<T,int>::type intT;
    typedef typename cimg::last<T,unsigned long>::type ulongT;
    typedef typename cimg::last<T,long>::type longT;
    typedef typename cimg::last<T,float>::type floatT;
    typedef typename cimg::last<T,double>::type doubleT;

    //@}
    //---------------------------
    //
    //! \name Plugins
    //@{
    //---------------------------
#ifdef cimglist_plugin
#include cimglist_plugin
#endif
#ifdef cimglist_plugin1
#include cimglist_plugin1
#endif
#ifdef cimglist_plugin2
#include cimglist_plugin2
#endif
#ifdef cimglist_plugin3
#include cimglist_plugin3
#endif
#ifdef cimglist_plugin4
#include cimglist_plugin4
#endif
#ifdef cimglist_plugin5
#include cimglist_plugin5
#endif
#ifdef cimglist_plugin6
#include cimglist_plugin6
#endif
#ifdef cimglist_plugin7
#include cimglist_plugin7
#endif
#ifdef cimglist_plugin8
#include cimglist_plugin8
#endif

    //@}
    //--------------------------------------------------------
    //
    //! \name Constructors / Destructor / Instance Management
    //@{
    //--------------------------------------------------------

    //! Destructor.
    ~CImgList() {
      delete[] _data;
    }

    //! Default constructor.
    CImgList():
      _width(0),_allocated_width(0),_data(0) {}

    //! Construct an image list containing n empty images.
    explicit CImgList(const unsigned int n):_width(n) {
      if (n) _data = new CImg<T>[_allocated_width = cimg::max(16UL,cimg::nearest_pow2(n))];
      else { _allocated_width = 0; _data = 0; }
    }

    //! Construct an image list containing n images with specified size.
    CImgList(const unsigned int n, const unsigned int width, const unsigned int height=1,
             const unsigned int depth=1, const unsigned int spectrum=1):
      _width(0),_allocated_width(0),_data(0) {
      assign(n);
      cimglist_apply(*this,assign)(width,height,depth,spectrum);
    }

    //! Construct an image list containing n images with specified size, filled with specified value.
    CImgList(const unsigned int n, const unsigned int width, const unsigned int height,
             const unsigned int depth, const unsigned int spectrum, const T val):
      _width(0),_allocated_width(0),_data(0) {
      assign(n);
      cimglist_apply(*this,assign)(width,height,depth,spectrum,val);
    }

    //! Construct an image list containing n images with specified size and specified pixel values (int version).
    CImgList(const unsigned int n, const unsigned int width, const unsigned int height,
             const unsigned int depth, const unsigned int spectrum, const int val0, const int val1, ...):
      _width(0),_allocated_width(0),_data(0) {
#define _CImgList_stdarg(t) { \
        assign(n,width,height,depth,spectrum); \
        const unsigned int siz = width*height*depth*spectrum, nsiz = siz*n; \
        T *ptrd = _data->_data; \
        va_list ap; \
        va_start(ap,val1); \
        for (unsigned int l = 0, s = 0, i = 0; i<nsiz; ++i) { \
          *(ptrd++) = (T)(i==0?val0:(i==1?val1:va_arg(ap,t))); \
          if ((++s)==siz) { ptrd = _data[++l]._data; s = 0; } \
        } \
        va_end(ap); \
      }
      _CImgList_stdarg(int);
    }

    //! Construct an image list containing n images with specified size and specified pixel values (double version).
    CImgList(const unsigned int n, const unsigned int width, const unsigned int height,
             const unsigned int depth, const unsigned int spectrum, const double val0, const double val1, ...):
      _width(0),_allocated_width(0),_data(0) {
      _CImgList_stdarg(double);
    }

    //! Construct a list containing n copies of the image img.
    template<typename t>
    CImgList(const unsigned int n, const CImg<t>& img, const bool shared=false):
      _width(0),_allocated_width(0),_data(0) {
      assign(n);
      cimglist_apply(*this,assign)(img,shared);
    }

    //! Construct an image list from one image.
    template<typename t>
    explicit CImgList(const CImg<t>& img, const bool shared=false):
      _width(0),_allocated_width(0),_data(0) {
      assign(1);
      _data[0].assign(img,shared);
    }

    //! Construct an image list from two images.
    template<typename t1, typename t2>
    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const bool shared=false):
      _width(0),_allocated_width(0),_data(0) {
      assign(2);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared);
    }

    //! Construct an image list from three images.
    template<typename t1, typename t2, typename t3>
    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const bool shared=false):
      _width(0),_allocated_width(0),_data(0) {
      assign(3);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared);
    }

    //! Construct an image list from four images.
    template<typename t1, typename t2, typename t3, typename t4>
    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4, const bool shared=false):
      _width(0),_allocated_width(0),_data(0) {
      assign(4);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
    }

    //! Construct an image list from five images.
    template<typename t1, typename t2, typename t3, typename t4, typename t5>
    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
             const CImg<t5>& img5, const bool shared=false):
      _width(0),_allocated_width(0),_data(0) {
      assign(5);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
      _data[4].assign(img5,shared);
    }

    //! Construct an image list from six images.
    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6>
    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
             const CImg<t5>& img5, const CImg<t6>& img6, const bool shared=false):
      _width(0),_allocated_width(0),_data(0) {
      assign(6);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
      _data[4].assign(img5,shared); _data[5].assign(img6,shared);
    }

    //! Construct an image list from seven images.
    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6, typename t7>
    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
             const CImg<t5>& img5, const CImg<t6>& img6, const CImg<t7>& img7, const bool shared=false):
      _width(0),_allocated_width(0),_data(0) {
      assign(7);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
      _data[4].assign(img5,shared); _data[5].assign(img6,shared); _data[6].assign(img7,shared);
    }

    //! Construct an image list from eight images.
    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6, typename t7, typename t8>
    CImgList(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
             const CImg<t5>& img5, const CImg<t6>& img6, const CImg<t7>& img7, const CImg<t8>& img8, const bool shared=false):
      _width(0),_allocated_width(0),_data(0) {
      assign(8);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
      _data[4].assign(img5,shared); _data[5].assign(img6,shared); _data[6].assign(img7,shared); _data[7].assign(img8,shared);
    }

    //! Default copy constructor.
    template<typename t>
    CImgList(const CImgList<t>& list):_width(0),_allocated_width(0),_data(0) {
      assign(list._width);
      cimglist_for(*this,l) _data[l].assign(list[l],false);
    }

    CImgList(const CImgList<T>& list):_width(0),_allocated_width(0),_data(0) {
      assign(list._width);
      cimglist_for(*this,l) _data[l].assign(list[l],list[l]._is_shared);
    }

    //! Advanced copy constructor.
    template<typename t>
    CImgList(const CImgList<t>& list, const bool shared):_width(0),_allocated_width(0),_data(0) {
      assign(list._width);
      cimglist_for(*this,l) _data[l].assign(list[l],shared);
    }

    //! Construct an image list from a filename.
    explicit CImgList(const char *const filename):_width(0),_allocated_width(0),_data(0) {
      assign(filename);
    }

    //! Construct an image list from a display.
    explicit CImgList(const CImgDisplay &disp):_width(0),_allocated_width(0),_data(0) {
      assign(disp);
    }

    //! Return a shared instance of the list.
    CImgList<T> get_shared() {
      CImgList<T> res(_width);
      cimglist_for(*this,l) res[l].assign(_data[l],true);
      return res;
    }

    //! Return a shared instance of the list.
    const CImgList<T> get_shared() const {
      CImgList<T> res(_width);
      cimglist_for(*this,l) res[l].assign(_data[l],true);
      return res;
    }

    //! In-place version of the default constructor.
    /**
       This function is strictly equivalent to \ref assign() and has been
       introduced for having a STL-compliant function name.
    **/
    CImgList<T>& clear() {
      return assign();
    }

    //! In-place version of the default constructor and default destructor.
    CImgList<T>& assign() {
      delete[] _data;
      _width = _allocated_width = 0;
      _data = 0;
      return *this;
    }

    //! In-place version of the corresponding constructor.
    CImgList<T>& assign(const unsigned int n) {
      if (n) {
        if (_allocated_width<n || _allocated_width>(n<<2)) {
          delete[] _data;
          _data = new CImg<T>[_allocated_width=cimg::max(16UL,cimg::nearest_pow2(n))];
        }
        _width = n;
      } else assign();
      return *this;
    }

    //! In-place version of the corresponding constructor.
    CImgList<T>& assign(const unsigned int n, const unsigned int width, const unsigned int height=1,
                        const unsigned int depth=1, const unsigned int spectrum=1) {
      assign(n);
      cimglist_apply(*this,assign)(width,height,depth,spectrum);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    CImgList<T>& assign(const unsigned int n, const unsigned int width, const unsigned int height,
                        const unsigned int depth, const unsigned int spectrum, const T val) {
      assign(n);
      cimglist_apply(*this,assign)(width,height,depth,spectrum,val);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    CImgList<T>& assign(const unsigned int n, const unsigned int width, const unsigned int height,
                        const unsigned int depth, const unsigned int spectrum, const int val0, const int val1, ...) {
      _CImgList_stdarg(int);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    CImgList<T>& assign(const unsigned int n, const unsigned int width, const unsigned int height,
                        const unsigned int depth, const unsigned int spectrum, const double val0, const double val1, ...) {
      _CImgList_stdarg(double);
      return *this;
    }

    //! In-place version of the copy constructor.
    CImgList<T>& assign(const CImgList<T>& list, const bool shared=false) {
      if (this==&list) return *this;
      CImgList<T> res(list._width);
      cimglist_for(res,l) res[l].assign(list[l],shared);
      return res.move_to(*this);
    }

    template<typename t>
    CImgList<T>& assign(const CImgList<t>& list, const bool shared=false) {
      assign(list._width);
      cimglist_for(*this,l) _data[l].assign(list[l],shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    template<typename t>
    CImgList<T>& assign(const unsigned int n, const CImg<t>& img, const bool shared=false) {
      assign(n);
      cimglist_apply(*this,assign)(img,shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    template<typename t>
    CImgList<T>& assign(const CImg<t>& img, const bool shared=false) {
      assign(1);
      _data[0].assign(img,shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    template<typename t1, typename t2>
    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const bool shared=false) {
      assign(2);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    template<typename t1, typename t2, typename t3>
    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const bool shared=false) {
      assign(3);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    template<typename t1, typename t2, typename t3, typename t4>
    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
                        const bool shared=false) {
      assign(4);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    template<typename t1, typename t2, typename t3, typename t4, typename t5>
    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
                        const CImg<t5>& img5, const bool shared=false) {
      assign(5);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
      _data[4].assign(img5,shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6>
    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
                        const CImg<t5>& img5, const CImg<t6>& img6, const bool shared=false) {
      assign(6);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
      _data[4].assign(img5,shared); _data[5].assign(img6,shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6, typename t7>
    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
                        const CImg<t5>& img5, const CImg<t6>& img6, const CImg<t7>& img7, const bool shared=false) {
      assign(7);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
      _data[4].assign(img5,shared); _data[5].assign(img6,shared); _data[6].assign(img7,shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    template<typename t1, typename t2, typename t3, typename t4, typename t5, typename t6, typename t7, typename t8>
    CImgList<T>& assign(const CImg<t1>& img1, const CImg<t2>& img2, const CImg<t3>& img3, const CImg<t4>& img4,
                        const CImg<t5>& img5, const CImg<t6>& img6, const CImg<t7>& img7, const CImg<t8>& img8,
                        const bool shared=false) {
      assign(8);
      _data[0].assign(img1,shared); _data[1].assign(img2,shared); _data[2].assign(img3,shared); _data[3].assign(img4,shared);
      _data[4].assign(img5,shared); _data[5].assign(img6,shared); _data[6].assign(img7,shared); _data[7].assign(img8,shared);
      return *this;
    }

    //! In-place version of the corresponding constructor.
    CImgList<T>& assign(const char *const filename) {
      return load(filename);
    }

    //! In-place version of the corresponding constructor.
    CImgList<T>& assign(const CImgDisplay &disp) {
      return assign(CImg<T>(disp));
    }

    //! Move the content of the instance image list into another one.
    template<typename t>
    CImgList<t>& move_to(CImgList<t>& list) {
      list.assign(_width);
      bool is_one_shared_element = false;
      cimglist_for(*this,l) is_one_shared_element|=_data[l]._is_shared;
      if (is_one_shared_element) cimglist_for(*this,l) list[l].assign(_data[l]);
      else cimglist_for(*this,l) _data[l].move_to(list[l]);
      assign();
      return list;
    }

    template<typename t>
    CImgList<t>& move_to(CImgList<t>& list, const unsigned int pos) {
      if (is_empty()) return list;
      const unsigned int npos = pos>list._width?list._width:pos;
      list.insert(_width,npos);
      bool is_one_shared_element = false;
      cimglist_for(*this,l) is_one_shared_element|=_data[l]._is_shared;
      if (is_one_shared_element) cimglist_for(*this,l) list[npos+l].assign(_data[l]);
      else cimglist_for(*this,l) _data[l].move_to(list[npos+l]);
      assign();
      return list;
    }

    //! Swap all fields of two CImgList instances (use with care !)
    CImgList<T>& swap(CImgList<T>& list) {
      cimg::swap(_width,list._width);
      cimg::swap(_allocated_width,list._allocated_width);
      cimg::swap(_data,list._data);
      return list;
    }

    //! Return a reference to an empty list.
    static CImgList<T>& empty() {
      static CImgList<T> _empty;
      return _empty.assign();
    }

    //@}
    //------------------------------------------
    //
    //! \name Overloaded Operators
    //@{
    //------------------------------------------

    //! Return a reference to the i-th element of the image list.
    CImg<T>& operator()(const unsigned int pos) {
#if cimg_verbosity>=3
      if (pos>=_width) {
        cimg::warn(_cimglist_instance
                   "operator() : Invalid image request, at position [%u].",
                   cimglist_instance,
                   pos);
        return *_data;
      }
#endif
      return _data[pos];
    }

    const CImg<T>& operator()(const unsigned int pos) const {
      return const_cast<CImgList<T>*>(this)->operator()(pos);
    }

    //! Return a reference to (x,y,z,c) pixel of the pos-th image of the list
    T& operator()(const unsigned int pos, const unsigned int x, const unsigned int y=0,
                  const unsigned int z=0, const unsigned int c=0) {
      return (*this)[pos](x,y,z,c);
    }
    const T& operator()(const unsigned int pos, const unsigned int x, const unsigned int y=0,
                        const unsigned int z=0, const unsigned int c=0) const {
      return (*this)[pos](x,y,z,c);
    }

    //! Return address of the image vector.
    operator const CImg<T>*() const {
      return _data;
    }

    operator CImg<T>*() {
      return _data;
    }

    //! Operator=().
    template<typename t>
    CImgList<T>& operator=(const CImg<t>& img) {
      return assign(img);
    }

    //! Operator=().
    CImgList<T>& operator=(const CImgDisplay& disp) {
      return assign(disp);
    }

    //! Operator=().
    template<typename t>
    CImgList<T>& operator=(const CImgList<t>& list) {
      return assign(list);
    }

    CImgList<T>& operator=(const CImgList<T>& list) {
      return assign(list);
    }

    //! Operator=().
    CImgList<T>& operator=(const char *const filename) {
      return assign(filename);
    }

    //! Operator+() (unary).
    /**
       Writting '+list' is a convenient shortcut to 'CImgList<T>(list,false)'
       (forces a copy with non-shared elements).
     **/
    CImgList<T> operator+() const {
      return CImgList<T>(*this,false);
    }

    //! Operator,().
    template<typename t>
    CImgList<T>& operator,(const CImg<t>& img) {
      return insert(img);
    }

    //! Operator,().
    template<typename t>
    CImgList<T>& operator,(const CImgList<t>& list) {
      return insert(list);
    }

    //! Operator>().
    CImg<T> operator>(const char axis) const {
      return get_append(axis,0);
    }

    //! Operator<().
    CImgList<T> operator<(const char axis) const {
      return get_split(axis);
    }

    //@}
    //-------------------------------------
    //
    //! \name Instance Characteristics
    //@{
    //-------------------------------------

    //! Return a string describing the type of the image pixels in the list (template parameter \p T).
    static const char* pixel_type() {
      return cimg::type<T>::string();
    }

    //! Return the size of the list.
    int width() const {
      return (int)_width;
    }

    //! Return the size of the list.
    unsigned int size() const {
      return _width;
    }

    //! Return a pointer to the image buffer.
    CImg<T> *data() {
      return _data;
    }

    const CImg<T> *data() const {
      return _data;
    }

    //! Return a pointer to the image buffer.
#if cimg_verbosity>=3
    CImg<T> *data(const unsigned int l) {
      if (l>=size()) {
        cimg::warn(_cimglist_instance
                   "data() : Invalid pointer request, at position [%u].",
                   cimglist_instance,
                   l);
        return _data;
      }
      return _data + l;
    }

    const CImg<T> *data(const unsigned int l) const {
      return const_cast<CImgList<T>*>(this)->data(l);
    }
#else
    CImg<T> *data(const unsigned int l) {
      return _data + l;
    }

    const CImg<T> *data(const unsigned int l) const {
      return _data + l;
    }
#endif

    //! Returns an iterator to the beginning of the vector (STL-compliant name).
    iterator begin() {
      return _data;
    }

    const_iterator begin() const {
      return _data;
    }

    //! Returns an iterator just past the last element (STL-compliant name).
    iterator end() {
      return _data + _width;
    }

    const_iterator end() const {
      return _data + _width;
    }

    //! Returns a reference to the first element (STL-compliant name).
    CImg<T>& front() {
      return *_data;
    }

    const CImg<T>& front() const {
      return *_data;
    }

    //! Return a reference to the last image (STL-compliant name).
    const CImg<T>& back() const {
      return *(_data + _width - 1);
    }

    CImg<T>& back() {
      return *(_data + _width - 1);
    }

    //! Read an image in specified position.
    CImg<T>& at(const int pos) {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "at() : Empty instance.",
                                    cimglist_instance);

      return _data[pos<0?0:pos>=(int)_width?(int)_width-1:pos];
    }

    //! Read a pixel value with Dirichlet boundary conditions.
    T& atNXYZC(const int pos, const int x, const int y, const int z, const int c, const T out_val) {
      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_val)=out_val):_data[pos].atXYZC(x,y,z,c,out_val);
    }

    T atNXYZC(const int pos, const int x, const int y, const int z, const int c, const T out_val) const {
      return (pos<0 || pos>=(int)_width)?out_val:_data[pos].atXYZC(x,y,z,c,out_val);
    }

    //! Read a pixel value with Neumann boundary conditions.
    T& atNXYZC(const int pos, const int x, const int y, const int z, const int c) {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atNXYZC() : Empty instance.",
                                    cimglist_instance);

      return _atNXYZC(pos,x,y,z,c);
    }

    T atNXYZC(const int pos, const int x, const int y, const int z, const int c) const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atNXYZC() : Empty instance.",
                                    cimglist_instance);

      return _atNXYZC(pos,x,y,z,c);
    }

    T& _atNXYZC(const int pos, const int x, const int y, const int z, const int c) {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)].atXYZC(x,y,z,c);
    }

    T _atNXYZC(const int pos, const int x, const int y, const int z, const int c) const {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)].atXYZC(x,y,z,c);
    }

    //! Read a pixel value with Dirichlet boundary conditions for the four first coordinates (\c pos, \c x,\c y,\c z).
    T& atNXYZ(const int pos, const int x, const int y, const int z, const int c, const T out_val) {
      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_val)=out_val):_data[pos].atXYZ(x,y,z,c,out_val);
    }

    T atNXYZ(const int pos, const int x, const int y, const int z, const int c, const T out_val) const {
      return (pos<0 || pos>=(int)_width)?out_val:_data[pos].atXYZ(x,y,z,c,out_val);
    }

    //! Read a pixel value with Neumann boundary conditions for the four first coordinates (\c pos, \c x,\c y,\c z).
    T& atNXYZ(const int pos, const int x, const int y, const int z, const int c=0) {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atNXYZ() : Empty instance.",
                                    cimglist_instance);

      return _atNXYZ(pos,x,y,z,c);
    }

    T atNXYZ(const int pos, const int x, const int y, const int z, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atNXYZ() : Empty instance.",
                                    cimglist_instance);

      return _atNXYZ(pos,x,y,z,c);
    }

    T& _atNXYZ(const int pos, const int x, const int y, const int z, const int c=0) {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)].atXYZ(x,y,z,c);
    }

    T _atNXYZ(const int pos, const int x, const int y, const int z, const int c=0) const {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)].atXYZ(x,y,z,c);
    }

    //! Read a pixel value with Dirichlet boundary conditions for the three first coordinates (\c pos, \c x,\c y).
    T& atNXY(const int pos, const int x, const int y, const int z, const int c, const T out_val) {
      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_val)=out_val):_data[pos].atXY(x,y,z,c,out_val);
    }

    T atNXY(const int pos, const int x, const int y, const int z, const int c, const T out_val) const {
      return (pos<0 || pos>=(int)_width)?out_val:_data[pos].atXY(x,y,z,c,out_val);
    }

    //! Read a pixel value with Neumann boundary conditions for the three first coordinates (\c pos, \c x,\c y).
    T& atNXY(const int pos, const int x, const int y, const int z=0, const int c=0) {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atNXY() : Empty instance.",
                                    cimglist_instance);

      return _atNXY(pos,x,y,z,c);
    }

    T atNXY(const int pos, const int x, const int y, const int z=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atNXY() : Empty instance.",
                                    cimglist_instance);

      return _atNXY(pos,x,y,z,c);
    }

    T& _atNXY(const int pos, const int x, const int y, const int z=0, const int c=0) {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)].atXY(x,y,z,c);
    }

    T _atNXY(const int pos, const int x, const int y, const int z=0, const int c=0) const {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)].atXY(x,y,z,c);
    }

    //! Read a pixel value with Dirichlet boundary conditions for the two first coordinates (\c pos,\c x).
    T& atNX(const int pos, const int x, const int y, const int z, const int c, const T out_val) {
      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_val)=out_val):_data[pos].atX(x,y,z,c,out_val);
    }

    T atNX(const int pos, const int x, const int y, const int z, const int c, const T out_val) const {
      return (pos<0 || pos>=(int)_width)?out_val:_data[pos].atX(x,y,z,c,out_val);
    }

    //! Read a pixel value with Neumann boundary conditions for the two first coordinates (\c pos, \c x).
    T& atNX(const int pos, const int x, const int y=0, const int z=0, const int c=0) {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atNX() : Empty instance.",
                                    cimglist_instance);

      return _atNX(pos,x,y,z,c);
    }

    T atNX(const int pos, const int x, const int y=0, const int z=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atNX() : Empty instance.",
                                    cimglist_instance);

      return _atNX(pos,x,y,z,c);
    }

    T& _atNX(const int pos, const int x, const int y=0, const int z=0, const int c=0) {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)].atX(x,y,z,c);
    }

    T _atNX(const int pos, const int x, const int y=0, const int z=0, const int c=0) const {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)].atX(x,y,z,c);
    }

    //! Read a pixel value with Dirichlet boundary conditions for the first coordinates (\c pos).
    T& atN(const int pos, const int x, const int y, const int z, const int c, const T out_val) {
      return (pos<0 || pos>=(int)_width)?(cimg::temporary(out_val)=out_val):(*this)(pos,x,y,z,c);
    }

    T atN(const int pos, const int x, const int y, const int z, const int c, const T out_val) const {
      return (pos<0 || pos>=(int)_width)?out_val:(*this)(pos,x,y,z,c);
    }

    //! Read a pixel value with Neumann boundary conditions for the first coordinates (\c pos).
    T& atN(const int pos, const int x=0, const int y=0, const int z=0, const int c=0) {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atN() : Empty instance.",
                                    cimglist_instance);
      return _atN(pos,x,y,z,c);
    }

    T atN(const int pos, const int x=0, const int y=0, const int z=0, const int c=0) const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "atN() : Empty instance.",
                                    cimglist_instance);
      return _atN(pos,x,y,z,c);
    }

    T& _atN(const int pos, const int x=0, const int y=0, const int z=0, const int c=0) {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)](x,y,z,c);
    }

    T _atN(const int pos, const int x=0, const int y=0, const int z=0, const int c=0) const {
      return _data[pos<0?0:(pos>=(int)_width?(int)_width-1:pos)](x,y,z,c);
    }

    //! Return a C-string containing the values of all images in the instance list.
    CImg<charT> value_string(const char separator=',', const unsigned int max_size=0) const {
      if (is_empty()) return CImg<ucharT>(1,1,1,1,0);
      CImgList<charT> items;
      for (unsigned int l = 0; l<_width-1; ++l) {
        CImg<charT> item = _data[l].value_string(separator,0);
        item.back() = separator;
        item.move_to(items);
      }
      _data[_width-1].value_string(separator,0).move_to(items);
      CImg<charT> res; (items>'x').move_to(res);
      if (max_size) { res.crop(0,max_size); res(max_size) = 0; }
      return res;
    }

    //@}
    //-------------------------------------
    //
    //! \name Instance Checking
    //@{
    //-------------------------------------

    //! Return \p true if list is empty.
    bool is_empty() const {
      return (!_data || !_width);
    }

    //! Return \p true if list if of specified size.
    bool is_sameN(const unsigned int n) const {
      return (_width==n);
    }

    //! Return \p true if list if of specified size.
    template<typename t>
    bool is_sameN(const CImgList<t>& list) const {
      return (_width==list._width);
    }

    // Define useful dimension check functions.
    // (not documented because they are macro-generated).
#define _cimglist_def_is_same1(axis) \
    bool is_same##axis(const unsigned int val) const { \
      bool res = true; for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_same##axis(val); return res; \
    } \
    bool is_sameN##axis(const unsigned int n, const unsigned int val) const { \
      return is_sameN(n) && is_same##axis(val); \
    } \

#define _cimglist_def_is_same2(axis1,axis2) \
    bool is_same##axis1##axis2(const unsigned int val1, const unsigned int val2) const { \
      bool res = true; for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_same##axis1##axis2(val1,val2); return res; \
    } \
    bool is_sameN##axis1##axis2(const unsigned int n, const unsigned int val1, const unsigned int val2) const { \
      return is_sameN(n) && is_same##axis1##axis2(val1,val2); \
    } \

#define _cimglist_def_is_same3(axis1,axis2,axis3) \
    bool is_same##axis1##axis2##axis3(const unsigned int val1, const unsigned int val2, const unsigned int val3) const { \
      bool res = true; for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_same##axis1##axis2##axis3(val1,val2,val3); return res; \
    } \
    bool is_sameN##axis1##axis2##axis3(const unsigned int n, const unsigned int val1, const unsigned int val2, const unsigned int val3) const { \
      return is_sameN(n) && is_same##axis1##axis2##axis3(val1,val2,val3); \
    } \

#define _cimglist_def_is_same(axis) \
    template<typename t> bool is_same##axis(const CImg<t>& img) const { \
      bool res = true; for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_same##axis(img); return res; \
    } \
    template<typename t> bool is_same##axis(const CImgList<t>& list) const { \
      const unsigned int lmin = cimg::min(_width,list._width); \
      bool res = true; for (unsigned int l = 0; l<lmin && res; ++l) res = _data[l].is_same##axis(list[l]); return res; \
    } \
    template<typename t> bool is_sameN##axis(const unsigned int n, const CImg<t>& img) const { \
      return (is_sameN(n) && is_same##axis(img)); \
    } \
    template<typename t> bool is_sameN##axis(const CImgList<t>& list) const { \
      return (is_sameN(list) && is_same##axis(list)); \
    }

    _cimglist_def_is_same(XY)
    _cimglist_def_is_same(XZ)
    _cimglist_def_is_same(XC)
    _cimglist_def_is_same(YZ)
    _cimglist_def_is_same(YC)
    _cimglist_def_is_same(XYZ)
    _cimglist_def_is_same(XYC)
    _cimglist_def_is_same(YZC)
    _cimglist_def_is_same(XYZC)
    _cimglist_def_is_same1(X)
    _cimglist_def_is_same1(Y)
    _cimglist_def_is_same1(Z)
    _cimglist_def_is_same1(C)
    _cimglist_def_is_same2(X,Y)
    _cimglist_def_is_same2(X,Z)
    _cimglist_def_is_same2(X,C)
    _cimglist_def_is_same2(Y,Z)
    _cimglist_def_is_same2(Y,C)
    _cimglist_def_is_same2(Z,C)
    _cimglist_def_is_same3(X,Y,Z)
    _cimglist_def_is_same3(X,Y,C)
    _cimglist_def_is_same3(X,Z,C)
    _cimglist_def_is_same3(Y,Z,C)

    bool is_sameXYZC(const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc) const {
      bool res = true;
      for (unsigned int l = 0; l<_width && res; ++l) res = _data[l].is_sameXYZC(dx,dy,dz,dc);
      return res;
    }

    bool is_sameNXYZC(const unsigned int n, const unsigned int dx, const unsigned int dy, const unsigned int dz, const unsigned int dc) const {
      return is_sameN(n) && is_sameXYZC(dx,dy,dz,dc);
    }

    //! Return \c true if the list contains the pixel (n,x,y,z,c).
    bool containsNXYZC(const int n, const int x=0, const int y=0, const int z=0, const int c=0) const {
      if (is_empty()) return false;
      return n>=0 && n<(int)_width && x>=0 && x<_data[n].width() && y>=0 && y<_data[n].height() &&
        z>=0 && z<_data[n].depth() && c>=0 && c<_data[n].spectrum();
    }

    //! Return \c true if the list contains the image (n).
    bool containsN(const int n) const {
      if (is_empty()) return false;
      return n>=0 && n<(int)_width;
    }

    //! Return \c true if one of the image list contains the specified referenced value. If true, set coordinates (n,x,y,z,c).
    template<typename t>
    bool contains(const T& pixel, t& n, t& x, t&y, t& z, t& c) const {
      if (is_empty()) return false;
      cimglist_for(*this,l) if (_data[l].contains(pixel,x,y,z,c)) { n = (t)l; return true; }
      return false;
    }

    //! Return \c true if one of the image list contains the specified referenced value. If true, set coordinates (n,x,y,z).
    template<typename t>
    bool contains(const T& pixel, t& n, t& x, t&y, t& z) const {
      t c;
      return contains(pixel,n,x,y,z,c);
    }

    //! Return \c true if one of the image list contains the specified referenced value. If true, set coordinates (n,x,y).
    template<typename t>
    bool contains(const T& pixel, t& n, t& x, t&y) const {
      t z, c;
      return contains(pixel,n,x,y,z,c);
    }

    //! Return \c true if one of the image list contains the specified referenced value. If true, set coordinates (n,x).
    template<typename t>
    bool contains(const T& pixel, t& n, t& x) const {
      t y, z, c;
      return contains(pixel,n,x,y,z,c);
    }

    //! Return \c true if one of the image list contains the specified referenced value. If true, set coordinates (n).
    template<typename t>
    bool contains(const T& pixel, t& n) const {
      t x, y, z, c;
      return contains(pixel,n,x,y,z,c);
    }

    //! Return \c true if one of the image list contains the specified referenced value.
    bool contains(const T& pixel) const {
      unsigned int n, x, y, z, c;
      return contains(pixel,n,x,y,z,c);
    }

    //! Return \c true if the list contains the image 'img'. If true, returns the position (n) of the image in the list.
    template<typename t>
    bool contains(const CImg<T>& img, t& n) const {
      if (is_empty()) return false;
      const CImg<T> *const ptr = &img;
      cimglist_for(*this,i) if (_data+i==ptr) { n = (t)i; return true; }
      return false;
    }

    //! Return \c true if the list contains the image img.
    bool contains(const CImg<T>& img) const {
      unsigned int n;
      return contains(img,n);
    }

    //@}
    //-------------------------------------
    //
    //! \name Mathematical Functions
    //@{
    //-------------------------------------

    //! Return a reference to the minimum pixel value of the instance list.
    T& min() {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "min() : Empty instance.",
                                    cimglist_instance);
      T *ptr_min = _data->_data;
      T min_value = *ptr_min;
      cimglist_for(*this,l) {
        const CImg<T>& img = _data[l];
        cimg_for(img,ptrs,T) if (*ptrs<min_value) min_value = *(ptr_min=ptrs);
      }
      return *ptr_min;
    }

    const T& min() const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "min() : Empty instance.",
                                    cimglist_instance);
      const T *ptr_min = _data->_data;
      T min_value = *ptr_min;
      cimglist_for(*this,l) {
        const CImg<T>& img = _data[l];
        cimg_for(img,ptrs,T) if (*ptrs<min_value) min_value = *(ptr_min=ptrs);
      }
      return *ptr_min;
    }

    //! Return a reference to the maximum pixel value of the instance list.
    T& max() {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "max() : Empty instance.",
                                    cimglist_instance);
      T *ptr_max = _data->_data;
      T max_value = *ptr_max;
      cimglist_for(*this,l) {
        const CImg<T>& img = _data[l];
        cimg_for(img,ptrs,T) if (*ptrs>max_value) max_value = *(ptr_max=ptrs);
      }
      return *ptr_max;
    }

    const T& max() const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "max() : Empty instance.",
                                    cimglist_instance);
      const T *ptr_max = _data->_data;
      T max_value = *ptr_max;
      cimglist_for(*this,l) {
        const CImg<T>& img = _data[l];
        cimg_for(img,ptrs,T) if (*ptrs>max_value) max_value = *(ptr_max=ptrs);
      }
      return *ptr_max;
    }

    //! Return a reference to the minimum pixel value of the instance list.
    template<typename t>
    T& min_max(t& max_val) {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "min_max() : Empty instance.",
                                    cimglist_instance);
      T *ptr_min = _data->_data;
      T min_value = *ptr_min, max_value = min_value;
      cimglist_for(*this,l) {
        const CImg<T>& img = _data[l];
        cimg_for(img,ptrs,T) {
          const T val = *ptrs;
          if (val<min_value) { min_value = val; ptr_min = ptrs; }
          if (val>max_value) max_value = val;
        }
      }
      max_val = (t)max_value;
      return *ptr_min;
    }

    template<typename t>
    const T& min_max(t& max_val) const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "min_max() : Empty instance.",
                                    cimglist_instance);
      const T *ptr_min = _data->_data;
      T min_value = *ptr_min, max_value = min_value;
      cimglist_for(*this,l) {
        const CImg<T>& img = _data[l];
        cimg_for(img,ptrs,T) {
          const T val = *ptrs;
          if (val<min_value) { min_value = val; ptr_min = ptrs; }
          if (val>max_value) max_value = val;
        }
      }
      max_val = (t)max_value;
      return *ptr_min;
    }

    //! Return a reference to the minimum pixel value of the instance list.
    template<typename t>
    T& max_min(t& min_val) {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "max_min() : Empty instance.",
                                    cimglist_instance);
      T *ptr_max = _data->_data;
      T min_value = *ptr_max, max_value = min_value;
      cimglist_for(*this,l) {
        const CImg<T>& img = _data[l];
        cimg_for(img,ptrs,T) {
          const T val = *ptrs;
          if (val>max_value) { max_value = val; ptr_max = ptrs; }
          if (val<min_value) min_value = val;
        }
      }
      min_val = (t)min_value;
      return *ptr_max;
    }

    template<typename t>
    const T& max_min(t& min_val) const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "max_min() : Empty instance.",
                                    cimglist_instance);
      const T *ptr_max = _data->_data;
      T min_value = *ptr_max, max_value = min_value;
      cimglist_for(*this,l) {
        const CImg<T>& img = _data[l];
        cimg_for(img,ptrs,T) {
          const T val = *ptrs;
          if (val>max_value) { max_value = val; ptr_max = ptrs; }
          if (val<min_value) min_value = val;
        }
      }
      min_val = (t)min_value;
      return *ptr_max;
    }

    //@}
    //---------------------------
    //
    //! \name List Manipulation
    //@{
    //---------------------------

    //! Insert a copy of the image \p img into the current image list, at position \p pos.
    template<typename t>
    CImgList<T>& insert(const CImg<t>& img, const unsigned int pos=~0U, const bool shared=false) {
      const unsigned int npos = pos==~0U?_width:pos;
      if (npos>_width)
        throw CImgArgumentException(_cimglist_instance
                                    "insert() : Invalid insertion request of specified image (%u,%u,%u,%u,%p) at position %u.",
                                    cimglist_instance,
                                    img._width,img._height,img._depth,img._spectrum,img._data,npos);
      if (shared)
        throw CImgArgumentException(_cimglist_instance
                                    "insert() : Invalid insertion request of specified shared image CImg<%s>(%u,%u,%u,%u,%p) at position %u "
                                    "(pixel types are different).",
                                    cimglist_instance,
                                    img.pixel_type(),img._width,img._height,img._depth,img._spectrum,img._data,npos);

      CImg<T> *const new_data = (++_width>_allocated_width)?new CImg<T>[_allocated_width?(_allocated_width<<=1):(_allocated_width=16)]:0;
      if (!_width || !_data) {
        _data = new_data;
        *_data = img;
      } else {
        if (new_data) {
          if (npos) std::memcpy(new_data,_data,sizeof(CImg<T>)*npos);
          if (npos!=_width-1) std::memcpy(new_data+npos+1,_data+npos,sizeof(CImg<T>)*(_width-1-npos));
          std::memset(_data,0,sizeof(CImg<T>)*(_width-1));
          delete[] _data;
          _data = new_data;
        } else if (npos!=_width-1) std::memmove(_data+npos+1,_data+npos,sizeof(CImg<T>)*(_width-1-npos));
        _data[npos]._width = _data[npos]._height = _data[npos]._depth = _data[npos]._spectrum = 0; _data[npos]._data = 0;
        _data[npos] = img;
      }
      return *this;
    }

    CImgList<T>& insert(const CImg<T>& img, const unsigned int pos=~0U, const bool shared=false) {
      const unsigned int npos = pos==~0U?_width:pos;
      if (npos>_width)
        throw CImgArgumentException(_cimglist_instance
                                    "insert() : Invalid insertion request of specified image (%u,%u,%u,%u,%p) at position %u.",
                                    cimglist_instance,
                                    img._width,img._height,img._depth,img._spectrum,img._data,npos);
      CImg<T> *const new_data = (++_width>_allocated_width)?new CImg<T>[_allocated_width?(_allocated_width<<=1):(_allocated_width=16)]:0;
      if (!_width || !_data) {
        _data = new_data;
        if (shared && img) {
          _data->_width = img._width; _data->_height = img._height; _data->_depth = img._depth; _data->_spectrum = img._spectrum;
          _data->_is_shared = true; _data->_data = img._data;
        } else *_data = img;
      }
      else {
        if (new_data) {
          if (npos) std::memcpy(new_data,_data,sizeof(CImg<T>)*npos);
          if (npos!=_width-1) std::memcpy(new_data+npos+1,_data+npos,sizeof(CImg<T>)*(_width-1-npos));
          if (shared && img) {
            new_data[npos]._width = img._width; new_data[npos]._height = img._height; new_data[npos]._depth = img._depth;
            new_data[npos]._spectrum = img._spectrum; new_data[npos]._is_shared = true; new_data[npos]._data = img._data;
          } else {
            new_data[npos]._width = new_data[npos]._height = new_data[npos]._depth = new_data[npos]._spectrum = 0; new_data[npos]._data = 0;
            new_data[npos] = img;
          }
          std::memset(_data,0,sizeof(CImg<T>)*(_width-1));
          delete[] _data;
          _data = new_data;
        } else {
          if (npos!=_width-1) std::memmove(_data+npos+1,_data+npos,sizeof(CImg<T>)*(_width-1-npos));
          if (shared && img) {
            _data[npos]._width = img._width; _data[npos]._height = img._height; _data[npos]._depth = img._depth; _data[npos]._spectrum = img._spectrum;
            _data[npos]._is_shared = true; _data[npos]._data = img._data;
          } else {
            _data[npos]._width = _data[npos]._height = _data[npos]._depth = _data[npos]._spectrum = 0; _data[npos]._data = 0;
            _data[npos] = img;
          }
        }
      }
      return *this;
    }

    template<typename t>
    CImgList<T> get_insert(const CImg<t>& img, const unsigned int pos=~0U, const bool shared=false) const {
      return (+*this).insert(img,pos,shared);
    }

    //! Insert n empty images img into the current image list, at position \p pos.
    CImgList<T>& insert(const unsigned int n, const unsigned int pos=~0U) {
      CImg<T> foo;
      if (!n) return *this;
      const unsigned int npos = pos==~0U?_width:pos;
      for (unsigned int i = 0; i<n; ++i) insert(foo,npos+i);
      return *this;
    }

    CImgList<T> get_insert(const unsigned int n, const unsigned int pos=~0U) const {
      return (+*this).insert(n,pos);
    }

    //! Insert n copies of the image \p img into the current image list, at position \p pos.
    template<typename t>
    CImgList<T>& insert(const unsigned int n, const CImg<t>& img, const unsigned int pos=~0U, const bool shared=false) {
      if (!n) return *this;
      const unsigned int npos = pos==~0U?_width:pos;
      insert(img,npos,shared);
      for (unsigned int i = 1; i<n; ++i) insert(_data[npos],npos+i,shared);
      return *this;
    }

    template<typename t>
    CImgList<T> get_insert(const unsigned int n, const CImg<t>& img, const unsigned int pos=~0U, const bool shared=false) const {
      return (+*this).insert(n,img,pos,shared);
    }

    //! Insert a copy of the image list \p list into the current image list, starting from position \p pos.
    template<typename t>
    CImgList<T>& insert(const CImgList<t>& list, const unsigned int pos=~0U, const bool shared=false) {
      const unsigned int npos = pos==~0U?_width:pos;
      if ((void*)this!=(void*)&list) cimglist_for(list,l) insert(list[l],npos+l,shared);
      else insert(CImgList<T>(list),npos,shared);
      return *this;
    }

    template<typename t>
    CImgList<T> get_insert(const CImgList<t>& list, const unsigned int pos=~0U, const bool shared=false) const {
      return (+*this).insert(list,pos,shared);
    }

    //! Insert n copies of the list \p list at position \p pos of the current list.
    template<typename t>
    CImgList<T>& insert(const unsigned int n, const CImgList<t>& list, const unsigned int pos=~0U, const bool shared=false) {
      if (!n) return *this;
      const unsigned int npos = pos==~0U?_width:pos;
      for (unsigned int i = 0; i<n; ++i) insert(list,npos,shared);
      return *this;
    }

    template<typename t>
    CImgList<T> get_insert(const unsigned int n, const CImgList<t>& list, const unsigned int pos=~0U, const bool shared=false) const {
      return (+*this).insert(n,list,pos,shared);
    }

    //! Remove the images from positions \p pos1 to \p pos2.
    CImgList<T>& remove(const unsigned int pos1, const unsigned int pos2) {
      const unsigned int
        npos1 = pos1<pos2?pos1:pos2,
        tpos2 = pos1<pos2?pos2:pos1,
        npos2 = tpos2<_width?tpos2:_width-1;
      if (npos1>=_width)
        throw CImgArgumentException(_cimglist_instance
                                    "remove() : Invalid remove request at positions %u->%u.",
                                    cimglist_instance,
                                    npos1,tpos2);
      else {
        if (tpos2>=_width)
          throw CImgArgumentException(_cimglist_instance
                                      "remove() : Invalid remove request at positions %u->%u.",
                                      cimglist_instance,
                                      npos1,tpos2);

        for (unsigned int k = npos1; k<=npos2; ++k) _data[k].assign();
        const unsigned int nb = 1 + npos2 - npos1;
        if (!(_width-=nb)) return assign();
        if (_width>(_allocated_width>>2) || _allocated_width<=8) { // Removing items without reallocation.
          if (npos1!=_width) std::memmove(_data+npos1,_data+npos2+1,sizeof(CImg<T>)*(_width - npos1));
          std::memset(_data + _width,0,sizeof(CImg<T>)*nb);
        } else { // Removing items with reallocation.
          _allocated_width>>=2;
          while (_allocated_width>8 && _width<(_allocated_width>>1)) _allocated_width>>=1;
          CImg<T> *const new_data = new CImg<T>[_allocated_width];
          if (npos1) std::memcpy(new_data,_data,sizeof(CImg<T>)*npos1);
          if (npos1!=_width) std::memcpy(new_data+npos1,_data+npos2+1,sizeof(CImg<T>)*(_width-npos1));
          if (_width!=_allocated_width) std::memset(new_data+_width,0,sizeof(_allocated_width - _width));
          std::memset(_data,0,sizeof(CImg<T>)*(_width+nb));
          delete[] _data;
          _data = new_data;
        }
      }
      return *this;
    }

    CImgList<T> get_remove(const unsigned int pos1, const unsigned int pos2) const {
      return (+*this).remove(pos1,pos2);
    }

    //! Remove the image at position \p pos from the image list.
    CImgList<T>& remove(const unsigned int pos) {
      return remove(pos,pos);
    }

    CImgList<T> get_remove(const unsigned int pos) const {
      return (+*this).remove(pos);
    }

    //! Remove the last image from the image list.
    CImgList<T>& remove() {
      return remove(_width-1);
    }

    CImgList<T> get_remove() const {
      return (+*this).remove();
    }

    //! Reverse list order.
    CImgList<T>& reverse() {
      for (unsigned int l = 0; l<_width/2; ++l) (*this)[l].swap((*this)[_width-1-l]);
      return *this;
    }

    CImgList<T> get_reverse() const {
      return (+*this).reverse();
    }

    //! Get a sub-list.
    CImgList<T>& images(const unsigned int i0, const unsigned int i1) {
      return get_images(i0,i1).move_to(*this);
    }

    CImgList<T> get_images(const unsigned int i0, const unsigned int i1) const {
      if (i0>i1 || i1>=_width)
        throw CImgArgumentException(_cimglist_instance
                                    "images() : Specified sub-list indices (%u->%u) are out of bounds.",
                                    cimglist_instance,
                                    i0,i1);
      CImgList<T> res(i1-i0+1);
      cimglist_for(res,l) res[l].assign(_data[i0+l]);
      return res;
    }

    //! Get a shared sub-list.
    CImgList<T> get_shared_images(const unsigned int i0, const unsigned int i1) {
      if (i0>i1 || i1>=_width)
        throw CImgArgumentException(_cimglist_instance
                                    "get_shared_images() : Specified sub-list indices (%u->%u) are out of bounds.",
                                    cimglist_instance,
                                    i0,i1);
      CImgList<T> res(i1-i0+1);
      cimglist_for(res,l) res[l].assign(_data[i0+l],true);
      return res;
    }

    const CImgList<T> get_shared_images(const unsigned int i0, const unsigned int i1) const {
      if (i0>i1 || i1>=_width)
        throw CImgArgumentException(_cimglist_instance
                                    "get_shared_images() : Specified sub-list indices (%u->%u) are out of bounds.",
                                    cimglist_instance,
                                    i0,i1);
      CImgList<T> res(i1-i0+1);
      cimglist_for(res,l) res[l].assign(_data[i0+l],true);
      return res;
    }

    //! Return a single image which is the concatenation of all images of the current CImgList instance.
    /**
       \param axis : specify the axis for image concatenation. Can be 'x','y','z' or 'c'.
       \param align : specify the alignment for image concatenation. Can be '0' (top), '0.5' (center) or '1' (bottom) for instance.
       \return A CImg<T> image corresponding to the concatenation is returned.
    **/
    CImg<T> get_append(const char axis, const float align=0) const {
      if (is_empty()) return CImg<T>();
      if (_width==1) return +((*this)[0]);
      unsigned int dx = 0, dy = 0, dz = 0, dc = 0, pos = 0;
      CImg<T> res;
      switch (cimg::uncase(axis)) {
      case 'x' : { // Along the X-axis.
        cimglist_for(*this,l) {
          const CImg<T>& img = (*this)[l];
          dx+=img._width; dy = cimg::max(dy,img._height); dz = cimg::max(dz,img._depth); dc = cimg::max(dc,img._spectrum);
        }
        res.assign(dx,dy,dz,dc,0);
        if (res) cimglist_for(*this,l) {
            res.draw_image(pos,
                           (int)(align*(dy-(*this)[l]._height)),
                           (int)(align*(dz-(*this)[l]._depth)),
                           (int)(align*(dc-(*this)[l]._spectrum)),
                           (*this)[l]);
            pos+=(*this)[l]._width;
          }
      } break;
      case 'y' : { // Along the Y-axis.
        cimglist_for(*this,l) {
          const CImg<T>& img = (*this)[l];
          dx = cimg::max(dx,img._width); dy+=img._height; dz = cimg::max(dz,img._depth); dc = cimg::max(dc,img._spectrum);
        }
        res.assign(dx,dy,dz,dc,0);
        if (res) cimglist_for(*this,l) {
            res.draw_image((int)(align*(dx-(*this)[l]._width)),
                           pos,
                           (int)(align*(dz-(*this)[l]._depth)),
                           (int)(align*(dc-(*this)[l]._spectrum)),
                           (*this)[l]);
            pos+=(*this)[l]._height;
          }
      } break;
      case 'z' : { // Along the Z-axis.
        cimglist_for(*this,l) {
          const CImg<T>& img = (*this)[l];
          dx = cimg::max(dx,img._width); dy = cimg::max(dy,img._height); dz+=img._depth; dc = cimg::max(dc,img._spectrum);
        }
        res.assign(dx,dy,dz,dc,0);
        if (res) cimglist_for(*this,l) {
            res.draw_image((int)(align*(dx-(*this)[l]._width)),
                           (int)(align*(dy-(*this)[l]._height)),
                           pos,
                           (int)(align*(dc-(*this)[l]._spectrum)),
                           (*this)[l]);
            pos+=(*this)[l]._depth;
          }
      } break;
      default : { // Along the C-axis.
        cimglist_for(*this,l) {
          const CImg<T>& img = (*this)[l];
          dx = cimg::max(dx,img._width); dy = cimg::max(dy,img._height); dz = cimg::max(dz,img._depth); dc+=img._spectrum;
        }
        res.assign(dx,dy,dz,dc,0);
        if (res) cimglist_for(*this,l) {
            res.draw_image((int)(align*(dx-(*this)[l]._width)),
                           (int)(align*(dy-(*this)[l]._height)),
                           (int)(align*(dz-(*this)[l]._depth)),
                           pos,
                           (*this)[l]);
            pos+=(*this)[l]._spectrum;
          }
      }
      }
      return res;
    }

    //! Return a list where each image has been split along the specified axis.
    CImgList<T>& split(const char axis, const int nb=0) {
      return get_split(axis,nb).move_to(*this);
    }

    CImgList<T> get_split(const char axis, const int nb=0) const {
      CImgList<T> res;
      cimglist_for(*this,l) _data[l].get_split(axis,nb).move_to(res,~0U);
      return res;
    }

    //! Insert image \p img at the end of the list (STL-compliant name).
    template<typename t>
    CImgList<T>& push_back(const CImg<t>& img) {
      return insert(img);
    }

    //! Insert image \p img at the front of the list (STL-compliant name).
    template<typename t>
    CImgList<T>& push_front(const CImg<t>& img) {
      return insert(img,0);
    }

    //! Insert list \p list at the end of the current list (STL-compliant name).
    template<typename t>
    CImgList<T>& push_back(const CImgList<t>& list) {
      return insert(list);
    }

    //! Insert list \p list at the front of the current list (STL-compliant name).
    template<typename t>
    CImgList<T>& push_front(const CImgList<t>& list) {
      return insert(list,0);
    }

    //! Remove last element of the list (STL-compliant name).
    CImgList<T>& pop_back() {
      return remove(_width-1);
    }

    //! Remove first element of the list (STL-compliant name).
    CImgList<T>& pop_front() {
      return remove(0);
    }

    //! Remove the element pointed by iterator \p iter (STL-compliant name).
    CImgList<T>& erase(const iterator iter) {
      return remove(iter-_data);
    }

    //@}
    //----------------------------------
    //
    //! \name Data Input
    //@{
    //----------------------------------

    //! Simple interface to select sub-lists or single images in a list.
    CImg<intT> get_select(CImgDisplay &disp, const bool feature_type=true,
                          const char axis='x', const float align=0) const {
      return _get_select(disp,0,feature_type,axis,align,0,false,false,false);
    }

    CImg<intT> get_select(const char *const title, const bool feature_type=true,
                          const char axis='x', const float align=0) const {
      CImgDisplay disp;
      return _get_select(disp,title,feature_type,axis,align,0,false,false,false);
    }

    CImg<intT> _get_select(CImgDisplay &disp, const char *const title, const bool feature_type,
                           const char axis, const float align,
                           const unsigned int orig, const bool resize_disp,
                           const bool exit_on_rightbutton, const bool exit_on_wheel) const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "select() : Empty instance.",
                                    cimglist_instance);

      // Create image correspondence table and get list dimensions for visualization.
      CImgList<uintT> _indices;
      unsigned int max_width = 0, max_height = 0, sum_width = 0, sum_height = 0;
      cimglist_for(*this,l) if (_data[l]) {
        const CImg<T>& img = _data[l];
        const unsigned int
          w = CImgDisplay::_fitscreen(img._width,img._height,img._depth,256,-85,false),
          h = CImgDisplay::_fitscreen(img._width,img._height,img._depth,256,-85,true);
        if (w>max_width) max_width = w;
        if (h>max_height) max_height = h;
        sum_width+=w; sum_height+=h;
        if (axis=='x') CImg<uintT>(w,1,1,1,(unsigned int)l).move_to(_indices);
        else CImg<uintT>(h,1,1,1,(unsigned int)l).move_to(_indices);
      }
      const CImg<uintT> indices0 = _indices>'x';

      // Create display window.
      if (!disp) {
        if (axis=='x') disp.assign(cimg_fitscreen(sum_width,max_height,1),title?title:0,1);
        else disp.assign(cimg_fitscreen(max_width,sum_height,1),title?title:0,1);
        if (!title) disp.set_title("CImgList<%s> (%u)",pixel_type(),_width);
      } else if (title) disp.set_title("%s",title);
      if (resize_disp) {
        if (axis=='x') disp.resize(cimg_fitscreen(sum_width,max_height,1),false);
        else disp.resize(cimg_fitscreen(max_width,sum_height,1),false);
      }

      const unsigned int old_normalization = disp.normalization();
      bool old_is_resized = disp.is_resized();
      disp._normalization = 0;
      disp.show().set_key(0);
      const unsigned char foreground_color[] = { 255,255,255 }, background_color[] = { 0,0,0 };

      // Enter event loop.
      CImg<ucharT> visu0, visu;
      CImg<uintT> indices;
      CImg<intT> positions(_width,4,1,1,-1);
      int oindice0 = -1, oindice1 = -1, indice0 = -1, indice1 = -1;
      bool is_clicked = false, is_selected = false, text_down = false, update_display = true;
      unsigned int key = 0;
      while (!is_selected && !disp.is_closed() && !key) {

        // Create background image.
        if (!visu0) {
          visu0.assign(disp._width,disp._height,1,3,0); visu.assign();
          (indices0.get_resize(axis=='x'?visu0._width:visu0._height,1)).move_to(indices);
          unsigned int ind = 0;
          if (axis=='x') for (unsigned int x = 0; x<visu0._width; ) {
              const unsigned int x0 = x;
              ind = indices[x];
              while (x<indices._width && indices[++x]==ind) {}
              const CImg<T>
                &src = _data[ind],
                _img2d = src._depth>1?src.get_projections2d(src._width/2,src._height/2,src._depth/2):CImg<T>(),
                &img2d = _img2d?_img2d:src;
              CImg<ucharT> res = old_normalization==1?CImg<ucharT>(img2d.get_normalize(0,255)):CImg<ucharT>(img2d);
              if (res._spectrum>3) res.channels(0,2);
              const unsigned int h = CImgDisplay::_fitscreen(res._width,res._height,1,256,-85,true);
              res.resize(x - x0,cimg::max(32U,h*disp._height/max_height),1,res._spectrum==1?3:-100);
              positions(ind,0) = positions(ind,2) = (int)x0;
              positions(ind,1) = positions(ind,3) = (int)(align*(visu0.height()-res.height()));
              positions(ind,2)+=res._width;
              positions(ind,3)+=res._height - 1;
              visu0.draw_image(positions(ind,0),positions(ind,1),res);
            } else for (unsigned int y = 0; y<visu0._height; ) {
              const unsigned int y0 = y;
              ind = indices[y];
              while (y<visu0._height && indices[++y]==ind) {}
              const CImg<T>
                &src = _data[ind],
                _img2d = src._depth>1?src.get_projections2d(src._width/2,src._height/2,src._depth/2):CImg<T>(),
                &img2d = _img2d?_img2d:src;
              CImg<ucharT> res = old_normalization==1?CImg<ucharT>(img2d.get_normalize(0,255)):CImg<ucharT>(img2d);
              if (res._spectrum>3) res.channels(0,2);
              const unsigned int w = CImgDisplay::_fitscreen(res._width,res._height,1,256,-85,false);
              res.resize(cimg::max(32U,w*disp._width/max_width),y - y0,1,res._spectrum==1?3:-100);
              positions(ind,0) = positions(ind,2) = (int)(align*(visu0.width()-res.width()));
              positions(ind,1) = positions(ind,3) = (int)y0;
              positions(ind,2)+=res._width - 1;
              positions(ind,3)+=res._height;
              visu0.draw_image(positions(ind,0),positions(ind,1),res);
            }
          if (axis=='x') --positions(ind,2); else --positions(ind,3);
          update_display = true;
        }

        if (!visu || oindice0!=indice0 || oindice1!=indice1) {
          if (indice0>=0 && indice1>=0) {
            visu.assign(visu0,false);
            const int indm = cimg::min(indice0,indice1), indM = cimg::max(indice0,indice1);
            for (int ind = indm; ind<=indM; ++ind) if (positions(ind,0)>=0) {
                visu.draw_rectangle(positions(ind,0),positions(ind,1),positions(ind,2),positions(ind,3),background_color,0.2f);
                if ((axis=='x' && positions(ind,2) - positions(ind,0)>=8) ||
                    (axis!='x' && positions(ind,3) - positions(ind,1)>=8))
                  visu.draw_rectangle(positions(ind,0),positions(ind,1),positions(ind,2),positions(ind,3),foreground_color,0.9f,0x55555555);
              }
            const int yt = (int)text_down?visu.height()-13:0;
            if (is_clicked) visu.draw_text(0,yt," Images %u - %u, Size = %u",foreground_color,background_color,0.7f,13,
                                           orig + indm,orig + indM,indM - indm + 1);
            else visu.draw_text(0,yt," Image %u",foreground_color,background_color,0.7f,13,
                                orig + indice0);
            update_display = true;
          } else visu.assign();
        }
        if (!visu) { visu.assign(visu0,true); update_display = true; }
        if (update_display) { visu.display(disp); update_display = false; }
        disp.wait();

        // Manage user events.
        const int xm = disp.mouse_x(), ym = disp.mouse_y();
        int indice = -1;

        if (xm>=0) {
          indice = (int)indices(axis=='x'?xm:ym);
          if (disp.button()&1) {
            if (!is_clicked) { is_clicked = true; oindice0 = indice0; indice0 = indice; }
            oindice1 = indice1; indice1 = indice;
            if (!feature_type) is_selected = true;
          } else {
            if (!is_clicked) { oindice0 = oindice1 = indice0; indice0 = indice1 = indice; }
            else is_selected = true;
          }
        } else {
          if (is_clicked) {
            if (!(disp.button()&1)) { is_clicked = is_selected = false; indice0 = indice1 = -1; }
            else indice1 = -1;
          } else indice0 = indice1 = -1;
        }

        if (disp.button()&4) { is_clicked = is_selected = false; indice0 = indice1 = -1; }
        if (disp.button()&2 && exit_on_rightbutton) { is_selected = true; indice1 = indice0 = -1; }
        if (disp.wheel() && exit_on_wheel) is_selected = true;

        switch (key = disp.key()) {
#if cimg_OS!=2
        case cimg::keyCTRLRIGHT :
#endif
        case 0 : case cimg::keyCTRLLEFT : key = 0; break;
        case cimg::keyD : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            disp.set_fullscreen(false).resize(CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,false),
                                              CImgDisplay::_fitscreen(3*disp.width()/2,3*disp.height()/2,1,128,-100,true),false).
              _is_resized = true;
            disp.set_key(key,false); key = 0; visu0.assign();
          } break;
        case cimg::keyC : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            disp.set_fullscreen(false).resize(cimg_fitscreen(2*disp.width()/3,2*disp.height()/3,1),false)._is_resized = true;
            disp.set_key(key,false); key = 0; visu0.assign();
          } break;
        case cimg::keyR : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            disp.set_fullscreen(false).resize(cimg_fitscreen(axis=='x'?sum_width:max_width,axis=='x'?max_height:sum_height,1),false)._is_resized = true;
            disp.set_key(key,false); key = 0; visu0.assign();
          } break;
        case cimg::keyF : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            disp.resize(disp.screen_width(),disp.screen_height(),false).toggle_fullscreen()._is_resized = true;
            disp.set_key(key,false); key = 0; visu0.assign();
          } break;
        case cimg::keyS : if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            static unsigned int snap_number = 0;
            char filename[32] = { 0 };
            std::FILE *file;
            do {
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.bmp",snap_number++);
              if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
            } while (file);
            if (visu0) {
              visu.draw_text(0,0," Saving snapshot... ",foreground_color,background_color,1,13).display(disp);
              visu0.save(filename);
              visu.draw_text(0,0," Snapshot '%s' saved. ",foreground_color,background_color,1,13,filename).display(disp);
            }
            disp.set_key(key,false).wait(); key = 0;
          } break;
        case cimg::keyO :
          if (disp.is_keyCTRLLEFT() || disp.is_keyCTRLRIGHT()) {
            static unsigned int snap_number = 0;
            char filename[32] = { 0 };
            std::FILE *file;
            do {
#ifdef cimg_use_zlib
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.cimgz",snap_number++);
#else
              cimg_snprintf(filename,sizeof(filename),"CImg_%.4u.cimg",snap_number++);
#endif
              if ((file=std::fopen(filename,"r"))!=0) cimg::fclose(file);
            } while (file);
            visu.draw_text(0,0," Saving instance... ",foreground_color,background_color,1,13).display(disp);
            save(filename);
            visu.draw_text(0,0," Instance '%s' saved. ",foreground_color,background_color,1,13,filename).display(disp);
            disp.set_key(key,false).wait(); key = 0;
          } break;
        }
        if (disp.is_resized()) { disp.resize(false); visu0.assign(); }
        if (ym>=0 && ym<13) { if (!text_down) { visu.assign(); text_down = true; }}
        else if (ym>=visu.height()-13) { if(text_down) { visu.assign(); text_down = false; }}
      }
      CImg<intT> res(1,2,1,1,-1);
      if (is_selected) { if (feature_type) res.fill(cimg::min(indice0,indice1),cimg::max(indice0,indice1)); else res.fill(indice0); }
      if (!(disp.button()&2)) disp.set_button();
      disp._normalization = old_normalization;
      disp._is_resized = old_is_resized;
      disp.set_key(key);
      return res;
    }

    //! Load an image list from a file.
    CImgList<T>& load(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimglist_instance
                                    "load() : Specified filename is (null).",
                                    cimglist_instance);

      const char *const ext = cimg::split_filename(filename);
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      try {
#ifdef cimglist_load_plugin
        cimglist_load_plugin(filename);
#endif
#ifdef cimglist_load_plugin1
        cimglist_load_plugin1(filename);
#endif
#ifdef cimglist_load_plugin2
        cimglist_load_plugin2(filename);
#endif
#ifdef cimglist_load_plugin3
        cimglist_load_plugin3(filename);
#endif
#ifdef cimglist_load_plugin4
        cimglist_load_plugin4(filename);
#endif
#ifdef cimglist_load_plugin5
        cimglist_load_plugin5(filename);
#endif
#ifdef cimglist_load_plugin6
        cimglist_load_plugin6(filename);
#endif
#ifdef cimglist_load_plugin7
        cimglist_load_plugin7(filename);
#endif
#ifdef cimglist_load_plugin8
        cimglist_load_plugin8(filename);
#endif
        if (!cimg::strcasecmp(ext,"tif") ||
            !cimg::strcasecmp(ext,"tiff")) load_tiff(filename);
        else if (!cimg::strcasecmp(ext,"cimg") ||
                 !cimg::strcasecmp(ext,"cimgz") ||
                 !*ext) load_cimg(filename);
        else if (!cimg::strcasecmp(ext,"rec") ||
                 !cimg::strcasecmp(ext,"par")) load_parrec(filename);
        else if (!cimg::strcasecmp(ext,"avi") ||
                 !cimg::strcasecmp(ext,"mov") ||
                 !cimg::strcasecmp(ext,"asf") ||
                 !cimg::strcasecmp(ext,"divx") ||
                 !cimg::strcasecmp(ext,"flv") ||
                 !cimg::strcasecmp(ext,"mpg") ||
                 !cimg::strcasecmp(ext,"m1v") ||
                 !cimg::strcasecmp(ext,"m2v") ||
                 !cimg::strcasecmp(ext,"m4v") ||
                 !cimg::strcasecmp(ext,"mjp") ||
                 !cimg::strcasecmp(ext,"mkv") ||
                 !cimg::strcasecmp(ext,"mpe") ||
                 !cimg::strcasecmp(ext,"movie") ||
                 !cimg::strcasecmp(ext,"ogm") ||
                 !cimg::strcasecmp(ext,"ogg") ||
                 !cimg::strcasecmp(ext,"qt") ||
                 !cimg::strcasecmp(ext,"rm") ||
                 !cimg::strcasecmp(ext,"vob") ||
                 !cimg::strcasecmp(ext,"wmv") ||
                 !cimg::strcasecmp(ext,"xvid") ||
                 !cimg::strcasecmp(ext,"mpeg")) load_ffmpeg(filename);
        else if (!cimg::strcasecmp(ext,"gz")) load_gzip_external(filename);
        else throw CImgIOException("CImgList<%s>::load()",
                                   pixel_type());
      } catch (CImgIOException& e) {
        if (!cimg::strncasecmp(e.what(),"cimg::fopen()",13)) {
          cimg::exception_mode() = omode;
          throw CImgIOException(_cimglist_instance
                                "load() : Failed to open file '%s'.",
                                cimglist_instance,
                                filename);
        } else try {
          assign(1);
          _data->load(filename);
        } catch (CImgException&) {
          throw CImgIOException(_cimglist_instance
                                "load() : Failed to recognize format of file '%s'.",
                                cimglist_instance,
                                filename);
        }
      }
      cimg::exception_mode() = omode;
      return *this;
    }

    static CImgList<T> get_load(const char *const filename) {
      return CImgList<T>().load(filename);
    }

    //! Load an image list from a .cimg file.
    CImgList<T>& load_cimg(const char *const filename) {
      return _load_cimg(0,filename);
    }

    static CImgList<T> get_load_cimg(const char *const filename) {
      return CImgList<T>().load_cimg(filename);
    }

    //! Load an image list from a .cimg file.
    CImgList<T>& load_cimg(std::FILE *const file) {
      return _load_cimg(file,0);
    }

    static CImgList<T> get_load_cimg(std::FILE *const file) {
      return CImgList<T>().load_cimg(file);
    }

    CImgList<T>& _load_cimg(std::FILE *const file, const char *const filename) {
#ifdef cimg_use_zlib
#define _cimgz_load_cimg_case(Tss) { \
   Bytef *const cbuf = new Bytef[csiz]; \
   cimg::fread(cbuf,csiz,nfile); \
   raw.assign(W,H,D,C); \
   unsigned long destlen = (unsigned long)raw.size()*sizeof(T); \
   uncompress((Bytef*)raw._data,&destlen,cbuf,csiz); \
   delete[] cbuf; \
   const Tss *ptrs = raw._data; \
   for (unsigned int off = raw.size(); off; --off) *(ptrd++) = (T)*(ptrs++); \
}
#else
#define _cimgz_load_cimg_case(Tss) \
   throw CImgIOException(_cimglist_instance \
                         "load_cimg() : Unable to load compressed data from file '%s' unless zlib is enabled.", \
                         cimglist_instance, \
                         filename?filename:"(FILE*)");
#endif

#define _cimg_load_cimg_case(Ts,Tss) \
      if (!loaded && !cimg::strcasecmp(Ts,str_pixeltype)) { \
        for (unsigned int l = 0; l<N; ++l) { \
          j = 0; while ((i=std::fgetc(nfile))!='\n' && i>=0) tmp[j++] = (char)i; tmp[j] = 0; \
          W = H = D = C = 0; csiz = 0; \
          if ((err = std::sscanf(tmp,"%u %u %u %u #%u",&W,&H,&D,&C,&csiz))<4) \
            throw CImgIOException(_cimglist_instance \
                                  "load_cimg() : Invalid specified size (%u,%u,%u,%u) of image %u in file '%s'", \
                                  cimglist_instance, \
                                  W,H,D,C,l,filename?filename:("(FILE*)")); \
          if (W*H*D*C>0) { \
            CImg<Tss> raw; \
            CImg<T> &img = _data[l]; \
            img.assign(W,H,D,C); \
            T *ptrd = img._data; \
            if (err==5) _cimgz_load_cimg_case(Tss) \
            else for (int toread = (int)img.size(); toread>0; ) { \
              raw.assign(cimg::min(toread,cimg_iobuffer)); \
              cimg::fread(raw._data,raw._width,nfile); \
              if (endian!=cimg::endianness()) cimg::invert_endianness(raw._data,raw._width); \
              toread-=raw._width; \
              const Tss *ptrs = raw._data; \
              for (unsigned int off = raw._width; off; --off) *(ptrd++) = (T)*(ptrs++); \
            } \
          } \
        } \
        loaded = true; \
      }

      if (!filename && !file)
        throw CImgArgumentException(_cimglist_instance
                                    "load_cimg() : Specified filename is (null).",
                                    cimglist_instance);

      const int cimg_iobuffer = 12*1024*1024;
      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      bool loaded = false, endian = cimg::endianness();
      char tmp[256] = { 0 }, str_pixeltype[256] = { 0 }, str_endian[256] = { 0 };
      unsigned int j, err, N = 0, W, H, D, C, csiz;
      int i;
      do {
        j = 0; while ((i=std::fgetc(nfile))!='\n' && i!=EOF && j<256) tmp[j++] = (char)i; tmp[j] = 0;
      } while (*tmp=='#' && i!=EOF);
      err = std::sscanf(tmp,"%u%*c%255[A-Za-z_]%*c%255[sA-Za-z_ ]",&N,str_pixeltype,str_endian);
      if (err<2) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimglist_instance
                              "load_cimg() : CImg header not found in file '%s'.",
                              cimglist_instance,
                              filename?filename:"(FILE*)");
      }
      if (!cimg::strncasecmp("little",str_endian,6)) endian = false;
      else if (!cimg::strncasecmp("big",str_endian,3)) endian = true;
      assign(N);
      _cimg_load_cimg_case("bool",bool);
      _cimg_load_cimg_case("unsigned_char",unsigned char);
      _cimg_load_cimg_case("uchar",unsigned char);
      _cimg_load_cimg_case("char",char);
      _cimg_load_cimg_case("unsigned_short",unsigned short);
      _cimg_load_cimg_case("ushort",unsigned short);
      _cimg_load_cimg_case("short",short);
      _cimg_load_cimg_case("unsigned_int",unsigned int);
      _cimg_load_cimg_case("uint",unsigned int);
      _cimg_load_cimg_case("int",int);
      _cimg_load_cimg_case("unsigned_long",unsigned long);
      _cimg_load_cimg_case("ulong",unsigned long);
      _cimg_load_cimg_case("long",long);
      _cimg_load_cimg_case("float",float);
      _cimg_load_cimg_case("double",double);
      if (!loaded) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimglist_instance
                              "load_cimg() : Unsupported pixel type '%s' for file '%s'.",
                              cimglist_instance,
                              str_pixeltype,filename?filename:"(FILE*)");
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load a sub-image list from a non compressed .cimg file.
    CImgList<T>& load_cimg(const char *const filename,
                           const unsigned int n0, const unsigned int n1,
                           const unsigned int x0, const unsigned int y0, const unsigned int z0, const unsigned int c0,
                           const unsigned int x1, const unsigned int y1, const unsigned int z1, const unsigned int c1) {
      return _load_cimg(0,filename,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
    }

    static CImgList<T> get_load_cimg(const char *const filename,
                                     const unsigned int n0, const unsigned int n1,
                                     const unsigned int x0, const unsigned int y0, const unsigned int z0, const unsigned int c0,
                                     const unsigned int x1, const unsigned int y1, const unsigned int z1, const unsigned int c1) {
      return CImgList<T>().load_cimg(filename,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
    }

    //! Load a sub-image list from a non compressed .cimg file.
    CImgList<T>& load_cimg(std::FILE *const file,
                           const unsigned int n0, const unsigned int n1,
                           const unsigned int x0, const unsigned int y0, const unsigned int z0, const unsigned int c0,
                           const unsigned int x1, const unsigned int y1, const unsigned int z1, const unsigned int c1) {
      return _load_cimg(file,0,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
    }

    static CImgList<T> get_load_cimg(std::FILE *const file,
                                     const unsigned int n0, const unsigned int n1,
                                     const unsigned int x0, const unsigned int y0, const unsigned int z0, const unsigned int c0,
                                     const unsigned int x1, const unsigned int y1, const unsigned int z1, const unsigned int c1) {
      return CImgList<T>().load_cimg(file,n0,n1,x0,y0,z0,c0,x1,y1,z1,c1);
    }

    CImgList<T>& _load_cimg(std::FILE *const file, const char *const filename,
                            const unsigned int n0, const unsigned int n1,
                            const unsigned int x0, const unsigned int y0, const unsigned int z0, const unsigned int c0,
                            const unsigned int x1, const unsigned int y1, const unsigned int z1, const unsigned int c1) {
#define _cimg_load_cimg_case2(Ts,Tss) \
      if (!loaded && !cimg::strcasecmp(Ts,str_pixeltype)) { \
        for (unsigned int l = 0; l<=nn1; ++l) { \
          j = 0; while ((i=std::fgetc(nfile))!='\n' && i>=0) tmp[j++] = (char)i; tmp[j] = 0; \
          W = H = D = C = 0; \
          if (std::sscanf(tmp,"%u %u %u %u",&W,&H,&D,&C)!=4) \
            throw CImgIOException(_cimglist_instance \
                                  "load_cimg() : Invalid specified size (%u,%u,%u,%u) of image %u in file '%s'", \
                                  cimglist_instance, \
                                  W,H,D,C,l,filename?filename:"(FILE*)"); \
          if (W*H*D*C>0) { \
            if (l<n0 || x0>=W || y0>=H || z0>=D || c0>=D) std::fseek(nfile,W*H*D*C*sizeof(Tss),SEEK_CUR); \
            else { \
              const unsigned int \
                nx1 = x1>=W?W-1:x1, \
                ny1 = y1>=H?H-1:y1, \
                nz1 = z1>=D?D-1:z1, \
                nc1 = c1>=C?C-1:c1; \
              CImg<Tss> raw(1 + nx1 - x0); \
              CImg<T> &img = _data[l - n0]; \
              img.assign(1 + nx1 - x0,1 + ny1 - y0,1 + nz1 - z0,1 + nc1 - c0); \
              T *ptrd = img._data; \
              const unsigned int skipvb = c0*W*H*D*sizeof(Tss); \
              if (skipvb) std::fseek(nfile,skipvb,SEEK_CUR); \
              for (unsigned int v = 1 + nc1 - c0; v; --v) { \
                const unsigned int skipzb = z0*W*H*sizeof(Tss); \
                if (skipzb) std::fseek(nfile,skipzb,SEEK_CUR); \
                for (unsigned int z = 1 + nz1 - z0; z; --z) { \
                  const unsigned int skipyb = y0*W*sizeof(Tss); \
                  if (skipyb) std::fseek(nfile,skipyb,SEEK_CUR); \
                  for (unsigned int y = 1 + ny1 - y0; y; --y) { \
                    const unsigned int skipxb = x0*sizeof(Tss); \
                    if (skipxb) std::fseek(nfile,skipxb,SEEK_CUR); \
                    cimg::fread(raw._data,raw._width,nfile); \
                    if (endian!=cimg::endianness()) cimg::invert_endianness(raw._data,raw._width); \
                    const Tss *ptrs = raw._data; \
                    for (unsigned int off = raw._width; off; --off) *(ptrd++) = (T)*(ptrs++); \
                    const unsigned int skipxe = (W-1-nx1)*sizeof(Tss); \
                    if (skipxe) std::fseek(nfile,skipxe,SEEK_CUR); \
                  } \
                  const unsigned int skipye = (H-1-ny1)*W*sizeof(Tss); \
                  if (skipye) std::fseek(nfile,skipye,SEEK_CUR); \
                } \
                const unsigned int skipze = (D-1-nz1)*W*H*sizeof(Tss); \
                if (skipze) std::fseek(nfile,skipze,SEEK_CUR); \
              } \
              const unsigned int skipve = (C-1-nc1)*W*H*D*sizeof(Tss); \
              if (skipve) std::fseek(nfile,skipve,SEEK_CUR); \
            } \
          } \
        } \
        loaded = true; \
      }

      if (!filename && !file)
        throw CImgArgumentException(_cimglist_instance
                                    "load_cimg() : Specified filename is (null).",
                                    cimglist_instance);

      if (n1<n0 || x1<x0 || y1<y0 || z1<z0 || c1<c0)
        throw CImgArgumentException(_cimglist_instance
                                    "load_cimg() : Invalid specified sub-region coordinates [%u->%u] (%u,%u,%u,%u)->(%u,%u,%u,%u) for file '%s'.",
                                    cimglist_instance,
                                    n0,n1,x0,y0,z0,c0,x1,y1,z1,filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      bool loaded = false, endian = cimg::endianness();
      char tmp[256] = { 0 }, str_pixeltype[256] = { 0 }, str_endian[256] = { 0 };
      unsigned int j, err, N, W, H, D, C;
      int i;
      j = 0; while((i=std::fgetc(nfile))!='\n' && i!=EOF && j<256) tmp[j++] = (char)i; tmp[j] = 0;
      err = std::sscanf(tmp,"%u%*c%255[A-Za-z_]%*c%255[sA-Za-z_ ]",&N,str_pixeltype,str_endian);
      if (err<2) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimglist_instance
                              "load_cimg() : CImg header not found in file '%s'.",
                              cimglist_instance,
                              filename?filename:"(FILE*)");
      }
      if (!cimg::strncasecmp("little",str_endian,6)) endian = false;
      else if (!cimg::strncasecmp("big",str_endian,3)) endian = true;
      const unsigned int nn1 = n1>=N?N-1:n1;
      assign(1+nn1-n0);
      _cimg_load_cimg_case2("bool",bool);
      _cimg_load_cimg_case2("unsigned_char",unsigned char);
      _cimg_load_cimg_case2("uchar",unsigned char);
      _cimg_load_cimg_case2("char",char);
      _cimg_load_cimg_case2("unsigned_short",unsigned short);
      _cimg_load_cimg_case2("ushort",unsigned short);
      _cimg_load_cimg_case2("short",short);
      _cimg_load_cimg_case2("unsigned_int",unsigned int);
      _cimg_load_cimg_case2("uint",unsigned int);
      _cimg_load_cimg_case2("int",int);
      _cimg_load_cimg_case2("unsigned_long",unsigned long);
      _cimg_load_cimg_case2("ulong",unsigned long);
      _cimg_load_cimg_case2("long",long);
      _cimg_load_cimg_case2("float",float);
      _cimg_load_cimg_case2("double",double);
      if (!loaded) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimglist_instance
                              "load_cimg() : Unsupported pixel type '%s' for file '%s'.",
                              cimglist_instance,
                              str_pixeltype,filename?filename:"(FILE*)");
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image list from a PAR/REC (Philips) file.
    CImgList<T>& load_parrec(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimglist_instance
                                    "load_parrec() : Specified filename is (null).",
                                    cimglist_instance);

      char body[1024] = { 0 }, filenamepar[1024] = { 0 }, filenamerec[1024] = { 0 };
      const char *const ext = cimg::split_filename(filename,body);
      if (!std::strcmp(ext,"par")) { std::strncpy(filenamepar,filename,sizeof(filenamepar)-1); cimg_snprintf(filenamerec,sizeof(filenamerec),"%s.rec",body); }
      if (!std::strcmp(ext,"PAR")) { std::strncpy(filenamepar,filename,sizeof(filenamepar)-1); cimg_snprintf(filenamerec,sizeof(filenamerec),"%s.REC",body); }
      if (!std::strcmp(ext,"rec")) { std::strncpy(filenamerec,filename,sizeof(filenamerec)-1); cimg_snprintf(filenamepar,sizeof(filenamepar),"%s.par",body); }
      if (!std::strcmp(ext,"REC")) { std::strncpy(filenamerec,filename,sizeof(filenamerec)-1); cimg_snprintf(filenamepar,sizeof(filenamepar),"%s.PAR",body); }
      std::FILE *file = cimg::fopen(filenamepar,"r");

      // Parse header file
      CImgList<floatT> st_slices;
      CImgList<uintT> st_global;
      int err;
      char line[256] = { 0 };
      do { err=std::fscanf(file,"%255[^\n]%*c",line); } while (err!=EOF && (*line=='#' || *line=='.'));
      do {
        unsigned int sn,sizex,sizey,pixsize;
        float rs,ri,ss;
        err = std::fscanf(file,"%u%*u%*u%*u%*u%*u%*u%u%*u%u%u%g%g%g%*[^\n]",&sn,&pixsize,&sizex,&sizey,&ri,&rs,&ss);
        if (err==7) {
          CImg<floatT>::vector((float)sn,(float)pixsize,(float)sizex,(float)sizey,ri,rs,ss,0).move_to(st_slices);
          unsigned int i; for (i = 0; i<st_global._width && sn<=st_global[i][2]; ++i) {}
          if (i==st_global._width) CImg<uintT>::vector(sizex,sizey,sn).move_to(st_global);
          else {
            CImg<uintT> &vec = st_global[i];
            if (sizex>vec[0]) vec[0] = sizex;
            if (sizey>vec[1]) vec[1] = sizey;
            vec[2] = sn;
          }
          st_slices[st_slices._width-1][7] = (float)i;
        }
      } while (err==7);

      // Read data
      std::FILE *file2 = cimg::fopen(filenamerec,"rb");
      cimglist_for(st_global,l) {
        const CImg<uintT>& vec = st_global[l];
        CImg<T>(vec[0],vec[1],vec[2]).move_to(*this);
      }

      cimglist_for(st_slices,l) {
        const CImg<floatT>& vec = st_slices[l];
        const unsigned int
          sn = (unsigned int)vec[0] - 1,
          pixsize = (unsigned int)vec[1],
          sizex = (unsigned int)vec[2],
          sizey = (unsigned int)vec[3],
          imn = (unsigned int)vec[7];
        const float ri = vec[4], rs = vec[5], ss = vec[6];
        switch (pixsize) {
        case 8 : {
          CImg<ucharT> buf(sizex,sizey);
          cimg::fread(buf._data,sizex*sizey,file2);
          if (cimg::endianness()) cimg::invert_endianness(buf._data,sizex*sizey);
          CImg<T>& img = (*this)[imn];
          cimg_forXY(img,x,y) img(x,y,sn) = (T)(( buf(x,y)*rs + ri )/(rs*ss));
        } break;
        case 16 : {
          CImg<ushortT> buf(sizex,sizey);
          cimg::fread(buf._data,sizex*sizey,file2);
          if (cimg::endianness()) cimg::invert_endianness(buf._data,sizex*sizey);
          CImg<T>& img = (*this)[imn];
          cimg_forXY(img,x,y) img(x,y,sn) = (T)(( buf(x,y)*rs + ri )/(rs*ss));
        } break;
        case 32 : {
          CImg<uintT> buf(sizex,sizey);
          cimg::fread(buf._data,sizex*sizey,file2);
          if (cimg::endianness()) cimg::invert_endianness(buf._data,sizex*sizey);
          CImg<T>& img = (*this)[imn];
          cimg_forXY(img,x,y) img(x,y,sn) = (T)(( buf(x,y)*rs + ri )/(rs*ss));
        } break;
        default :
          cimg::fclose(file);
          cimg::fclose(file2);
          throw CImgIOException(_cimglist_instance
                                "load_parrec() : Unsupported %d-bits pixel type for file '%s'.",
                                cimglist_instance,
                                pixsize,filename);
        }
      }
      cimg::fclose(file);
      cimg::fclose(file2);
      if (!_width)
        throw CImgIOException(_cimglist_instance
                              "load_parrec() : Failed to recognize valid PAR-REC data in file '%s'.",
                              cimglist_instance,
                              filename);
      return *this;
    }

    static CImgList<T> get_load_parrec(const char *const filename) {
      return CImgList<T>().load_parrec(filename);
    }

    //! Load an image sequence from a YUV file.
    CImgList<T>& load_yuv(const char *const filename,
                          const unsigned int sizex, const unsigned int sizey,
                          const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                          const unsigned int step_frame=1, const bool yuv2rgb=true) {
      return _load_yuv(0,filename,sizex,sizey,first_frame,last_frame,step_frame,yuv2rgb);
    }

    static CImgList<T> get_load_yuv(const char *const filename,
                                    const unsigned int sizex, const unsigned int sizey=1,
                                    const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                    const unsigned int step_frame=1, const bool yuv2rgb=true) {
      return CImgList<T>().load_yuv(filename,sizex,sizey,first_frame,last_frame,step_frame,yuv2rgb);
    }

    //! Load an image sequence from a YUV file.
    CImgList<T>& load_yuv(std::FILE *const file,
                          const unsigned int sizex, const unsigned int sizey,
                          const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                          const unsigned int step_frame=1, const bool yuv2rgb=true) {
      return _load_yuv(file,0,sizex,sizey,first_frame,last_frame,step_frame,yuv2rgb);
    }

    static CImgList<T> get_load_yuv(std::FILE *const file,
                                    const unsigned int sizex, const unsigned int sizey=1,
                                    const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                    const unsigned int step_frame=1, const bool yuv2rgb=true) {
      return CImgList<T>().load_yuv(file,sizex,sizey,first_frame,last_frame,step_frame,yuv2rgb);
    }

    CImgList<T>& _load_yuv(std::FILE *const file, const char *const filename,
                           const unsigned int sizex, const unsigned int sizey,
                           const unsigned int first_frame, const unsigned int last_frame,
                           const unsigned int step_frame, const bool yuv2rgb) {
      if (!filename && !file)
        throw CImgArgumentException(_cimglist_instance
                                    "load_yuv() : Specified filename is (null).",
                                    cimglist_instance);
      if (sizex%2 || sizey%2)
        throw CImgArgumentException(_cimglist_instance
                                    "load_yuv() : Invalid odd XY dimensions %ux%u in file '%s'.",
                                    cimglist_instance,
                                    sizex,sizey,filename?filename:"(FILE*)");
      if (!sizex || !sizey)
        throw CImgArgumentException(_cimglist_instance
                                    "load_yuv() : Invalid sequence size (%u,%u) in file '%s'.",
                                    cimglist_instance,
                                    sizex,sizey,filename?filename:"(FILE*)");

      const unsigned int
        nfirst_frame = first_frame<last_frame?first_frame:last_frame,
        nlast_frame = first_frame<last_frame?last_frame:first_frame,
        nstep_frame = step_frame?step_frame:1;

      CImg<ucharT> tmp(sizex,sizey,1,3), UV(sizex/2,sizey/2,1,2);
      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb");
      bool stopflag = false;
      int err;
      if (nfirst_frame) {
        err = std::fseek(nfile,nfirst_frame*(sizex*sizey + sizex*sizey/2),SEEK_CUR);
        if (err) {
          if (!file) cimg::fclose(nfile);
          throw CImgIOException(_cimglist_instance
                                "load_yuv() : File '%s' doesn't contain frame number %u.",
                                cimglist_instance,
                                filename?filename:"(FILE*)",nfirst_frame);
        }
      }
      unsigned int frame;
      for (frame = nfirst_frame; !stopflag && frame<=nlast_frame; frame+=nstep_frame) {
        tmp.fill(0);
        // *TRY* to read the luminance part, do not replace by cimg::fread !
        err = (int)std::fread((void*)(tmp._data),1,(size_t)(tmp._width*tmp._height),nfile);
        if (err!=(int)(tmp._width*tmp._height)) {
          stopflag = true;
          if (err>0)
            cimg::warn(_cimglist_instance
                       "load_yuv() : File '%s' contains incomplete data or given image dimensions (%u,%u) are incorrect.",
                       cimglist_instance,
                       filename?filename:"(FILE*)",sizex,sizey);
        } else {
          UV.fill(0);
          // *TRY* to read the luminance part, do not replace by cimg::fread !
          err = (int)std::fread((void*)(UV._data),1,(size_t)(UV.size()),nfile);
          if (err!=(int)(UV.size())) {
            stopflag = true;
            if (err>0)
              cimg::warn(_cimglist_instance
                         "load_yuv() : File '%s' contains incomplete data or given image dimensions (%u,%u) are incorrect.",
                         cimglist_instance,
                         filename?filename:"(FILE*)",sizex,sizey);
          } else {
            cimg_forXY(UV,x,y) {
              const int x2 = x*2, y2 = y*2;
              tmp(x2,y2,1) = tmp(x2+1,y2,1) = tmp(x2,y2+1,1) = tmp(x2+1,y2+1,1) = UV(x,y,0);
              tmp(x2,y2,2) = tmp(x2+1,y2,2) = tmp(x2,y2+1,2) = tmp(x2+1,y2+1,2) = UV(x,y,1);
            }
            if (yuv2rgb) tmp.YCbCrtoRGB();
            insert(tmp);
            if (nstep_frame>1) std::fseek(nfile,(nstep_frame-1)*(sizex*sizey + sizex*sizey/2),SEEK_CUR);
          }
        }
      }
      if (stopflag && nlast_frame!=~0U && frame!=nlast_frame)
        cimg::warn(_cimglist_instance
                   "load_yuv() : Frame %d not reached since only %u frames were found in file '%s'.",
                   cimglist_instance,
                   nlast_frame,frame-1,filename?filename:"(FILE*)");

      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Load an image from a video file, using ffmpeg libraries.
    // This piece of code has been firstly created by David Starweather (starkdg(at)users(dot)sourceforge(dot)net)
    // I modified it afterwards for direct inclusion in the library core.
    CImgList<T>& load_ffmpeg(const char *const filename, const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                             const unsigned int step_frame=1, const bool pixel_format=true, const bool resume=false) {
      if (!filename)
        throw CImgArgumentException(_cimglist_instance
                                    "load_ffmpeg() : Specified filename is (null).",
                                    cimglist_instance);

      const unsigned int
        nfirst_frame = first_frame<last_frame?first_frame:last_frame,
        nlast_frame = first_frame<last_frame?last_frame:first_frame,
        nstep_frame = step_frame?step_frame:1;
      assign();

#ifndef cimg_use_ffmpeg
      if ((nfirst_frame || nlast_frame!=~0U || nstep_frame>1) || (resume && (pixel_format || !pixel_format)))
        throw CImgArgumentException(_cimglist_instance
                                    "load_ffmpeg() : Unable to load sub-frames from file '%s' unless libffmpeg is enabled.",
                                    cimglist_instance,
                                    filename);

      return load_ffmpeg_external(filename);
#else
      const PixelFormat ffmpeg_pixfmt = pixel_format?PIX_FMT_RGB24:PIX_FMT_GRAY8;
      avcodec_register_all();
      av_register_all();
      static AVFormatContext *format_ctx = 0;
      static AVCodecContext *codec_ctx = 0;
      static AVCodec *codec = 0;
      static AVFrame *avframe = avcodec_alloc_frame(), *converted_frame = avcodec_alloc_frame();
      static int vstream = 0;

      if (resume) {
        if (!format_ctx || !codec_ctx || !codec || !avframe || !converted_frame)
          throw CImgArgumentException(_cimglist_instance
                                      "load_ffmpeg() : Failed to resume loading of file '%s', due to unallocated FFMPEG structures.",
                                      cimglist_instance,
                                      filename);
      } else {
        // Open video file, find main video stream and codec.
        if (format_ctx) av_close_input_file(format_ctx);
        if (av_open_input_file(&format_ctx,filename,0,0,0)!=0)
          throw CImgIOException(_cimglist_instance
                                "load_ffmpeg() : Failed to open file '%s'.",
                                cimglist_instance,
                                filename);

        if (!avframe || !converted_frame || av_find_stream_info(format_ctx)<0) {
          av_close_input_file(format_ctx); format_ctx = 0;
          return load_ffmpeg_external(filename);
        }
#if cimg_verbosity>=3
        dump_format(format_ctx,0,0,0);
#endif

        // Special command : Return informations on main video stream.
        // as a vector 1x4 containing : (nb_frames,width,height,fps).
        if (!first_frame && !last_frame && !step_frame) {
          for (vstream = 0; vstream<(int)(format_ctx->nb_streams); ++vstream)
            if (format_ctx->streams[vstream]->codec->codec_type==CODEC_TYPE_VIDEO) break;
          if (vstream==(int)format_ctx->nb_streams) assign();
          else {
            CImgList<doubleT> timestamps;
            int nb_frames;
            AVPacket packet;
            // Count frames and store timestamps.
            for (nb_frames = 0; av_read_frame(format_ctx,&packet)>=0; av_free_packet(&packet))
              if (packet.stream_index==vstream) {
                CImg<doubleT>::vector((double)packet.pts).move_to(timestamps);
                ++nb_frames;
              }
            // Get frame with, height and fps.
            const int
              framew = format_ctx->streams[vstream]->codec->width,
              frameh = format_ctx->streams[vstream]->codec->height;
            const float
              num = (float)(format_ctx->streams[vstream]->r_frame_rate).num,
              den = (float)(format_ctx->streams[vstream]->r_frame_rate).den,
              fps = num/den;
            // Return infos as a list.
            assign(2);
            (*this)[0].assign(1,4).fill((T)nb_frames,(T)framew,(T)frameh,(T)fps);
            (*this)[1] = (timestamps>'y');
          }
          av_close_input_file(format_ctx); format_ctx = 0;
          return *this;
        }

        for (vstream = 0; vstream<(int)(format_ctx->nb_streams) &&
               format_ctx->streams[vstream]->codec->codec_type!=CODEC_TYPE_VIDEO; ) ++vstream;
        if (vstream==(int)format_ctx->nb_streams) {
          av_close_input_file(format_ctx); format_ctx = 0;
          return load_ffmpeg_external(filename);
        }
        codec_ctx = format_ctx->streams[vstream]->codec;
        codec = avcodec_find_decoder(codec_ctx->codec_id);
        if (!codec) {
          return load_ffmpeg_external(filename);
        }
        if (avcodec_open(codec_ctx,codec)<0) { // Open codec
          return load_ffmpeg_external(filename);
        }
      }

      // Read video frames
      const unsigned int numBytes = avpicture_get_size(ffmpeg_pixfmt,codec_ctx->width,codec_ctx->height);
      uint8_t *const buffer = new uint8_t[numBytes];
      avpicture_fill((AVPicture *)converted_frame,buffer,ffmpeg_pixfmt,codec_ctx->width,codec_ctx->height);
      const T foo = (T)0;
      AVPacket packet;
      for (unsigned int frame = 0, next_frame = nfirst_frame; frame<=nlast_frame && av_read_frame(format_ctx,&packet)>=0; ) {
        if (packet.stream_index==(int)vstream) {
          int decoded = 0;
#if defined(AV_VERSION_INT)
#if LIBAVCODEC_VERSION_INT<AV_VERSION_INT(52,26,0)
          avcodec_decode_video(codec_ctx,avframe,&decoded,packet.data, packet.size);
#else
          avcodec_decode_video2(codec_ctx,avframe,&decoded,&packet);
#endif
#else
          avcodec_decode_video(codec_ctx,avframe,&decoded,packet.data, packet.size);
#endif
          if (decoded) {
            if (frame==next_frame) {
              SwsContext *c = sws_getContext(codec_ctx->width,codec_ctx->height,codec_ctx->pix_fmt,codec_ctx->width,
                                             codec_ctx->height,ffmpeg_pixfmt,1,0,0,0);
              sws_scale(c,avframe->data,avframe->linesize,0,codec_ctx->height,converted_frame->data,converted_frame->linesize);
              if (ffmpeg_pixfmt==PIX_FMT_RGB24) {
                CImg<ucharT> next_image(*converted_frame->data,3,codec_ctx->width,codec_ctx->height,1,true);
                next_image._get_permute_axes("yzcx",foo).move_to(*this);
              } else {
                CImg<ucharT> next_image(*converted_frame->data,1,codec_ctx->width,codec_ctx->height,1,true);
                next_image._get_permute_axes("yzcx",foo).move_to(*this);
              }
              next_frame+=nstep_frame;
            }
            ++frame;
          }
          av_free_packet(&packet);
          if (next_frame>nlast_frame) break;
        }
      }
      delete[] buffer;
#endif
      return *this;
    }

    static CImgList<T> get_load_ffmpeg(const char *const filename, const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                       const unsigned int step_frame=1, const bool pixel_format=true) {
      return CImgList<T>().load_ffmpeg(filename,first_frame,last_frame,step_frame,pixel_format);
    }

    //! Load an image from a video file (MPEG,AVI) using the external tool 'ffmpeg'.
    CImgList<T>& load_ffmpeg_external(const char *const filename) {
      if (!filename)
        throw CImgArgumentException(_cimglist_instance
                                    "load_ffmpeg_external() : Specified filename is (null).",
                                    cimglist_instance);

      char command[1024] = { 0 }, filetmp[512] = { 0 }, filetmp2[512] = { 0 };
      std::FILE *file = 0;
      do {
        cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        cimg_snprintf(filetmp2,sizeof(filetmp2),"%s_000001.ppm",filetmp);
        if ((file=std::fopen(filetmp2,"rb"))!=0) cimg::fclose(file);
      } while (file);
      cimg_snprintf(filetmp2,sizeof(filetmp2),"%s_%%6d.ppm",filetmp);
#if cimg_OS!=2
      cimg_snprintf(command,sizeof(command),"%s -i \"%s\" %s >/dev/null 2>&1",cimg::ffmpeg_path(),filename,filetmp2);
#else
      cimg_snprintf(command,sizeof(command),"\"%s -i \"%s\" %s\" >NUL 2>&1",cimg::ffmpeg_path(),filename,filetmp2);
#endif
      cimg::system(command,0);
      const unsigned int omode = cimg::exception_mode();
      cimg::exception_mode() = 0;
      assign();
      unsigned int i = 1;
      for (bool stopflag = false; !stopflag; ++i) {
        cimg_snprintf(filetmp2,sizeof(filetmp2),"%s_%.6u.ppm",filetmp,i);
        CImg<T> img;
        try { img.load_pnm(filetmp2); }
        catch (CImgException&) { stopflag = true; }
        if (img) { img.move_to(*this); std::remove(filetmp2); }
      }
      cimg::exception_mode() = omode;
      if (is_empty())
        throw CImgIOException(_cimglist_instance
                              "load_ffmpeg_external() : Failed to open file '%s' with external command 'ffmpeg'.",
                              cimglist_instance,
                              filename);
      return *this;
    }

    static CImgList<T> get_load_ffmpeg_external(const char *const filename) {
      return CImgList<T>().load_ffmpeg_external(filename);
    }

    //! Load a gzipped list, using external tool 'gunzip'.
    CImgList<T>& load_gzip_external(const char *const filename) {
      if (!filename)
        throw CImgIOException(_cimglist_instance
                              "load_gzip_external() : Specified filename is (null).",
                              cimglist_instance);

      char command[1024] = { 0 }, filetmp[512] = { 0 }, body[512] = { 0 };
      const char
        *ext = cimg::split_filename(filename,body),
        *ext2 = cimg::split_filename(body,0);
      std::FILE *file = 0;
      do {
        if (!cimg::strcasecmp(ext,"gz")) {
          if (*ext2) cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext2);
          else cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        } else {
          if (*ext) cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext);
          else cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        }
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);
      cimg_snprintf(command,sizeof(command),"%s -c \"%s\" > %s",cimg::gunzip_path(),filename,filetmp);
      cimg::system(command);
      if (!(file = std::fopen(filetmp,"rb"))) {
        cimg::fclose(cimg::fopen(filename,"r"));
        throw CImgIOException(_cimglist_instance
                              "load_gzip_external() : Failed to open file '%s'.",
                              cimglist_instance,
                              filename);

      } else cimg::fclose(file);
      load(filetmp);
      std::remove(filetmp);
      return *this;
    }

    static CImgList<T> get_load_gzip_external(const char *const filename) {
      return CImgList<T>().load_gzip_external(filename);
    }

    //! Load a 3d object from a .OFF file.
    template<typename tf, typename tc>
    CImgList<T>& load_off(const char *const filename,
                          CImgList<tf>& primitives, CImgList<tc>& colors) {
      return get_load_off(filename,primitives,colors).move_to(*this);
    }

    template<typename tf, typename tc>
      static CImgList<T> get_load_off(const char *const filename,
                                      CImgList<tf>& primitives, CImgList<tc>& colors) {
      return CImg<T>().load_off(filename,primitives,colors)<'x';
    }

    //! Load a TIFF file.
    CImgList<T>& load_tiff(const char *const filename,
                           const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                           const unsigned int step_frame=1) {
      const unsigned int
        nfirst_frame = first_frame<last_frame?first_frame:last_frame,
        nstep_frame = step_frame?step_frame:1;
      unsigned int nlast_frame = first_frame<last_frame?last_frame:first_frame;
#ifndef cimg_use_tiff
      if (nfirst_frame || nlast_frame!=~0U || nstep_frame!=1)
        throw CImgArgumentException(_cimglist_instance
                                    "load_tiff() : Unable to load sub-images from file '%s' unless libtiff is enabled.",
                                    cimglist_instance,
                                    filename);

      return assign(CImg<T>::get_load_tiff(filename));
#else
      TIFF *tif = TIFFOpen(filename,"r");
      if (tif) {
        unsigned int nb_images = 0;
        do ++nb_images; while (TIFFReadDirectory(tif));
        if (nfirst_frame>=nb_images || (nlast_frame!=~0U && nlast_frame>=nb_images))
          cimg::warn(_cimglist_instance
                     "load_tiff() : Invalid specified frame range is [%u,%u] (step %u) since file '%s' contains %u image(s).",
                     cimglist_instance,
                     nfirst_frame,nlast_frame,nstep_frame,filename,nb_images);

        if (nfirst_frame>=nb_images) return assign();
        if (nlast_frame>=nb_images) nlast_frame = nb_images-1;
        assign(1+(nlast_frame-nfirst_frame)/nstep_frame);
        TIFFSetDirectory(tif,0);
#if cimg_verbosity>=3
        TIFFSetWarningHandler(0);
        TIFFSetErrorHandler(0);
#endif
        cimglist_for(*this,l) _data[l]._load_tiff(tif,nfirst_frame + l*nstep_frame);
        TIFFClose(tif);
      } else throw CImgException(_cimglist_instance
                                 "load_tiff() : Failed to open file '%s'.",
                                 cimglist_instance,
                                 filename);
      return *this;
#endif
    }

    static CImgList<T> get_load_tiff(const char *const filename,
                                     const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                     const unsigned int step_frame=1) {
      return CImgList<T>().load_tiff(filename,first_frame,last_frame,step_frame);
    }

    //@}
    //----------------------------------
    //
    //! \name Data Output
    //@{
    //----------------------------------

    //! Print informations about the list on the standard output.
    const CImgList<T>& print(const char *const title=0, const bool display_stats=true) const {
      unsigned int msiz = 0;
      cimglist_for(*this,l) msiz+=_data[l].size();
      msiz*=sizeof(T);
      const unsigned int mdisp = msiz<8*1024?0:(msiz<8*1024*1024?1:2);
      char _title[64] = { 0 };
      if (!title) cimg_snprintf(_title,sizeof(_title),"CImgList<%s>",pixel_type());
      std::fprintf(cimg::output(),"%s: this = %p, size = %u [%u %s], data = (CImg<%s>*)%p",
                   title?title:_title,(void*)this,_width,
                   mdisp==0?msiz:(mdisp==1?(msiz>>10):(msiz>>20)),
                   mdisp==0?"b":(mdisp==1?"Kb":"Mb"),
                   pixel_type(),(void*)begin());
      if (_data) std::fprintf(cimg::output(),"..%p.\n",(void*)((char*)end()-1));
      else std::fprintf(cimg::output(),".\n");

      char tmp[16] = { 0 };
      cimglist_for(*this,ll) {
        cimg_snprintf(tmp,sizeof(tmp),"[%d]",ll);
        std::fprintf(cimg::output(),"  ");
        _data[ll].print(tmp,display_stats);
        if (ll==3 && _width>8) { ll = _width-5; std::fprintf(cimg::output(),"  ...\n"); }
      }
      std::fflush(cimg::output());
      return *this;
    }

    //! Display the current CImgList instance in an existing CImgDisplay window (by reference).
    /**
       This function displays the list images of the current CImgList instance into an existing CImgDisplay window.
       Images of the list are concatenated in a single temporarly image for visualization purposes.
       The function returns immediately.
       \param disp : reference to an existing CImgDisplay instance, where the current image list will be displayed.
       \param axis : specify the axis for image concatenation. Can be 'x','y','z' or 'c'.
       \param align : specify the alignment for image concatenation.
       \return A reference to the current CImgList instance is returned.
    **/
    const CImgList<T>& display(CImgDisplay &disp, const char axis='x', const float align=0) const {
      get_append(axis,align).display(disp);
      return *this;
    }

    //! Display the current CImgList instance in a new display window.
    /**
       This function opens a new window with a specific title and displays the list images of the current CImgList instance into it.
       Images of the list are concatenated in a single temporarly image for visualization purposes.
       The function returns when a key is pressed or the display window is closed by the user.
       \param title : specify the title of the opening display window.
       \param axis : specify the axis for image concatenation. Can be 'x','y','z' or 'c'.
       \param align : specify the alignment for image concatenation.
       \return A reference to the current CImgList instance is returned.
    **/
    const CImgList<T>& display(CImgDisplay &disp, const bool display_info,
                               const char axis='x', const float align=0) const {
      bool is_exit = false;
      return _display(disp,0,display_info,axis,align,0,true,is_exit);
    }

    //! Display the current CImgList instance in a new display window.
    const CImgList<T>& display(const char *const title=0, const bool display_info=true,
                               const char axis='x', const float align=0) const {
      CImgDisplay disp;
      bool is_exit = false;
      return _display(disp,title,display_info,axis,align,0,true,is_exit);
    }

    const CImgList<T>& _display(CImgDisplay &disp, const char *const title, const bool display_info,
                                const char axis, const float align,
                                const unsigned int orig, const bool is_first_call, bool &is_exit) const {
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "display() : Empty instance.",
                                    cimglist_instance);
      if (!disp) {
        if (axis=='x') {
          unsigned int sum_width = 0, max_height = 0;
          cimglist_for(*this,l) {
            const CImg<T> &img = _data[l];
            const unsigned int
              w = CImgDisplay::_fitscreen(img._width,img._height,img._depth,256,-85,false),
              h = CImgDisplay::_fitscreen(img._width,img._height,img._depth,256,-85,true);
            sum_width+=w;
            if (h>max_height) max_height = h;
          }
          disp.assign(cimg_fitscreen(sum_width,max_height,1),title?title:0,1);
        } else {
          unsigned int max_width = 0, sum_height = 0;
          cimglist_for(*this,l) {
            const CImg<T> &img = _data[l];
            const unsigned int
              w = CImgDisplay::_fitscreen(img._width,img._height,img._depth,256,-85,false),
              h = CImgDisplay::_fitscreen(img._width,img._height,img._depth,256,-85,true);
            if (w>max_width) max_width = w;
            sum_height+=h;
          }
          disp.assign(cimg_fitscreen(max_width,sum_height,1),title?title:0,1);
        }
        if (!title) disp.set_title("CImgList<%s> (%u)",pixel_type(),_width);
      } else if (title) disp.set_title("%s",title);
      const CImg<char> dtitle = CImg<char>::string(disp.title());
      if (display_info) print(disp.title());
      disp.show().flush();

      if (_width==1) {
        if (!is_first_call)
          disp.resize(cimg_fitscreen(_data[0]._width,_data[0]._height,_data[0]._depth),false).
            set_title("%s (%ux%ux%ux%u)",dtitle.data(),_data[0]._width,_data[0]._height,_data[0]._depth,_data[0]._spectrum);
        _data[0]._display(disp,0,false,!is_first_call);
        if (disp.key()) is_exit = true;
        disp.set_title("%s",dtitle.data());
      } else {
        bool disp_resize = !is_first_call;
        while (!disp.is_closed() && !is_exit) {
          const CImg<intT> s = _get_select(disp,0,true,axis,align,orig,disp_resize,!is_first_call,true);
          disp_resize = true;
          if (s[0]<0) { // No selections done.
            if (disp.button()&2) { disp.flush(); break; }
            is_exit = true;
          } else if (disp.wheel()) { // Zoom in/out.
            const int wheel = disp.wheel();
            disp.set_wheel();
            if (!is_first_call && wheel<0) break;
            if (wheel>0 && _width>=4) {
              const unsigned int
                delta = cimg::max(1U,(unsigned int)cimg::round(0.3*_width)),
                ind0 = (unsigned int)cimg::max(0,s[0] - (int)delta),
                ind1 = (unsigned int)cimg::min(width() - 1,s[0] + (int)delta);
              if ((ind0!=0 || ind1!=_width-1) && ind1 - ind0>=3) get_shared_images(ind0,ind1)._display(disp,0,false,axis,align,orig + ind0,false,is_exit);
            }
          } else if (s[0]!=0 || s[1]!=width()-1) get_shared_images(s[0],s[1])._display(disp,0,false,axis,align,orig+s[0],false,is_exit);
        }
      }
      return *this;
    }

    //! Save an image list into a file.
    /**
       Depending on the extension of the given filename, a file format is chosen for the output file.
    **/
    const CImgList<T>& save(const char *const filename, const int number=-1) const {
      if (!filename)
        throw CImgArgumentException(_cimglist_instance
                                    "save() : Specified filename is (null).",
                                    cimglist_instance);
      // Do not test for empty instances, since .cimg format is able to manage empty instances.
      const char *const ext = cimg::split_filename(filename);
      char nfilename[1024] = { 0 };
      const char *const fn = (number>=0)?cimg::number_filename(filename,number,6,nfilename):filename;
#ifdef cimglist_save_plugin
      cimglist_save_plugin(fn);
#endif
#ifdef cimglist_save_plugin1
      cimglist_save_plugin1(fn);
#endif
#ifdef cimglist_save_plugin2
      cimglist_save_plugin2(fn);
#endif
#ifdef cimglist_save_plugin3
      cimglist_save_plugin3(fn);
#endif
#ifdef cimglist_save_plugin4
      cimglist_save_plugin4(fn);
#endif
#ifdef cimglist_save_plugin5
      cimglist_save_plugin5(fn);
#endif
#ifdef cimglist_save_plugin6
      cimglist_save_plugin6(fn);
#endif
#ifdef cimglist_save_plugin7
      cimglist_save_plugin7(fn);
#endif
#ifdef cimglist_save_plugin8
      cimglist_save_plugin8(fn);
#endif
      if (!cimg::strcasecmp(ext,"cimgz")) return save_cimg(fn,true);
      else if (!cimg::strcasecmp(ext,"cimg") || !*ext) return save_cimg(fn,false);
      else if (!cimg::strcasecmp(ext,"yuv")) return save_yuv(fn,true);
      else if (!cimg::strcasecmp(ext,"avi") ||
               !cimg::strcasecmp(ext,"mov") ||
               !cimg::strcasecmp(ext,"asf") ||
               !cimg::strcasecmp(ext,"divx") ||
               !cimg::strcasecmp(ext,"flv") ||
               !cimg::strcasecmp(ext,"mpg") ||
               !cimg::strcasecmp(ext,"m1v") ||
               !cimg::strcasecmp(ext,"m2v") ||
               !cimg::strcasecmp(ext,"m4v") ||
               !cimg::strcasecmp(ext,"mjp") ||
               !cimg::strcasecmp(ext,"mkv") ||
               !cimg::strcasecmp(ext,"mpe") ||
               !cimg::strcasecmp(ext,"movie") ||
               !cimg::strcasecmp(ext,"ogm") ||
               !cimg::strcasecmp(ext,"ogg") ||
               !cimg::strcasecmp(ext,"qt") ||
               !cimg::strcasecmp(ext,"rm") ||
               !cimg::strcasecmp(ext,"vob") ||
               !cimg::strcasecmp(ext,"wmv") ||
               !cimg::strcasecmp(ext,"xvid") ||
               !cimg::strcasecmp(ext,"mpeg")) return save_ffmpeg(fn);
#ifdef cimg_use_tiff
      else if (!cimg::strcasecmp(ext,"tif") ||
          !cimg::strcasecmp(ext,"tiff")) return save_tiff(fn);
#endif
      else if (!cimg::strcasecmp(ext,"gz")) return save_gzip_external(fn);
      else { if (_width==1) _data[0].save(fn,-1); else cimglist_for(*this,l) _data[l].save(fn,l); }
      return *this;
    }

    // Tell if a CImgList can be saved as one single file.
    static bool is_saveable(const char *const filename) {
      const char *const ext = cimg::split_filename(filename);
      if (!cimg::strcasecmp(ext,"cimgz") ||
#ifdef cimg_use_tiff
          !cimg::strcasecmp(ext,"tif") ||
          !cimg::strcasecmp(ext,"tiff") ||
#endif
          !cimg::strcasecmp(ext,"yuv") ||
          !cimg::strcasecmp(ext,"avi") ||
          !cimg::strcasecmp(ext,"mov") ||
          !cimg::strcasecmp(ext,"asf") ||
          !cimg::strcasecmp(ext,"divx") ||
          !cimg::strcasecmp(ext,"flv") ||
          !cimg::strcasecmp(ext,"mpg") ||
          !cimg::strcasecmp(ext,"m1v") ||
          !cimg::strcasecmp(ext,"m2v") ||
          !cimg::strcasecmp(ext,"m4v") ||
          !cimg::strcasecmp(ext,"mjp") ||
          !cimg::strcasecmp(ext,"mkv") ||
          !cimg::strcasecmp(ext,"mpe") ||
          !cimg::strcasecmp(ext,"movie") ||
          !cimg::strcasecmp(ext,"ogm") ||
          !cimg::strcasecmp(ext,"ogg") ||
          !cimg::strcasecmp(ext,"qt") ||
          !cimg::strcasecmp(ext,"rm") ||
          !cimg::strcasecmp(ext,"vob") ||
          !cimg::strcasecmp(ext,"wmv") ||
          !cimg::strcasecmp(ext,"xvid") ||
          !cimg::strcasecmp(ext,"mpeg")) return true;
      return false;
    }

    //! Save an image sequence, using FFMPEG library.
    // This piece of code has been originally written by David. G. Starkweather.
    const CImgList<T>& save_ffmpeg(const char *const filename, const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                   const unsigned int fps=25, const unsigned int bitrate=2048) const {
      if (!filename)
        throw CImgArgumentException(_cimglist_instance
                                    "save_ffmpeg() : Specified filename is (null).",
                                    cimglist_instance);
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "save_ffmpeg() : Empty instance, for file '%s'.",
                                    cimglist_instance,
                                    filename);
      if (!fps)
        throw CImgArgumentException(_cimglist_instance
                                    "save_ffmpeg() : Invalid specified framerate 0, for file '%s'.",
                                    cimglist_instance,
                                    filename);

      const unsigned int nlast_frame = last_frame==~0U?_width-1:last_frame;
      if (first_frame>=_width || nlast_frame>=_width)
        throw CImgArgumentException(_cimglist_instance
                                    "save_ffmpeg() : Out of range specified frames [%u,%u], for file '%s'.",
                                    cimglist_instance,
                                    first_frame,last_frame,filename);

      for (unsigned int ll = first_frame; ll<=nlast_frame; ++ll) if (!_data[ll].is_sameXYZ(_data[0]))
        throw CImgInstanceException(_cimglist_instance
                                    "save_ffmpeg() : Invalid instance dimensions, for file '%s'.",
                                    cimglist_instance,
                                    filename);

#ifndef cimg_use_ffmpeg
      return save_ffmpeg_external(filename,first_frame,last_frame,"mpeg2video",fps,bitrate);
#else
      avcodec_register_all();
      av_register_all();
      const int
        frame_dimx = _data[first_frame].width(),
        frame_dimy = _data[first_frame].height(),
        frame_dimv = _data[first_frame].spectrum();
      if (frame_dimv!=1 && frame_dimv!=3)
        throw CImgInstanceException(_cimglist_instance
                                    "save_ffmpeg() : Image[0] (%u,%u,%u,%u,%p) has not 1 or 3 channels, for file '%s'.",
                                    cimglist_instance,
                                    _data[0]._width,_data[0]._height,_data[0]._depth,_data[0]._spectrum,_data,filename);

      PixelFormat dest_pxl_fmt = PIX_FMT_YUV420P;
      PixelFormat src_pxl_fmt  = (frame_dimv==3)?PIX_FMT_RGB24:PIX_FMT_GRAY8;

      int sws_flags = SWS_FAST_BILINEAR; // Interpolation method (keeping same size images for now).
      AVOutputFormat *fmt = 0;
#if defined(AV_VERSION_INT)
#if LIBAVFORMAT_VERSION_INT<AV_VERSION_INT(52,45,0)
      fmt = guess_format(0,filename,0);
      if (!fmt) fmt = guess_format("mpeg",0,0); // Default format "mpeg".
#else
      fmt = av_guess_format(0,filename,0);
      if (!fmt) fmt = av_guess_format("mpeg",0,0); // Default format "mpeg".
#endif
#else
      fmt = guess_format(0,filename,0);
      if (!fmt) fmt = guess_format("mpeg",0,0); // Default format "mpeg".
#endif

      if (!fmt)
        throw CImgArgumentException(_cimglist_instance
                                    "save_ffmpeg() : Unable to determine codec for file '%s'.",
                                    cimglist_instance,
                                    filename);

      AVFormatContext *oc = 0;
#if defined(AV_VERSION_INT)
#if LIBAVFORMAT_VERSION_INT<AV_VERSION_INT(52,36,0)
      oc = av_alloc_format_context();
#else
      oc = avformat_alloc_context();
#endif
#else
      oc = av_alloc_format_context();
#endif
      if (!oc) // Failed to allocate format context.
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to allocate FFMPEG structure for format context, for file '%s'.",
                              cimglist_instance,
                              filename);

      AVCodec *codec = 0;
      AVFrame *picture = 0;
      AVFrame *tmp_pict = 0;
      oc->oformat = fmt;
      std::sprintf(oc->filename,"%s",filename);

      // Add video stream.
      int stream_index = 0;
      AVStream *video_str = 0;
      if (fmt->video_codec!=CODEC_ID_NONE) {
        video_str = av_new_stream(oc,stream_index);
        if (!video_str) { // Failed to allocate stream.
          av_free(oc);
          throw CImgIOException(_cimglist_instance
                                "save_ffmpeg() : Failed to allocate FFMPEG structure for video stream, for file '%s'.",
                                cimglist_instance,
                                filename);
        }
      } else { // No codec identified.
        av_free(oc);
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to identify proper codec, for file '%s'.",
                              cimglist_instance,
                              filename);
      }

      AVCodecContext *c = video_str->codec;
      c->codec_id = fmt->video_codec;
      c->codec_type = CODEC_TYPE_VIDEO;
      c->bit_rate = 1024*bitrate;
      c->width = frame_dimx;
      c->height = frame_dimy;
      c->time_base.num = 1;
      c->time_base.den = fps;
      c->gop_size = 12;
      c->pix_fmt = dest_pxl_fmt;
      if (c->codec_id==CODEC_ID_MPEG2VIDEO) c->max_b_frames = 2;
      if (c->codec_id==CODEC_ID_MPEG1VIDEO) c->mb_decision = 2;

      if (av_set_parameters(oc,0)<0) { // Parameters not properly set.
        av_free(oc);
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Invalid parameters set for avcodec, for file '%s'.",
                              cimglist_instance,
                              filename);
      }

      // Open codecs and alloc buffers.
      codec = avcodec_find_encoder(c->codec_id);
      if (!codec) { // Failed to find codec.
        av_free(oc);
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : No valid codec found for file '%s'.",
                              cimglist_instance,
                              filename);
      }
      if (avcodec_open(c,codec)<0) // Failed to open codec.
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to open codec for file '%s'.",
                              cimglist_instance,
                              filename);

      tmp_pict = avcodec_alloc_frame();
      if (!tmp_pict) { // Failed to allocate memory for tmp_pict frame.
        avcodec_close(video_str->codec);
        av_free(oc);
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to allocate memory for file '%s'.",
                              cimglist_instance,
                              filename);
      }
      tmp_pict->linesize[0] = (src_pxl_fmt==PIX_FMT_RGB24)?3*frame_dimx:frame_dimx;
      tmp_pict->type = FF_BUFFER_TYPE_USER;
      int tmp_size = avpicture_get_size(src_pxl_fmt,frame_dimx,frame_dimy);
      uint8_t *tmp_buffer = (uint8_t*)av_malloc(tmp_size);
      if (!tmp_buffer) { // Failed to allocate memory for tmp buffer.
        av_free(tmp_pict);
        avcodec_close(video_str->codec);
        av_free(oc);
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to allocate memory for file '%s'.",
                              cimglist_instance,
                              filename);
      }

      // Associate buffer with tmp_pict.
      avpicture_fill((AVPicture*)tmp_pict,tmp_buffer,src_pxl_fmt,frame_dimx,frame_dimy);
      picture = avcodec_alloc_frame();
      if (!picture) { // Failed to allocate picture frame.
        av_free(tmp_pict->data[0]);
        av_free(tmp_pict);
        avcodec_close(video_str->codec);
        av_free(oc);
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to allocate memory for file '%s'.",
                              cimglist_instance,
                              filename);
      }

      int size = avpicture_get_size(c->pix_fmt,frame_dimx,frame_dimy);
      uint8_t *buffer = (uint8_t*)av_malloc(size);
      if (!buffer) { // Failed to allocate picture frame buffer.
        av_free(picture);
        av_free(tmp_pict->data[0]);
        av_free(tmp_pict);
        avcodec_close(video_str->codec);
        av_free(oc);
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to allocate memory for file '%s'.",
                              cimglist_instance,
                              filename);
      }

      // Associate the buffer with picture.
      avpicture_fill((AVPicture*)picture,buffer,c->pix_fmt,frame_dimx,frame_dimy);

      // Open file.
      if (!(fmt->flags&AVFMT_NOFILE)) {
        if (url_fopen(&oc->pb,filename,URL_WRONLY)<0)
          throw CImgIOException(_cimglist_instance
                                "save_ffmpeg() : Failed to open file '%s'.",
                                cimglist_instance,
                                filename);
      }

      if (av_write_header(oc)<0)
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to write header in file '%s'.",
                              cimglist_instance,
                              filename);

      double video_pts;
      SwsContext *img_convert_context = 0;
      img_convert_context = sws_getContext(frame_dimx,frame_dimy,src_pxl_fmt,
                                           c->width,c->height,c->pix_fmt,sws_flags,0,0,0);
      if (!img_convert_context) { // Failed to get swscale context.
        // if (!(fmt->flags & AVFMT_NOFILE)) url_fclose(&oc->pb);
        av_free(picture->data);
        av_free(picture);
        av_free(tmp_pict->data[0]);
        av_free(tmp_pict);
        avcodec_close(video_str->codec);
        av_free(oc);
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to get conversion context for file '%s'.",
                              cimglist_instance,
                              filename);
      }
      int ret = 0, out_size;
      uint8_t *video_outbuf = 0;
      int video_outbuf_size = 1000000;
      video_outbuf = (uint8_t*)av_malloc(video_outbuf_size);
      if (!video_outbuf) {
        // if (!(fmt->flags & AVFMT_NOFILE)) url_fclose(&oc->pb);
        av_free(picture->data);
        av_free(picture);
        av_free(tmp_pict->data[0]);
        av_free(tmp_pict);
        avcodec_close(video_str->codec);
        av_free(oc);
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to allocate memory, for file '%s'.",
                              cimglist_instance,
                              filename);
      }

      // Loop through each desired image in list.
      for (unsigned int i = first_frame; i<=nlast_frame; ++i) {
        CImg<uint8_t> currentIm = _data[i], red, green, blue, gray;
        if (src_pxl_fmt==PIX_FMT_RGB24) {
          red = currentIm.get_shared_channel(0);
          green = currentIm.get_shared_channel(1);
          blue = currentIm.get_shared_channel(2);
          cimg_forXY(currentIm,X,Y) { // Assign pizel values to data buffer in interlaced RGBRGB ... format.
            tmp_pict->data[0][Y*tmp_pict->linesize[0] + 3*X] = red(X,Y);
            tmp_pict->data[0][Y*tmp_pict->linesize[0] + 3*X + 1] = green(X,Y);
            tmp_pict->data[0][Y*tmp_pict->linesize[0] + 3*X + 2] = blue(X,Y);
          }
        } else {
          gray = currentIm.get_shared_channel(0);
          cimg_forXY(currentIm,X,Y) tmp_pict->data[0][Y*tmp_pict->linesize[0] + X] = gray(X,Y);
        }

        if (video_str) video_pts = (video_str->pts.val * video_str->time_base.num)/(video_str->time_base.den);
        else video_pts = 0.0;
        if (!video_str) break;
        if (sws_scale(img_convert_context,tmp_pict->data,tmp_pict->linesize,0,c->height,picture->data,picture->linesize)<0) break;
        out_size = avcodec_encode_video(c,video_outbuf,video_outbuf_size,picture);
        if (out_size>0) {
          AVPacket pkt;
          av_init_packet(&pkt);
          pkt.pts = av_rescale_q(c->coded_frame->pts,c->time_base,video_str->time_base);
          if (c->coded_frame->key_frame) pkt.flags|=PKT_FLAG_KEY;
          pkt.stream_index = video_str->index;
          pkt.data = video_outbuf;
          pkt.size = out_size;
          ret = av_write_frame(oc,&pkt);
        } else if (out_size<0) break;
        if (ret) break; // Error occured in writing frame.
      }

      // Close codec.
      if (video_str) {
        avcodec_close(video_str->codec);
        av_free(picture->data[0]);
        av_free(picture);
        av_free(tmp_pict->data[0]);
        av_free(tmp_pict);
      }
      if (av_write_trailer(oc)<0)
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg() : Failed to write trailer for file '%s'.",
                              cimglist_instance,
                              filename);

      av_freep(&oc->streams[stream_index]->codec);
      av_freep(&oc->streams[stream_index]);
      if (!(fmt->flags&AVFMT_NOFILE)) {
        /*if (url_fclose(oc->pb)<0)
          throw CImgIOException(_cimglist_instance
                                "save_ffmpeg() : File '%s', failed to close file.",
                                cimglist_instance,
                                filename);
        */
      }
      av_free(oc);
      av_free(video_outbuf);
#endif
      return *this;
    }

    // Save an image sequence into a YUV file (internal).
    const CImgList<T>& _save_yuv(std::FILE *const file, const char *const filename, const bool rgb2yuv) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimglist_instance
                                    "save_yuv() : Specified filename is (null).",
                                    cimglist_instance);
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "save_yuv() : Empty instance, for file '%s'.",
                                    cimglist_instance,
                                    filename?filename:"(FILE*)");

      if ((*this)[0].width()%2 || (*this)[0].height()%2)
        throw CImgInstanceException(_cimglist_instance
                                    "save_yuv() : Invalid odd instance dimensions (%u,%u) for file '%s'.",
                                    cimglist_instance,
                                    (*this)[0].width(),(*this)[0].height(),
                                    filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      cimglist_for(*this,l) {
        CImg<ucharT> YCbCr((*this)[l]);
        if (rgb2yuv) YCbCr.RGBtoYCbCr();
        cimg::fwrite(YCbCr._data,YCbCr._width*YCbCr._height,nfile);
        cimg::fwrite(YCbCr.get_resize(YCbCr._width/2, YCbCr._height/2,1,3,3).data(0,0,0,1),
                     YCbCr._width*YCbCr._height/2,nfile);
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save an image sequence into a YUV file.
    const CImgList<T>& save_yuv(const char *const filename=0, const bool rgb2yuv=true) const {
      return _save_yuv(0,filename,rgb2yuv);
    }

    //! Save an image sequence into a YUV file.
    const CImgList<T>& save_yuv(std::FILE *const file, const bool rgb2yuv=true) const {
      return _save_yuv(file,0,rgb2yuv);
    }

    //! Save an image list into a .cimg file.
    /**
       A CImg RAW file is a simple uncompressed binary file that may be used to save list of CImg<T> images.
       \param filename : name of the output file.
       \return A reference to the current CImgList instance is returned.
    **/
    const CImgList<T>& _save_cimg(std::FILE *const file, const char *const filename, const bool compression) const {
      if (!file && !filename)
        throw CImgArgumentException(_cimglist_instance
                                    "save_cimg() : Specified filename is (null).",
                                    cimglist_instance);
#ifndef cimg_use_zlib
      if (compression)
        cimg::warn(_cimglist_instance
                   "save_cimg() : Unable to save compressed data in file '%s' unless zlib is enabled, saving them uncompressed.",
                   cimglist_instance,
                   filename?filename:"(FILE*)");
#endif
      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      const char *const ptype = pixel_type(), *const etype = cimg::endianness()?"big":"little";
      if (std::strstr(ptype,"unsigned")==ptype) std::fprintf(nfile,"%u unsigned_%s %s_endian\n",_width,ptype+9,etype);
      else std::fprintf(nfile,"%u %s %s_endian\n",_width,ptype,etype);
      cimglist_for(*this,l) {
        const CImg<T>& img = _data[l];
        std::fprintf(nfile,"%u %u %u %u",img._width,img._height,img._depth,img._spectrum);
        if (img._data) {
          CImg<T> tmp;
          if (cimg::endianness()) { tmp = img; cimg::invert_endianness(tmp._data,tmp.size()); }
          const CImg<T>& ref = cimg::endianness()?tmp:img;
          bool compressed = false;
          if (compression) {
#ifdef cimg_use_zlib
            const unsigned long siz = sizeof(T)*ref.size();
            unsigned long csiz = siz + siz/100 + 16;
            Bytef *const cbuf = new Bytef[csiz];
            if (compress(cbuf,&csiz,(Bytef*)ref._data,siz)) {
              cimg::warn(_cimglist_instance
                         "save_cimg() : Failed to save compressed data for file '%s', saving them uncompressed.",
                         cimglist_instance,
                         filename?filename:"(FILE*)");

              compressed = false;
            } else {
              std::fprintf(nfile," #%lu\n",csiz);
              cimg::fwrite(cbuf,csiz,nfile);
              delete[] cbuf;
              compressed = true;
            }
#else
            compressed = false;
#endif
          }
          if (!compressed) {
            std::fputc('\n',nfile);
            cimg::fwrite(ref._data,ref.size(),nfile);
          }
        } else std::fputc('\n',nfile);
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Save an image list into a CImg file (RAW binary file + simple header)
    const CImgList<T>& save_cimg(std::FILE *file, const bool compress=false) const {
      return _save_cimg(file,0,compress);
    }

    //! Save an image list into a CImg file (RAW binary file + simple header)
    const CImgList<T>& save_cimg(const char *const filename, const bool compress=false) const {
      return _save_cimg(0,filename,compress);
    }

    // Insert the instance image into into an existing .cimg file, at specified coordinates.
    const CImgList<T>& _save_cimg(std::FILE *const file, const char *const filename,
                                 const unsigned int n0,
                                 const unsigned int x0, const unsigned int y0,
                                 const unsigned int z0, const unsigned int c0) const {
#define _cimg_save_cimg_case(Ts,Tss) \
      if (!saved && !cimg::strcasecmp(Ts,str_pixeltype)) { \
        for (unsigned int l = 0; l<lmax; ++l) { \
          j = 0; while((i=std::fgetc(nfile))!='\n') tmp[j++]=(char)i; tmp[j] = 0; \
          W = H = D = C = 0; \
          if (std::sscanf(tmp,"%u %u %u %u",&W,&H,&D,&C)!=4) \
            throw CImgIOException(_cimglist_instance \
                                  "save_cimg() : Invalid size (%u,%u,%u,%u) of image[%u], for file '%s'.", \
                                  cimglist_instance, \
                                  W,H,D,C,l,filename?filename:"(FILE*)"); \
          if (W*H*D*C>0) { \
            if (l<n0 || x0>=W || y0>=H || z0>=D || c0>=D) std::fseek(nfile,W*H*D*C*sizeof(Tss),SEEK_CUR); \
            else { \
              const CImg<T>& img = (*this)[l - n0]; \
              const T *ptrs = img._data; \
              const unsigned int \
                x1 = x0 + img._width - 1, \
                y1 = y0 + img._height - 1, \
                z1 = z0 + img._depth - 1, \
                c1 = c0 + img._spectrum - 1, \
                nx1 = x1>=W?W-1:x1, \
                ny1 = y1>=H?H-1:y1, \
                nz1 = z1>=D?D-1:z1, \
                nc1 = c1>=C?C-1:c1; \
              CImg<Tss> raw(1+nx1-x0); \
              const unsigned int skipvb = c0*W*H*D*sizeof(Tss); \
              if (skipvb) std::fseek(nfile,skipvb,SEEK_CUR); \
              for (unsigned int v = 1 + nc1 - c0; v; --v) { \
                const unsigned int skipzb = z0*W*H*sizeof(Tss); \
                if (skipzb) std::fseek(nfile,skipzb,SEEK_CUR); \
                for (unsigned int z = 1 + nz1 - z0; z; --z) { \
                  const unsigned int skipyb = y0*W*sizeof(Tss); \
                  if (skipyb) std::fseek(nfile,skipyb,SEEK_CUR); \
                  for (unsigned int y = 1 + ny1 - y0; y; --y) { \
                    const unsigned int skipxb = x0*sizeof(Tss); \
                    if (skipxb) std::fseek(nfile,skipxb,SEEK_CUR); \
                    raw.assign(ptrs, raw._width); \
                    ptrs+=img._width; \
                    if (endian) cimg::invert_endianness(raw._data,raw._width); \
                    cimg::fwrite(raw._data,raw._width,nfile); \
                    const unsigned int skipxe = (W - 1 - nx1)*sizeof(Tss); \
                    if (skipxe) std::fseek(nfile,skipxe,SEEK_CUR); \
                  } \
                  const unsigned int skipye = (H - 1 - ny1)*W*sizeof(Tss); \
                  if (skipye) std::fseek(nfile,skipye,SEEK_CUR); \
                } \
                const unsigned int skipze = (D - 1 - nz1)*W*H*sizeof(Tss); \
                if (skipze) std::fseek(nfile,skipze,SEEK_CUR); \
              } \
              const unsigned int skipve = (C - 1 - nc1)*W*H*D*sizeof(Tss); \
              if (skipve) std::fseek(nfile,skipve,SEEK_CUR); \
            } \
          } \
        } \
        saved = true; \
      }

      if (!file && !filename)
        throw CImgArgumentException(_cimglist_instance
                                    "save_cimg() : Specified filename is (null).",
                                    cimglist_instance);
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "save_cimg() : Empty instance, for file '%s'.",
                                    cimglist_instance,
                                    filename?filename:"(FILE*)");

      std::FILE *const nfile = file?file:cimg::fopen(filename,"rb+");
      bool saved = false, endian = cimg::endianness();
      char tmp[256] = { 0 }, str_pixeltype[256] = { 0 }, str_endian[256] = { 0 };
      unsigned int j, err, N, W, H, D, C;
      int i;
      j = 0; while((i=std::fgetc(nfile))!='\n' && i!=EOF && j<256) tmp[j++] = (char)i; tmp[j] = 0;
      err = std::sscanf(tmp,"%u%*c%255[A-Za-z_]%*c%255[sA-Za-z_ ]",&N,str_pixeltype,str_endian);
      if (err<2) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimglist_instance
                              "save_cimg() : CImg header not found in file '%s'.",
                              cimglist_instance,
                              filename?filename:"(FILE*)");
      }
      if (!cimg::strncasecmp("little",str_endian,6)) endian = false;
      else if (!cimg::strncasecmp("big",str_endian,3)) endian = true;
      const unsigned int lmax = cimg::min(N,n0+_width);
      _cimg_save_cimg_case("bool",bool);
      _cimg_save_cimg_case("unsigned_char",unsigned char);
      _cimg_save_cimg_case("uchar",unsigned char);
      _cimg_save_cimg_case("char",char);
      _cimg_save_cimg_case("unsigned_short",unsigned short);
      _cimg_save_cimg_case("ushort",unsigned short);
      _cimg_save_cimg_case("short",short);
      _cimg_save_cimg_case("unsigned_int",unsigned int);
      _cimg_save_cimg_case("uint",unsigned int);
      _cimg_save_cimg_case("int",int);
      _cimg_save_cimg_case("unsigned_long",unsigned long);
      _cimg_save_cimg_case("ulong",unsigned long);
      _cimg_save_cimg_case("long",long);
      _cimg_save_cimg_case("float",float);
      _cimg_save_cimg_case("double",double);
      if (!saved) {
        if (!file) cimg::fclose(nfile);
        throw CImgIOException(_cimglist_instance
                              "save_cimg() : Unsupported data type '%s' for file '%s'.",
                              cimglist_instance,
                              filename?filename:"(FILE*)",str_pixeltype);
      }
      if (!file) cimg::fclose(nfile);
      return *this;
    }

    //! Insert the instance image into into an existing .cimg file, at specified coordinates.
    const CImgList<T>& save_cimg(const char *const filename,
                                 const unsigned int n0,
                                 const unsigned int x0, const unsigned int y0,
                                 const unsigned int z0, const unsigned int c0) const {
      return _save_cimg(0,filename,n0,x0,y0,z0,c0);
    }

    //! Insert the instance image into into an existing .cimg file, at specified coordinates.
    const CImgList<T>& save_cimg(std::FILE *const file,
                                 const unsigned int n0,
                                 const unsigned int x0, const unsigned int y0,
                                 const unsigned int z0, const unsigned int c0) const {
      return _save_cimg(file,0,n0,x0,y0,z0,c0);
    }

    // Create an empty .cimg file with specified dimensions (internal)
    static void _save_empty_cimg(std::FILE *const file, const char *const filename,
                                const unsigned int nb,
                                const unsigned int dx, const unsigned int dy,
                                const unsigned int dz, const unsigned int dc) {
      std::FILE *const nfile = file?file:cimg::fopen(filename,"wb");
      const unsigned int siz = dx*dy*dz*dc*sizeof(T);
      std::fprintf(nfile,"%u %s\n",nb,pixel_type());
      for (unsigned int i=nb; i; --i) {
        std::fprintf(nfile,"%u %u %u %u\n",dx,dy,dz,dc);
        for (unsigned int off=siz; off; --off) std::fputc(0,nfile);
      }
      if (!file) cimg::fclose(nfile);
    }

    //! Create an empty .cimg file with specified dimensions.
    static void save_empty_cimg(const char *const filename,
                                const unsigned int nb,
                                const unsigned int dx, const unsigned int dy=1,
                                const unsigned int dz=1, const unsigned int dc=1) {
      return _save_empty_cimg(0,filename,nb,dx,dy,dz,dc);
    }

    //! Create an empty .cimg file with specified dimensions.
    static void save_empty_cimg(std::FILE *const file,
                                const unsigned int nb,
                                const unsigned int dx, const unsigned int dy=1,
                                const unsigned int dz=1, const unsigned int dc=1) {
      return _save_empty_cimg(file,0,nb,dx,dy,dz,dc);
    }

    //! Save a file in TIFF format.
#ifdef cimg_use_tiff
    const CImgList<T>& save_tiff(const char *const filename, const unsigned int compression=0) const {
      if (!filename)
        throw CImgArgumentException(_cimglist_instance
                                    "save_tiff() : Specified filename is (null).",
                                    cimglist_instance);
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "save_tiff() : Empty instance, for file '%s'.",
                                    cimglist_instance,
                                    filename);

      TIFF *tif = TIFFOpen(filename,"w");
      if (tif) {
        for (unsigned int dir = 0, l = 0; l<_width; ++l) {
          const CImg<T>& img = (*this)[l];
          if (img) {
            if (img._depth==1) img._save_tiff(tif,dir++,compression);
            else cimg_forZ(img,z) img.get_slice(z)._save_tiff(tif,dir++,compression);
          }
        }
        TIFFClose(tif);
      } else
        throw CImgException(_cimglist_instance
                            "save_tiff() : Failed to open stream for file '%s'.",
                            cimglist_instance,
                            filename);
      return *this;
    }
#endif

    //! Save an image list as a gzipped file, using external tool 'gzip'.
    const CImgList<T>& save_gzip_external(const char *const filename) const {
      if (!filename)
        throw CImgIOException(_cimglist_instance
                              "save_gzip_external() : Specified filename is (null).",
                              cimglist_instance);

      char command[1024] = { 0 }, filetmp[512] = { 0 }, body[512] = { 0 };
      const char
        *ext = cimg::split_filename(filename,body),
        *ext2 = cimg::split_filename(body,0);
      std::FILE *file;
      do {
        if (!cimg::strcasecmp(ext,"gz")) {
          if (*ext2) cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext2);
          else cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.cimg",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        } else {
          if (*ext) cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand(),ext);
          else cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s.cimg",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        }
        if ((file=std::fopen(filetmp,"rb"))!=0) cimg::fclose(file);
      } while (file);

      if (is_saveable(body)) {
        save(filetmp);
        cimg_snprintf(command,sizeof(command),"%s -c %s > \"%s\"",cimg::gzip_path(),filetmp,filename);
        cimg::system(command);
        file = std::fopen(filename,"rb");
        if (!file)
          throw CImgIOException(_cimglist_instance
                                "save_gzip_external() : Failed to save file '%s' with external command 'gzip'.",
                                cimglist_instance,
                                filename);
        else cimg::fclose(file);
        std::remove(filetmp);
      } else {
        char nfilename[1024] = { 0 };
        cimglist_for(*this,l) {
          cimg::number_filename(body,l,6,nfilename);
          if (*ext) std::sprintf(nfilename + std::strlen(nfilename),".%s",ext);
          _data[l].save_gzip_external(nfilename);
        }
      }
      return *this;
    }

    //! Save an image sequence using the external tool 'ffmpeg'.
    const CImgList<T>& save_ffmpeg_external(const char *const filename, const unsigned int first_frame=0, const unsigned int last_frame=~0U,
                                            const char *const codec="mpeg2video", const unsigned int fps=25, const unsigned int bitrate=2048) const {
      if (!filename)
        throw CImgArgumentException(_cimglist_instance
                                    "save_ffmpeg_external() : Specified filename is (null).",
                                    cimglist_instance);
      if (is_empty())
        throw CImgInstanceException(_cimglist_instance
                                    "save_ffmpeg_external() : Empty instance, for file '%s'.",
                                    cimglist_instance,
                                    filename);

      char command[1024] = { 0 }, filetmp[512] = { 0 }, filetmp2[512] = { 0 };
      std::FILE *file = 0;
      const unsigned int nlast_frame = last_frame==~0U?_width-1:last_frame;
      if (first_frame>=_width || nlast_frame>=_width)
        throw CImgArgumentException(_cimglist_instance
                                    "save_ffmpeg_external() : Out of range specified frames [%u,%u] for file '%s'.",
                                    cimglist_instance,
                                    filename,first_frame,last_frame);

      for (unsigned int ll = first_frame; ll<=nlast_frame; ++ll) if (!_data[ll].is_sameXYZ(_data[0]))
        throw CImgInstanceException(_cimglist_instance
                                    "save_ffmpeg_external() : Invalid instance dimensions for file '%s'.",
                                    cimglist_instance,
                                    filename);
      do {
        cimg_snprintf(filetmp,sizeof(filetmp),"%s%c%s",cimg::temporary_path(),cimg_file_separator,cimg::filenamerand());
        cimg_snprintf(filetmp2,sizeof(filetmp2),"%s_000001.ppm",filetmp);
        if ((file=std::fopen(filetmp2,"rb"))!=0) cimg::fclose(file);
      } while (file);
      for (unsigned int l = first_frame; l<=nlast_frame; ++l) {
        cimg_snprintf(filetmp2,sizeof(filetmp2),"%s_%.6u.ppm",filetmp,l+1);
        if (_data[l]._depth>1 || _data[l]._spectrum!=3) _data[l].get_resize(-100,-100,1,3).save_pnm(filetmp2);
        else _data[l].save_pnm(filetmp2);
      }
#if cimg_OS!=2
      cimg_snprintf(command,sizeof(command),"ffmpeg -i %s_%%6d.ppm -vcodec %s -b %uk -r %u -y \"%s\" >/dev/null 2>&1",filetmp,codec,bitrate,fps,filename);
#else
      cimg_snprintf(command,sizeof(command),"\"ffmpeg -i %s_%%6d.ppm -vcodec %s -b %uk -r %u -y \"%s\"\" >NUL 2>&1",filetmp,codec,bitrate,fps,filename);
#endif
      cimg::system(command);
      file = std::fopen(filename,"rb");
      if (!file)
        throw CImgIOException(_cimglist_instance
                              "save_ffmpeg_external() : Failed to save file '%s' with external command 'ffmpeg'.",
                              cimglist_instance,
                              filename);
      else cimg::fclose(file);
      cimglist_for(*this,lll) { cimg_snprintf(filetmp2,sizeof(filetmp2),"%s_%.6u.ppm",filetmp,lll+1); std::remove(filetmp2); }
      return *this;
    }

    //@}
    //----------------------------------
    //
    //! \name Others
    //@{
    //----------------------------------

    //! Create an auto-cropped font (along the X axis) from a input font \p font.
    CImgList<T>& crop_font() {
      return get_crop_font().move_to(*this);
    }

    CImgList<T> get_crop_font() const {
      CImgList<T> res;
      cimglist_for(*this,l) {
        const CImg<T>& letter = (*this)[l];
        int xmin = letter._width, xmax = 0;
        cimg_forXY(letter,x,y) if (letter(x,y)) { if (x<xmin) xmin = x; if (x>xmax) xmax = x; }
        if (xmin>xmax) CImg<T>(letter._width,letter._height,1,letter._spectrum,0).move_to(res);
        else letter.get_crop(xmin,0,xmax,letter._height-1).move_to(res);
      }
      res[' '].resize(res['f']._width,-100,-100,-100,0);
      if (' '+256<res.size()) res[' '+256].resize(res['f']._width,-100,-100,-100,0);
      return res;
    }


    //! Return a CImg pre-defined font with desired size.
    /**
       \param font_height = height of the desired font (exact match for 11,13,17,19,24,32,38,57)
       \param fixed_size = tell if the font has a fixed or variable width.
    **/
    static const CImgList<T>& font(const unsigned int font_height, const bool variable_size=true) {

#define _cimg_font(sx,sy) \
      if (!variable_size && (!font || font[0]._height!=sy)) font = _font(cimg::font##sx##x##sy,sx,sy,false); \
      if (variable_size  && (!vfont || vfont[0]._height!=sy)) vfont = _font(cimg::font##sx##x##sy,sx,sy,true); \
      if (font_height==sy) return variable_size?vfont:font; \
      if (variable_size) { \
        if (cvfont && font_height==cvfont[0]._height) return cvfont; \
        cvfont = vfont; \
        cimglist_for(cvfont,l) \
          cvfont[l].resize(cimg::max(1U,cvfont[l]._width*font_height/cvfont[l]._height),font_height,-100,-100, \
                           cvfont[0]._height>font_height?2:5); \
        return cvfont; \
      } else { \
        if (cfont && font_height==cfont[0]._height) return cfont; \
        cfont = font; \
        cimglist_for(cfont,l) \
          cfont[l].resize(cimg::max(1U,cfont[l]._width*font_height/cfont[l]._height),font_height,-100,-100, \
                          cfont[0]._height>font_height?2:5); \
        return cfont; \
      } \

      static CImgList<T> font, vfont, cfont, cvfont;
      if (!font_height) return CImgList<T>::empty();
      if (font_height<=13) { _cimg_font(10,13); } // [1,13] -> ref 13
      if (font_height<=28) { _cimg_font(12,24); } // [14,28] -> ref 24
      if (font_height<=32) { _cimg_font(16,32); } // [29,32] -> ref 32
      _cimg_font(29,57);                          // [33,+inf] -> ref 57
    }

    static CImgList<T> _font(const unsigned int *const font, const unsigned int w, const unsigned int h, const bool variable_size) {
      CImgList<T> res(256,w,h,1,1);
      const unsigned int *ptr = font;
      unsigned int m = 0, val = 0;
      for (unsigned int y = 0; y<h; ++y)
        for (unsigned int x = 0; x<256*w; ++x) {
          m>>=1; if (!m) { m = 0x80000000; val = *(ptr++); }
          CImg<T>& img = res[x/w];
          unsigned int xm = x%w;
          img(xm,y) = (T)((val&m)?1:0);
        }
      if (variable_size) res.crop_font();
      return  res.insert(res);
    }

    //! Compute a 1-D Fast Fourier Transform, along specified axis.
    CImgList<T>& FFT(const char axis, const bool invert=false) {
      if (is_empty()) return *this;
      if (_width==1) insert(1);
      if (_width>2)
        cimg::warn(_cimglist_instance
                   "FFT() : Instance has more than 2 images",
                   cimglist_instance);

      CImg<T>::FFT(_data[0],_data[1],axis,invert);
      return *this;
    }

    CImgList<Tfloat> get_FFT(const char axis, const bool invert=false) const {
      return CImgList<Tfloat>(*this,false).FFT(axis,invert);
    }

    //! Compute a n-d Fast Fourier Transform.
    CImgList<T>& FFT(const bool invert=false) {
      if (is_empty()) return *this;
      if (_width==1) insert(1);
      if (_width>2)
        cimg::warn(_cimglist_instance
                   "FFT() : Instance has more than 2 images",
                   cimglist_instance);

      CImg<T>::FFT(_data[0],_data[1],invert);
      return *this;
    }

    CImgList<Tfloat> get_FFT(const bool invert=false) const {
      return CImgList<Tfloat>(*this,false).FFT(invert);
    }

    //! Invert primitives orientation of a 3d object.
    CImgList<T>& reverse_object3d() {
      cimglist_for(*this,l) {
        CImg<T>& p = _data[l];
        switch (p.size()) {
        case 2: case 3: cimg::swap(p[0],p[1]); break;
        case 6: cimg::swap(p[0],p[1],p[2],p[4],p[3],p[5]); break;
        case 9: cimg::swap(p[0],p[1],p[3],p[5],p[4],p[6]); break;
        case 4: cimg::swap(p[0],p[1],p[2],p[3]); break;
        case 12: cimg::swap(p[0],p[1],p[2],p[3],p[4],p[6],p[5],p[7],p[8],p[10],p[9],p[11]); break;
        }
      }
      return *this;
    }

    CImgList<T> get_reverse_object3d() const {
      return (+*this).reverse_object3d();
    }

    //@}
  };

  /*
  #---------------------------------------------
  #
   # Completion of previously declared functions
   #
   #----------------------------------------------
  */

namespace cimg {

  //! Display a dialog box, where a user can click standard buttons.
  /**
     Up to 6 buttons can be defined in the dialog window.
     This function returns when a user clicked one of the button or closed the dialog window.
     \param title = Title of the dialog window.
     \param msg = Main message displayed inside the dialog window.
     \param button1_label = Label of the 1st button.
     \param button2_label = Label of the 2nd button.
     \param button3_label = Label of the 3rd button.
     \param button4_label = Label of the 4th button.
     \param button5_label = Label of the 5th button.
     \param button6_label = Label of the 6th button.
     \param logo = Logo image displayed at the left of the main message. This parameter is optional.
     \param centering = Tell to center the dialog window on the screen.
     \return The button number (from 0 to 5), or -1 if the dialog window has been closed by the user.
     \note If a button text is set to 0, then the corresponding button (and the followings) won't appear in
     the dialog box. At least one button is necessary.
  **/
  template<typename t>
  inline int dialog(const char *const title, const char *const msg,
                    const char *const button1_label, const char *const button2_label,
                    const char *const button3_label, const char *const button4_label,
                    const char *const button5_label, const char *const button6_label,
                    const CImg<t>& logo, const bool centering = false) {
#if cimg_display==0
    cimg::unused(title,msg,button1_label,button2_label,button3_label,button4_label,button5_label,button6_label,logo._data,centering);
    throw CImgIOException("cimg::dialog() : No display available.");
#else
    const unsigned char
      black[] = { 0,0,0 }, white[] = { 255,255,255 }, gray[] = { 200,200,200 }, gray2[] = { 150,150,150 };

    // Create buttons and canvas graphics
    CImgList<unsigned char> buttons, cbuttons, sbuttons;
    if (button1_label) { CImg<unsigned char>().draw_text(0,0,button1_label,black,gray,1,13).move_to(buttons);
      if (button2_label) { CImg<unsigned char>().draw_text(0,0,button2_label,black,gray,1,13).move_to(buttons);
        if (button3_label) { CImg<unsigned char>().draw_text(0,0,button3_label,black,gray,1,13).move_to(buttons);
          if (button4_label) { CImg<unsigned char>().draw_text(0,0,button4_label,black,gray,1,13).move_to(buttons);
            if (button5_label) { CImg<unsigned char>().draw_text(0,0,button5_label,black,gray,1,13).move_to(buttons);
              if (button6_label) { CImg<unsigned char>().draw_text(0,0,button6_label,black,gray,1,13).move_to(buttons);
              }}}}}}
    if (!buttons._width)
      throw CImgArgumentException("cimg::dialog() : No buttons have been defined.");
    cimglist_for(buttons,l) buttons[l].resize(-100,-100,1,3);

    unsigned int bw = 0, bh = 0;
    cimglist_for(buttons,l) { bw = cimg::max(bw,buttons[l]._width); bh = cimg::max(bh,buttons[l]._height); }
    bw+=8; bh+=8;
    if (bw<64) bw = 64;
    if (bw>128) bw = 128;
    if (bh<24) bh = 24;
    if (bh>48) bh = 48;

    CImg<unsigned char> button(bw,bh,1,3);
    button.draw_rectangle(0,0,bw-1,bh-1,gray);
    button.draw_line(0,0,bw-1,0,white).draw_line(0,bh-1,0,0,white);
    button.draw_line(bw-1,0,bw-1,bh-1,black).draw_line(bw-1,bh-1,0,bh-1,black);
    button.draw_line(1,bh-2,bw-2,bh-2,gray2).draw_line(bw-2,bh-2,bw-2,1,gray2);
    CImg<unsigned char> sbutton(bw,bh,1,3);
    sbutton.draw_rectangle(0,0,bw-1,bh-1,gray);
    sbutton.draw_line(0,0,bw-1,0,black).draw_line(bw-1,0,bw-1,bh-1,black);
    sbutton.draw_line(bw-1,bh-1,0,bh-1,black).draw_line(0,bh-1,0,0,black);
    sbutton.draw_line(1,1,bw-2,1,white).draw_line(1,bh-2,1,1,white);
    sbutton.draw_line(bw-2,1,bw-2,bh-2,black).draw_line(bw-2,bh-2,1,bh-2,black);
    sbutton.draw_line(2,bh-3,bw-3,bh-3,gray2).draw_line(bw-3,bh-3,bw-3,2,gray2);
    sbutton.draw_line(4,4,bw-5,4,black,1,0xAAAAAAAA,true).draw_line(bw-5,4,bw-5,bh-5,black,1,0xAAAAAAAA,false);
    sbutton.draw_line(bw-5,bh-5,4,bh-5,black,1,0xAAAAAAAA,false).draw_line(4,bh-5,4,4,black,1,0xAAAAAAAA,false);
    CImg<unsigned char> cbutton(bw,bh,1,3);
    cbutton.draw_rectangle(0,0,bw-1,bh-1,black).draw_rectangle(1,1,bw-2,bh-2,gray2).draw_rectangle(2,2,bw-3,bh-3,gray);
    cbutton.draw_line(4,4,bw-5,4,black,1,0xAAAAAAAA,true).draw_line(bw-5,4,bw-5,bh-5,black,1,0xAAAAAAAA,false);
    cbutton.draw_line(bw-5,bh-5,4,bh-5,black,1,0xAAAAAAAA,false).draw_line(4,bh-5,4,4,black,1,0xAAAAAAAA,false);

    cimglist_for(buttons,ll) {
      CImg<unsigned char>(cbutton).draw_image(1+(bw-buttons[ll].width())/2,1+(bh-buttons[ll].height())/2,buttons[ll]).
        move_to(cbuttons);
      CImg<unsigned char>(sbutton).draw_image((bw-buttons[ll].width())/2,(bh-buttons[ll].height())/2,buttons[ll]).
        move_to(sbuttons);
      CImg<unsigned char>(button).draw_image((bw-buttons[ll].width())/2,(bh-buttons[ll].height())/2,buttons[ll]).
        move_to(buttons[ll]);
    }

    CImg<unsigned char> canvas;
    if (msg) CImg<unsigned char>().draw_text(0,0,"%s",black,gray,1,13,msg).resize(-100,-100,1,3).move_to(canvas);
    const unsigned int
      bwall = (buttons._width-1)*(12+bw) + bw,
      w = cimg::max(196U,36+logo._width+canvas._width,24+bwall),
      h = cimg::max(96U,36+canvas._height+bh,36+logo._height+bh),
      lx = 12 + (canvas._data?0:((w-24-logo._width)/2)),
      ly = (h-12-bh-logo._height)/2,
      tx = lx+logo._width+12,
      ty = (h-12-bh-canvas._height)/2,
      bx = (w-bwall)/2,
      by = h-12-bh;

    if (canvas._data)
      canvas = CImg<unsigned char>(w,h,1,3).
        draw_rectangle(0,0,w-1,h-1,gray).
        draw_line(0,0,w-1,0,white).draw_line(0,h-1,0,0,white).
        draw_line(w-1,0,w-1,h-1,black).draw_line(w-1,h-1,0,h-1,black).
        draw_image(tx,ty,canvas);
    else
      canvas = CImg<unsigned char>(w,h,1,3).
        draw_rectangle(0,0,w-1,h-1,gray).
        draw_line(0,0,w-1,0,white).draw_line(0,h-1,0,0,white).
        draw_line(w-1,0,w-1,h-1,black).draw_line(w-1,h-1,0,h-1,black);
    if (logo._data) canvas.draw_image(lx,ly,logo);

    unsigned int xbuttons[6] = { 0 };
    cimglist_for(buttons,lll) { xbuttons[lll] = bx+(bw+12)*lll; canvas.draw_image(xbuttons[lll],by,buttons[lll]); }

    // Open window and enter events loop
    CImgDisplay disp(canvas,title?title:" ",0,false,centering?true:false);
    if (centering) disp.move((CImgDisplay::screen_width() - disp.width())/2,
                             (CImgDisplay::screen_height() - disp.height())/2);
    bool stopflag = false, refresh = false;
    int oselected = -1, oclicked = -1, selected = -1, clicked = -1;
    while (!disp.is_closed() && !stopflag) {
      if (refresh) {
        if (clicked>=0) CImg<unsigned char>(canvas).draw_image(xbuttons[clicked],by,cbuttons[clicked]).display(disp);
        else {
          if (selected>=0) CImg<unsigned char>(canvas).draw_image(xbuttons[selected],by,sbuttons[selected]).display(disp);
          else canvas.display(disp);
        }
        refresh = false;
      }
      disp.wait(15);
      if (disp.is_resized()) disp.resize(disp,false);

      if (disp.button()&1)  {
        oclicked = clicked;
        clicked = -1;
        cimglist_for(buttons,l)
          if (disp.mouse_y()>=(int)by && disp.mouse_y()<(int)(by+bh) &&
              disp.mouse_x()>=(int)xbuttons[l] && disp.mouse_x()<(int)(xbuttons[l]+bw)) {
            clicked = selected = l;
            refresh = true;
          }
        if (clicked!=oclicked) refresh = true;
      } else if (clicked>=0) stopflag = true;

      if (disp.key()) {
        oselected = selected;
        switch (disp.key()) {
        case cimg::keyESC : selected=-1; stopflag=true; break;
        case cimg::keyENTER : if (selected<0) selected = 0; stopflag = true; break;
        case cimg::keyTAB :
        case cimg::keyARROWRIGHT :
        case cimg::keyARROWDOWN : selected = (selected+1)%buttons._width; break;
        case cimg::keyARROWLEFT :
        case cimg::keyARROWUP : selected = (selected+buttons._width-1)%buttons._width; break;
        }
        disp.set_key();
        if (selected!=oselected) refresh = true;
      }
    }
    if (!disp) selected = -1;
    return selected;
#endif
  }

  inline int dialog(const char *const title, const char *const msg,
                    const char *const button1_label, const char *const button2_label, const char *const button3_label,
                    const char *const button4_label, const char *const button5_label, const char *const button6_label,
                    const bool centering) {
    return dialog(title,msg,button1_label,button2_label,button3_label,button4_label,button5_label,button6_label,
                  CImg<unsigned char>::logo40x38(),centering);
  }

  //! Evaluate math expression.
  inline double eval(const char *const expression, const double x, const double y, const double z, const double c) {
    static const CImg<float> empty;
    return empty.eval(expression,x,y,z,c);
  }

  // End of cimg:: namespace
}

  // End of cimg_library:: namespace
}

#ifdef _cimg_redefine_None
#define None 0
#endif
#ifdef _cimg_redefine_min
#define min(a,b) (((a)<(b))?(a):(b))
#endif
#ifdef _cimg_redefine_max
#define max(a,b) (((a)>(b))?(a):(b))
#endif
#ifdef _cimg_redefine_PI
#define PI 3.141592653589793238462643383
#endif

#endif
// Local Variables:
// mode: c++
// End:
